Remote hydraulic control systems

Details Remote hydraulic control systems Remote hydraulic control systems

1993-03-29

1994-05-24

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

251 29, F15B 13042

Patent

active

053139836

ABSTRACT:
Response times for a remote hydraulic control system having control lines from a remote controller to a main control valve of 50 feet or more are reduced by providing actuator pistons which are operated at a second pilot hydraulic pressure less than a first pilot hydraulic pressure used for moving a valve spool within the main control valve. The actuator pistons open valves which allow hydraulic fluid at the higher pilot pressure to push the valve spool. "Off" times are further reduced by continuously bleeding off a portion of the hydraulic fluid applied to the actuator pistons at the second hydraulic pressure.

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patent: 3340897 (1967-09-01), Nevulis
patent: 3557829 (1971-01-01), Finley
patent: 3805674 (1974-04-01), Sebesta et al.
patent: 4024798 (1977-05-01), Schexnayder et al.
patent: 4044795 (1977-08-01), Tardy et al.
patent: 4354527 (1982-10-01), McMillan
patent: 4355660 (1982-10-01), Huffman
patent: 4730543 (1988-03-01), Holmes
patent: 5081905 (1992-01-01), Yagyu et al.

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