Description
The Hansen VW251C is a 2-1/2" (65 mm) butt weld angle hand expansion valve with a yellow seal cap. Hansen hand expansion valves are precision-calibrated, adjustable slotted plug flow regulating valves for metering or flashing expansion of liquid refrigerants; valves 2-1/2" and larger use a characterized plug.
Service kits listed by Hansen for 2-1/2" bolted bonnet hand expansion valves: gasket kit 50-1043, bonnet kit 50-1108, throttling plug kit 50-1059 and seal cap kit 50-1050.
Key specifications
- Catalog number: VW251C (angle, butt weld, bolted bonnet, yellow seal cap)
- Size: 2-1/2" (65 mm); welded connections match Schedule 40 pipe
- Body: cast steel, ASTM A352 Grade LCB; bonnet: cast ductile iron, ASTM A536
- Stem: polished stainless steel with back seating; seat disc: retained PTFE (Teflon)
- Throttling plug: zinc plated steel, slotted and characterized
- Stem packing: graphite composite plus neoprene O-ring in series
- Seal cap: yellow, zinc plated steel, painted
- Safe working pressure: 400 psig (28 bar g) standard; 600 psig (41 bar g) available on request
- Operating temperature: -60°F to 240°F (-51°C to 115°C) standard
- Hansen capacity table, R717 circulating 4:1 (10 psi drop): about 66 to 410 tons
Common questions
What is a hand expansion valve used for?
Hansen lists liquid feed or circulating liquid overfeed evaporators; high or intermediate pressure liquid feed to accumulators, intercoolers or recirculators; defrost condensate relief; hot gas feed to evaporators; and equalizing an evaporator to suction pressure after defrost. Hansen states these valves suit ammonia or halocarbons.
What is the difference between the VW251C and the VW251H?
The C suffix means this valve has a yellow seal cap; the VW251H has a bar handle. Hansen uses the bar handle or yellow seal cap to distinguish hand expansion valves from shut-off valves.
Specifications are based on Hansen Technologies Bulletin G510b (Hand Expansion Valves, Feb 2013). Confirm fit, ratings and application requirements before ordering.
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