| 摘要 |
PROBLEM TO BE SOLVED: To provide a relief valve with less chattering in a hydralic circuit for tractors. SOLUTION: A primary poppet which has a primary orifice 4 through which the hydraulic pressure of a pump port sent from a hydraulic pump P is passed, and which is opened and closed against a primary spring 5, is provided. A valve sleeve having a secondary orifice 7 through which the hydraulic pressure passed through the primary orifice 4 is passed, is provided. In this valve sleeve, a secondary poppet which is opened and closed by the hydraulic pressure passed through the secondary orifice 7 against a secondary spring 9 and a pilot pressure, is provided. |
