| 摘要 |
<p>This invention relates to a three-way hydraulic valve, stable in two positions, intended for distributing a liquid containing impurities, comprising a ball valve whose ball is located in the first way, the inlet for said liquid, and has a seat located between the first and the second way, the pressure of said liquid applying said ball on said seat, a conical needle valve, a calibrated spring applying said needle on a seat located between the second and third way, said seat being of diameter smaller than that of the seat of said ball valve, and a manoeuvring rod outside the valve body, with which said needle is fast and which comprises an extension abutting on said ball and maintaining it open when the needle is closed.</p> |
