Danfoss NRVA 40 Check Valve 40 mm (1 1/2 in) Butt Weld 020-2004
Danfoss · HVAC & Refrigeration · Check Valves
Danfoss NRVA 40 check valve (non-return valve) for industrial refrigeration, OEM P/N 020-2004. Prevents reverse flow of refrigerant in liquid, suction and hot-gas lines of ammonia (R717), HCFC and HFC plant. Butt-weld connection 40 mm (1 1/2 in) to EN 10220 (ANSI B 36.10 pipe schedules). Fitted with a damping piston, so it is suited to pulsating lines such as the compressor discharge line, and a PTFE valve seat for tight seating with minimum closing force. No orientation limitation. Max working pressure 40 bar (580 psig); media temperature -50 °C to 140 °C. NRVA = standard spring; a stronger spring is available for special duties (see ordering table). Verify refrigerant compatibility against the datasheet.
Specifications
- Part number
- 020-2004
- HS code
- 8481.30
- Material
- Valve housing steel (A352 LCC / P285QH); valve seat PTFE; spring stainless steel (A2-70); damping piston stainless steel
- Pressure rating
- 40 bar (580 psig) max working pressure
- Temperature range
- -50 °C to 140 °C
Compatibility
Install in the direction of the flow arrow. The differential pressure across the valve must exceed the minimum opening pressure differential, including at the lowest capacity of capacity-regulated compressors. When butt-welding the connections, protect the internal seat and piston from weld heat. Verify code, connection size and spring variant before ordering.
Standards
Approvals
HVAC & Refrigeration · More Danfoss · Printable datasheet