| 摘要 |
PURPOSE:To prevent a spool from vibrating and reduce variation in the pressure of a fluid discharged, by providing a flowdown throttle so that it is communicated to the downstream side of an orifice. CONSTITUTION:A flowdown throttle conventionally provided in such a manner as to be connected to the upstream-side passage 11 is eliminated, the passage 11 is connected to a spool chamber 2 through an oridinary communicating passage 19, and the flowdown throttle 20 is provided as a substitute for a communicating passage which communicates a downstream-side passage 13 (provided in a valve main body 1 on the outside of the spool chamber 2 in such a manner as to be communicated to the downstream side of the orifice 7) and an annular groove 3a of the spool 3 in the spool chamber 2 to each other. Accordingly, since the flowdown throttle 20 is provided between the spool chamber 2 and the downstream- side passage 13 communicated to the downstream side of the orifice 7, vibration and self-excited vibration of the spool 3 and resultant generation of noises can be prevented from occurring. |
