Gas tight plug valve
OwnerHeinz A. von Pechmanninventor
Life of this patent
Estimating the term…
Abstract
A rotatable valve member for use in controlling fluid flow in a conduit, such as a conduit used for the transmission of liquids and gas in oil servicing operations, is disclosed. The plug valve has a rotatable cylindrical plug member received within a body member. Two semi-cylindrical inserts are positioned between the rotatable plug and the body member, each insert having a tapered outer surface and a cylindrical inner bore. A close fitting surface on the inner bore of the insert establishes a gas tight metal-to-metal seal with the plug. Lubrication is injected through the plug into a groove on the close fitting insert sealing surface. A trapezoidal seal is received in a mating groove on the tapered exterior of the insert.
Claims17
A plug valve for use in controlling fluid flow, including the flow of gas, in a fluid transmission conduit comprising:
- a body having a tapered bore transversely positionable in intersecting relationship to the fluid transmission conduit and having inlet and outlet ports alignable with the fluid transmission conduit;
- a cylindrical plug rotatable about an axis perpendicular to the body ports and having a passageway extending therethrough perpendicular to the plug axis of rotation and being selectively alignable with the ports to permit fluid transmission therethrough;
- at least one insert positioned with the insert axis parallel to the plug axis within the tapered body bore between the body and the plug and having a tapered exterior surface and a cylindrical inner bore with insert holes extending therethrough aligned with the body ports;
- a nut engaging the body and the insert to hold the insert in alignment with the body;
- and
- means for introducing lubricant through the plug and depositing lubricant within the cylindrical bore of the insert only between the plug and insert into separate continuous grooves in surrounding relationship to the plug passageway at each end of the plug passageway when the plug valve is in the open position.
A plug valve for use in controlling fluid flow, including the flow of gas, in a fluid transmission conduit comprising:
- a body having a bore transversely positionable in intersecting relationship to the fluid transmission conduit and having inlet and outlet ports alignable with the fluid transmission conduit;
- a cylindrical plug rotatable about an axis perpendicular to the body ports and having a passageway extending therethrough perpendicular to the plug axis of rotation and being selectively alignable with the ports to permit fluid transmission therethrough;
- at least one insert positioned with the insert axis parallel to the plug axis within the body bore between the body and the plug and having an exterior surface and a cylindrical inner bore with insert holes extending therethrough aligned with the body ports;
- a securing member engaging the body and the insert to hold the insert in alignment with the body;
- a close fitting sealing surface on the insert surrounding each insert hole establishing a gas tight metal-to-metal seal with the exterior of the plug;
- an insert groove in surrounding relationship to each insert hole, the groove being centrally disposed on the sealing surface whereby lubricant progressively wipes the sealing surface on both sides of the groove as the plug rotates;
- and
- means for introducing lubricant through the plug and depositing lubricant only in the insert groove surrounding each insert hole.
Dependencies are inferred from the claim text.