Ball valve and methods of fabrication
First Claim
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1. A ball valve comprising:
- a generally spherically shaped ball having a shaft integrally attached to one side thereof, a flow passage being formed through said ball, a recessed surface being formed around said flow passage on either side of said ball extending inwardly beyond the spherical surface of said ball;
a valve body made of a synthetic resin, said valve body having a flow passage extending longitudinally therethrough and provided with connecting means at outer ends of said flow passage in said valve body;
a generally annularly shaped ball seat fixed to said valve body at a position surrounding said flow passage in said valve body, said ball seat having an inner generally annularly shaped lip extending into a recess defined by said recessed surface of said ball when said ball is in an open position without contacting said ball and in close contact with said ball to thereby bring said lip into sealing engagement with said ball when said ball is in a closed position irrespective of the flow pressure of the flow passage.
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Abstract
A ball valve and a method for fabricating this ball valve wherein a ball seat, formed of a synthetic resin, is mounted at each end of a flow passage in a ball of the valve. A sealing end portion of the ball seat contacts the spherical surface of the ball only in the closed position of the ball. In the open position, the lip falls within a recess surrounding the end of the flow passage in the ball. A gap of 0.3 to 0.7 mm is formed, in the open position, between the wall surface of the recess and the end of the lip. The end of the lip should fall, in the open position of the ball, about 0.2 mm inside an imaginary continuation of the surface of the ball at the recess.
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Citations
12 Claims
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1. A ball valve comprising:
- a generally spherically shaped ball having a shaft integrally attached to one side thereof, a flow passage being formed through said ball, a recessed surface being formed around said flow passage on either side of said ball extending inwardly beyond the spherical surface of said ball;
a valve body made of a synthetic resin, said valve body having a flow passage extending longitudinally therethrough and provided with connecting means at outer ends of said flow passage in said valve body;
a generally annularly shaped ball seat fixed to said valve body at a position surrounding said flow passage in said valve body, said ball seat having an inner generally annularly shaped lip extending into a recess defined by said recessed surface of said ball when said ball is in an open position without contacting said ball and in close contact with said ball to thereby bring said lip into sealing engagement with said ball when said ball is in a closed position irrespective of the flow pressure of the flow passage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a generally spherically shaped ball having a shaft integrally attached to one side thereof, a flow passage being formed through said ball, a recessed surface being formed around said flow passage on either side of said ball extending inwardly beyond the spherical surface of said ball;
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8. A ball valve comprising:
- a generally spherically shaped ball having a shaft integrally attached to one side thereof, a flow passage being formed through said ball, a recessed surface being formed around said flow passage on either side of said ball extending inwardly beyond the spherical surface of said ball;
a valve body made of a synthetic resin, said valve body having a flow passage extending longitudinally therethrough and provided with connecting means at outer ends of said flow passage in said valve body;
a generally annularly shaped ball seat disposed in said valve body at a position surrounding said flow passage in said valve body, said ball seat having an inclined outer surface having a larger diameter at a side thereof disposed toward said ball, grooves formed therein in outer peripheral and side portions thereof, and an inner generally annularly shaped lip extending into a recess defined by said recessed surface of said ball when said ball is in an open position without contacting said ball and in contact with said ball when said ball is in a closed position irrespective of the flow pressure of the flow passage, wherein an inner surface of said lip which contacts said spherical surface of said ball in said closed position of said ball is curved. - View Dependent Claims (9, 10, 11, 12)
- a generally spherically shaped ball having a shaft integrally attached to one side thereof, a flow passage being formed through said ball, a recessed surface being formed around said flow passage on either side of said ball extending inwardly beyond the spherical surface of said ball;
Specification