| 摘要 |
<p>A load sense pressure controller used with a hydraulic control valve such as a hydraulic direction control valve 10 includes a body 31 in the form of a barrel having a threaded first end 46 and a threaded second end 84. An externally threaded first plug 48 is threaded into the first end of the body and an externally threaded second plug 82 is threaded into the second end of the body. Both first and second plugs each have passages therethrough wherein the passage 49 through the first plug is connected to the load sense passage 23 from a valve and the passage 89 through the second plug is connected to a tank passage 22 in the control valve 10. Disposed between the first and second plugs is a piston 72 which is biased by a coil spring 90 toward the first plug 48. The piston has a stepped axially extending passage 73, 74, 75 extending therethrough which is intersected by a radially extending passage 100. The radially extending passage normally aligns with lateral openings 102, 104 in the body so that when there is a load sense condition, hydraulic fluid flows through lateral openings 102, 104 in the body to the return passage 22. If the load sense pressure exceeds a selected high pressure, then all of the load sense fluid is throttled through the pressure controlling orifice 75 in the piston 72 to the tank passage of the control valve 10. <IMAGE></p> |
