Double acting pilot valve

Details Double acting pilot valve Double acting pilot valve

1983-05-09

1985-01-01

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762526, 13762568, F15B 13042

Patent

active

044911548

ABSTRACT:
A pilot valve adapted for connection between a double acting fluid actuator (12) of the piston-type and a hydraulic fluid supply (21). The pilot valve comprises an elongate body (30) with an axial bore (32, 33) therethrough and a piston chamber (38) at one end of the valve body. A valve plunger (49) affixed to the piston (50) in the piston chamber (38) is mounted in the axial bore for movement between first and second operating positions in response to the selective application of pneumatic pressure to the piston (50). The valve (20) is provided with valve ports (56, 60) for accommodating connections with a hydraulic fluid reservoir (21), and a piston-type actuator (12), respectively, whereby in the first operative position of the valve plunger (49), the valve (20) is conditioned for the transmission of hydraulic fluid to a first side of the actuator piston (17) and the removal to the sump (22) of hydraulic fluid from the other second side of the actuator piston (17) through valve ports (81, 75). In the second operative of the valve plunger (49), the valve is conditioned for the transmission of hydraulic fluid to the second side of the actuator piston (17) through the valve ports (83, 81) and the removal of hydraulic fluid from the first side of the actuator piston (17) to the sump through valve ports (81, 75). In the first operative position, internal passage means (57, 58, 59) in the plunger establish communication between the reservoir (21) and the first side of the actuator piston for transmission of fluid thereto and second internal passage means (77, 78, 79) establish communication between the second side of the actuator and the sump.

REFERENCES:
patent: 3706322 (1972-12-01), Carlson
patent: 3744523 (1973-07-01), Hill
patent: 4187884 (1980-02-01), Loveless
patent: 4209040 (1980-06-01), Peters

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