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US 6,655,658 B2Granted
Plug valve assembly and fluid flow control method with improved low pressure sealing
AssigneeHalliburton Energy Services, Inc.
InventorsKenneth G. Neal, Gregory A. Hall
Life of this patent
Estimating the term…
Abstract
A plug valve and fluid control method according to which a cylindrical plug is provided in a bore of a body member and has a through passage formed therein. The plug is adapted to be rotated about its axis to move the passage between an open position in which it is in alignment with passages in the body member to permit fluid flow through the body member, and a closed position in which it is out of alignment with the passages to prevent the fluid flow.
Claims22
A plug valve assembly comprising:
- a body member having an inlet passage for receiving fluid, an outlet passage for discharging the fluid, and a bore;
- a plug disposed in the bore and having a through passage formed therein so that the plug can be rotated about its axis to move the through passage between an open position in which it is in alignment with the inlet and outlet passages to permit fluid flow through the body member, and a closed position in which it is out of alignment with the inlet and outlet passages to prevent the fluid flow;
- and
- at least one tapered insert disposed between the outer surface of the plug and the corresponding portion of the wall of the body member defining the bore, the tapered insert being in sealing engagement with the plug and extending out of contact with the body member at relative low pressures of the fluid.
1 more element
A plug valve assembly comprising:
- a body member having an inlet passage for receiving fluid, an outlet passage for discharging the fluid, and a bore;
- a plug disposed in the bore and having a through passage formed therein so that the plug can be rotated about its axis to move the through passage between an open position in which it is in alignment with the inlet and outlet passages to permit fluid flow through the body member, and a closed position in which it is out of alignment with the inlet and outlet passages to prevent the fluid flow;
- at least one tapered insert disposed between the outer surface of the plug and the corresponding portion of the wall of the body member defining the bore;
- and
- means extending between the tapered insert and the body member for applying a force against the tapered insert to force the tapered insert into engagement with the plug.
2 more elements
A method of controlling fluid flow comprising:
- introducing fluid into an inlet passage of a body member;
- providing a plug disposed in a bore of the body member and having a through passage formed therein so that the plug can be rotated about its axis to move the through passage between an open position in which it is in alignment with the inlet passage to permit fluid flow through the body member, and a closed position in which it is out of alignment with the inlet passage to prevent the fluid flow;
- and
- providing at least one tapered insert between the outer surface of the plug and the corresponding portion of the wall of the body member defining the bore, the tapered insert being in sealing engagement with the plug and extending out of contact with the body member at relative low pressures of the fluid.
1 more element
A method of controlling fluid flow comprising:
- introducing fluid into an inlet passage of a body member;
- providing a plug disposed in a bore of the body member and having a through passage formed therein so that the plug can be rotated about its axis to move the through passage between an open position in which it is in alignment with the inlet passage to permit fluid flow through the body member, and a closed position in which it is out of alignment with the inlet passage to prevent the fluid flow;
- providing at least one tapered insert between the outer surface of the plug and the corresponding portion of the wall of the body member defining the bore;
- and
- applying a force against the tapered insert to force the tapered insert into engagement with the plug at the relative low pressures.
2 more elements
Dependencies are inferred from the claim text.