原文：
提要：装设在离心泵出水管上的新型多功能水泵控制阀同时具有闸阀、逆止阀、水锤xx器三种功能。本文介绍了多功能水泵控制阀的构造、性能参数、工作原理、安装调试、注意事项。 一、多重功能水泵控制阀功能要求 离心泵是给排水工程中最常用的一种水泵，通常为了保证水泵的正常运行，在水泵的出水管上根据需要装设有闸阀、逆止阀以及水锤xx器三种阀件，这三种阀件在水泵的运行过程中分别起着不同的作用：闸阀平时是处于关闭状态，水泵启动时闸阀慢慢打开，水泵停机时，闸阀先慢慢关闭。水泵的闭闸启动和闭闸停车，可以有效的防止开泵水锤和停泵水锤，同时，减少了水泵启动时的电机负荷，水泵在零流量时的轴功率最小，一般仅为设计轴功率的30％。闸阀的另一个功能是，当闸阀关闭时，可以为安装在闸阀与水泵之间的逆止阀等阀件和水泵提供安全的检修条件，防止压水管的水回流；逆止阀能防止突然断电时所造成的水流的流向改变，防止倒流；但是，逆止阀的突然关闭易产生水锤现象。在水泵的几何扬水高度较大时，严重的水锤瞬间高压会导致管道破裂，发生严重的生产事故。防止水锤对输水管道的破坏方法，往往在水泵的压水管上安装水锤xx器。为了实现水泵运行的自动化，简化管理，减轻劳动，提高可靠性，人们用水力阀门和电动阀门取代手动阀门，对单体阀门进行多项技术改进，出现了缓开缓闭逆止阀、缓动启闭水力阀门、自动缓闭闸阀、双速自闭阀等新型阀门。 以上措施在应用实践中取得了一定的效果，但仍不尽人意，使用压力传感和电气传动控制复杂故障较多，单一阀门的改进不能解决自动运行的主要问题。所以，人们一直致力于研制一种同时具有闸阀、逆止阀和水锤xx器三种阀件功能的阀门，在减少占地的同时满足上述综合要求。JD745X型多功能水泵控制阀是其中较好的一种，它具有一阀多能、运行可靠、简化操作、便于维护，能按水泵的操作要求自动运行的优点，很受到用户的欢迎。 该型多功能控制水泵阀的工作压力分1．0MPa和1．6MPa、2．5MPa三种，动作压力大于或等于O.1MPa，介质温度在0－－80℃，缓闭时间可在3-90s内调节，管道流速2m／s时的压力损失小于0．01MPa,水锤峰值小于1．5倍的工作压力，公称口径DN50-DNl0000。 二、基本构造 阀门的总体尺寸与普通逆止阀相当，由主阀和外装附件组成。其中，主阀包括阀体、压板及膜片、大阀板、缓闭阀板、阀座、阀杆组件等部件。缓闭阀板用阀杆组件与压板及膜片连接一起，膜片压紧在阀盖与膜片座之间，膜片的上下运动带动缓闭阀板上下升降。阀杆穿过大阀板的中心孔，因之大阀板可以在一定的范围内沿阀杆滑动。平时，大阀板在自重和上部压紧弹簧的压力下压紧在阀座上， 使阀门处于关闭状态。多功能水泵控制阀的外装附件安装在阀门膜片两侧与阀门进、出水管上，膜片的下腔与阀门进水侧的连接管上装设控制阀、过滤器和一只特制的逆止阀。膜片的上腔与阀门的出水侧的连接管上只设过滤器和一只控制阀。主阀内大阀板和缓闭阀板的运动和所处的位置决定了阀门工作状态的变化和启闭。阀门的外装附件和管路随时把阀门前后的压力变化传递到阀门内由膜片分成的上腔和下腔，控制大阀板和缓闭阀板的运动，并可以通过调整附件改变大阀板与缓闭阀板的运行速度，使阀门的开启与缓闭时间处于规定的范围内。 三、工作原理 多功能水泵控制阀在水泵的启动－－关闭时是自动工作的，以下分别阐述其工作过程原理： （1）停泵状态，阀板在出口端及隔膜上腔静压作用下全部关闭。

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译文：
Abstract: installed at the pump outlet pipe on the new multi-functional water pump control valve also has a gate valve, check valve, water hammer eliminator three functions. This article describes the construction of multifunctional pump control valve, performance parameters, operation principle, installation, pay attention. 1, multi-functional water pump control valve functional requirements Centrifugal pump is the most commonly used for drainage of a pump, usually in order to ensure the normal operation of pumps in the pump's outlet pipe on the basis of need for the installation of a gate valve, check valve and water hammer arrester three types of valves, The three valves in the pumps were running the course plays a different role: valve normally is turned off, pump start valve slowly opened, pump shutdown, the valve slowly before closing. Pump closed gates closed and parking brake boot, can effectively prevent water hammer and open the pump Water hammer, while reducing the pump motor load at startup, when the pump flow rate at zero minimum shaft power, the general design axis only power of 30%. Another function of gate valve, when the valve is closed, can be installed in the valve and check valve between the pump valves and pumps such as the maintenance of safe conditions, to prevent the pressure of the water return pipe; check valve to prevent a sudden power outage caused by changes in the flow of water to prevent backflow; However, the sudden closure of check valve is easy to produce water hammer. Geometry in the pump when pumping high degree of large, serious water hammer pressure will lead to pipeline rupture moment, serious industrial accidents. Prevent water hammer damage to the pipeline method, often the pressure of water pump install water hammer eliminator. In order to achieve automatic pump operation, simplify management, reduce labor, improve reliability, force people to water valves and replace the manual valve electric valve, single valve on a number of technical improvements, there has been slow to open Slow Close Check valve, slow moving water valve open and close automatically slow closing valve, the two-speed self-closing valves, and other new valve. Practice in the application of these measures to achieve a certain effect, but is still unsatisfactory, use of pressure sensing and control of electric drive failure are more complex, the improvement can not solve a single valve automatically run the main problem. Therefore, it also has been working to develop a gate valve, check valve and water hammer arrester valve function of three valves in the reduction of the land, while meeting the comprehensive requirements. JD745X multifunctional pump control valve is one of the better kind, it has more than one valve can, reliable, simplified operation, easy maintenance, the pump can operate requirements according to the advantages of automatic operation, it is by the users. The multi-functional water control valve working pressure points 1.0MPa and 1.6MPa, 2.5MPa of three, action pressure greater than or equal O.1MPa, medium temperature 0 - 80 ℃, slow closing time in 3 -90s within the regulator, pipe flow velocity 2m / s, pressure loss is less than 0.01MPa, water hammer peak is less than 1.5 times the working pressure, nominal diameter DN50-DNl0000. Second, the fundamental structure The overall size of the valve and check valve fairly common, from the main valve and the composition of exterior accessories. Which include the main valve body, pressure plate and diaphragm, a large valve plate, slow closing valve plate, valve seats, valve stem component and other components. Slow closing valve plate and the plate with the stem and the diaphragm to connect components together, diaphragm compression seat in the valve cover and the diaphragm between the diaphragm drive slowly up and down movement under the closed valve plate movements. Large valve stem through the center hole plate, consequent large valve plate to a certain extent along the stem slide. Normally, large valves and upper compression plate in the weight under the pressure of compression springs in the seat, so that the valves are closed. Multifunctional Pump Control Valve exterior accessories installed in the valve diaphragm and the valve into the side, outlet pipe, the diaphragm and the valve inlet side of the inferior vena connection pipe installed control valves, filters and a special valve. Membrane of the chamber and the valve connecting the water pipe on the side of the set only and a control valve filter. Large valve plate main valve closed valve plate gentle movement and location determines the valve opening and closing working condition changes and. Valves and piping exterior accessories at any time before and after the valve pressure delivered to the valve diaphragm within a chamber divided into upper and lower chamber, control of large valves Ban relaxed closed valve plate of the movement, and can be adjusted by changing the large attachments valve plate and the slow speed valve plate closed, so that relief valve is opened and closed at a specified time range. Third, the working principle Multifunctional Pump Control Valve in the water pump start - shut down automatically when the work is, explain the working process the following principles were: (1) state the pump stops, the valve plate and diaphragm at the exit static pressure on the cavity under the action of all closed.