Danfoss NRV, NRVH Data sheet

Data Sheet

Check valve Type NRV and NRVH

Version 2

NRV and NRVH piston type check valves are designed for installation in commercial refrigerating systems and in residential or industrial air conditioning plants. They are used to control the unidirectional ow of refrigerant so as to prevent backow.

Features:

• Available in both straightway and angleway versions which is easy to connect

• Hermetic tight design for solder versions with low risk of external leakage

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

• NRVH type check valve is with stronger spring and it‘s recommended to use for compressors in parallel (i.e. power packs) where higher level of pulsation and vibration are expected

• Low pressure drop during operation

• Oversize connections provide exibility in use

AI150286435592en-000901

Check valve, type NRV and NRVH

Functions

NRV/NRVH are used to control the unidirectional ow of refrigerant so as to prevent backow. When selecting the right Danfoss check valve, it’s recommended to use Coolselector which is a Danfoss calculation and selection software. When dimensioning and selecting Danfoss check valves for mounting into the compressor discharge line, it is important to be aware of the following:

The dierential pressure across the valve must always be higher than the given minimum pressure drop at which the valve is open. This also applies to lowest capacities for compressor with capacity regulation. NRVH type check valve is with stronger spring and it’s recommended to use for compressors in parallel (i.e. power packs) where higher level of pulsation and vibration are expected.

Danfoss

9G8082

Check valve, type NRV and NRVH

Applications

Typical applications for NRV and NRVH valves are:

• Cold room

• Heat pump

• VRF

• Chiller

Figure 1: Application Diagram

Valve type

Connection type

Max. working

pressure

Refrigerants

(PS/MWP)

NRV/NRVH 6-19

Straight-way - are

46 bar/ 667 psig

R134a, R22/R407C, R404A/R507, R407A, R407F, R407H, R410A, R448A, R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A, R513A, R515B, R516A, R1233zd(E), R1234ze(E), R1234yf

NRV/NRVH 6s-19s

(1)

Straight-way - solder

49 bar / 710 psig

R134a, R22/R407C, R290, R32, R404A/R507, R407A, R407F, R407H, R410A, R448A, R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A, R513A, R515B, R516A, R600, R600a, R1233zd(E), R1234ze(E), R1234yf, R1270

NRV/NRVH 22s-35s

(1)

Angle-way - solder

46 bar/ 667 psig

R134a, R22/R407C, R290

(2)

, R404A/R507, R407A, R407F, R407H, R410A,

R448A, R449A, R449B, R450A, R452A, R452B

(2)

, R454A

(2)

, R454B

(2)

, R454C

(2)

R455A

(2)

, R513A, R515B, R516A

(2)

, R600

(2)

, R600a

(2)

, R1233zd(E), R1234ze(E),

R1234yf

(2)

, R1270

(2)

NRV/NRVH 22s E-35s E

(1)

Angle-way - solder

49 bar / 710 psig

R290, R32, R452B, R454A, R454B, R454C, R455A, R516A, R600, R600a, R1234ze(E), R1234yf, R1270

Refrigerant oil

POE, PAG (PVE, PAO)

Check valve, type NRV and NRVH

Media

Table 1: Media

(1)

Oversize connections

(2)

NRV/NRVH 28s



NOTE:

• For a complete list of approved refrigerants, visit http://store.danfoss.com/ and search for individual code numbers, where refrigerants are listed as part of product details.

• This product is approved for R290, R32, R452B, R454A, R454B, R454C, R455A, R516A, R600, R600a, R1234ze(E), R1234yf and R1270 by ignition source assessment in accordance to standard EN ISO 80079-36.

• NRV/NRVH is not suitable for oil line application. For detailed information please contact Danfoss.

• Flare/face seal connections are only approved for A1 and A2L refrigerants.

• R32 can only be used for 49bar NRV/NRVH.

• R1234ze can be used for NRV size up to 35s according to the PED category I, Fluid II

(1)

-35s

can be used with ammable refrigerants, without certicate of PED Fluid Group 1, category II

-35s

can be used with ammable refrigerants, without certicate of PED Fluid Group 1, category II

Technical data

Values

Max. working pressure

See ordering table

Media temperature range

See ordering table

Environmental transport/storage temperature and humidity

-40 – 65 °C /-40 – 150 °F. Air humidity: RH≤95%

Flow direction

Single ow

Serviceable

Box label

Product label

Position

Inscription

Explanation

Box label; Product label

Check valve

Product name

Box label

020B1010

Code number for ordering

Box label

NRV 6s

Product type; no numeral on product label

Box label

Straightway

Direction

Box label

ODF 1/4 in

Connection size and type

Box label; Product label

PS 49 bar/MWP 710 psig

Max. working pressure in bar and psig

Box label

BE4520C

Code for production place and time (BE = Wuqing, week 45, year 2020, weekday C = Wednesday)

Box label; Product label

MADE IN CHINA

Manufacturing site acc. to EN standards

Box label

EAN code

Barcode for individual code no. identication according to EAN standard

Product label

Min/Max Temp: -50/+155 °C

Media temperature range, min and max.

Product label

Arrow

Flow direction indicator

Box label; Product label

Additional information: Relevant approval authority logos

Check valve, type NRV and NRVH

Product specication

Technical data

Table 2: Technical data

Identication

Relevant product data is available on the product and box label. An example of a box label and product label are shown, including an explanation of the content.

Table 3: Box label & product label (example)

Table 4: Product and label text

Design and materials

The pressure of the uid passing through a refrigeration system opens the valve, while any reverse ow closes the valve.

In NRV/NRVH check valves a sealing disc is activated by the spring to close or open the valve, and the force of the spring determines the dierential opening pressure.When the refrigerant ows through the valve and the dierential pressure is more than Min. opening pressure, the piston will move to stop face and compress the spring, then the valve will open.

NRV/NRVH valves are equipped with a damping piston for improved performance in lines where pulsations can occur, e.g. in the discharge line from a compressor.

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