Pressure control system for relief and shutdown of flow

摘要

This disclosure is related to a non-electronic pressure control system for a pressurized system that receives fluid from a fluid supply. The pressure control system includes a control module, an actuator and a flow control device. The control module monitors the pressure of fluid either upstream or downstream of the flow control device. The control module can send a pneumatic signal to the actuator to open or close the flow control device responsive to the pressure monitored by the control module and the pressure required for the pressurized system.

主权项

1. A pressure control system for monitoring fluid pressure for a pressurized system, the pressure control system comprising:
a fluid control device for affecting the pressure of fluid downstream from the fluid control device; an actuator for opening and closing the fluid control device; and a control module for processing pneumatic signals from at least one predetermined pressure point upstream or downstream from the fluid control device, the control module sending signals to the actuator to open or close the fluid control device responsive to pneumatic signals, the control module comprising:
a pressure sensor to determine pressures of the fluid from the at least one predetermined pressure point;an air switch to receive pneumatic signals from the pressure sensor responsive to the pressure of the fluid from the at least one predetermined pressure point;a charge valve to send a pneumatic signal to the actuator or exhaust fluid from the control module responsive to a pneumatic signal received from the air switch;a first regulator to control the pressure of fluid entering the control module from an instrument air pressure line and passing to the charge valve; anda second regulator to alter pressure of fluid from the pressure sensor to increase the air switches effectiveness at system pressures outside of an operational range of the air switch.