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四.液压阀内部渗漏的修理图7为150吨四柱油压机保压阀的结构图。该阀由液控单向阀、背压阀和单向阀组成。当压机开始工作,活动平板需要向下移动时,油泵的油经三位四通阀进入A腔顶开锥阀1,从B腔流入油缸上腔,推动活动平板向下移动;此时滑阀3在左端位置,油缸下腔的油顶开背压阀4流回油箱。当活动平板需要向上移动时,油泵的油经三位四通阀进入D腔使滑阀3向右端移动,先顶开阀杆2使高压卸荷,然后再顶开锥阀1使油缸上腔回油;同时压力油从c腔进入b腔,流入油缸下腔使活动平板上升。在这里滑阀3的移动起到一个单向阀
Four hydraulic valve internal leakage repair Figure 7 for the 150-ton four-column hydraulic machine pressure valve structure. The valve by the hydraulic check valve, back pressure valve and check valve. When the press starts to work, the movable plate needs to move downwards, the oil of the oil pump goes through the three-position four-way valve into the A cavity top open cone valve 1, flows into the upper chamber of the cylinder from the B cavity and drives the movable plate to move downward; Valve 3 in the left end position, the fuel tank under the open top back pressure valve 4 flows back to the tank. When the moving plate needs to move upward, the oil of the oil pump enters the D cavity through the three-position four-way valve to make the spool valve 3 move to the right end, first open the valve stem 2 to unload the high pressure and then open the cone valve 1 to make the upper chamber of the cylinder Back to the oil; at the same time the pressure oil from the c cavity into the b cavity, into the lower chamber of the cylinder so that the activity plate rise. Here, the movement of the slide valve 3 serves as a one-way valve