Page 1343 - Softbound_Edition_19_en

Check valve
Check valves

Non-return valve
hydraulic pilot ®
Sandwich construction NG3-mini
• Q max = 8 l/min
• p = 315 bar
max

deScriptioN fuNctioN applicatioN
Sandwich type non-return valve NG3-Mini with In the free flow direction, the volume flow opens Pilot operated non-return valves are used to
hydraulic pilot with interface according to Wand- the valve seat against a spring. The spring shut off pressurised hydraulic cylinders, e.g.
fluh standard. The valves allow a free flow in one helps the valve close in the opposite direction. in lifting or clamping fixtures, without leaking.
direction and shut off in the opposite direction. If pressure builds up in the opposite oil port, The hydraulic cylinder can only be moved
3 different standard versions are available. The this displaces the pilot piston and opens the in the shut off direction if a directional valve
steel sandwich body is phosphatised. Good non-return valve of the closed port. The pilot directs the volume flow into the opposite port
performance data and attractive design are the pressure required is dependet on the pressure and releases the valve. Reliability in operation
hall marks of this quality product. held by the valve seat. is increased be a directional valve which con-
nects both oil ports to the tank in the neutral
position. Sandwich type elements NG3 mean
that the system is highly flexible and save both
space and weight.

type code
B 3 #
Mounting interface acc. to Wandfluh standard

Type list / Function
in A and B DERV
in A ERVA in B ERVB
Nominal size 3-Mini

Design-Index (Subject to change)

GeNeral SpecificatioNS Hydraulic SpecificatioNS
Description Non-return valve hydraulic pilot Fluid Mineral oil, other fluid on request
Nominal size NG3-Mini acc. to Wandfluh standard Contamination efficiency ISO 4406:1999, class 20/18/14
Construction Sandwich construction (Required filtration grade ß 10…16≥75)
Mounting 3 holes for hexagon socket screw M4 refer to data sheet 1.0-50/2
or studs M4 Viscosity range 12 mm /s…320 mm /s
2
2
Connections Connection plates Fluid temperature -20…+70 °C
Multi-station flange subplate Peak pressure p max = 315 bar
Longitudinal stacking system Opening pressure p = 2 bar
ö
Ambient temperature -20…+50 °C Pilot ratio i = 1:8
Mounting position any Max. volume flow Q max = 8 l/min
Fastening torque M = 2,8 Nm (Quality 8.8)
D
Weight m = 0,56 kg
SymbolS / typeS
BDERV3 BERVA3 BERVB3

A P T B A P T B A P T B

Wandfluh AG Tel. +41 33 672 72 72 E-mail: sales@wandfluh.com Illustrations not obligatory Data sheet no.
Postfach Fax +41 33 672 72 12 Internet: www.wandfluh.com Data subject to change 2.7-65E 1/2
CH-3714 Frutigen Edition 03 26
Page 1343
∅ 4,2 20 10

30

6,5 94 6,5

40 30
Thickness = 1,2
Dicke = 1,2
Epaisseur = 1,2

P
21 11 T A B To 30

10
20