Danfoss Electronics NRVA Catalog Page

Shut-off and regulating valves

Check valves

for Industrial Refrigeration

Type NRVA

Check valve type NRVA can be used in liquid, suction and hot gas lines in refrigeration and air conditioning plant with ammonia.

NRVA can also be used in refrigerating systems with ﬂuorinated refrigerants.

When the NRVA is used in liquid lines where cold, thick oil or impurities may be present, it is recommended that the standard spring be replaced by a special spring. See ordering table.

Features • Ensures correct direction of ﬂow.

• Valve housing made of steel.

• Available for 40 bar g / 580 psig working pressure.

• Large range of ﬂanges with connection dimensions in accordance with standards: DIN, ANSI, SOC, SA and FPT.

Design

Connections

There is a very wide range of connection possibilities with NRVA check valves:

• Welding, DIN (2448)

• Welding, ANSI (B 36.10)

• Welding socket, ANSI (B 16.11)

• Solder connection, DIN (2856)

• Solder connection, ANSI (B 16.22)

• FPT internal thread, NPT (ANSI/ASME B 1.20.1)

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

• Classiﬁcation: DNV, CRN, BV, EAC etc. To get an updated list of certiﬁcation on the products please contact your local Danfoss Sales Company.

Gaskets:

Do not contain asbestos.

Valve cone:

The valve cone has a teﬂon tightening ring. Teﬂon tightening ring renders perfect sealing at a minimum closing force.

AF251686497757en-001012 | 43

Check valves, type NRVA

Technical data • Refrigerants

Applicable to HCFC, HFC and R717 (Ammonia). For further information please see installation

• Pressure range The valve is designed for: Max. working pressure: 40 bar g / 580 psig.

instruction for NRVA. Use with ﬂammable hydrocarbons cannot be recommended; please contact Danfoss.

• Temperature range

-50 – 140 °C / -58 – 284 °F.

Material speciﬁcation

Material speciﬁcation for NRVA check valves

No. Part Material DIN ISO ASTM

1 Housing Steel G20Mn5QT *)

2 Flanges Steel RSt. 37-2, 10025 Fe360 B, 630 Grade C, A 283

3 Valve cone Stainless steel

Teﬂon

5 Spring Steel

9 Bolts Stainless steel A2-70

10 Nut Stainless steel

11 Gasket Non asbestos

12 Valve seat Steel

*) NRVA 40 / NRVA 50 housing material is TTSt 35N until January 2006

EN10213-3

--------------------------------------P285QH EN10222-4

LCC, A352

--------------------------------------LF2,A350

Ordering

44 | AF251686497757en-001012

Complete valves incl. DIN 2448 ﬂange:

Weld ﬂange

Type

NRVA 15

NRVA 20

NRVA 25 1 020-2002 020-2317 0.12 1.7 0.3 4.4 19 22

NRVA 32 1 1⁄4 020-2003 020-2317 0.12 1.7 0.3 4.4 20 23

NRVA 40 1 1⁄2 020-2004 020-2327 0.07 1.0 0.4 5.8 44 51

NRVA 50 2 020-2005 020-2327 0.07 1.0 0.4 5.8 44 51

NRVA 65 2 1⁄2 020-2006 020-2337 0.07 1.0 0.4 5.8 75 87

) A special type spring can be supplied to replace the standard valve spring.

) Dp = the minimum pressure diﬀerential at which the valve is completely open.

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

) The Cv value is the ﬂow of water in gal/min at a pressure drop across valve of 1 psig, ρ = 10 lbs/gal.

connection

[in] [bar[ [psig] [bar] [psig] [m3/h] [gal/min]

⁄2 020-2000 020-2307 0.12 1.7 0.3 4.4 5 6

⁄4 020-2001 020-2307 0.12 1.7 0.3 4.4 6 7

Valve body without ﬂanges:

Type Code no.

NRVA 15 020-2020

NRVA 20 020-2020

NRVA 25 020-2022

NRVA 32 020-2022

NRVA 40 020-2024

NRVA 50 020-2024

NRVA 65 020-2026

Code no. Dp 2)

Valve Spec. spring 1)

standard spring

Staybolts and gaskets

Type Dimensions Code no.

NRVA 15 / 20 M 12 × 115 mm 006-1107

NRVA 25 / 32 M 12 × 148 mm 006-1135

NRVA 40 / 50 M 12 × 167 mm 006-1137

NRVA 65 M 16 × 200 mm 006-1138

With

spec. spring 1)

kv value 3) Cv value 4)

Check valves, type NRVA

Flange connections Danfoss ﬂange sets excluding gaskets, bolts and

nuts, are specially made for the Danfoss product range and must only be used for the purpose described.

Size

DIN

ANSI

Size

[mm]

[in]OD[mm]T[mm]OD[in]T[in]

Butt welding DIN (2448)

⁄8 18 2 0.710 0.079 1.3 NRVA 15/20 027N1112

⁄2 22 2.5 0.866 0.098 1.3 NRVA 15/20 027N1115

⁄4 26.9 2.3 1.059 0.091 1.3 NRVA 15/20 027N1120

25 1 33.7 2.6 1.327 0.103 4 NRVA 25/32 027N1026

32 1 1⁄4 42.4 2.6 1.669 0.102 4 NRVA 25/32 027N1033

40 1 1⁄2 48.3 2.6 1.902 0.103 6 NRVA 40/50 027N1042

50 2 60.3 2.9 2.370 0.110 6 NRVA 40/50 027N1051

65 2 1⁄2 76.1 2.9 3.000 0.110 8 NRVA 65 027N1055

Size

[mm]

[in]OD[mm]T[mm]OD[in]T[in]

Butt welding ANSI B 36.10

⁄8 17.2 3.2 0.677 0.126 1.3 NRVA 15/20 027N2020

⁄2

25 1 33.7 4.6 1.327 0.181 4 NRVA 25/32 027N2023

32 1 1⁄4 42.4 4.9 1.669 0.193 4 NRVA 25/32 027N2024

40 1 1⁄2 48.3 5.1 1.902 0.201 6 NRVA 40/50 027N2025

50 2 60.3 3.9 2.370 0.150 6 NRVA 40/50 027N2026

65 2 1⁄2 73.0 5.2 3.000 0.200 8 NRVA 65 027N2027

21.3 3.7 0.839 0.146 1.3 NRVA 15/20 027N2021

⁄4 26.9 4.0 1.059 0.158 1.3 NRVA 15/20 027N2022

Flange

Select the valve based on capacity and then select the size of ﬂanges most suitable for the application, which can be mounted on the valve.

For use with valve housing size Code no.

type

For use with valve housing size Code no.

type

SOC

Size

[mm]

Size

[in]ID[mm]T[mm]ID[in]T[in]L[mm]L[in]

Flange

type

For use with valve housing size

Code no.

Socket welding ANSI (B 16.11)

⁄8 17.8 4.1 0.701 0.161 10 0.394 1.3 NRVA 15/20 027N2010

⁄2 22 4.8 0.866 0.189 10 0.394 1.3 NRVA 15/20 027N2011

⁄4 27.4 5.0 1.079 0.197 13 0.512 4 NRVA 25/32 027N2012

25 1 34.1 5.8 1.343 0.228 13 0.512 4 NRVA 25/32 027N2013

32 1 1⁄4 42.9 6.0 1.689 0.236 13 0.512 4 NRVA 25/32 027N2016

40 1 1⁄2 49.0 6.5 1.929 0.254 13 0.512 6 NRVA 40/50 027N2015

Size

[mm]

Size

[in]ID[mm]

[in]

[mm]L[in]

Flange

type

For use with valve housing size

Code no.

Soldering DIN (2856)

16 16.07 15 1.3 NRVA 15/20 027L1116

22 22.08 22 1.3 NRVA 15/20 027L1122

35 35.07 25 4 NRVA 25/32 027L2335

54 54.09 33 4 NRVA 40/50 027L2554

Soldering (ANSI B 16.22)

5⁄8 0.628 0.807 1.3 NRVA 15/20 027L1117

7⁄8 0.878 0.866 1.3 NRVA 15/20 027L1123

1 3⁄8 1.375 0.984 4 NRVA 25/32 027L2335

2 1⁄8 2.125 1.300 4 NRVA 40/50 027L2554

To be continued next page.

AF251686497757en-001012 | 45

Check valves, type NRVA

Flange connections

(Continued)

FPT

Dimensions and weights

Size

[mm]

Size

Inside pipe thread

[in]

Flange

type

For use with valve housing size

Code no.

FPT inside pipe thread, NPT (ANSI/ASME B 1.20.1)

10 3⁄8 ( 3⁄8 × 18 NPT) 1.3 NRVA 15/20 027G1005

⁄2 (1⁄2 × 14 NPT) 1.3 NRVA 15/20 027G1006

⁄4 (3⁄4 × 14 NPT) 4 NRVA 25/32 027G1007

Example

NRVA 32 with 1 1⁄4" ﬂanges for ANSI butt welding:

NRVA 32 + bolts + ﬂanges (set) = 020-2022 + 006-1135 + 027N2024

NOTE: The ﬂanges sets are exclusive gaskets, bolts and nuts.

Type L L

115 50 80 1.4 kg

NRVA 15 – 20

NRVA 25 – 32

NRVA 40 – 50

NRVA 65

) Without ﬂanges

[mm] [in]

4.53 1.97 3.15 3.09 lb

138 74 ∅ 83 3.0 kg

[mm] [in]

5.43 2.91 ∅ 3.27 6.61 lb

172 94.5 ∅ 103 5.0 kg

[mm] [in]

6.77 3.72 ∅ 4.05 11.02 lb

[mm]

226 124 ∅ 185 13.0 kg

8.90 4.88 ∅ 7.28 28.66 lb

[in]

) B Weight

46 | AF251686497757en-001012

Danfoss Electronics NRVA Catalog Page

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