Danfoss NRV 10s H Data sheet

Data sheet

Check valve for high pressure

Type NRV 10s H for R744 (CO2)

NRV 10s H check valves for R744 (CO2) can
work as an internal relief valve when installed in
parallel with GBC Ball Valves or service shut off
valves, at the inlet and outlet of components to
be serviced. The NRV 10s H can also be used in
hot gas defrosting lines.

Features y The valve ensures that refrigerant only flow in

one direction.

y Allows for internal pressure relief in the

standstill system or during maintenance.

y The valve can withstand 90 bar / 1305 psig

differential pressure and 90 bar / 1305 psig
maximum working pressure.

© Danfoss | DCS (nb) | 2019.12

AI223286434281-000502 | 1

Document type | Check valves, type NRV 10s H for R744 (CO

2

)

Technical data

Refrigerants R744 (CO2)

Oil POE, PAG

Media temperature range -50 – 140 °C / -58 – 285 °F

Max. working pressure (PS/MWP) 90 bar / 1305 psig

Approvals:

Notes:
For the application use with R744 as part of a secondary loop or cascade:

1. The design pressure of the refrigerant containing component is not less than the design pressure of the
associated components.

2. The component is not provided with any pressure relief or pressure regulating relief valve and that a sufficient
number of valves having capacity deemed adequate shall be field-installed on the refrigeration system.

3. When the refrigeration system is de-energized, venting of R744 may occur through the pressure regulating
relief valves, and may need to be recharged, but the valve should not be defeated or bypassed.

4. A sufficient number of pressure relief and pressure regulating valves may need to be provided based upon
system capacity and located such that no stop valve is provided between the relief valve and the parts or
section of the system being protected.

Design

Ordering

1. Copper tube

2. Solder ring

3. Washer

4. Sealing disk with special material

5. Piston

6. Spring

7. Valve body

8. Guide

9. Stop face

10. Solder ring

11. Copper tube

Type

NRV 10s H

1)

ΔP

2)

The kv value is the flow of water in m3/h at a pressure drop across valve of 1 bar, ρ = 1000 kg/m3.

Connection
type

Straightway
Solder ODF

1

= Minimum Opening Pressure Differential

Connection

size

[in.] [mm] [bar] [psi] [m3/h] [gal/min]

3

⁄8 0.4 5.8 0.9 1.04 020B4000

The Cv value is the flow of water in gal/min at a pressure drop across valve of 14.5 psi.

Min. OPD

ΔP

Kv value 2) Cv value 2)

1

10 0.4 5.8 0.9 1.04 020B4300

Code no.

© Danfoss | DCS (bh) | 2019.12

AI223286434281-000502 | 2