GAS SUPPLY DEVICE AND AIR OR NITROGEN SUPPLY DEVICE FOR NUCLEAR POWER PLANT

摘要

PROBLEM TO BE SOLVED: To remotely control an operation valve such as an air-operated valve even in the case where a power source is lost.SOLUTION: A gas supply device comprises: an operation valve which is installed in the middle of piping for flowing of at least gas in a plant and operates a valve body with gas flowing within the piping; a solenoid valve installed in the middle of the piping and opens/closes the flow of gas to the operation valve; and a gas supply source for supplying gas to the solenoid valve. In an exhaust line of the solenoid valve, a changeover valve is installed for switching gas exhaustion from the solenoid valve and air supply to the solenoid valve and in the case where a power source is lost, the changeover valve is switched to connection with the gas supply source in order to supply gas to the solenoid valve.