Eccentric rotary valve with control-improving wing member
First Claim
1. A fluid flow controlling rotary valve comprisinga housing containing a fluid flow path with a central axis,a valve seat located within said housing along said flow path,a plug means having a sealing face cooperating with said valve seat in the closed position to block said fluid flow path,a support shaft arranged to carry said plug means and being rotatable on an axis which is normal to and spaced from the axis of said valve seat so that rotation of said shaft moves said plug means relative to said valve seat anda wing member means attached to said plug means for movement therewith in said fluid flow path and located entirely on one side of an axis of said plug means, said plug means axis coinciding with said central axis when said plug means is in said closed position;
- said wing member being arranged to exert a rotative force on said support shaft in the presence of fluid flow along said fluid flow path which force progressively decreases as said plug means moves progressively in a valve opening direction;
said plug means exerting a first rotative force on said shaft in a valve opening direction in the presence of fluid flow along said flow path and said wing member means being constructed and arranged to exert a second rotative force on said shaft in said valve opening direction in the presence of fluid flow along said flow path, said first and second forces thereby acting together to produce a net unidirectional force to move said plug toward a valve opening position.
1 Assignment
0 Petitions
Accused Products
Abstract
The two supports for the plug in an eccentric rotary valve are joined and rotatively coupled by a wing member. As the plug is rotated from its closed position on the cooperating seat by the rotation of a shaft fixed to one of the plug supports, the wing member lies in the fluid flowing through the valve. This fluid flow causes the wing member to exert a rotative force on the shaft in the direction to move the plug in its valve-opening direction. This force shifts the inherently unstable control region of a rotative force, which the fluid flow causes the plug to exert on the shaft, and thereby extends and widens the range of the plug positions in which an external rotative force applied to the shaft, as by a valve actuator, can uniquely determine, and exert exclusive control over, the shaft and plug positions.
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Citations
5 Claims
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1. A fluid flow controlling rotary valve comprising
a housing containing a fluid flow path with a central axis, a valve seat located within said housing along said flow path, a plug means having a sealing face cooperating with said valve seat in the closed position to block said fluid flow path, a support shaft arranged to carry said plug means and being rotatable on an axis which is normal to and spaced from the axis of said valve seat so that rotation of said shaft moves said plug means relative to said valve seat and a wing member means attached to said plug means for movement therewith in said fluid flow path and located entirely on one side of an axis of said plug means, said plug means axis coinciding with said central axis when said plug means is in said closed position; - said wing member being arranged to exert a rotative force on said support shaft in the presence of fluid flow along said fluid flow path which force progressively decreases as said plug means moves progressively in a valve opening direction;
said plug means exerting a first rotative force on said shaft in a valve opening direction in the presence of fluid flow along said flow path and said wing member means being constructed and arranged to exert a second rotative force on said shaft in said valve opening direction in the presence of fluid flow along said flow path, said first and second forces thereby acting together to produce a net unidirectional force to move said plug toward a valve opening position. - View Dependent Claims (2, 3, 4, 5)
- said wing member being arranged to exert a rotative force on said support shaft in the presence of fluid flow along said fluid flow path which force progressively decreases as said plug means moves progressively in a valve opening direction;
Specification