Cryogenic Flanged Globe Valve

Cryogenic flanged globe valves are designed for precise flow control in ultra-low temperature piping systems, operating from -196C to -50C. The flanged end connection per ASME B16.5 facilitates installation and maintenance in cryogenic process lines where welding may be impractical due to material constraints at low temperatures.

Design Features: - Extended bonnet with gas column insulation to protect stem packing from cryogenic temperatures - Globe pattern with parabolic or V-port plug for accurate modulating control - Forge or cast austenitic stainless steel body (A351 CF8M / A182 F316L) for cryogenic toughness - Bonnet bolts and nuts of low-temperature alloy steel per ASTM A320/A194 - Cavity relief hole in wedge to prevent trapped fluid expansion damage - Available with pneumatic or electric actuator for automated cryogenic process control

Q: What is the difference between cryogenic globe valves and cryogenic gate valves? A: Globe valves offer superior flow regulation capability with higher pressure drop, making them ideal for modulating control in cryogenic processes. Gate valves provide straight-through flow with minimal pressure drop, suited for on/off isolation. In cryogenic service, globe valves are typically used for bypass, vent, and control lines while gate valves handle main isolation.

Q: How does cavity relief work in cryogenic globe valves? A: A small hole is drilled in the wedge or disc to connect the body cavity with the upstream side. When the valve is closed and the trapped cryogenic fluid warms and expands, the cavity relief hole prevents dangerous pressure buildup that could damage the valve body or stem.

Q: What testing is required for cryogenic globe valves? A: Cryogenic valves require special testing per BS 6364 including: helium mass spectrometer leak testing at cryogenic temperature, cryogenic seat leakage test at -196C with helium, and thermal cycling test. Each valve must demonstrate bubble-tight shutoff at design cryogenic temperature before shipment.