带卸荷阀的液控单向阀常应用在液压系统的保压、释压、锁紧回路中，但在使用中，该阀存在着液压冲击和噪声问题。例如在保压回路中，由于系统在保压过程中，因压力大，油液压缩、管道膨胀和元件发生弹性变形等原因都能储存能量。在泄压时，因能量突然释放，且换向阀在中位移到 Hydraulic check valve with unloading valve is often used in the packing, pressure relief, locking circuit of the hydraulic system, but in use, the valve has hydraulic impact and noise problems. For example, in the packing circuit, because the system in packing process, due to pressure, oil compression, pipe expansion and elastic deformation of components and other reasons can store energy. When pressure relief, the energy is suddenly released and the reversing valve is shifted to the neutral position