Danfoss NVD EF Data sheet

Data sheet

Non return valve NVD EF

Description

Ordering

A check valve or non-return valve allows fluid to flow through it in only one direction. Its main function is to prevent any reverse flow of fluid in the installation.

Picture DN

15 4

20 8 065B8825

25 10. 3 065B8826

32 18

40 24 065B8828

50 40 065B8829

(m3/h) (°C) (°C)

Valve is used in water systems (sanitary, industrial and agricultural), heating and thermic systems (radiators, boilers, pumps).

Features:

• Limited Headlosses

• Full bore

• Ideal tightness at low and high pressure

Main data:

• DN 15-50

• kVS 4-40 m3/h

• PN 25 and 18

• Medium: Circulation water / water with glycol up to 50 %

• Medium temperature −5 … 110 °C

min

−5 110

max

Code No.

065B8824

065B8827

Technical data

DN 15 20 25 32 40 50

Nominal pressure PN 25 18

Medium Circulation water / water with glycol up to 50 %

Medium temperature

Transport and storage −30 … 100

Min opening ∆p bar 0.02

Connection type Internal thread UNI ISO 228

Materials

Body and threaded end Brass CW617N

Pad POM

Spring AISI 302

Seats NBR

m3/h 4 8 10. 3 18 24 40

°C

Mounting The valve can be mounted in all positions.

Flow must correspond with an arrow on the body.

−5 … 100

VD.BO.U1.02 | 1

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Data sheet NVD EF

bar

0.05

0.02

0.01

kPa

daPa

0.10.2 0.51 2510 20 50 100 200 mc/h

Flow diagram

200

100

0.5

0.2

0.1

mm H2O

20000

10000

5000

2000

1000

500

200

100

100 200 500 1000 2000 5000 10000 20000 50000 100000 200000 l/h

DN 10

DN 25

DN 32

DN 20

DN 15

DN 40

DN 50

Design

1. Threaded end

2. Washer

3. O-ring

4. Spindle

5. Spring

6. Body

Dimensions

⑥ ⑤

④

③

②

①

D L

(“)

15 ½ 32 58 150

20 ¾ 39 65 225

25 1 47 75 330

32 1 ¼ 60 80 545

40 1 ½ 67 86 685

50 2 83 94 1025

(mm)

Weight

(g)

oss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products

vided that such alterations can be made without subsequential changes being necessary eady agreed.

2 | VD.BO.U1.02