Danfoss NRVA Data sheet

Data Sheet

Check valve Type NRVA

Used in liquid, suction and hot gas lines in refrigeration

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 uorinated 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.

Features:

• Ensures correct direction of ow

• Valve housing made of steel

• Available for 40 bar / 580 psig working pressure

• Large range of anges with connection dimensions 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

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

AI241186442960en-000601

Check valve, Type NRVA

Media

Refrigerants

Applicable to HCFC, HFC and R717 (Ammonia). For further information please see installation instruction for NRVA.

Use with ammable hydrocarbons cannot be recommended; please contact Danfoss www.danfoss.com/en/service-

and-support/learning/.

New refrigerants

Danfoss products are continually evaluated for use with new refrigerants depending on market requirements.

When a refrigerant is approved for use by Danfoss, it is added to the relevant portfolio, and the R number of the refrigerant (e.g. R513A) will be added to the technical data of the code number. Therefore, products for specic refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.

Description

Values

Temperature range

-50 °C – 140 °C / -58 °F – 284 °F

Pressure range

Max. working pressure: 40 bar / 580 psig

No.

Part

Material

DIN

ISO

ASTM

1

Housing

Steel

G20Mn5QT

(1)

EN10213-3

P285QH

EN10222-4

LCC, A352

LF2,A350

2

Flanges

Steel

RSt. 37-2, 10025

Fe360 B, 630

Grade C, A 283

3

Valve cone

Stainless steel

Teon

5

Spring

Steel9Bolts

Stainless steel

A2-7010Nut

Stainless steel

11

Gasket

Non asbestos

12

Valve seat

Steel

Check valve, Type NRVA

Product specication

Pressure and temperature

Table 1: Pressure and temperature data

Design

Gaskets:

Do not contain asbestos.

Valve cone:

The valve cone has a teon tightening ring. Teon tightening ring renders perfect sealing at a minimum closing force.

Material specication

Figure 1: Material specication for NRVA check valves

Table 2: Material specication for NRVA check valves

(1)

NRVA 40 / NRVA 50 housing material is TTSt 35N until January 2006

Connections

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