| 摘要 |
<p>PURPOSE:To enlarge the service temperature range by varying the oscillating frequency of the control current on the basis of the detection information by a temp. sensing means to sense the temp. of a working oil. CONSTITUTION:A temp. sensor 17 senses the temp. of a working oil in a decompressing valve 11, and the temp. of the working oil as detection information is fed into a control circuit 16. A No.2 control part 19 of this control circuit 16 varies the oscillating frequency of the control current on the basis of detection information by the temp. sensor 17, and the frequency of a dither to be applied to a spool 1 is optimally controlled according to the working oil temp. of the decompression valve 11. Therefore, dither of the decompression valve 11 as valve element is easily promoted even in the low temp. range. This decreases the friction resistance of the valve element in a wide temp. range, to lead to enhancement of the pressure accuracy of control oil pressure.</p> |
