Multi-function valve

Details Multi-function valve Multi-function valve

F - Mech Eng,Light,Heat,Weapons

16

H

138/41.11

F16H 39/04 (2006.01) F16H 61/40 (2006.01) F16H 61/42 (2006.01)

Patent

CA 1255995

MULTI-FUNCTION VALVE Abstract A multi-function valve usable in a hydro- static transmission and having valve components mounted in a single valve body to provide pressure limiter and high pressure relief functions and with the structure also providing a bypass function and for supply of make- up fluid to the hydrostatic transmission. The multi- function valve has a charge check valve member and a relief valve member in associated relation and movable upon the occurrence of a predetermined pressure dif- ferential thereacross to perform control functions. One pressure differential results from a flow through an orifice and with the flow being controlled by a poppet valve member normally held closed by a heavy spring which establishes a system pressure at which the pressure limiter function will occur. With this structure, the pressure limiter function occurs in advance of the high pressure relief function and under the control of a single heavy spring. With two of the multi-function valves utilized with the hydrosratic transmission, various con- trols are operable with flow in either direction to the motor through pressure lines between the pump and motor defining a closed loop circuit.

578899

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