Danfoss NVD EF Data sheet

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.
			(m3/h)		(°C)	(°C)
		15	4				065B8824
		20	8	25			065B8825
		25	10.3		−5	110	065B8826
		32	18				065B8827
		40	24	18			065B8828
		50	40				065B8829

Technical data

DN		15	20	25		32	40	50
kVS	m3/h	4	8	10.3		18	24	40
Nominal pressure	PN		25				18
Medium			Circulation water / water with glycol up to 50 %
Medium temperature	°C				−5 … 100
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

Mounting	The valve can be mounted in all positions.
	Flow must correspond with an arrow on the
	body.

© Danfoss | 2018.01

VD.BO.U1.02 | 1

Data sheet	NVD EF

Flow diagram

bar	kPa	daPa	O
		mm H
		2
2	200	20000						10		15			0		25		32			0			50
							DN		DN		DN	2		DN		DN		DN	4			N
																					D
1	100	10000
0.5	50	5000
0.2	20	2000
0.1	10	1000
0.05	5	500
0.02	2	200
0.01	1	100	100	200	500	1000	2000		5000		10000					20000					50000			100000	200000	l/h
			0.1	0.2	0.5	1	2		5		10					20					50			100	200	mc/h

Design

1.Threaded end

2.Washer

3.O-ring

4.Spindle

5.Spring

6.Body

Dimensions

L

																				DN	G	D		L	Weight
																					(“)	(mm)			(g)
																				15	½	32		58	150
																				20	¾	39		65	225
															<![if ! IE]> <![endif]>G		<![if ! IE]> <![endif]>D			25	1	47		75	330
																				32	1 ¼	60		80	545
																				40	1 ½	67		86	685
																				50	2	83		94	1025

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