| 摘要 |
PURPOSE:To decrease operating force of valve opening, by simultaneously closing inflow and outflow holes with a single of valve through a valve body, housing the valve body in a main valve chamber, providing a pilot valve chamber neighboring to said main valve chamber and both communicating the both chambers and controlling a pilot valve in the pilot valve chamber from the outside. CONSTITUTION:An inflow hole 4, communicated to a water supply pipe 2, is provided to the center part of a valve seat 3 and an outflow hole 5 is provided around the inflow hole 4, in the lower part of a valve housing 1. A valve body 6 is urged by a spring 7 to close said valve seat 3. Neighboring to the valve housing 1, a pilot valve chamber 9 is provided, and the both housing and chamber are communicated through a fine hole 15. A pilot valve 12 is urged by a spring 14 to close a valve port 17 in the pilot valve chamber 9, if an externally operating shaft 19 is turned to press and tilt a valve rod 13 through a cam 16, pressure of water in a main valve chamber 10 is removed through the valve port 17 and the fine hole 15, and the valve body 6 is lifted by water pressure of the water supply pipe 2, then the inflow hole 4 and the outflow port 5 are communicated. |
