| 摘要 |
[PROBLEMS] A cavitation preventive high differential pressure control valve in which even a valve element unit exhibits cavitation suppression capability, flow rate and pressure can be controlled over a wide range of valve opening from low opening to high opening, such a valve element profile as the flow rate characteristics at the intermediate opening of the valve can be selected depending on the use, cavitation can be prevented more highly through simple and compact arrangement by combining a cavitation prevention body and a valve element of that valve element profile, and high controllability is exhibited even under high differential pressure, high current velocity conditions. [MEANS FOR SOLVING PROBLEMS] In a valve comprising a substantially tubular main body of valve and a valve element arranged in the main body of valve to open/close the interior, a cavitation prevention body is arranged at a position directly downstream of the valve element under full open state. The cavitation prevention body is constituted to prevent occurrence of cavitation by arranging a plurality of sheets of porous plate, each having a plurality of holes of predetermined depth formed at an equal pitch, at a predetermined interval substantially in parallel with a flow flowing downward in the main body of valve. |
