Flow controller, parts of flow controller, and related method
Patent 5660207 Issued on August 26, 1997. Estimated Expiration Date: 
December 29, 2014. 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.
December 29, 2014. 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 2313128 2675508 2726559 2764996 2902221 3570807 Explosion resistant electric heat motor gas valve Self-cleaning precision metering valve Laminar-flow channeling in thermal flowmeters and the like Adjustable laminar flow bypass InventorAssigneeApplicationNo. 365861 filed on 12/29/1994US Classes:137/599.13, Including flowmeter73/202, Proportional73/204.21, With fluid flow deflector or restrictor (e.g., baffle, constriction)137/44, By shifting of liquid level137/486, Responsive to change in rate of fluid flow137/599.11, Flow passage with bypass285/205, Clamped plate285/382DEFORMEDExaminersPrimary: Michalsky, Gerald A.Attorney, Agent or FirmForeign Patent References
International ClassG05D 007/06AbstractA mass fluid flow controller has a valve which is controlled by a controller rod which is substantially pivotally mounted on a metallic diaphragm which stretches and unstretches with the movement of the rod. The actuation of the rod movement is by the expansion and contraction of an actuator wire which is heated for the expansion and allowed to cool for the contraction. The primary fluid flow path through the controller is straight. A sensor conduit, providing a parallel sensor fluid flow path, is connected in position using metallic sealer members which extend into openings to the primary fluid flow path and which are rounded along the direction through such openings. The pressure drop, along the primary fluid flow path, to create flow through the sensor conduit, is provided by a fluid flow restrictor having a core and having lengths of wire along the core which are squeezed between the core and a tapered fluid flow path wall in the vicinity of the sensor conduit input and output connections. A spherical or a conical shape may be used for the form of the core. A valve seat bushing is mounted in pipe structure providing the primary fluid flow path by applying a force against an end surface of the bushing, with movement of the bushing blocked, in order to deform the end surface, push the outer wall of the bushing against the inner wall of the pipe structure, and fix the bushing in the pipe structure.Other References
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