Multi-function valve

Details Multi-function valve Multi-function valve

F - Mech Eng,Light,Heat,Weapons

15

B

138/41.11

F15B 7/00 (2006.01) F16H 61/40 (2006.01) F16H 61/42 (2006.01)

Patent

CA 1254814

BO1909 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 moveable 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.

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