SLAM SHUT-OFF SYSTEM FOR GAS PRESSURE REGULATING DEVICE

摘要

PURPOSE: An emergency shutdown device for a gas governor is provided to shut off a solenoid valve in case of normal supply pressure, and to open the solenoid valve to automatically flow the supply pressure into an emergency shutdown valve if excessive pressure generates in a rear end supply line of a gas governor. CONSTITUTION: An emergency shutdown device for a gas governor comprises an emergency shutdown valve(52), a sensing line(60), a pressure measuring device, a solenoid valve(80), and a controller. The emergency shutdown valve is installed on a gas supply line and shut off the gas supply line in case that the pressure in a rear end supply line is over a set pressure. The sensing line is connected to the inner side of an emergency shutdown valve at the rear end supply line to provide the gas pressure of the rear end supply line. The pressure measuring device is installed in the rear end supply line to measure the gas supply pressure. The solenoid valve is installed on the sensing line to open and close the sensing line. The controller receives the detecting results of the pressure measuring device. If the gas pressure of the rear end supply line is less than the set pressure, the controller controls the solenoid valve to shut off the sensing line. If the gas pressure of the rear end supply line is over the set pressure, the controller controls the solenoid valve to open the sensing line so that the gas pressure can flow into the emergency shutdown valve.