(1)框式液压机预先泄放回路中的压力 当人们通过适当方式泄放封闭在液压缸中的压力能，再操纵主液压系统，可消除压力冲击。
There is a two-position two-way solenoid valve in the upper chamber oil circuit of the hydraulic cylinder for relieving pressure. When the work is completed, before the main reversing valve is reversed, the pressure relief valve is electrically connected by means of a time relay, about 3 to 5S. When the circuit pressure drops to 0 or close to 0, the main reversing valve is connected again. At this time, there will be no pressure shock. Note that the piping of the pressure relief valve must be small enough (within 6mm diameter), otherwise a new pressure shock will occur. UseBoxHydraulic pressure relief circuit composed of reversing valve and throttle valve, that is, when the electro-hydraulic reversing valve returns to the neutral position, the pressure in the upper chamber of the cylinder is slowly released through the throttle valve and one-way valve, so the hydraulic cylinder does not need special pressure relief.
框式液压机如何消除框式液压机卸荷与换向液压冲击？
(2)Box液压机延长压力泄放时间 液控单向阀普遍应用于大型压力机保压与泄压。液压系统在保压过程中，油的压缩、管道的膨胀和机器的弹性变形所储存的能量在泄压时会突然释放；液压缸在保压终了返回过程中，可能上腔压力未泄完下腔压力已升高，使液控单向阀的卸载阀和主阀心同时顶开，从而引起龙门液压机液压缸上腔突然放油；二者合一，更加剧了液压系统的冲击振动与噪声。