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原文
How integrated check valve throttle Check valve in the hydraulic circuit is widely used, but in the application of this valve should fully consider the characteristics of the valve, otherwise it will cause loop instability, especially in high-pressure systems, reverse-open pilot-operated check valve before the high pressure port P2, in order to reduce the control pressure in the hydraulic system, hydraulic shock and noise, using also unloading the hydraulic check valve spool. Unloading valve check valve performance can be improved, the check valve feature is that when the pilot-operated check valve port K is no oil pressure, the pressure oil can only flow from port P1 Port P2 , not the reverse. When the control port K has control pressure oil, the oil control piston driven by mandrel, and the top peak of the staff unloading valve to open, while the main valve open, connected to P1, P2 two openings, the fluid in the two directions on the free flow of hydraulic unloading valve reduces the impact of the hydraulic check valve performance more stable, but high-pressure system in the large flow remains shock or noise. Check valve is often used in packing, pressure relief, locking loop. As the system pressure during the PICC, because of pressure, fluid compression, pipeline expansion, components such as elastic deformation energy can be stored in the relief, the sudden release of renal volume, and valve bits from bit to the left , due to pressure on the cylinder chamber, this time under the chamber pressure is increased, the unloading valve to open almost simultaneously with the main valve, so that the oil pressure chamber through the check valve suddenly released into the return line. As the two reasons we exist after leaving the holding pressure relief too soon, resulting in shock and vibration and noise, for which we have that type of hydraulic circuit has been improved. As the high pressure high flow check valve resulted in rapid relief, so that the impact increases, this in the loop with a throttle valve, so that the check valve unloading valve opens first, and then open the main valve, the throttle flow control with a sufficient range to ensure a stable minimum flow, convenient adjustment, leakage is small, temperature and pressure on impact is small, so by adjusting the throttle valve to control the oil on the cylinder chamber decompression time is extended, the Department will enhance the ability of pressure, hydraulic oil return on the impact of the various components and noise. Its safety has been high-pressure high flow check valve of the circuit for the same improvement, the result can meet the requirements, does not affect the control piston speed.
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译文：

译文：
液控单向阀在液压回路中应用十分广泛，但在应用此阀时，应充分考虑该阀的特点，否则会造成回路不稳定，尤其是在高压系统中，液控单向阀反向开启前P2口的压力很高，为了减小液压系统中的控制压力，液压冲击和噪声，采用了还卸荷阀芯的液压控单向阀。卸荷阀能使液控单向阀性能得到改善，该液控单向阀的特点是，当液控单向阀口K处于无压力油时，压力油只能从油口P1流向油口P2，不能反向。当控制口K有控制压力油时，油液因控制活塞推动顶杆，而顶杆顶开卸荷阀芯，同时主阀芯打开，接通P1、P2两通口，油液可在这两个方向上自由流通，卸荷阀减小了液压冲击，使液压控单向阀的性能较稳定，但在大流量高压系统中仍存在冲击或噪声。　　液控单向阀常应用在保压，泄压，锁紧回路中。由于系统中保压过程中，因压力大，油液压缩、管道膨胀，元件发生弹性变形等都能贮存能量，在泄压时，肾量突然释放，并且在换向阀从中位到左位时，由于液压缸上腔压力较大，此时下腔压力已升高，卸荷阀与主阀几乎同时打开，使上腔的压力油突然通过液控单向阀释放到回油路。由于这两咱原因同时存在而使保压后泄压太快，产生冲击振动和噪声，为此我们对该类液压回路进行了改进。　　由于高压大流量液控单向阀导致了泄压过快，使冲击增大，为此在该回路中加上一节流阀，从而使液控单向阀卸荷阀先打开，然后再打开主阀，由于节流阀具有足够的流量控制范围，能保证稳定的最小流量，调节方便，泄漏小，温度和压力对影响也小，所以通过调节节流阀，控制液压缸上腔的油液泄压时间也相应延长，汇压能力也会增强，送还上液压油对各元件的冲击及噪声。曾对其安高压大流量液控单向阀的回路进行了同样的改进，结果都能满足要求，不影响控制活塞的速度。

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