| 摘要 |
PROBLEM TO BE SOLVED: To provide a four way valve having an excellent sealing performance and an excellent flow rate characteristics. SOLUTION: The four way valve is constituted of a main body having a chief flow path, a valve chamber and a pair of branched flow paths, a cylinder body having a cylinder section in which a piston is inserted, and a cylinder lid connected to the upper part of the cylinder body. The chief flow path is arranged under the main body and the valve chamber is disposed to communicate with the chief flow path through a communication opening. The edge of the communication opening forms a valve seat. The lowermost part of the inner diameter of the branched path is formed flush with the bottom face of the valve chamber. A rod supported at the bottom of the cylinder body is protrusively installed at the center of the lower face of the piston, and the valve body getting into contact with the valve seat is inserted at the extrimity of rod, and the valve body is connected to a diaphragm held by the main body and the cylinder, and a pair of actuation fluid supply openings for vertically moving the piston are installed at the side face of the cylinder body.
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