Fluid-controlled servo-arrangement

Details Fluid-controlled servo-arrangement Fluid-controlled servo-arrangement

F - Mech Eng,Light,Heat,Weapons

15

B

138/62

F15B 11/12 (2006.01) F15B 11/00 (2006.01) F15B 13/043 (2006.01)

Patent

CA 2007346

A B S T R A C T A fluid-controlled servo-arrangement is disclosed which comprises a piston-cylinder unit (21) having at least one pressure chamber (23, 23') influenced by the fluid, pressure generating means (25) for the fluid, a fluid tank (26) and a conduit (27, 27') between the pressure generating means (25) and the tank (26) containing in series a first valve (28, 28') on the pressure side and a second valve (29, 29') on the tank side, the pressure chamber (23, 23') being connected to a conduit section (30, 30') between the two valves (28, 29; 28', 29'). In known valve arrangements of this kind, there is the problem that, by reason of dead play required for the regulation, not every control signal corresponds to a definite piston position. Instead, the piston can wander about a particular predetermined desired value. The invention is intended to improve the setting accuracy so that every control signal will be associated with a specific piston position. This is achieved by providing a throttle (32, 32') in parallel with the first valve (28, 28'). Fig. 2

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