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 | Climate Solutions | 2021.03 |
AI150286435592en-000901 | 2 |
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
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Max. working |
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Valve type |
Connection type |
pressure |
Refrigerants |
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(PS/MWP) |
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R134a, R22/R407C, R404A/R507, R407A, R407F, R407H, R410A, R448A, |
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NRV/NRVH 6-19 |
Straight-way - €are |
46 bar/ 667 psig |
R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A, R513A, |
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R515B, R516A, R1233zd(E), R1234ze(E), R1234yf |
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R134a, R22/R407C, R290, R32, R404A/R507, R407A, R407F, R407H, R410A, |
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NRV/NRVH 6s-19s (1) |
Straight-way - solder |
49 bar / 710 psig |
R448A, R449A, R449B, R450A, R452A, R452B, R454A, R454B, R454C, R455A, |
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R513A, R515B, R516A, R600, R600a, R1233zd(E), R1234ze(E), R1234yf, R1270 |
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R134a, R22/R407C, R290 (2), R404A/R507, R407A, R407F, R407H, R410A, |
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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), |
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R455A (2), R513A, R515B, R516A (2), R600 (2), R600a (2), R1233zd(E), R1234ze(E), |
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R1234yf (2), R1270 (2) |
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NRV/NRVH 22s E-35s E (1) |
Angle-way - solder |
49 bar / 710 psig |
R290, R32, R452B, R454A, R454B, R454C, R455A, R516A, R600, R600a, |
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R1234ze(E), R1234yf, R1270 |
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(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) |
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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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AI150286435592en-000901 | 4 |
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 |
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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 |
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Table 4: Product and label text
Position |
Inscription |
Explanation |
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Box label; Product label |
Check valve |
Product name |
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Box label |
020B1010 |
Code number for ordering |
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Box label |
NRV 6s |
Product type; no numeral on product label |
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Box label |
Straightway |
Direction |
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Box label |
ODF 1/4 in |
Connection size and type |
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Box label; Product label |
PS 49 bar/MWP 710 psig |
Max. working pressure in bar and psig |
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Box label |
BE4520C |
Code for production place and time (BE = Wuqing, |
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week 45, year 2020, weekday C = Wednesday) |
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Box label; Product label |
MADE IN CHINA |
Manufacturing site acc. to EN standards |
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Box label |
EAN code |
Barcode for individual code no. identi†cation accord- |
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ing to EAN standard |
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Product label |
Min/Max Temp: -50/+155 °C |
Media temperature range, min and max. |
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Product label |
Arrow |
Flow direction indicator |
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Box label; Product label |
Additional information: Relevant approval authority |
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logos |
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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.
© Danfoss | Climate Solutions | 2021.03 |
AI150286435592en-000901 | 5 |