Integral control valve and actuator

摘要

A combined, integral flow control valve and actuator is formed with a two part valve body and a slidable plug therebetween. A valve seat is formed integrally within the valve body. The slidable plug and the valve body define actuating chambers. A positioner/actuator mounted to the valve body has an output coupled to the actuator chamber to move the slidable plug with respect to the valve seat and thereby control fluid flow. In a single action device, a spring return moves the slidable plug towards the valve seat. In a dual acting embodiment, two actuating chambers are provided and two integral valve seats are provided in a symmetrical configuration. The valve seat is removable enabling different materials to be used for the valve seat.