Description
The Hansen RW402C is a 4" (100 mm) butt weld globe hand expansion valve with a yellow seal cap. Hand expansion valves are precision-calibrated, adjustable flow regulating valves used to meter liquid refrigerant or flash it to a lower pressure. Valves 2-1/2" and larger use a characterized slotted throttling plug for near-linear flow per turn open.
Key specifications
- Catalog number: RW402C (globe, Y-style body, butt weld, yellow seal cap)
- Size: 4" (100 mm); welded connections match Schedule 40 pipe
- Body: cast steel, ASTM A352 Grade LCB; bolted bonnet: cast ductile iron, ASTM A536
- Stem: polished stainless steel with back seating; tight-closing retained PTFE (Teflon) seat
- 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) 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 150 to 1100 tons
- Suitable for ammonia or halocarbon refrigerants
Common questions
What is a hand expansion valve used for?
Hansen lists liquid feed to 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.
How is it different from a shut-off valve?
It has a slotted throttling plug for adjustable metering. Hansen uses a 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.
Disclaimer: The image shown is a general representation of the product category and may not depict the exact part number offered. Actual product appearance, specifications, and configuration may vary.
