Control Valve Having Thermal Displacer for Limiting Thermal Conductivity

A control valve, comprising:

• a valve body defining an inlet, an outlet, and a fluid flow path extending between the inlet and the outlet;
• a valve seat disposed in the fluid flow path;
• a control element;
• a valve stem coupled to the control element and configured to move the control element between a closed position, in which the control element sealingly engages the valve seat, and an open position, in which the control element is spaced from the valve seat;
• an extension coupled to the valve body and comprising an extension cavity;
• a bonnet coupled to the extension to close the extension cavity;
• an actuator stem movably disposed in the bonnet;
• a thermal displacer configured to limit thermal conductivity between process fluid flowing through the fluid flow path and the bonnet;
• and
• a stem connector configured to couple the actuator stem to the valve stem, wherein the thermal displacer is retained within the extension cavity between the stem connector and the control element.

A control valve, comprising:

• a valve body defining an inlet, an outlet, and a fluid flow path extending between the inlet and the outlet;
• a valve seat disposed in the fluid flow path;
• a control element;
• a valve stem coupled to the control element and configured to move the control element between a closed position, in which the control element sealingly engages the valve seat, and an open position, in which the control element is spaced from the valve seat;
• an extension coupled to the valve body and comprising an extension cavity;
• a bonnet coupled to the extension to close the extension cavity;
• and
• a thermal displacer disposed within the extension cavity and having a cylindrical body and a central aperture that is formed in the cylindrical body and sized to receive the valve stem to couple the thermal displacer to the valve stem, the thermal displacer configured to limit thermal conductivity between process fluid flowing through the fluid flow path and the bonnet.