Flow control valve
Patent 4694848 Issued on September 22, 1987. Estimated Expiration Date: 
October 24, 2005. 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.
October 24, 2005. 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 549407 1539630 2770799 2897836 3047003 3212525 3762430 Relief valve assembly for use with backflow preventers Pneumatic control valves with diaphragm actuators and modular body structure Patent #: 4615353 InventorsApplicationNo. 06/790956 filed on 10/24/1985US Classes:137/114, One inflow supplements another137/312, WITH LEAKAGE OR DRIP COLLECTING137/625.4, Multiple inlet with single outlet137/625.5, Plural disk or plug251/335.2, Diaphragm251/61.3Valve between coaxial spring biasing means and actuatorExaminersPrimary: Michalsky, Gerald A.Attorney, Agent or FirmInternational ClassesF16K 37/00 (20060101)F16K 31/122 (20060101) AbstractA direct acting flow control valve operative by an actuator responsive to fluid pressure from an external source. The actuator includes a pair of spaced apart pistons and associated rolling diaphragms which define an actuator chamber into which the fluid pressure is admitted, and a separate leakage chamber into which fluid will pass on leaking through a defective diaphragm, the leakage chamber being adapted for communication with an external indicator, shutoff valve or the like.Other References
Field of SearchFlexible wall expansible chamber reciprocating valve actuatorFlexible wall valves fluid Coaxial actuator, seat and valve Valve between coaxial spring biasing means and actuator Coaxial spring biasing means between valve and actuator Actuator wall between valve and coaxial spring biasing means HERMETIC FLEXIBLE WALL SEAL FOR ACTUATOR | |
