Fluid handling – Systems – Supply and exhaust
Patent
1975-12-29
1978-04-11
Cohen, Irwin C.
Fluid handling
Systems
Supply and exhaust
91461, 13759616, F15B 13043
Patent
active
040833810
ABSTRACT:
A control valve for controlling flow relative to a pair of control ports which includes a pair of 3-way valve components each having one of the control ports and a poppet valve member which, when closed in one position under pilot control, blocks pressure flow to a control port and connects the control port to reservoir, a pressure-reducing valve which initially operates to supply a relatively low pressure pilot fluid to a pilot control for the 3-way valves and, after operation of the latter, permit full line flow through a pair of branch passages each having a one-way check valve preventing return flow. Operation of the pilot control from a neutral position shifts one of a pair of pilot pistons associated one with each of the 3-way valves to move the poppet valve member of the associated 3-way valve to a position to close off the control port from line pressure and connect the same control port to reservoir and with line flow passing through a nonpiloted check valve to the other of said 3-way valves to the control port. The pilot control has a neutral control position wherein neither of the pilot pistons are actuated, with the result that each of the 3-way valves has its valve spool normally urged to a position closing off the pair of control ports from reservoir whereby, with the return flow blocked by a pair of non-piloted check valves, flow to and from said control ports is blocked and an operated device, such as a hydraulic cylinder, is locked in 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
Boers Jan H.
McClocklin Samuel B.
Solie James C.
Cohen Irwin C.
Owatonna Tool Company
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