Products

Industrial Valve Products

Complete range of industrial valves for every application.

16 products found

Ball Valves

Ball valves shut off flow with a quarter turn. That simplicity is the reason they outnumber every other valve type on a typical process plant—quick actuation, bidirectional sealing, and a wide-open bore that lets media pass with near-zero resistance when the valve is open. FLOWKS manufactures floating and trunnion-mounted configurations across 2" through 48" sizes, with cast and forged body options, top-entry access for welded-line maintenance, V-port trim for modulating duty, and multi-port designs for flow switching. The floating design relies on line pressure to push the ball against the downstream seat—self-reinforcing at higher pressures, economical at smaller sizes. Trunnion-mounted designs anchor the ball mechanically and let the seats move toward it—necessary above 8" where floating geometry can't maintain uniform seat loading, and essential for high-pressure Class 900–2500 service where the operating force would overwhelm a floating ball. Seat material selection—PTFE, Nylon, Delrin, PCTFE, reinforced PEEK—determines temperature limits and chemical compatibility. Metal-seated configurations handle abrasive, high-temperature, and cryogenic conditions where soft seats fail. Whether you need a compact 2" floating valve for a utility line or a 48" trunnion unit for a buried pipeline, the ball valve's quarter-turn simplicity scales across every size and pressure class in industrial service. FLOWKS ball valves cover the full industrial range—from 2" floating designs for utility and process isolation up through 48" trunnion-mounted units for high-pressure pipeline service. Floating ball valves (2"–8", Class 150–600) use line pressure to seat the ball against the downstream seat, delivering self-reinforcing shutoff at operating pressure. Trunnion-mounted ball valves (2"–48", Class 150–2500) anchor the ball with upper and lower stems, allowing spring-loaded or floating seats to seal against the ball—uniform contact pressure at every size, every pressure class. Cast steel bodies offer cost efficiency and smoother internal flow contours for viscous and slurry service. Forged steel bodies deliver higher structural integrity for demanding pressure containment. Top-entry designs enable in-line maintenance on buried and welded pipelines without removing the valve from the line. V-port ball valves combine shutoff with modulating control through characterised V-shaped ball openings. Multi-port configurations redirect flow between multiple process lines with a single valve body. Soft seat materials (PTFE, Nylon, Delrin, PCTFE, PEEK) cover general through high-performance chemical service. Metal seats handle abrasive, high-temperature, and cryogenic conditions. FLOWKS ball valves meet API 6D, API 608, and ASME B16.34 standards, with ISO 15848 low-emission certification available on trunnion and top-entry models.

DBB Valves

Double block and bleed valves give you two independent sealing boundaries with a verified vent cavity between them. That sounds redundant until you've stood next to a pressure gauge on a 1500-psi hydrocarbon line and watched a single isolation seat weep process fluid toward the instrument connection. One seat can leak. One seat can fail. DBB eliminates that risk by requiring both an upstream and a downstream seat to hold simultaneously, with the bleed cavity between them vented to atmosphere or closed drain so you can visually confirm both seats are sealing before opening the instrument side. FLOWKS manufactures gauge block, flange, trunnion, and needle-type DBB configurations—from compact 1/2" instrument isolation valves through full-bore pipeline DBB units. Gauge block DBBs mount directly at instrument taps with nonoflange or flanged connections. Flange and trunnion DBBs isolate pipeline sections for maintenance, inspection, and pressure verification. Sampling DBB needle valves add a sample port between the two blocking seats, allowing fluid extraction without breaking isolation. Every DBB configuration shares the same functional principle: two seats, one bleed, verified zero-pressure proof that both boundaries hold before you proceed. FLOWKS double block and bleed (DBB) valves provide verified dual isolation with a vented cavity between two independent seating boundaries. The upstream seat blocks process pressure; the downstream seat protects the instrument or downstream line; the bleed cavity between them vents to atmosphere or closed drain, giving visual confirmation that both seats are holding before any downstream work begins. Gauge block nonoflange DBB valves thread directly onto instrument taps—1/2" through 2", Class 150–1500, compact installation without flange bolting or gasket alignment. Gauge block SBB (single block and bleed) valves provide one blocking seat plus a bleed vent for applications where dual isolation isn't mandated. Flange DBB valves bolt into pipeline flanged connections for larger-diameter isolation. Trunnion DBB valves integrate the double block and bleed function into a trunnion-mounted ball valve body for full-bore pipeline service. Flange-to-screw needle-type DBB valves combine flanged process connections with threaded instrument connections, bridging between piping standards. Sampling DBB needle valves add a sample extraction port within the bleed cavity, allowing fluid collection without breaking either isolation boundary. FLOWKS DBB valves meet API 6D requirements for double isolation, with ISO 15848 fugitive emission certification available. Seat options include PTFE, PEEK, and metal-to-metal (Stellite 6) for chemical compatibility and temperature range matching.

Control Valves

Control valves don't just shut off flow—they modulate it. A ball valve opens or closes in a quarter turn; a control valve positions itself at 37%, 62%, or any point along the travel range to maintain the flow rate, pressure, temperature, or liquid level the process control loop demands. That continuous modulation is what separates throttling service from isolation service, and it dictates different trim geometry, different seat materials, different actuator response characteristics. FLOWKS manufactures linear stroke control valves with pneumatic and electric actuators for precise flow regulation across 1/2" through 12" sizes and Class 150–600 pressure ratings. V-ball control valves handle erosive, abrasive, and high-differential-pressure applications with characterised ball openings that combine shutoff capability with modulating control. Butterfly control valves—triple-offset designs—deliver tight shutoff plus throttling in large-diameter, low-pressure-drop service where linear stroke valves become impractical. Specialised configurations include self-actuated pressure regulators that operate without external power, fluorine-lined valves for concentrated acid service, bellows-sealed low-flow valves for toxic and fugitive-emission-sensitive applications, and labyrinth multi-stage pressure reduction trim that eliminates cavitation and flashing across extreme pressure drops. Every FLOWKS control valve starts with the process requirement—what media, what pressure drop, what flow characteristic, what emission standard—and builds the trim, body, and actuator configuration that matches. FLOWKS control valves provide precise flow regulation, pressure control, and process modulation for oil & gas, petrochemical, chemical, power generation, and water treatment applications. Linear stroke control valves—pneumatic or electric actuated—deliver accurate throttling across 1/2"–12" sizes, Class 150–600, with equal-percentage or linear flow characteristics matched to process loop dynamics. V-ball control valves combine shutoff and modulating control through characterised V-shaped ball openings, with wear-resistant trim options including ceramic, hard alloy, and TCC coated configurations for erosive and abrasive service. High performance triple-offset butterfly control valves offer tight shutoff plus throttling capability in large-diameter, low-pressure-drop applications. Self-actuated pressure regulating valves operate without external power—process pressure itself drives the actuation mechanism for simple, reliable pressure control. Fluorine-lined control valves handle concentrated acid and aggressive chemical media where metal trim would corrode. Low flow regulating valves—including bellows-sealed configurations—provide precise trace-quantity regulation for analytical, sampling, and fugitive-emission-critical service. Labyrinth multi-stage pressure reduction control valves eliminate cavitation and flashing across extreme differential pressure drops through staged energy dissipation within the trim. Flow regulating valves optimise water treatment and distribution system performance with low-pressure-loss disc designs. FLOWKS control valves meet IEC 60534, ISO 15848, and API 608 standards with multiple body materials and trim configurations for every process condition.

Alloy Valves

Standard stainless handles most process conditions. But when the media swings beyond what 316L can survive—hydrofluoric acid, concentrated sulfuric, hot wet chlorine, 98% nitric, seawater with biofouling pressure—standard materials pit, crack, dissolve, or fail within months. Alloy valves exist for that territory. FLOWKS manufactures valves in Hastelloy (C276/C22), Monel (400/K500), Incoloy 825, 904L, 254SMO (S31254), titanium (Grade 2/5/7), zirconium (R60702), aluminum bronze (C95400/C63000), pure nickel (N02200/N02201), and C4 steel (00Cr14Ni14Si4)—each alloy targeting a specific corrosion mechanism that stainless cannot address. Hastelloy covers both oxidizing and reducing acid swings. Monel resists fluoride and alkaline corrosion. Titanium's oxide film regenerates in chloride environments. Zirconium's ZrO2 layer survives concentrated nitric where even Hastelloy's oxide destabilizes. 254SMO's PREN 43+ makes it the pitting champion in seawater and FGD scrubbers. C4 steel's silicon oxide film handles transpassive nitric conditions that dissolve standard stainless oxide layers. Specifying alloy valves isn't about upgrading for prestige—it's about matching the material to the specific corrosion mechanism your process throws at it. Every alloy has weaknesses alongside its strengths: titanium fails in fluoride, Monel is vulnerable to oxidizing acids, C4 has no ASTM equivalent for Western projects. FLOWKS alloy valves are selected by corrosion engineers who know exactly what media the valve faces—not by procurement teams shopping for "better than stainless." FLOWKS alloy valves address process conditions where standard stainless steel and carbon steel cannot survive. Hastelloy C276 and C22 valves resist both oxidizing and reducing acid environments—flue gas desulfurization, HF alkylation, mixed-acid chemical processing. Monel 400 and K500 valves excel in fluoride-containing and alkaline service—HF alkylation circuits, caustic processing, seawater exposure. Titanium valves (Grade 2, Grade 5, Grade 7) leverage a self-regenerating oxide film for chloride, wet chlorine, and seawater applications where 316L pits rapidly. Zirconium valves (R60702) survive concentrated nitric acid service through a chemically stable ZrO2 surface film. 904L valves cover the full sulfuric acid concentration range with high-nickel, high-molybdenum chemistry. 254SMO (S31254) valves deliver PREN 43+ pitting resistance for seawater, FGD scrubbers, and high-chloride process streams. Incoloy 825 valves handle sour gas and multi-element corrosive conditions with coordinated nickel-chromium-molybdenum defense. Pure nickel valves (N02200/N02201) are the standard choice for caustic soda and high-purity alkali service. Aluminum bronze butterfly valves resist seawater biofouling and corrosion at lower cost than nickel-alloy alternatives. C4 steel (00Cr14Ni14Si4) valves survive 98%+ concentrated nitric acid through a silicon oxide film stable in transpassive conditions. FLOWKS alloy valves are available in gate, globe, ball, butterfly, check, and diaphragm configurations per the corrosion engineer's specification.

Knife Gate Valves

Knife gate valves cut through media that regular gate valves can't handle—fibrous pulp, settling slurries, tailings with suspended solids, sticky process residues that jam a parallel-seat gate before it reaches closed position. The blade-shaped gate slices through whatever sits in the flow path instead of trying to push it aside. That's the fundamental difference between a knife gate and a conventional wedge gate: one cuts, one wedges, and in media that accumulates on the seat surface, cutting wins. FLOWKS manufactures nine knife gate and slurry valve configurations—from lightweight wafer unidirectional isolation valves through heavy-duty long-pattern slurry valves, bidirectional dual-seat designs, polyurethane-lined abrasive service valves, and high-pressure units rated to Class 900. Wafer bodies fit between pipeline flanges with minimal footprint. Flanged bodies bolt directly into the line. One-piece ("whole unit") castings eliminate the body split gasket as a leak path. Bidirectional designs seat the gate from both directions with two independent sealing boundaries. Unidirectional designs seat in one direction only—cheaper, simpler, adequate for lines with known flow direction. Polyurethane lining shields every wetted surface from abrasive attack. High-pressure configurations use Stellite 6 metal seats and pressure seal bonnets for service beyond 50 bar. Every configuration shares the same operating principle: a sharp-edged gate that cuts through the media and seats against a peripheral seal, rather than wedging between two parallel faces that trap debris. FLOWKS knife gate valves and slurry valves provide reliable shutoff in media conditions that defeat conventional gate valves—pulp stock, mining slurries, tailings transport, wastewater with suspended solids, and sticky process residues. The blade-shaped gate slices through accumulated media rather than wedging it aside, preventing seat cavity blockage and ensuring full-bore shutoff even after prolonged service in settling or fibrous media. Wafer knife gate valves offer the lightest, most compact isolation option for Class 150 service—unidirectional sealing, minimal installation footprint, lowest cost per size. Bidirectional knife gate valves add dual-seat sealing for lines with pressure on both sides of the valve. High pressure knife gate valves extend service to Class 300–900 with metal seats and pressure seal bonnets. Polyurethane-lined knife gate valves protect all wetted surfaces from abrasive slurries with full-body PU liners that outlast hard rubber by 5–10x. Heavy-duty long-pattern slurry valves provide structural depth and full-port bore for demanding mining and mineral processing applications. Whole unit slurry valves use one-piece cast bodies to eliminate the body gasket leak path entirely. High pressure slurry valves combine abrasive media resistance with Class 300–900 pressure ratings and Stellite 6 metal seats. Unidirectional sealing knife gate valves deliver cost-effective single-direction isolation for lines with consistent flow direction. Manual, pneumatic, and hydraulic actuation options available across all configurations.

Butterfly Valves

Butterfly valves rotate a disc 90° inside the flow path to open or close—the simplest quarter-turn mechanism in industrial valve design. That simplicity is the reason butterfly valves dominate water, HVAC, and general process isolation: one moving part, one 90° stroke, one sealing interface, minimal space envelope, lowest cost per diameter inch of any shutoff valve type. FLOWKS manufactures eight butterfly valve configurations spanning three sealing philosophies and three body connection formats. Concentric (centerline) designs align the shaft, disc, and body on the same axis—the disc slides across the seat surface during rotation, simple and cheap but limited in pressure rating and cycle life. Double eccentric (high-performance) designs offset the shaft in two planes so the disc cam-lifts off the seat during opening, reducing rubbing and extending elastomer seat life by 3-5x. Triple eccentric designs offset the shaft in three planes so the disc only contacts the seat at the final 2-3° of closing—frictionless travel that enables metal-to-metal seating for high-temperature and fire-safe service. Seat types range from resilient elastomer liners (EPDM, NBR, Viton—bubble-tight, low-cost, temperature-limited) through metal seats (Stellite 6 overlay—fire-safe, high-temperature, slight ambient leakage) to multi-layer composite seats (metal base ring + flexible graphite layer—bubble-tight at ambient AND fire-safe under fire conditions). Body connections include wafer (sandwich between flanges, slimmest, cheapest), lug (threaded ears, one-side isolation capability), and butt-weld (permanent welded-in installation, zero external leak paths). Pneumatic, electric, hydraulic, and manual actuation options cover the full range of process automation requirements. FLOWKS butterfly valves provide quarter-turn shutoff across the widest range of process conditions—from HVAC water isolation at Class 150 to petrochemical high-pressure high-temperature service at Class 900. Concentric centerline butterfly valves with resilient elastomer liners deliver cost-effective bidirectional sealing for water, wastewater, and light-process applications. Double eccentric high-performance butterfly valves reduce seat friction through cam-action disc rotation, extending elastomer cycle life and enabling Class 150-300 service with tighter shutoff. Triple eccentric butterfly valves with metal-to-metal Stellite seats eliminate elastomer entirely—rated for 350°C+ continuous temperature, fire-safe per API 607, ISO 15848 low-leakage fugitive emission compliant. Multi-layer composite seats combine bubble-tight ambient sealing with fire-safe metal backup for petrochemical installations that demand both capabilities. Wafer bodies offer the slimmest installation footprint between pipeline flanges. Lug bodies enable dead-end service and one-side isolation through independent threaded flange ears. Butt-welded ends eliminate flange gaskets entirely for permanent high-pressure and buried installations. Forged body construction provides casting-free pressure boundary integrity for severe service at small sizes. Pneumatic, electric, hydraulic, and manual gear actuation available across all configurations.

Strainers & Filters

Strainers remove debris from process fluid before it reaches downstream equipment—pumps, control valves, heat exchangers, spray nozzles, instrumentation. Sight flow indicators let operators visually confirm process conditions—flow presence, flow direction, fluid clarity, entrained gas, reaction progress. These two product families serve different functions but share the same installation context: they sit in the pipeline as inline components, between the source and the sensitive downstream equipment that debris or unexpected process conditions would damage. FLOWKS manufactures five strainer configurations and two sight flow indicator configurations. Basket strainers use a cylindrical or basket-shaped screen inside a body cavity—debris collects inside the basket, clean fluid passes through to the outlet, top-cover access makes basket removal a five-minute job. Y-type strainers use a compact angled screen chamber branching off the main flow passage—smaller, lighter, rated to Class 1500 at small sizes, the default for steam, air, and small-bore process protection. Dual basket strainers add a diverter valve between two parallel chambers—switch flow from one to the other without shutting down the line. Duplex basket strainers upgrade the changeover to a four-port or six-port integral valve that simultaneously swaps inlet and outlet in one lever turn, with bleed/vent ports for safe offline maintenance. Temporary strainers are commissioning-only components—perforated cones or flat plates installed between pipeline flanges to catch construction debris during start-up, removed after the system is clean. Window-type sight glasses provide a borosilicate glass panel for visual observation—single or dual-window for backlit visibility. Flapper/ball-type sight flow indicators add an internal moving element that deflects with flow direction and velocity, giving visual confirmation of flow presence, direction, and relative rate in addition to fluid appearance. FLOWKS strainers and sight flow indicators protect downstream equipment and provide visual process verification across industrial piping systems. Basket strainers offer open-top screen access for fast debris removal—five-minute maintenance without pipeline disconnection, mesh sizes from coarse pump protection (1/8"–1/2" perforations) to fine instrument and nozzle protection (40–100 mesh wire). Y-type strainers deliver compact high-pressure screening in angled chambers—rated to Class 1500, ideal for steam, compressed air, hydraulic, and small-bore process lines from 1/2" to 12". Dual basket strainers enable continuous-flow straining with a diverter valve switching between two parallel chambers—zero downtime for basket cleaning on critical pump suction and cooling water lines. Duplex basket strainers upgrade the changeover to simultaneous inlet/outlet switching with integral four-port or six-port valve and bleed/vent ports for safe offline maintenance. Temporary cone and flat-plate strainers catch construction debris during commissioning, removed after clean-up cycle. Window-type sight glasses provide borosilicate glass panels for fluid visual inspection—single or dual-window with backlit visibility for dark or opaque media. Flapper and ball-type sight flow indicators add internal motion elements for visual confirmation of flow direction, presence, and relative velocity on small-diameter lines.

Plug Valves

Plug valves rotate a cylindrical or tapered plug 90° inside the body bore to open or close the flow passage. The plug itself is the sealing element—its outer surface contacts the body seat surface directly, or through an intermediate seat insert, to achieve shutoff. That direct plug-to-seat interface is the fundamental characteristic that distinguishes plug valves from ball valves (where a separate seat ring contacts the ball) and gate valves (where a flat gate slides between two seat rings). FLOWKS manufactures six plug valve configurations spanning three seating philosophies and three mechanical motion types. Lubricated plug valves inject sealant through external fittings into internal distribution grooves on the tapered plug surface—the lubricant film creates both the primary sealing boundary and the rotational lubrication layer that prevents metal galling. Soft seated plug valves use PTFE, reinforced PTFE, Viton, EPDM, or NBR inserts bonded to the body bore or plug surface—soft seat compression fills surface irregularities for bubble-tight zero leakage, no external lubricant needed. Pressure balanced plug valves route line pressure to both sides of the plug through internal bypass passages—hydraulic forces cancel out, operating torque stays manageable at Class 600-900 and 12"-24" sizes where unbalanced torque would exceed manual or actuator capability. Lift type plug valves raise the plug off the seat before rotating—zero sliding contact during rotation eliminates seat wear, limited to 1/2"-4" sizes where the lift distance is short. Expanding plug valves (Venturi) use expandable sealing elements (slips/wedges) that move outward against reduced-diameter body seat faces—double-block-and-bleed sealing in a single valve body, with some open-state pressure drop through the venturi constriction. Expanding plug valves (Full Bore) apply the same expanding mechanism against full-diameter seat faces—DBB sealing plus piggable unrestricted flow passage, at higher mechanical complexity and cost than the venturi design. FLOWKS plug valves provide quarter-turn shutoff through direct plug-to-body sealing contact across the widest range of pressure and seating requirements. Oil lubricated plug valves create a hydrostatic seal through injected lubricant film between tapered plug and body bore—specified for crude oil, natural gas, and refinery service where line media degrades elastomer seats. Soft seated plug valves achieve bubble-tight zero leakage through PTFE, reinforced PTFE, Viton, or EPDM seat inserts—no external lubricant, lower torque, ideal for chemical, water, and process isolation up to Class 300. Pressure balanced plug valves cancel hydraulic force on the plug face through internal bypass passages—manageable operating torque at Class 600-900 on 12" through 24" pipeline isolation where unbalanced torque exceeds actuator capability. Lift type plug valves raise the plug off the seat before rotation—zero sliding friction, zero seat wear, limited to 1/2"-4" sizes for instrument and sampling isolation. Expanding plug valves (Venturi) deliver double-block-and-bleed sealing in a single valve body through outward-expanding sealing elements against reduced-diameter seat faces—compact seat geometry, some open-state pressure drop. Expanding plug valves (Full Bore) provide DBB sealing plus piggable unrestricted flow passage through full-diameter expanding slips—zero open-state pressure drop, pigging-compatible, at higher mechanical complexity.

Special Valves

This series of Specialty Valves is a collection of customized professional valves designed for extreme, complex and hazardous working conditions that cannot be satisfied by conventional standard valves. It covers high temperature & high pressure, cryogenic low temperature, strong corrosion, severe abrasion, high vacuum, toxic & harmful, radioactive and oxygen-clean service, including bellows valves, fluorine-lined valves, high-pressure self-sealing valves, cryogenic valves, wear-resistant slag discharge valves, vacuum valves and nuclear-grade valves. Each series is precisely customized in structure and material according to working conditions: high-temperature & high-pressure valves adopt integral forging and pressure self-tightening seal to resist high-temperature creep and high-pressure impact; cryogenic valves are equipped with extended cold bonnet and low-temperature impact-resistant materials to avoid cold brittleness and freezing failure; corrosion-resistant valves adopt full fluorine lining, Hastelloy and titanium alloy to isolate acid, alkali, chlorine and organic solvents; wear-resistant valves adopt hard alloy overlay and ceramic lining to withstand particle slurry and dust erosion; hazardous medium valves achieve fugitive emission zero leakage and oil-free degreasing treatment for toxic, flammable, radioactive and pure oxygen service. All products comply with API, ASME, GB, HG, nuclear and air separation standards, passing liquid nitrogen immersion test, helium leak detection, high-temperature fatigue test and fire safety verification. Fully customizable in end connections (flanged, butt-weld, vacuum clamp) and actuators (manual, pneumatic, electric, hydraulic). Widely used in coal chemical, chlor-alkali, LNG energy storage, thermal power, nuclear power, aerospace air separation, hydrometallurgy and environmental protection desulfurization industries, serving as critical equipment for fluid isolation, throttling, diversion and safety protection under extreme working conditions.

Cryogenic Valves

Cryogenic valves operate in fluid service below -46°C (ASHRAE definition) and down to -196°C (liquid nitrogen, LNG boiling point). At these temperatures, three design problems that standard valves never face become critical: (1) packing failure — standard PTFE packing cracks and graphite packing loses resilience below -100°C, so the packing chamber must be kept at ambient temperature through an extended bonnet that adds enough stem length to move the packing gland above the frost line. (2) trapped liquid pressure lock — when a valve closes with cryogenic liquid trapped inside the body cavity, that liquid warms slowly through heat conduction, expands from liquid to gas, and the pressure spike can lock the closing element against the seats; vent holes through the ball (ball valves) or body cavity gas vents (gate valves) prevent this pressure lock. (3) seat material embrittlement — standard PTFE becomes brittle below -100°C and cracks under seating stress; PCTFE (Kel-F) and TFM retain flexibility and sealing integrity down to -196°C. FLOWKS manufactures eight cryogenic valve configurations covering ball, globe, butterfly, gate, and control valve types. Top entry cryogenic ball valves provide in-line service access through a top cover without pipeline removal. Two-piece cryogenic ball valves offer compact bodies at 1/2"-4" sizes where in-line serviceability is less critical. Butt weld cryogenic globe valves eliminate all flanged connections for zero flange leak risk on small-bore permanent installations. Cryogenic butterfly valves with inspection ports combine isolation and process monitoring in one body through a sealed access port for temperature/pressure sensing. Cryogenic control valves regulate flow with extended bonnets keeping actuators at ambient temperature and multi-stage trim preventing flash flow during cryogenic pressure letdown. Flanged forged steel cryogenic gate valves provide forged-body integrity at 2"-12" with flanged access for periodic maintenance. Cast-body cryogenic gate valves cover the full range 1/2"-24" at cost-effective cast pricing for general cryogenic isolation. Small-bore forged steel cryogenic gate valves deliver zero-porosity forged integrity at 1/2"-2" with socket weld/threaded connections for critical permanent isolation points. FLOWKS cryogenic valves provide isolation, regulation, and control for LNG, liquid nitrogen, liquid oxygen, liquid argon, and all process fluids operating below -46°C down to -196°C. Extended bonnet designs keep packing chambers above the frost line so standard packing materials function at ambient temperature while the valve body handles cryogenic fluid. PCTFE and TFM seat materials retain flexibility and sealing integrity where standard PTFE becomes brittle. Ball vent holes and body cavity gas vents prevent trapped cryogenic liquid from expanding and locking the closing element. Top entry ball valves offer in-line service access without pipeline removal. Two-piece ball valves deliver compact bodies for small-bore LNG and cryogenic sampling lines. Butt weld globe valves eliminate flanged connections for zero flange leak risk on permanent installations. Butterfly valves with inspection ports combine isolation and real-time process monitoring through sealed access ports. Control valves with multi-stage trim prevent flash flow during cryogenic pressure letdown while extended bonnets keep actuators warm. Flanged forged steel gate valves provide forged-body zero-porosity integrity at 2"-12". Cast-body gate valves cover 1/2"-24" at cost-effective pricing. Small-bore forged gate valves with socket weld/threaded ends deliver critical isolation at 1/2"-2" up to Class 800.

Fluorine-Lined Valves

Fluorine lined valves isolate corrosive process fluid from the metal body through a thick (2-5mm) fluoropolymer liner covering every wetted surface inside the valve cavity. The metal outer body (ductile iron, carbon steel, or stainless) provides structural strength and pressure containment — the fluoropolymer liner provides chemical resistance. This dual-wall construction separates the two functions that standard metal valves combine in one material: pressure containment and corrosion resistance. No metal surface touches the process fluid. Zero corrosion attack on the body, zero contamination of process media by metal ions, zero galvanic concerns. FLOWKS manufactures five fluorine lined valve configurations using three liner materials. PTFE (polytetrafluoroethylene) lined ball valves use a 3-5mm full-body PTFE sleeve covering all internal surfaces — PTFE is chemically inert to virtually everything except molten alkali metals and elemental fluorine at high temperature, making it the last-line corrosion barrier when stainless, Hastelloy, and titanium all fail. PFA (perfluoroalkoxy) lined globe valves use PFA's superior melt-processability and 10x lower cold-flow creep than PTFE — the smoother molded surface and higher dimensional stability survive thousands of disc-seat throttling cycles where PTFE would thin and leak. PTFE lined butterfly valves bring corrosion isolation to large diameters (2"-24") at Class 150 where lined ball valves would cost 2-3x more. FEP (fluorinated ethylene propylene) lined check valves use FEP's smoother melt-molded surface for better disc hinge dynamics and lower friction — same chemical resistance as PTFE, better mechanical behavior for the swing/lift check function. Vertical ball type fluorine lined check valves use a free-floating ball as the only moving part — no hinge, no spring, no guide mechanism, one-ball gravity closure with the fewest failure modes in corrosive check service. FLOWKS fluorine lined valves provide zero-metal-contact corrosion isolation for concentrated acids, chlorine, caustics, solvents, and all process media that attack stainless steel, Hastelloy, and titanium. Thick PTFE, PFA, and FEP liners (2-5mm) cover every wetted surface inside the valve body — the metal outer shell holds pressure while the fluoropolymer liner blocks chemical attack. PTFE lined ball valves deliver full-body corrosion isolation at 1/2"-12" Class 150-300 for chemical processing and pharmaceutical manufacturing where the process attacks every available metal. PFA lined globe valves use PFA's 10x lower cold-flow creep and smoother melt-molded surface for throttling service — the liner survives thousands of disc-seat cycles where PTFE would thin and leak. PTFE lined butterfly valves bring fluoropolymer isolation to large diameters (2"-24") at Class 150 at significantly lower cost than lined ball valves. FEP lined check valves apply FEP's smoother surface finish for better disc swing/lift dynamics — same chemical resistance, lower friction, more reliable opening and closing. Vertical ball type fluorine lined check valves use a single free-floating ball as the only moving part — gravity closure, zero mechanical complexity, the fewest failure modes for corrosive vertical check service.

Check Valves

Check valves prevent reverse flow in piping systems — they open with forward flow velocity and close when forward flow stops or reverses, protecting pumps, compressors, and process equipment from backflow damage. No external actuation required; the flow itself drives opening and closing through disc weight, spring force, or fluid dynamics. FLOWKS manufactures eight check valve configurations spanning four closing mechanisms and three body formats. Swing check valves use a full disc swinging on a hinge pin — 80° opening angle gives near-full-bore passage and minimal pressure drop, gravity closure, the default for steady-flow pump discharge at 2"-24". Butt weld swing check valves apply forged bodies and butt weld connections at Class 150-2500 where flanged gaskets become reliability liabilities under high-pressure impact slamming. External pin swing check valves add a hydraulic dashpot to the hinge pin — controlled closing over 1-3 seconds eliminates water hammer on pump-trip and long-pipeline applications. Lug type dual plate check valves split the closing motion between two half-discs with torsion spring assist — shorter travel means faster closure (0.2-0.5 seconds), lug format allows dead-end service, compact face-to-face dimension. Vertical lift check valves lift a disc vertically off the seat with upward flow — short travel distance for fast closure at 1/2"-4", disc guide ensures centered seating, vertical-only installation. Double flanged dual plate check valves provide full flanged structural integrity at 2"-48" and Class 600 where wafer/lug bodies lack sufficient pipeline load resistance. Axial flow check valves move the disc along the flow axis into an upstream cage — full-bore open passage with zero obstruction, lowest pressure drop of any check design, spring-loaded closing for zero-backpressure reliability, specified for compressor discharge and continuous-flow pipeline stations. Wafer single disc swing check valves deliver economy swing check protection at Class 150-300 in thin wafer format — simplest, cheapest, basic reverse-flow prevention for water, HVAC, and general process lines. FLOWKS check valves provide automatic reverse-flow prevention across the full range of industrial piping sizes and pressures. Swing check valves deliver near-full-bore passage with 80° disc opening and gravity closure — the default for steady-flow pump discharge at 2"-24" Class 150-600. Butt weld swing check valves with forged bodies eliminate flanged connections at Class 150-2500 where gaskets leak under high-pressure disc impact slamming. External pin swing check valves add hydraulic dashpot control for 1-3 second gradual closure that eliminates water hammer on pump-trip and long-pipeline applications. Lug type dual plate check valves close faster with two spring-assisted half-discs — 0.2-0.5 second closure, dead-end service capability, compact face-to-face dimension at 2"-48". Vertical lift check valves provide fast guided closure on small-bore vertical lines at 1/2"-4" where disc alignment precision matters. Double flanged dual plate check valves deliver maximum structural integrity at 2"-48" Class 600 for waterworks and critical pipeline stations. Axial flow check valves offer the lowest pressure drop with full-bore unobstructed passage and spring-loaded closing — compressor discharge and continuous-flow pipeline protection. Wafer single disc swing check valves give economy reverse-flow prevention at Class 150-300 in compact wafer format for water and HVAC service.

Gate Valves

Gate valves isolate — they open to let full flow pass through the bore unobstructed, or close to block it completely. They are not throttling valves. A partially-open gate valve has the wedge or gate sitting in the flow stream, which causes vibration, seat erosion, and noise. Specify a globe or control valve for throttling; specify a gate valve for on/off isolation. FLOWKS manufactures four gate valve configurations covering the full range of process piping sizes, pressures, and temperatures. Handwheel gate valves with solid wedge and bolted bonnet are the default isolation valve for general process piping — Class 150-600 at 2"-24", simple manual operation, rising-stem visual position indication, proven and affordable. Forged steel self-sealing wedge gate valves with pressure-seal bonnet and forged body deliver zero-porosity integrity at Class 600-2500 where bolted bonnets become structurally impractical and casting defects unacceptable — the line pressure itself compresses the seal ring tighter as pressure rises. Flexible wedge gate valves solve thermal binding — the two wing sections deflect independently to accommodate seat-ring expansion, pipe stress, and body distortion that would trap a solid wedge between expanded seats at high temperature. Flat gate valves (through-conduit slab/expanding gate) provide full-bore unobstructed passage when open — the bore-sized hole in the gate plate aligns with the pipeline for zero flow restriction, enabling pipeline pigging and minimizing pressure drop on long crude/gas transmission lines. FLOWKS gate valves provide on/off isolation across the full range of industrial piping sizes, pressures, and temperatures. Handwheel gate valves with solid wedge and bolted bonnet cover general process isolation at Class 150-600 from 2"-24" — the workhorse configuration for oil & gas, petrochemical, water, and moderate-temperature steam service with rising-stem visual position indication. Forged steel self-sealing wedge gate valves with pressure-seal bonnet deliver high-pressure, high-temperature isolation at Class 600-2500 — forged body eliminates casting porosity, pressure-seal bonnet uses line pressure as the sealing force instead of massive bonnet bolts, flexible wedge compensates for thermal expansion binding at operating temperatures above 350°F. Flexible wedge gate valves prevent thermal seat binding in steam and cycling-temperature service — each wing deflects independently to maintain seat contact when body expansion distorts the seat geometry. Flat gate valves with through-conduit design provide full-bore unobstructed passage for pipeline pigging and zero-pressure-drop isolation on crude oil, natural gas, and product pipelines from 2"-48" — slab gate for basic isolation, expanding gate for bubble-tight shutoff at low differential pressure.

Globe Valves

Globe valves throttle and isolate. The disc lifts off and presses onto a seat ring — that seating mechanism allows the disc to sit at any intermediate position between full-open and full-closed, giving flow regulation authority that gate and ball valves cannot provide at partial opening. The tradeoff: higher pressure drop. Globe valves force flow through two 90° direction changes in the standard T-pattern (Z-body) design, creating 3-5x more pressure drop at full-open than gate or ball valves of the same size. That pressure drop is acceptable because globe valves are specified for throttling service where flow reduction is the purpose, not for full-flow isolation where minimizing pressure drop is the priority. FLOWKS manufactures three globe valve configurations. Standard globe valves with bolted bonnet, solid disc, and T-pattern body cover general throttling and isolation at Class 150-600 from 2"-12" — water, steam, oil, chemical bypass and recirculation lines where flow regulation is needed. High-pressure self-sealing Y globe valves combine forged body integrity, pressure-seal bonnet sealing, and Y-pattern body flow geometry for Class 600-2500 service — the Y-pattern reduces pressure drop by 30-50% through a single 45° flow turn instead of two 90° turns, and the pressure-seal bonnet eliminates massive bonnet bolts at high operating pressure. High-pressure self-sealing flanged globe valves use the same forged body and pressure-seal bonnet in a standard T-pattern body — higher pressure drop but more throttling authority, familiar maintenance geometry, and compact pipe rack installation for power station steam bypass and petrochemical high-pressure throttling. FLOWKS globe valves provide throttling and on/off isolation across general process and high-pressure service. Standard globe valves with T-pattern body, bolted bonnet, and Stellite-seated disc cover Class 150-600 throttling and isolation from 2"-12" — bypass lines, recirculation, pump minimum-flow protection, and general process throttling where disc positioning authority matters more than pressure drop efficiency. High-pressure self-sealing Y globe valves deliver Class 600-2500 throttling with forged body zero-porosity integrity, pressure-seal bonnet that uses line pressure as the sealing force, and Y-pattern body that reduces full-open pressure drop by 30-50% compared to T-pattern — specified for power station main steam bypass, reheater drain, and feedwater recirculation where high-pressure throttling authority meets energy-efficiency pressure drop requirements. High-pressure self-sealing flanged globe valves use the same forged body and pressure-seal bonnet in the standard T-pattern body — more throttling authority from higher pressure drop, compact straight-line pipe rack installation, and familiar maintenance geometry for plant teams accustomed to T-pattern globe valve service. Stellite overlay on seat ring and disc face survives high-velocity erosion and disc-seat impact at Class 600+ operating pressures.

Pneumatic Actuators

Pneumatic actuators convert compressed air energy into valve motion — linear thrust for globe, gate, and control valves, or rotary torque for ball, butterfly, and plug valves. The actuator type matches the valve motion type: linear actuators push valve stems up and down, rotary actuators turn valve shafts 90°. FLOWKS manufactures five pneumatic actuator configurations spanning both motion types and three force-generation mechanisms. Diaphragm pneumatic actuators produce linear thrust through a flexible diaphragm that deflects under air pressure — low supply pressure (40-80 psi), large diaphragm area compensates for the lower pressure, spring-return fail-safe, and the standard actuator for process control valves where low hysteresis and precise stem positioning matter. Diaphragm pneumatic actuators with handwheel add a declutchable manual override for plant startup and air-supply-outage operation — same actuator performance, plus handwheel positioning when air isn't available. Scotch yoke pneumatic actuators produce variable rotary torque through a piston-driven yoke mechanism — torque peaks at the initial breakout position to unseat quarter-turn valves, and the geometry delivers higher torque at large valve sizes (8"-48" butterfly, 8"-24" ball) where rack-and-pinion actuators can't generate enough force. Linear stroke cylinders use a piston-in-cylinder design for linear thrust — higher supply pressure (up to 150 psi), longer stroke capability (up to 12"), more compact than diaphragm actuators at equivalent thrust, specified for gate valves with long stem travel and tight-installation spaces. AT series cylinders are rack-and-pinion rotary actuators in extruded aluminum bodies — constant torque across 90° stroke, NAMUR accessory mounting, compact and lightweight for small-to-medium quarter-turn valve automation up to 12" butterfly and 8" ball sizes. FLOWKS pneumatic actuators automate valve operation across both linear-stroke and quarter-turn valve types. Diaphragm pneumatic actuators deliver linear thrust for globe, gate, and control valves — low supply pressure, spring-return fail-safe, low hysteresis for precise modulating control, thrust range 100-10,000 lbf. Diaphragm pneumatic actuators with handwheel add declutchable manual override for startup commissioning and air-supply-outage operation — same actuator plus manual positioning capability when compressed air is unavailable. Scotch yoke pneumatic actuators produce variable rotary torque for large quarter-turn valves — torque peaks at initial breakout for reliable ball and butterfly valve unseating, output range 500-100,000 Nm across model sizes, spring-return or double-acting. Linear stroke cylinders provide piston-driven linear thrust for long-stroke gate and globe valves — higher supply pressure up to 150 psi, stroke range 1"-12", compact installation where diaphragm actuator size doesn't fit. AT series cylinders are rack-and-pinion quarter-turn actuators in extruded aluminum — constant torque output, NAMUR solenoid and accessory mounting, compact lightweight design for automated ball and butterfly valves up to moderate sizes, torque range 10-5,000 Nm.

Others

Not every valve product fits neatly into a single category. Some are specialty designs built for niche applications that don’t map to ball, gate, globe, butterfly, or any of the standard valve families. Others are accessories and peripheral equipment — components that sit alongside valves in a piping system, supporting valve operation, protecting valve integrity, or extending valve functionality into areas that the valve itself can’t cover. FLOWKS groups these products under the Others category. It’s not a catch-all bin — it’s a deliberate home for products that serve real engineering functions but don’t belong to the mainstream valve type classifications. Specialty valves cover one-off configurations: steam traps that drain condensate from steam lines without losing live steam, pressure relief valves that protect equipment from overpressure events, blowdown valves that purge accumulated sediment from boiler drums and process vessels. These are valves, technically, but they’re specified by function (trap, relieve, purge) rather than by body geometry (ball, gate, globe). Valve accessories cover the equipment that bolts onto, mounts next to, or connects into the valve installation: positioners that convert control signals into precise actuator stem movement, limit switch boxes that confirm valve open/closed status back to the control system, solenoid valves that direct air supply to pneumatic actuators on command, locking devices that prevent unauthorized valve operation on critical process lines. These aren’t valves — they’re valve support hardware. But they’re inseparable from the valve installation. A pneumatic actuated ball valve without a solenoid and a limit switch is just a ball valve with a cylinder sitting on top — it can’t receive commands or report status. The accessories make the automated valve system functional. Piping peripherals cover the non-valve components that share the same piping runs and serve related process functions: strainers that catch debris before it reaches valve seats, sight glasses that let operators verify flow or level through a transparent window, expansion joints that absorb pipe movement so it doesn’t crush valve bodies. These are pipe components, not valves, but they’re specified by the same engineers, installed by the same contractors, and maintained by the same plant teams. Putting them in the same product catalog saves the customer from sourcing across multiple suppliers. FLOWKS Others covers specialty valves, valve accessories, and piping peripherals that don’t fit the mainstream valve type categories — products specified by function rather than body geometry, or supporting hardware that makes valve installations actually work. Specialty valves include steam traps for condensate drainage without live-steam loss, pressure relief valves for overpressure protection on vessels and pipelines, and blowdown valves for sediment purge from boiler drums and process equipment — functional valve designs that serve niche but critical process duties. Valve accessories include positioners for precise actuator stem positioning from control-loop signals, limit switch boxes for open/closed status feedback to SCADA and DCS systems, solenoid valves for air-direction control on pneumatic actuators, and locking devices for unauthorized-operation prevention on safety-critical isolation points — the hardware that turns an automated valve from a passive cylinder-on-top assembly into a functioning control system node. Piping peripherals include strainers for debris protection upstream of valve seats, sight glasses for visual flow and level verification, and expansion joints for pipe-movement isolation that prevents body distortion on installed valves. Same engineers specify them, same contractors install them, same plant teams maintain them — one catalog, one supplier, one accountability chain.

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