Multi-function valve

Details Multi-function valve Multi-function valve

1984-05-09

1986-10-21

Look, Edward K.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60452, 417217, 417222, F16D 3102

Patent

active

046177973

ABSTRACT:
A multi-function valve usable in a hydrostatic 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 makeup 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 differential 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 hydrostatic transmission, various controls are operable with flow in either direction to the motor through pressure lines between the pump and motor defining a closed loop circuit.

REFERENCES:
patent: 3327475 (1967-06-01), Clark et al.
patent: 3554214 (1971-01-01), Stenland
patent: 3585797 (1971-06-01), Moon
patent: 3820920 (1974-06-01), Klimaszewski et al.
patent: 3908519 (1975-09-01), Born et al.
patent: 4189921 (1980-02-01), Knapp
patent: 4468173 (1984-08-01), Dantlgraber
Circuit Drawings of Series 20 and Series 30 Pump-Motor Transmissions of Sundstrand Corporation, published prior to May 9, 1983.

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