| 摘要 |
PURPOSE:To absorb back pressure produced upon abrupt blocking of fluid through a pressure reduction chamber by providing a restricted section at a flow path hole and communicating the restricted section with the pressure reduction chamber formed at the outside of the flow path hole. CONSTITUTION:A partially restricted flow path hole 2 is formed in a body 1 and a pressure reduction chamber 3 is formed at the outside of the flow path hole 2. The pressure reduction chamber 3 is formed around the flow path hole 2 which is enclosed air-tightly by means of an outer tube 4. A plurality of through-holes 5 are made, as a penetrating section, between the restricted section of the flow path hole 2 and the pressure reduction chamber 3 with same interval, and the flow path hole 2 and the pressure reduction chamber 3 are communicated at the restricted section. |
