Electronic controller with integral vent valve

摘要

An electronic regulator includes an inlet valve coupled to an inlet port, the inlet port configured to receive a supply pressure, and an exhaust valve coupled to an exhaust port, the exhaust port configured to release a pilot pressure when the exhaust valve is open. The electronic regulator also includes a pilot pressure output pneumatically coupled to the inlet valve and exhaust valve and configured to be coupled to an external process control device to provide the pilot pressure to the external process control device. A setpoint input coupled to both the inlet valve and the exhaust valve receives a setpoint signal indicative of a setpoint value, and the electronic regulator operates the inlet valve and the exhaust valve to control the pilot pressure according to the setpoint value. Further, the electronic regulator includes a vent valve coupled to a venting port and pneumatically coupled to the pilot pressure output. The venting port is configured to release the pilot pressure according to the safety control signal.

主权项

1. An electronic regulator comprising:
an inlet valve disposed within a regulator housing coupled to an inlet port, the inlet port configured to receive a supply pressure; an exhaust valve disposed within the regulator housing and coupled to an exhaust port, the exhaust port configured to release a pilot pressure when the exhaust valve is open; a pilot pressure output pneumatically coupled to the inlet valve and exhaust valve, the pilot pressure output configured to be coupled to an external process control device to provide the pilot pressure to the external process control device; a setpoint input coupled to both the inlet valve and the exhaust valve and configured to receive a setpoint signal indicative of a setpoint value, wherein the electronic regulator operates the inlet valve and the exhaust valve to control the pilot pressure according to the setpoint value; a vent valve disposed within the regulator housing and coupled to a venting port and pneumatically coupled to the pilot pressure output, the inlet valve, and the exhaust valve, the venting port configured to release the pilot pressure when the vent valve is open; and a safety control input coupled to the vent valve and configured to receive a safety control signal, wherein the vent valve operates to release the pilot pressure, according to the safety control signal, when the inlet valve and the exhaust valve are in a closed configuration.