Data sheet
Non return valve NVD EF
Description
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.
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
Ordering |
Picture |
DN |
kVS |
PN |
Tmin |
Tmax |
Code No. |
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(m3/h) |
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(°C) |
(°C) |
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15 |
4 |
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065B8824 |
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20 |
8 |
25 |
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065B8825 |
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25 |
10.3 |
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−5 |
110 |
065B8826 |
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32 |
18 |
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065B8827 |
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40 |
24 |
18 |
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065B8828 |
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50 |
40 |
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065B8829 |
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Technical data
DN |
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15 |
20 |
25 |
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32 |
40 |
50 |
kVS |
m3/h |
4 |
8 |
10.3 |
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18 |
24 |
40 |
Nominal pressure |
PN |
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25 |
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18 |
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Medium |
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Circulation water / water with glycol up to 50 % |
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Medium temperature |
°C |
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−5 … 100 |
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Transport and storage |
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−30 … 100 |
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Min opening ∆p |
bar |
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0.02 |
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Connection type |
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Internal thread UNI ISO 228 |
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Materials |
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Body and threaded end |
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Brass CW617N |
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Pad |
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POM |
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Spring |
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AISI 302 |
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Seats |
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NBR |
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Mounting |
The valve can be mounted in all positions. |
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Flow must correspond with an arrow on the |
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body. |
© Danfoss | 2018.01 |
VD.BO.U1.02 | 1 |
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Data sheet |
NVD EF |
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Flow diagram
bar |
kPa |
daPa |
O |
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mm H |
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2 |
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2 |
200 |
20000 |
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10 |
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15 |
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0 |
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25 |
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32 |
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0 |
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50 |
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DN |
DN |
DN |
2 |
DN |
DN |
DN |
4 |
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N |
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D |
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1 |
100 |
10000 |
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0.5 |
50 |
5000 |
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0.2 |
20 |
2000 |
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0.1 |
10 |
1000 |
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0.05 |
5 |
500 |
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0.02 |
2 |
200 |
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0.01 |
1 |
100 |
100 |
200 |
500 |
1000 |
2000 |
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5000 |
10000 |
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20000 |
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50000 |
100000 |
200000 |
l/h |
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0.1 |
0.2 |
0.5 |
1 |
2 |
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5 |
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10 |
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20 |
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50 |
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100 |
200 |
mc/h |
Design
1.Threaded end
2.Washer
3.O-ring
4.Spindle
5.Spring
6.Body
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Dimensions
L
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DN |
G |
D |
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L |
Weight |
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(“) |
(mm) |
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(g) |
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15 |
½ |
32 |
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58 |
150 |
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20 |
¾ |
39 |
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65 |
225 |
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<![if ! IE]> <![endif]>G |
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<![if ! IE]> <![endif]>D |
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25 |
1 |
47 |
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75 |
330 |
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32 |
1 ¼ |
60 |
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80 |
545 |
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40 |
1 ½ |
67 |
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86 |
685 |
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50 |
2 |
83 |
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94 |
1025 |
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Danfoss 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 already on order provided that such alterations can be made without subsequential changes being necessary eady agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
2 | VD.BO.U1.02 |
© Danfoss | DHS-SRMT/SI | 2018.01 |