| 摘要 |
<p>A four-way valve, comprising a body having a main flow passage, a valve chamber, and a pair of branch flow passages and a cylinder body having a piston inserted therein, wherein the valve chamber is allowed to communicate with the main flow passage through a communication port having a valve seat, the branch flow passage is formed so that the lowest part of the inner diameter thereof is flush with the bottom surface of the valve chamber, a rod part having a valve element at the tip thereof is projectedly provided on the lower surface of the piston, the valve element is connected to a diaphragm supported by the body, and a pair of working fluid feed ports for vertically moving the piston are provided in the cylinder body.</p> |
