| 摘要 |
<p>A reducing valve consisting of a main valve (11), and a pilot valve (22). In the main valve, a main spool (13) is slidably fitted in a cylindrical spool chamber (12), which has an annular groove (17) provided with an inlet (A), an annular groove (16) provided with an outlet (B), and an annular groove (15) provided with a return port (T), to thereby form at one end of the main spool a pilot chamber (18) communicated with the outlet, and at the other end thereof a control chamber (25). An inlet (a) of the pilot valve and the inlet of the main valve are communicated through a passage (51), and an outlet (b) of the pilot valve and the control chamber in the main valve communicated through a passage (52). The pressure in the outlet of the main valve can be set higher by a small operating force of a biassing means (48) in the pilot valve (22). This reducing valve is used to control the pressure of a fluid for a hydraulic cylinder for a clutch in an automobile.</p> |
