This range of bolt on valves offers very sensitive speed and directional control. One frictionless matched spool and sleeve assembly is offered with two alternative means of actuation.
Peak power 4 kW (5.5 HP) Performance data
As standard these valves can be supplied with either EQUAL POWER or BIASED POWER spools, the latter is suitable for hoisting applications (normal power for lifting - reduced power for lowering).
The direction of reduced power must be stated when ordering CW or CCW, when viewed on the output shaft of the motor or geared motor.
The brake module bolts directly onto the motor mounting face and has exactly the same interface as the motor. As shown in the drawing below, the brake consists of two spring-applied shoes pressed against a central hub. These shoes are released by applying air pressure to the cylinder/piston assembly. The brake torque can be varied by means of two spring adjusters but it is normally set so that a pilot pressure of 4.1 bar/60 psi will fully release it. Pressures below this level will progressively reduce the braking torque available. The brakes are set at the plant but it may be necessary to make adjustments onsite to suit the individual application.
Maximum performance details listed below are at 6 bar/90 psi. A typical minimum gearbox efficiency of 90% can be expected. The maximum overhung force is assumed acting midway along the output shaft.
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