| 摘要 |
<p>An hydraulic valve assembly controls the supply of hydraulic fluid to an hydraulic strut 3 of a vehicle suspension 30 and is formed in a valve block (10) having an hydraulic delivery line 101 between a pump delivery port 100 and the strut via a check valve 102 which allows flow in one direction only from the pump 2 to the strut. Three parallel hydraulic lines 105, 106 and 107 connect the delivery line 101 to a fluid return line 142. One line 105 has a relief valve 109 that only opens if there is excess pressure in the delivery line 101. Another line 106 has a series connection of a solenoid-operated pressurizing valve 110 and a pressure-sensing valve 111. Both valves 110 and 111 are normally open, the soleneid-operated valve being closed when the suspension 30 becomes too low, and the pressure-sensing valve 111 closing when pressure at the strut port 103 falls. The other hydraulic line 107 includes a normally-closed solenoid-operated depressurizing valve 113 and a normally-open relief valve 114. The depressurizing valve 113 is opened when the suspension becomes too high, the relief valve 114 closing when pressure falls to a minimum safe level for the strut 3.</p> |
