Abstract: Collets for coupling rotary actuators to process control devices are disclosed. An example collet includes at least one flexible member having a first surface and a second surface. The first surface is configured to engage a rectangular shaft and the second surface is configured to engage a third surface of a substantially rectangular bore. The flexible member is coupled to a first end of an elongated member and configured to be displaced toward an axis of the elongated member by the third surface. The elongated member is configured to be coupled to at least a portion of a process control device actuator.

Abstract: A control valve includes a valve body fabricated from a first metallic material, a flow passage formed through the valve body, a valve plug movable within the flow passage between an open and a closed position, and a valve seat within the flow passage. The valve seat is fabricated from a second metallic material having at least one physical characteristic different from that of the first metallic material, and is integrally formed with the valve body.