Double check valve which applied the check valve, pressure-reducing backflow preventer and check valve

摘要

PROBLEM TO BE SOLVED: To reduce flow resistance of a check valve and improve reverse flow preventing capacity.;SOLUTION: A valve seat A of the check valve is separated from a housing. A pressure sensitive disk movable to the housing is formed. A valve A is faced to the valve seat A and a valve element is energized. A stopper controlling movement of the valve element toward an outlet side is provided. The valve is opened by contact of the valve element to the stopper. The pressure sensitive disk sensing pressure difference and a valve opening and closing fluid are separated. Flow resistance and sealing force of the valve can be determined by combination of a diameter of the pressure sensitive disk and force energizing the valve.;COPYRIGHT: (C)2003,JPO