| 摘要 |
<p>PURPOSE:To improve the responsiveness of the pressure control of a pressure reducing valve to the fluctuation of the load, by supplying positively a fluid to the secondary port of a main valve from a pilot valve prior to the operation of the main valve. CONSTITUTION:A 3-port type pilot valve 22 of a spool style is provided and the primary port (a) of the valve 22 is connected to the primary port a of a main valve 21. While the secondary port (b) of the valve 22 is connected to the secondary port B of the valve 21 respectively. When the pressure Pa of the port B drops suddenly less than a set level, a pressure fluid is supplied positively to the end at the other side of a main spool 25 as well as to the port B from the port (a) through the compact valve 22 having high responsive ness before the valve 21 works. This accelerates the responsiveness of the correcting operation of the port B against the fluctuation of pressure.</p> |
