Benkan Corporation

Kouki Tada

Takaomi Hanyu

Kazushi Ohhashi

A metal diaphragm valve includes a valve casing and an inverted bowl-shaped metal diaphragm made of an elastic material and having a downwardly projecting collar disk made integral with the metal diaphragm in its center. The metal diaphragm defines within the valve casing a valve chamber into which one end of each of a pair of inlet and outlet passages open, with their opposite end being connected to an external pipe system for cleaning fluid. The vertical movement of a valve stem supported in the valve casing causes the metal diaphragm to move into contact with or away from an annular valve seat that is formed above the valve chamber. When the valve stem is forced down, the metal diaphragm is bent downward against its elasticity to bring its collar disk into close contact with the valve seat, closing the valve chamber. When the valve stem is uplifted, the metal diaphragm restores back to its original position, with the collar disk moved away from the valve seat, opening the valve chamber. Because of this design, there will be no waving of the diaphragm when pressed against the valve seat. Also, the valve seat has a hardened top surface where it is contacted with the collar disk, less scratching would occur due to impacts when the collar disk is bumped against the valve seat in its closing action, minimizing the generation of metal particles.

Metal diaphragm valve

A metal diaphragm valve includes a valve casing, a diaphragm made of an elastic material and having an upward bulge in the center and a valve system in which the diaphragm is operated to close or establish a fluid-flow relationship between an inlet passage and an outlet passage both mounted in the casing. The valve system is separated by the diaphragm from the casing and comprises a vertically shiftably disposed push rod adapted to directly move the diaphragm, a plurality of steel balls arranged in a circular groove of a V-shaped cross section defined in the top surface of the push rod, a vertically movably disposed drive rod having a tapered lower end portion situated above the center of the groove and place in constant contact with the steel balls, and a drive means adapted to move the drive rod. The groove has an outer concentric slope and an inner concentric slope, and the steel balls are normally made to stay in the inner slope of the groove. When the drive means is actuated to cause the drive rod to move lower, the tapered end portion forces the steel balls to move outwardly into the outer slope. The force exerted on the balls by the tapered end portion is transmitted to the push rod, which in turn depresses the diaphragm to close the fluid-flow relationship between the inlet passage and outlet passage.

Growing community of inventors

Yokohama, Japan

Kouki Tada