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| Number | Title | Issue Date |
| 6705339 | Surge check unit for a liquid distribution system A safety check unit for use in a liquid distribution system for preventing damage to a pump and associated components of the system in event of loss in pumping pressure. The unit provides a check component to prevent back-flow of the liquid when the pump is shut dow... | 03/16/2004 |
| 6517325 | Air compressor and method of operating the same An air compressor comprises a compressor main body, and a capacity adjusting apparatus connected to an intake side of the compressor main body for adjusting the intake air flow into the compressor main body. The capacity adjusting apparatus is provided in... | 02/11/2003 |
| 6443175 | Vacuum pressure generator circuit with non-volitile memory function The present invention is a pressure feedback circuit for use with a vacuum pressure control circuit. The pressure feedback circuit detects the occurrence of, and controls the generation of vacuum pressure under, External Override Conditions ("EOCs"). Duri... | 09/03/2002 |
| 5228473 | Internal safety valve system An internal valve and metered positive displacement pump for a pressure fluid tank. The tank defines a fluid compartment, and first and second vessels are positioned within the protective envelope of the tank. A bellows pump assembly disposed in the first... | 07/20/1993 |
| 4366834 | Back-flow prevention valve A back-flow prevention valve assembly is disclosed for use with a vacuum pump or the like and employs a valve element movable between positions opening or closing a passageway through the assembly. In the event of pump failure, a control valve, which is o... | 01/04/1983 |
| 4135550 | Pinch valve control circuit A control circuit is disclosed for a sleeve-type pinch valve and which control circuit utilizes an internal vacuum condition in a main supply line in which the valve is disposed to retain the elastomeric sleeve of the valve open. A check valve is provided... | 01/23/1979 |
| 4062379 | Safety valve control system for production well In a safety system for controlling the closing of a primary valve in response to an indication of an undesirable condition from a monitoring device, the system including a valve arrangement which supplies operating fluid to the primary valve and an operat... | 12/13/1977 |
