Pilot-operated valve structure

Details Pilot-operated valve structure Pilot-operated valve structure

1977-09-16

1979-03-27

Geoghegan, Edgar W.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

91521, 13759614, 13762566, 91461, F15B 1116, F15B 1306

Patent

active

041459571

ABSTRACT:
A pilot-operated valve structure for controlling high pressure fluid flow relative to a pair of cylinders, each having an extend port and a retract port. The valve structure has a pair of pilot-operated 3-way valves, each with a poppet valve member and with pilot valve structure including pilot lines directed to the 3-way valves and to the retract ports of the cylinders. The pilot valve has multiple positions including a neutral position whereby pilot pressure may be directed to the 3-way valves for positioning thereof and to the retract ports of the cylinder for holding the pistons in the cylinders retracted or causing retraction of a piston of an extended cylinder. Two alternate positions of the pilot valve cause positioning of one or the other of the 3-way valves to cause extension of the piston in the associated cylinder while the piston in the other cylinder is maintained in retracted position.

REFERENCES:
patent: 2390425 (1945-12-01), Crum
patent: 2880708 (1959-04-01), Hayner
patent: 3016917 (1962-01-01), Hunt
patent: 3129645 (1964-04-01), Olmsted
patent: 3162212 (1964-12-01), Leding
patent: 3220318 (1965-11-01), McGuire
patent: 3358964 (1967-12-01), Cohen et al.
patent: 3376792 (1968-04-01), Clarke et al.
patent: 3934610 (1976-01-01), Solie

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