| 摘要 |
PURPOSE:To maintain the control characteristic of a direction control valve at a constant level independently of the temperature of working oil by installing an adjusting member for adjusting the max. shift amount of a spool. CONSTITUTION:When the max. transfer amount of a spool 50 is controlled so as to reduce as the temperature of working oil rises by the thermal expansion action of the temperature sensing members 63 and 64, each opening area of oil passages 61 and 62 gradually reduces, and therefore, even if the viscosity of the working oil gradually lowers as the temperature rises, the working oil flows with a nearly constant flow-rate into the oil chamber 6 or 7 of a hydraulic timer X. Therefore, the response performance of the hydraulic timer X is kept nearly constant independently of the variation of the temperature of the working oil. |
