Danfoss NRVT Data sheet

Data Sheet

Check valve Type NRVT

For high pressure CO2 application

NRVT piston type check valves is designed for installation in discharge line to prevent refrigerant migration to protect compressor and enable the pressure equalization of rotary compressor before startup. In the meanwhile this valve can be used in other installation positions of CO2 systems such as hot gas and

suction lines.

Features:

• Stable operation covering full map of compressor

• Fullls high temperature and pressure requirements for the discharge lines used in Transcritical CO2 systems

◦ Rupture proof, optimized TIG welding ◦ Specially-selected sealing material for CO

refrigerant

• Hermetic brass body design

• Compatible to connect both copper/stainless steel tubes

• In compliance to PED & UL regulations

2

AI405623214680en-000101

GC

CCMT Light

AKVP

NRVT

EVT

Check valve, type NRVT

Applications

Typical applications for NRVT valves are:

• CO2 MiniPack

• CO2 CDU BLDC

Pressure Equalization/ Relief

• To start rotary BLDC compressors, it is necessary to equilize pressure between discharge and suction line.

• In single compressor solution it is possible to manage equalization via high pressure valve and bypass valve

• In system with parallel mounted compressors, It is necessary to install on each compressor check valve in

discharge line and solenoid valve to bypass high pressure to suction line

Figure 1: Pressure Equalization/ Relief

GC

CCMT

NRVT

AKVP

Check valve, type NRVT

Discharge line – compressors mounted in parallel

• If using an individual oil separator for each compressor – for protection against back condensation of refrigerantin the separator with the compressor shut-o.

• If the cylinder heads of the compressors can cool down below the condensing temperature at standstill

• Check valve for a common oil separator (installation position towards the condenser): – If there is a danger of back condensation from the condenser or liquid receiver – Systems with long shut-o periods

Figure 2: A diagram of Discharge line – compressors mounted in parallel

Liquid line

Suction line

Hot Gas line

Defrost drain line

Check valve, type NRVT

Hot Gas Defrost

Figure 3: A diagram of Hot Gas Defrost

Low Pressure lift Multi Ejector / cold & warm ambient temperature

Optimal solution for smaller commercial refrigeration systems

• In colder ambient conditions system operates as a standard booster system

• Ejector is simply controlling the high pressure as a high pressure valve according to the optimal COP Gas Cooler pressure algorithm

• Pressure in the receiver as pressure dierence between the receiver and Po-MT evaporator suction pressure

• Receiver pressure controlled by rst gas by-pass valve CCMT#1, second gas by-pass valve CCMT#2 is closed

• Check valve on MT evaporator suction line is open

• In warmer ambient conditions temperature out of the gas cooler is high and corresponding optimal pressure in gas cooler is high too, so ejector can lift all gas mass ow from MT evaporators through the ejector to the receiver

• Check valve in suction line between compressors and MT evaporators is closed due to pressure dierence

• The pressure in the receiver is result of the ejector performance.

• Both gas by-pass valves CCMT#1 & CCMT#2 are open to minimize pressure loses

• MT compressors are controlled based on Po-MT pressure sensor and Psuc-MT is protection

MT

LT

Psuc-MT

Po-MT

GC

CTM 6 LP

NRVT

CCMT#1

CCMT#2

Check valve, type NRVT

Figure 4: Low Pressure lift Multi Ejector / cold & warm ambient temperature

Technical data

Values

Refrigerants

R 744 (CO2)

Refrigerant oil

POE, PAG

Max. working pressure

140 bar / 2031 psig

Media temperature range

-40 °C – 150 °C / -40 °F – 302 °F

Flow direction

Single-ow

Valve direction

Sraightway

Serviceable

non-serviceable

Product engraving

Packaging label

M

a

d

e

i

n

U

S

A

020-6411

M

R

3

0

7

2

1

/

S

NRVT

TS/COT-40C TO 150C

PS 140BARDP/MAP2031PSIG

Information

Explanation

Danfoss

Danfoss Logo

NRVT

Product type

020-6411

Code number for ordering

PS 140 BAR DP/MAP 2031 PSIG

Max. working pressure

TS/COT -40°C TO +150°C

Media temperature range

MR

Place of manufacture

300721/S

Production date: DDMMYY/S (S: shift)

MADE IN USA

Country of origin

UL and EAC logos

Approval

Information

Explanation

Check valve

Product Description

NRVT

Product type

020-6411

Code number

R744

Refrigerant

Straightway

Direction

DN 3/8 in ODF

Connection

PS 140bar/MWP 2031psig

Max Working Pressure

Check valve, type NRVT

Product specication

Technical data

Table 1: 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 2: Box label & product label (example)

Table 3: Product engraving

Table 4: Packaging label

Information

Explanation

TS -40/+150°C -40/302°F

Media temperature range

MR

Place of manufacture

110122

Production date: DDMMYY

MADE IN USA

County of origin

Data Matrix

Content of traceability data matrix code (IDKey)

EAN code

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

Danfoss A/S, 6430 Nordborg, Denmark

Address

1

5

4

6

2

3

Position

Description

Material

1

Valve body

Brass2Piston

Brass3Spring

Stainless steel

4

Piston guide

Brass5Stop face

Brass6Tailpiece

Brass

Check valve, type NRVT

Design and materials

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

In NRVT check valve a sealing disc is activated by the spring to close or open the valve, and the force of the spring determines the Min. opening pressure. When the refrigerant ows through the valve and the dierential pressure of the ow is higher than the Min. opening pressure, the piston will move towards the stop face and compress the spring, then the valve will open.

Figure 5: Design and materials

Dimensions and Weights

You will nd downloadable dimension drawings for individual code numbers on Danfoss store as part of the Visuals tab for individual code numbers.

D

L

L1

Danfoss

64G8052

Type

Connection Size

Connection tol‐

erance

LL1øD

Net weight

Code no.

[in.]

[mm]

[kg]

NRVT 10s

3/8

-

-0.76/+0.76

110.5

8.6

26.4

0.2

020-6401

NRVT 10sH

0.35

020-6411

NRVT 12s

1/2-110.5

10.4

26.4

0.2

020-6402

NRVT 12sH

0.35

020-6412

NRVT 16s

5/8-132.1

12.7

34.9

0.35

020-6403

*

NRVT 16sH

0.35

020-6413

*

Check valve, type NRVT

Figure 6: Dimensions and Weights

 NOTE:

(*) 5/8 in. will be available in July, 2022

Valve type

Multi pack

Code no.

Solder ODF × ODF

Kv

Cv

Min. OPD Δp

Max.

working

pres‐ sure:

PS/MWP

Media temperature

range

PED cat‐

egory

Start open

Fully open

[in.]

[mm]

[m3/h]

[gal/min]

[bar]

[psi]

[bar]

[psi]

NRVT 10s

020-6401

3/8　1.20

1.39

0.01

0.15

0.05

0.73

140 bar /

2031 psig

-40 °C – 150 °C / -40 °F –302 °F

Art. 4.3

NRVT 12s

020-6402

1/2　2.10

2.44

NRVT 16s

020-6403*

5/8　4.80

5.57

NRVT 10sH

020-6411

3/8　1.20

1.39

0.25

3.63

0.9

13.05

NRVT 12sH

020-6412

1/2　2.10

2.44

NRVT 16sH

020-6413*

5/8　3.50

4.06

Check valve, type NRVT

Ordering

Table 5: Ordering



NOTE:

(*) 5/8 in. will be available in July, 2022

File name

Document type

Document topic

Approval authority

EAC Declaration

EAC

EAC RU

033F4003

Manufacturers Declaration

PED

Danfoss

033F4006

Manufacturers Declaration

China RoHS

Danfoss

033F4010

Manufacturers Declaration

RoHS

Danfoss

Mechanical - Safety Certicate

UL

Check valve, type NRVT

Certicates, declarations, and approvals

The list contains all certicates, declarations, and approvals for this product type. Individual code number may have some or all of these approvals, and certain local approvals may not appear on the list.

Some approvals may change over time. You can check the most current status at danfoss.com or contact your local Danfoss representative if you have any questions.

Certicates, declarations, and approvals

Table 6: Certicates, declarations, and approvals

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Danfoss NRVT Data sheet

Specifications and Main Features

Frequently Asked Questions

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