液压阀的品种繁多，除了不同品种、规格的通用阀外，还有许多专用阀和复合阀。
Hydraulic valves of a wide variety, in addition to different varieties, specifications generic valves, there are many specialized valves and complex devices.
在注塑机液压系统中，要求能在注塑油缸运动的过程中对其进行速度控制和在保压过程中进行压力控制。 这就需要用到压力-流量复合阀来进行压力和流量的控制。
The hydraulic system of injection molding machine is the representative example, it need to control cylinder speed and hold pressure, so it indeed to use pressure and flow rate multiple valve.
试验结果表明：浮阀筛孔复合塔板操作弹性小、气液处理量小；
The results show that valve-sieve compound trays have smaller turndown ratio and smaller capacity.
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