Page 252 - Softbound_Edition_19_en

BH4x4

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

DESCRIPTION APPLICATION
Direct operated spool valve, hand operated with 4 connections in 5 Spool valves are mainly used for controlling direction of movement
chamber design. Spool detented or with spring. Without actuation, and stopping of hydraulic cylinders and motors. The direction of
the spool is held in the center position by the spring (4/3), or movement is determined by the position of the spool and its symbol.
switched back to the offset position (4/2). With the detent, the Manually or mechanically operated valves are particularly suitable
spool is held in the last switching position selected. Precise spool for use in installations where no electric current is available or for
fit, low leakage, long service life time. Spool made from hardened applications in explosion hazard areas. Miniature values are used
steel, body from high quality hydraulic cast steel. where both, reduced dimensions and weight are important.

TYPE CODE

B H 4 / - #
Mounting interface acc. to Wandfluh standard
Hand lever

Number of control ports
Designation of symbols acc. to table Operation a-side …a
Operation b-side …b
Hand lever with spring reset or spring centred f
Hand lever dentented r

Sealing material NBR
FKM (Viton) D1

Design index (subject to change)
1.5-20

GENERAL SPECIFICATIONS HYDRAULIC SPECIFICATIONS
Designation 4/2-, 4/3-spool valve Working pressure p = 350 bar
max
Construction Direct operated Tank pressure p = 100 bar
T max
Mounting Flange construction Maximum volume flow Q = 20 l/min, see characteristics
max
Nominal size NG4-Mini according to Wandfluh
standard Leakage volume flow See characteristics
Actuation Hand operated Fluid Mineral oil, other fluid on request
Ambient temperature -25…+70 °C (NBR) Viscosity range 12 mm /s…320 mm /s
2
2
-20…+70 °C (FKM) Temperature range -25…+70 °C
Weight 0,87 kg fluid
MTTFd 150 years Contamination Class 20 / 18 / 14
efficiency
Filtration Required filtration grade ß 10…16 ≥ 75,
see data sheet 1.0-50

www.wandfluh.com Illustrations are not binding Data subject to change 1/4 Edition: 16 33 1.5-20 E