| 摘要 |
PROBLEM TO BE SOLVED: To prevent a pressure-sensitive responsive member from being given any adverse influence as much as possible when an escape valve is opened and reduce the number of components.SOLUTION: A pressure reduction valve comprises: a resin valve main body 10 including a valve chamber 21 having an opening in an upper surface, and internally having a valve seat 23 with a valve port 22, an outflow chamber 26 disposed at the lower side of the valve port, and a primary side inflow port communicating with the valve chamber and a secondary side outflow port communicating with the outflow chamber disposed in the outer peripheral section; a valve bar 30 including a valve body section 35 for opening and closing the valve port from the lower side, which is constituted so as to be fitted in the valve main body so as to freely slide in a vertical direction; and a diaphragm device 40 mounted on the upper part such that a top opening 10a of the valve main body is closed for driving the valve bar to open and close in a vertical direction. A pressure-sensitive chamber 24 for making the diaphragm device sense a secondary side pressure is disposed between the secondary side outflow port and a diaphragm 41, and an escape valve 70 for allowing a primary side pressure to escape to the outflow chamber when the primary side pressure exceeds a predetermined value is laterally disposed at the specific site of the valve main body. |
