原文：
控制阀， 阀是以管道本身介质压力作为动力源，进行启闭、调节，把前导阀及系统小管路不同组合，就能具有近30种功能，现在逐渐得到较普遍的使用。 先导阀靠作为控制对象的水位和压力的变化而动作，由于导阀种类很多，可以单独使用或几个组合使用，就可以使主阀获得对水位和水压及流量等进行单独或复合调节的功能。但主阀类似截止阀，阀门全开时，其压力损失比其他阀门要大得多，且各个开度损失系数越是与全闭接近，越是剧增，阀门口径越大就越显著。 具有上述特性的阀门，在接近全闭时，阀瓣的动作加速，易发生水锤水的冲击压，接近全闭时，阀门动作越缓慢越好，于是可在阀瓣上设置节流机构。另外先导阀的节流和动作部分要尽量避免设置特小口径的孔口，以免堵塞。必要时要加滤网，定期检修及设置旁通管路。这种阀门发展、使用前景看好。

“ The application of principles of multi-function control valve ”是由提供的阀门行业新闻，译文仅供参考。另外，中国控制阀网还提供相关产品搜索： 、 、 、 、 等。

译文：
.Control valves, medium pressure valve is a pipe itself as a power source, to open and close, regulating, the leading valve and system of small pipes with different combinations, with nearly 30 kinds of functions can now be gradually more widespread use.  Pilot valve by a control object to changesin water level and pressure action, as many types of pilot valve can be used alone or several combined, they can get on the water main valve and the water pressure and flow rate adjusted separately or combined function. However, the main valve similar to the valve, the valve fully open, the pressure loss is much higher than the other valve, and opening all the more with the loss coefficient close to fully closed, the more dramatic increase, the greater the more the valve diameter significant.  With the characteristics of the valve, close to the fully closed, the valve flap moves accelerated prone to the impact of water hammer pressure of water, close to the fully closed, the valve moves more slowly as possible, so can set the throttle valve in the valve institutions. Another pilot throttle valve and set the action in part to avoid special small diameter orifice, in order to avoid congestion. Necessary to add the filter, regular maintenance and setting pass line. The valve, the use of promising.