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原文
Pilot control valve design considerations Pilot valve with its small size, compact structure, good sealing effect, cut off the high capacity (up to nominal pressure), wide and long life characteristics of the automatic control system has been more widely used. The valve can be used as a vent shut-off valve, in particular, high temperature, high pressure and large diameter cut off the occasion demands. Pilot control valve has a separate top-down structure and flow of the pressure balance valve pilot valve with the valve closed, the pressure through the main valve and sleeve valve closed the gap to generate backpressure, enabling the valve seat sealing, when the pilot valve and main valve must meet specific pressure, the media, the higher the pressure, the valve seal more tightly. When you want to open the valve, so that the implementing agencies to enhance the stem, first open the pilot valve, pilot valve as the main valve and sleeve valve clearance greater flow capacity, the main valve to establish a balance, thus smaller force open the main valve. Pilot control valve flap design in addition to considering the closure of the valve performance, but also consider the stability of the valve performance and adjust properties. Pilot valve seat is greater than the channel flow capacity to meet the guide ring and the sleeve valve and main valve flow capacity of the gap opening and its control on the valve opening of 10%, otherwise the valve will have to fight not unable to open or adjust the small flow range of issues. Design principles to meet the spring stiffness of the spring to resist the media pressure fluctuations, or in the pilot valve and main valve between the vibration and other issues will be. The main function of guide rings is to increase the stability of the valve assembly to limit the main valve and sleeve are designed for temperature causes a large gap caused by the gap flow capacity of the valve seat and the pilot channel flow capacity mismatch. Only role is to control the resale of the pilot valve and main valve flap rotation generated by eddy current trends, and spring is controlled by the pilot valve and main valve flap up and down direction of the vibration of the trend.
原文来自：http://www.tiaojiefa.org

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译文：
先导式调节阀以其体积小、结构紧凑、密封效果好、切断能力高(可达到公称压力) 、适用范围广和使用寿命长等特点, 在自动控制系统中得到越来越广泛的应用。该阀可作放空切断阀使用, 尤其高温、高压和大口径要求切断的场合。　　　　　　先导式调节阀具有自上而下流动的结构及单独的压力平衡先导阀瓣, 随着阀门的关闭, 压力通过主阀瓣与套筒的间隙使阀瓣关闭时产生背压, 有利阀座的密封, 当先导阀瓣和主阀瓣满足必须比压时, 介质压力越高, 阀门密封越严密。当要打开阀门时, 让执行机构提升阀杆, 首先打开先导阀瓣, 由于先导阀阀瓣对主阀瓣与套筒的间隙具有更大的流通能力, 使主阀瓣建立平衡, 从而以较小的力打开主阀瓣。　　　　　　先导式调节阀阀瓣的设计除了要考虑阀门的关闭性能, 还要考虑阀门的稳定性能和调节性能等。先导阀瓣阀座通道要满足流通能力大于导向环及主阀瓣与套筒间隙的流通能力和其开启的开度控制在阀门开度的10 %以下, 否则将会产生阀门打不开或小流量范围无法调节的问题。　　　　　　弹簧的设计原则要满足弹簧的刚度能够抵抗介质压力的波动, 否则在先导阀瓣和主阀瓣之间会产生振动等问题。　　　　　导向环的作用主要是增加阀瓣组件的稳定性, 限制主阀瓣与套筒因温度原因所设计的间隙较大造成间隙流通能力与先导阀瓣阀座通道流通能力不匹配的问题。　　　　　　止转销的作用是控制先导阀瓣和主阀瓣因涡流而产生的转动趋势，而弹簧控制的是先导阀瓣和主阀瓣上下方向振动的趋势。

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