Fluid pressure system and value therefor
AssigneeMassey-Ferguson Services N.V.
InventorWalter Schneider
Life of this patent
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Abstract
A fluid pressure system incorporating a piston and cylinder actuator which is initially moved from right to left and is reversed at the left hand end of its stroke by a switching valve upon receiving a signal through a passage from a sensing valve which becomes hydraulically balanced during a no-flow condition of the system and is displaceable to a switch initiating state during that condition by a small force originating from a light spring, or the actuator or from the operation of another valve in the system.
Claims15
A fluid pressure system including at least one fluid pressure motor and fluid pressure valve means connected thereto wherein said valve means includes a switching means for redirecting flow of pressure fluid to the motor and sensing means constituted by a sensing valve capable of taking up a stable operating position or a switch initiating position characterised in that said sensing valve becomes hydraulically balanced when the flow therethrough is zero and is displaceable to a switch initiating position on application of a small force thereto.
For use in a fluid pressure system containing a fluid pressure motor and connected thereto fluid pressure valve means incorporating a sensing valve, a switching valve and a pressure fluid signalling connection therebetween characterized in that said sensing valve, during operation, is adapted to become hydraulically balanced when there is no flow through the sensing valve, and to receive a bias from within the fluid pressure system and on moving to a switch initiating position, in response to said bias, to cause, through said signalling connection, said switching valve to operate.
Dependencies are inferred from the claim text.