Smc Kabushiki Kaisha

Naoyuki Yasuda

Taku Tomita

Mitsutoshi Araki

When a valve body of a pressure-reducing valve is displaced in the direction indicated by the arrow B, a seal pad of a valve seal mechanism on the valve body abuts against a ridge on a seat, which enters the seal pad to provide a seal therebetween. When the ridge enters the seal pad by a distance, abutment surfaces of holders on the seat are held against the seal pad, preventing the ridge from entering the seal pad beyond the distance. The distance by which the ridge enters the seal pad is thus made constant. The ridge is spaced from the abutment surfaces by a groove, which communicates with a primary port through grooves between the holders, keeping a constant valve sealing area. The pressure-reducing valve which incorporates the valve seal mechanism has a constant quality level.

Valve seal mechanism

A recess and another recess having an enlarged diameter with respect to the recess are defined in a main body, wherein a valve guide body is inserted into the recess. Projections of the valve guide body engage inside grooves defined in a wall portion constituting the recess, and second projections of a cover member engage with first projections formed on a wall constituting the other recess, stopping the cover member from falling out. A pressure of a pressurized fluid which is imposed on the valve guide body is supported by the cover member. As a result, there is no concern of damage to the valve guide body, and moreover, there is no concern of unexpected dislocation of the valve guide body.

Growing community of inventors

Ibaraki-ken, Japan

Naoyuki Yasuda