Danfoss Check valves Type NRVA15-20 NRVA32-40 NRVA50-65D product introduction

Check valve type NRVA can be used in liquid,suction and hot gas lines in refrigeration and air conditioning plant with ammonia.NRVA can also be used in refrigerating systems with fluorinated refrigerants.When the NRVA is used in liquid lines where cold, thick oil or impurities may be present, it is recommended that the standard spring be replaced by a special spring. See ordering table.

Danfoss Check valves Type NRVA15-20 NRVA32-40 NRVA50-65D Features

• Ensures correct direction of flow.

• Valve housing made of steel.

• Available for 40 bar g / 580 psig working pressure.

• Large range of flanges with connection dimen-sions in accordance with standards: DIN, ANSI,SOC, SA and FPT.

• Fitted with damping piston that makes the valves suitable for installation in lines where pulsation can occur, e.g. in the discharge line from the compressor.

• Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company.

Danfoss Check valves Type NRVA15-20 NRVA32-40 NRVA50-65D Design 

Connections

There is a very wide range of connection possibilities with NRVA check valves:

• Welding, DIN (2448)

• Welding, ANSI (B 36.10)

• Welding socket, ANSI (B 16.11)

• Solder connection, DIN (2856)

• Solder connection, ANSI (B 16.22)

• FPT internal thread, NPT(ANSI/ASME B 1.20.1)

Gaskets:

Do not contain asbestos.

Valve cone:

The valve cone has a teflon tightening ring.Teflon tightening ring renders perfect sealing at a minimum closing force.

Danfoss Check valves Type NRVA15-20 NRVA32-40 NRVA50-65D Technical data

• Refrigerants

Applicable to HCFC, HFC and R717 (Ammonia).

For further information please see installation

instruction for NRVA.

Use with flammable hydrocarbons cannot be

recommended; please contact Danfoss.

• Temperature range

-50 – 140 °C / -58 – 284 °F.

• Pressure range

The valve is designed for:

Max. working pressure: 40 bar g / 580 psig.