| 摘要 |
A pilot valve for controlling operation of a hydraulically-actuated pressure reducing valve includes a housing and a first valve member 28 and seat 29 mounted in the housing for movement relative thereto in response to the outlet pressure of the pressure reducing valve. Movement of a second valve member, comprising a nozzle 24 fixed to the inside of a toroidal ring 25 discharging flow from a chamber within the second valve member onto the seat 29, is caused by differential pressure applied between diaphragms 22 and 23 reacting against a resiliently biased member 16. Control by the pilot valve is dependent on the relative positions of the first and second valve members. |
