Page 301 - Softbound_Edition_19_en

BP4x4
Spool valve

Spool valve
NG4-Mini
Flange construction
◆ hydraulically operated
◆ 4/2-way impulse execution detented
◆ 4/3-way with spring centred mid position
◆ 4/2-way with spring reset
◆ Q = 20 l/min
max
◆ p = 350 bar
max

DESCRIPTION APPLICATION
Direct operated spool valve hydraulically operated via pilot port Spool valves are mainly used for controlling direction of movement
with 4 connections in a 5 chamber system. Spool detented or with and stopping of hydraulic cylinders and motors. The direction of
spring. Without actuation, the spool is held in the center position by movement is determined by the position of the spool and its symbol.
the spring (4/3), or switched back to the offset position (4/2). With Miniature values are used where both, reduced dimensions and

the detent, the spool is held in the last switching position selected. weight are important.
Precise spool fit, low leakage, long service life time. Spool made

from hardened steel, body from high quality hydraulic cast steel.
SYMBOL

J40 Z40a Z40b
A B A B A B

a a b b a a b b a a b b
P T P T P T
D41 D41* D41*
A B A B A B

a a 0 b b a a b b a a b b
P T P T P T
D42 D42* D42*
A B A B A B
0 b a
a a b b a a b a b b
P T P T P T

* These 4/2-way valves with spring reset are being delivered as 4/3-way valves.
Note! When the pilot ports are not actuated (without
pressure), or not needed, the leakage oil must be
discharged.

www.wandfluh.com Illustrations are not binding Data subject to change 1/3 Edition: 21 30 1.7-20 E
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