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US 3,938,543 AGranted
Fluid control system
OwnerGerald T. Sorensoninventor
Life of this patent
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Abstract
Fluid control systems for controlling machine tool operations or other automated mechanical devices. An unlimited number of multiple function systems can be assembled from a basic simple function system employing two-way relay valves which, in their normally blocked state, have a "controlled leakage" venting feature effective to prevent any leakage to outlet and possible system malfunction. Fluid memory can also be built in the system. Simple relay valves, limit valves, pressure control relay valves, time delay relay valves and other variations in spool and slide form provide controlled leakage.
Claims11
A fluid control system, comprising:
- a source of fluid under pressure,
- first and second pilot operated relay valves each having a pilot port for receiving fluid under pressure from said source to operate the relay valve,
- first valve means in its blocked state connected between said source and said pilot port of said first relay valve,
- said first valve means including vent means effective to vent fluid under pressure from said source which would otherwise leak through said valve to said pilot port while said first valve means is in its blocked state,
- actuating means for changing the state of said first valve means to a passing state,
- second valve means in its blocked state connected between exhaust means and said pilot port of said first relay valve,
- actuating means for changing the state of said second valve means to a passing state,
- said first relay valve having at least one pair of inlet and outlet control ports normally in the blocked state, with the inlet port connected to the source of fluid and the outlet port operably connectable to the pilot port of the second pilot operated relay valve, and
- said first relay valve including vent means effective to vent fluid under pressure from said source which would otherwise leak through said valve to said outlet port while said control ports are in the normally blocked state.
6 more elements
Dependencies are inferred from the claim text.