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

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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.

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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

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Check valve, type NRV and NRVH

Media

Table 1: Media

			Max. working
	Valve type	Connection type	pressure	Refrigerants
			(PS/MWP)
				R134a, R22/R407C, R404A/R507, R407A, R407F, R407H, R410A, R448A,
	NRV/NRVH 6-19	Straight-way - €are	46 bar/ 667 psig	R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A, R513A,
				R515B, R516A, R1233zd(E), R1234ze(E), R1234yf
				R134a, R22/R407C, R290, R32, R404A/R507, R407A, R407F, R407H, R410A,
	NRV/NRVH 6s-19s (1)	Straight-way - solder	49 bar / 710 psig	R448A, R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A,
				R513A, R515B, R516A, R600, R600a, R1233zd(E), R1234ze(E), R1234yf, R1270
				R134a, R22/R407C, R290 (2), R404A/R507, R407A, R407F, R407H, R410A,
	NRV/NRVH 22s-35s (1)	Angle-way - solder	46 bar/ 667 psig	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

(1)Oversize connections

(2)NRV/NRVH 28s (1)-35s (1) can be used with €ammable refrigerants, without certi†cate of PED Fluid Group 1, category II

Refrigerant oil	POE, PAG (PVE, PAO)

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

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Check valve, type NRV and NRVH

Product specification

Technical data

Table 2: Technical data

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	No

Identification

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)

Box label	Product label

Table 4: Product and label text

	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 accord-
			ing 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

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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