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.