Hydraulic control instrumentality

Details Hydraulic control instrumentality Hydraulic control instrumentality

1972-07-19

1979-02-13

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91420, 91436, 91446, 91452, F15B 1308

Patent

active

041390210

ABSTRACT:
Instrumentality for use in multiple spool control valve assemblies including a high pressure pilot operated relief valve that exhausts fluid from the chamber being protected through a pair of exhaust passages simultaneously. A pressure responsive flow restricting valve maintains a constant pressure differential on the control spools across the open center flow passages of open center valves. A low pressure regeneration circuit includes provisions for preventing excessive pressure and consequent seal blow-out in the return passages of a control valve assembly. Each of these instrumentalities is capable of being disposed in an end plate section of universal configuration for section control valve asssemblies.

REFERENCES:
patent: 2651324 (1953-09-01), Hodgson et al.
patent: 3527328 (1970-09-01), Maurice
patent: 3613711 (1971-10-01), Wilke
patent: 3718159 (1973-02-01), Tennis

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