Yamada Corporation

Oki Electric Industry Co., Ltd.

Satoru Suwabe

Kotaro Yamada

Jiro Kobayashi

Syunji Abe

A ball non-return valve that can be integrated with a diaphragm pump or the like, does not transmit strain generated by stress during valve assembly to a ball seal portion, and can stably maintain sealing performance, and a diaphragm pump are disclosed. The non-return valve includes a valve seat having a through-hole, and a ball that opens and closes a flow of a fluid through the through-hole. The valve seat made of a corrosion resistant material is composed of a first valve seat that can support the ball and seal the through-hole, and a second valve seat that has a substantially cylindrical shape surrounding the first valve seat and in which the space between a valve case and the second valve seat is sealed by an O-ring. Clearances dand dare formed between the first valve seat and the second valve seat, and a horizontal surface of a notched portion of the second valve seat is mounted on an upper surface of a flange portion of the first valve seat.

Ball non-return valve and diaphragm pump

To manufacture a diaphragm pump with higher reliability in which the mechanism of a main valve is simplified without a pilot chamber. A diaphragm pumpincludes paired diaphragmsandthat define pump chambersand air chambers, a main body unitthat slidably supports a center rodat a central portion of each diaphragmso as to be capable of reciprocating the center rod, and a valve bodythat houses a spoolthat switches supply of a fluid to the air chambersandso as to reciprocate the center rod, the valve bodyincluding a sleeve, and the spoolthat is disposed inside the sleeveto be reciprocated in an axial direction, wherein the spoolis composed of a disc-shaped portion S, a disc-shaped portion S, and a disc-shaped portion S, and a surface area of each disc-shaped portion that receives a compressed air pressure has a relationship that an upper side of the disc-shaped portion S&#x3e;a lower side of the disc-shaped portion S&#x3e;an upper side of the disc-shaped portion S

Diaphragm pump with valve switching device

Diaphragm pump

Microprocessor controlled converter having reduced noise interference

Growing community of inventors

Tokyo, Japan

Satoru Suwabe