Fluid flow control apparatus for use with fluid valves
First Claim
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1. An apparatus comprising:
- a plug for a sliding stem fluid valve, the plug having a first portion slidably coupled to a second portion, the second portion to contact a first seat of the fluid valve to close the fluid valve;
a cavity formed in an outer circumferential surface of the plug by the first portion and the second portion, an axial dimension of the cavity to decrease when the first portion slides toward the second portion, the decrease to radially outwardly displace a seal disposed in the cavity, the seal having a flat inner surface and a curved outer surface located opposite the flat inner surface, the flat inner surface engaging the second portion, the curved outer surface configured to engage an inner circumferential wall of a cage of the fluid valve in response to the second portion contacting the first seat; and
a second seat disposed in the cavity between the seal and the first portion or the second portion, the second seat having a curved surface configured to engage the outer curved surface of the seal as the first portion slides toward the second portion to assist in radially outwardly displacing the seal.
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Abstract
Fluid flow control apparatus for use with fluid valves are disclosed. An apparatus includes a plug for a sliding stem fluid valve. The plug has a first portion slidably coupled to a second portion. The apparatus also includes a cavity formed in an outer circumferential surface of the plug by the first portion and the second portion. A dimension of the cavity changes when the first portion slides relative to the second portion to displace a seal disposed in the cavity. The seal sealingly engages a cage of the fluid valve when the second portion contacts a seat of the fluid valve.
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Citations
21 Claims
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1. An apparatus comprising:
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a plug for a sliding stem fluid valve, the plug having a first portion slidably coupled to a second portion, the second portion to contact a first seat of the fluid valve to close the fluid valve; a cavity formed in an outer circumferential surface of the plug by the first portion and the second portion, an axial dimension of the cavity to decrease when the first portion slides toward the second portion, the decrease to radially outwardly displace a seal disposed in the cavity, the seal having a flat inner surface and a curved outer surface located opposite the flat inner surface, the flat inner surface engaging the second portion, the curved outer surface configured to engage an inner circumferential wall of a cage of the fluid valve in response to the second portion contacting the first seat; and a second seat disposed in the cavity between the seal and the first portion or the second portion, the second seat having a curved surface configured to engage the outer curved surface of the seal as the first portion slides toward the second portion to assist in radially outwardly displacing the seal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
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a fluid flow control member of a fluid valve, the fluid flow control member having a first portion and a second portion, the first portion fixedly coupled to a stem of the fluid valve, the second portion slidably coupled to the stem and the first portion, the second portion to contact a first seat of the fluid valve to close the fluid valve; a cavity formed in an outer circumferential surface of the fluid flow control member, the cavity defined by the first portion and the second portion, an axial dimension of the cavity to decrease when the first portion slides toward the second portion, the decrease to radially outwardly displace a seal disposed in the cavity, the seal having a flat inner surface and a curved outer surface located opposite the flat inner surface, the flat inner surface engaging the second portion, the curved outer surface configured to engage an inner circumferential wall of a cage of the fluid valve in response to the second portion contacting the first seat; and a second seat disposed in the cavity between the seal and the first portion or the second portion, the second seat having a curved surface configured to engage the outer curved surface of the seal as the first portion slides toward the second portion to assist in radially outwardly displacing the seal. - View Dependent Claims (15, 16, 17, 18)
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19. An apparatus comprising:
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a fluid flow control member operatively coupled to a fluid valve, a first portion of the fluid flow control member spaced by a distance relative to a second portion of the fluid flow control member, the second portion to contact a first seat of the fluid valve to close the fluid valve; means for guiding movement of the second portion relative to the first portion, the means for guiding disposed within the fluid valve; a cavity formed in an outer circumferential surface of the fluid flow control member, the cavity defined by the first portion and the second portion, an axial dimension of the cavity to decrease when the first portion slides toward the second portion, the decrease to radially outwardly displace a seal disposed in the cavity, the seal having a flat inner surface and a curved outer surface located opposite the flat inner surface, the flat inner surface engaging the second portion, the curved outer surface configured to engage an inner circumferential wall of a cage of the fluid valve in response to the second portion contacting the first seat; and a second seat disposed in the cavity between the seal and the first portion or the second portion, the second seat having a curved surface configured to engage the outer curved surface of the seal as the first portion slides toward the second portion to assist in radially outwardly displacing the seal. - View Dependent Claims (20, 21)
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Specification