Automatic flow control valve with variable set-points
Patent 5967176 Issued on October 19, 1999. Estimated Expiration Date: 
April 17, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 17, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 843174 1157957 1228104 2059121 2309848 2646064 3542052 Valves Automatic control valve for a fluid system Pilot controlled membrane valve InventorsApplicationNo. 062429 filed on 04/17/1998US Classes:137/489.5, Pilot controls supply to pressure chamber137/488, Fluid pressure type137/489Choked or throttled pressure typeExaminersPrimary: Ferensic, Denise L.Assistant: Kim, Joanne Y. Attorney, Agent or FirmInternational ClassesF16K 031/12F16K 031/365 AbstractThe invention provides a pilot valve apparatus for use in an automatic fluid control system for maintaining pressure downstream from a main control valve between two setpoints irrespective of flow changes through the main control valve. The pilot valve has a flexible pilot diaphragm which moves with a moveable pilot valve member to cooperate with a fixed pilot valve member to control fluid flow through the pilot valve apparatus. The pilot valve controls control pressure acting on the main control valve. An actuator apparatus connected to a body of the pilot valve apparatus has a moveable actuator partition which is exposed to a pressure differential signal reflecting flow through the main control valve. A resilient connector cooperates with the actuator partition and the pilot diaphragm to permit limited relative movement therebetween, and to transfer resilient force to the pilot diaphragm resulting from movement of the actuator partition. This transfer varies location of the moveable pilot valve member with respect to the fixed pilot valve member to vary flow through the pilot valve apparatus, so as to vary control pressure, which in turn controls the main control valve. An adjustable actuator stop can cooperate with the actuator partition to limit movement of the actuator partition. An actuator resilient member can cooperate with the actuator partition to apply a force selectively to the actuator partition to resist displacement thereof.Other References
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