Self-contained closed-loop electrically operated valve

Abstract

The invention contemplates an electrically operated valve construction for control of fluid flow wherein an actuator module is adapted for detachable connection to a valve-body module which contains the valve member to be automatically positioned by a driver element of the actuator module. All electronic components for moving the driver element are self-contained in the actuator module, and these elements include a fluid-sensing transducer producing an electrical output, for closure of the control loop. The transducer has sealed exclusive exposure to fluid in the valve-body module via a special port within the confines of the interface between the modules, when the modules are assembled to each other; this port communicates directly with that part of the valve-body passage which is on the downstream side of the valve member. An electric cable for external supply of power (and, if desired, command signals) is provided to the actuator module via connector elements exposed for detachable connection at the interface between modules, so that the actuator module requires no wiring or plumbing or other mechanical coupling that is not detachable at the interface between modules.