High-pressure plug valve
AssigneeStinger Wellhead Protection, Inc.
InventorsBob McGuire, L. Murray Dallas
Life of this patent
Estimating the term…
Abstract
A plug valve has a valve body, a cage fitted within the valve body and a rotatable plug housed within a cylindrical cavity in the cage, for controlling fluid flow through the valve. The cage has first and second opposed flat side surfaces, each side surface has a port for receiving a replaceable flow-path insert in a fluid-tight seal. In one embodiment, the plug also includes at least one inset seal for sealing the at least one of the ports when the plug is in a closed position to inhibit leakage through the valve at low fluid pressures.
Claims20
A plug valve comprising:
- a valve body having a flow path bore through the valve body and opposed sides of a socket in the valve body;
- a replaceable cage non-rotatably received within the socket, the replaceable cage having first and second ports respectively aligned with the flow path bore and a cylindrical cavity that receives a valve plug that controls fluid flow through the flow path bore;
- and
- first and second flow-path inserts that line the flow path bore on respective sides of the socket, the first and second flow path inserts having an inner end received in a respective one of the ports.
A plug valve comprising:
- a valve body;
- and
- a replaceable cage non-rotatably received within a socket in the valve body, the replaceable cage including first and second ports respectively aligned with a flow path bore through the valve body, the respective first and second ports receiving an inner end of a respective replaceable flow-path insert that lines the flow path bore through one side of the valve body, the replaceable cage further defining a cylindrical cavity for receiving a valve plug that is rotatable between an open position in which fluid flows through the flow path bore, and a closed position in which fluid flow through the flow path bore is obstructed.
A plug valve that provides a fluid seal at low fluid pressures, comprising:
- a valve body;
- a replaceable cage having first and second opposed flat side surfaces respectively including a port received within a socket in the valve body, the replaceable cage defining a cylindrical cavity that receives a valve plug rotatable between an open position in which fluid flows through a fluid path through the valve body and the respective ports, and a closed position in which fluid flow through the fluid path is obstructed;
- first and second flow-path inserts that line the flow path and have a respective inner end and a respective outer end, the inner end of each flow path insert being received in a respective one of the ports;
- and
- first and second fluid seals affixed to the valve plug that align with the respective ports when the valve plug is in the closed position.
Dependencies are inferred from the claim text.