Page 285 - Softbound_Edition_19_en

BK4x4
Spool valve

Spool valve
NG4-Mini
Flange construction
◆ pneumatically operated
◆ 4/2-way impulse valve
◆ 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, pneumatically operated, with 4 Spool valves are mainly used for controlling direction of movement
connections in a 5 chamber system. Spool detented or with spring. and stopping of hydraulic cylinders and motors. The direction of
Without actuation, the spool is held in the center position by the movement is determined by the position of the spool and its symbol.
spring (4/3), or switched back to the offset position (4/2). With the Miniature values are used where both, reduced dimensions and

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 Z41a Z41b
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 Z42a Z42b
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

D43 Z43a Z43b
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
D44 Z44a Z44b
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

D45 Z45a Z45b
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

www.wandfluh.com Illustrations are not binding Data subject to change 1/3 Edition: 16 29 1.6-20 E
Page 285