| 摘要 |
PURPOSE:To make the inner diameter of a valve box so as not to be larger that of a joint fluid pipe line, by locking a valve seat, having a tapered peripheral wall, to an inner wall of the valve box which is provided with an inflow port on one side and an outflow port on the other each, while setting up a valve body similar in type to the valve seat free of slide motion. CONSTITUTION:At a time when a fluid is led in from an inflow port 22 in a normal manner, a valve body 30 slides up to the side of an outflow port 23 till a sliding cylinder part 35 hits a stopper by dint of flowing force of the fluid to be entered from a small valve port 28. Accordingly, there produces a clearance between the valve seat 26 and the valve body 30 whereby the fluid passes through the small valve port 28 and a small hole 29 of the valve seat 26 and flows into the outflow port 23 by way of a small hole 34 and an opening 36 of the valve body 30. On the other hand, when a counter flow happens, the valve body 30 slides till it hits the valve seat 26. At this time, the small valve port 28 of the valve seat 26 is closed up by a blocking wall 31 of the valve body 30, and thereby both small holes 34 and 39 of the valve body 30 and the valve seat 26 become nonconnective so that a flow of fluid is thoroughly intercepted. |
