原文：
            在水泵输水管路系统中，当突然停泵时，泵出口止回阀迅速关闭，致使阀出口管路中循环流速突然下降，并产生回流冲击压力，速度突变会产生冲击压力波传递，传递速度很高，可以使阀出口段压力升高至额定压力的数倍，这就是管路中的水锤现象，它可以导致阀或管道破裂，产生事故。为了避免这类事故，目前人们都是采用具有延迟关闭特性的阀门，如两阶段控制关闭蝶阀、具有子母阀板的水力控制阀、缓闭止回阀等，使阀门延迟关闭，部分水通过泵与转子部件回流以达到泄压消除水锤压力的目的。但由于泄压时间较长，回流的水长时间冲击泵的叶轮，使泵转子部件反转速度加快，时间长会损坏泵转子部件及与之相联的电机转子部件。 为了解决以上问题，有必要设计一种装于旁通管路上的自动泄压阀，它可以在泄压时间内将回流引至泵进口，即泄压回流不再通过泵转子部件，完成呼吸阀泄压能自动关闭，彻底解决了泄压回流冲击泵反转的问题，并达到有效消除水锤的目的。

         1 结构设计 该阀由阀体、液压腔、液压管a和液压管b组成。阀体为一四通管，内有液压传动杆、下阀板、上阀板，液压传动杆两端带有螺纹。阀体下部通过联接螺钉与底盖联接，阀体上下两侧各有一个进出水口与管道联接，阀体内中部靠近上进出水口处有密封座，上阀板通过焊接与液压传动杆联接，下阀板通过螺母、液压传动杆一端的螺纹与液压传动杆联接，阀体上部通过法兰与液压腔联接。液压腔由液压腔座、液压腔盖、液压腔体和活塞组成，通过螺杆、螺母与阀体联成一体，液压腔座上有液压腔座套，活塞减压阀在液压腔体内，液压传动杆通过液压腔座套用螺母、液压传动杆一端的螺纹与活塞联接。活塞将液压腔分为上腔和下腔，活塞上有“O”形密封圈，通过活塞上的“O”形密封圈与液压腔体内壁压紧密封，使液压腔上下两腔完全隔离。液压腔盖上开有通流孔，液压管a通过通流孔与液压腔上腔接通。液压腔座上开有通流孔，与液压腔下腔连通液压管b通过通流孔与液压腔下腔接通。 在上阀板、下阀板、液压腔座套上安装“O”形密封圈，在液压腔盖与液压腔体之间的止口配合面上安装密封垫，在液压腔体与液压腔座之间的止口配合面上安装密封垫，在液压腔座与阀体之间的止口配合面上安装密封垫，在阀体与底盖之间和止口配合面上安装密封垫。在液压管a上安装过滤器、调节阀微止回阀，在液压管b上安装过滤器、调节阀。在液压腔盖上开有通流孔，通过通流孔再联接液压管c，其上装有微止回阀液压腔盖上方安装放气螺塞。液压腔盖上安装放气螺塞，可以用来放掉液压腔上腔的气体。 液压腔由液压腔座、液压腔盖、液压腔体和膜片上板、膜片、膜片压盖组成，膜片上板、膜片、膜片压盖在液压腔体内，膜片上板在膜片上面，膜片压盖在膜片下面，液压传动杆通过液压腔座套，用螺母、液压传动杆一端的螺纹与膜片压盖、膜片、膜片上板联成一体，液压腔盖、膜片与液压腔腔体之间通过螺杆、螺母联接，膜片将液压腔分为上下两腔，并使上下两腔完全隔离。

         2 工作原理与功能 具有上述结构的旁通液控泄压阀，用于输送流体管路系统中，它装在泵出口止回阀出口侧旁通泄压管道上，可实现如下功能和使用效果。当泵处于起动状态时，安全阀与液压管接通的液压腔下腔压力高于与液压管接通的液压腔上腔压力，在压力差作用下，活塞向上移动并通过液压传动杆带动下阀板向上移动，此时，下进出水口有液体进入，并通过阀体从上进出水口流出。当活塞向上移动并通过液压传动杆带动下阀板向上移动，直至下阀板与阀体内的密封座接触时，下阀板上的“O”形密封圈5被压缩起密封作用，此时，上进出水口和下进出水口内无液体流动，此时，泵及管路系统处于正常工作状态，液压腔盖上联接的液压管可以加快液压腔内液体流动的速度，从而使这个过程迅速进行。 当突然停电时，止回阀自动关闭，此时液压腔上腔的压力大于液压腔下腔的压力，活塞在压力差的作用下向下移动并带动下阀板向下移动，平衡阀“O”形密封圈失去密封作用，上进出水口内有液体流入并经阀体由下进出水口排出，同时，上阀板亦在液压传动杆的带动下同步向下移动直至与阀体内的密封座接触，“O”形密封圈被压缩起密封作用，此时，上进出水口内停止液体流入，液压作用消除。从下阀板与上阀板同时向下移动，“O”形密封圈失去密封作用开始到“O”形密封圈起密封作用这段时间就是泄压时间。 密封垫用来保证液压腔内的液体不外泄，密封垫用来保证阀体内的液体不外泄。液压腔座套上的“O”形密封圈用以隔离液压腔与阀体内的液体。为了调节泄压时间，在液压管上装有调节阀，泄压时间可以通过调节阀来控制液压腔内上下腔液体的流入、流出速度来调节。在液压管上装有过滤器，用以过滤液体中杂质，保证液压腔内清洁。在液压管上装有微止回阀，可以用来对流入液压腔上腔的水流进行节流。该阀动作灵活，关闭时间可调(最快15s，最慢348s)，对于复杂管网系统，消除水锤效果好，截止阀彻底解决了两阶段关止回阀慢关时间长、回水冲击泵反转的问题。

           3 应 用 已设计制造口径80mm，150mm，300mm的3种泄压阀，公称压力1.6MPa，应用于自来水、冶金冷却循环水、石化冷却循环水管道系统，经近1年的运行证明，该阀动作灵活，关闭时间可调，对于复杂管网系统，消除水锤效果好，彻底解决了两阶段关止回阀慢关时间长、回水冲击反转的问题。说明阀的结构与性能设计方法可行，参数选择准确。 旁通液压控制泄压阀安装在主管道中止回阀出口侧的旁通管道上，与止回阀配合使用，利用管道中有压液体来实现驱动和自动控制，彻底解决了传统的两阶段关闭阀消除水锤压力时泄流使泵转子部件反转问题。由于它具有关闭时间可调的功能，适用于各种复杂管路消除水锤压力，是一种具有推广应用价值的新型泄压阀。

“ 旁通液压控制泄压阀结构设计与工作原理 ”是由中国球阀网提供的阀门行业新闻，译文仅供参考。另外，中国球阀网还提供相关产品搜索： 电动球阀、 气动球阀、 高压球阀、 法兰球阀、 对夹球阀 等。

译文：
         Water pipeline system in the pump, when the pump stops suddenly, the pump outlet check valves quickly closed, resulting in the export pipeline valve in the circulation flow rate suddenly dropped, and generate return shock pressure, speed of mutation will produce shock pressure wave transmission, transfer high velocity, the pressure can rise to the valve exit of several times the rated pressure, which is the line of water hammer phenomenon, which can lead to valve or pipeline rupture, resulting in the accident. In order to avoid such incidents, people are using the current characteristics of the valve closed with delay, such as the closure of two-stage control valve, hydraulic valve plate has a picture-control valve, relief valve closed, so that the valve closure delay, some of the water back through the pump and the rotor components to achieve the relief the purpose of eliminating water hammer pressure. However, pressure relief long time, back to Regulatorsthe impact of the water pump impeller long to reverse the pump rotor component accelerated a long time will damage the pump rotor Department With associated parts and rotor parts. To solve this problem, it is necessary to design a bypass pipeline installed in the automatic pressure relief valve, relief time it will be back in the lead to the pump inlet, the pressure relief back through the pump rotor is no longer spare parts and complete relief automatically shut down, completely solved the impact of pump pressure relief back reversal problems, and achieve the purpose of effectively eliminate water hammer. 1 Design The valve from the valve body, hydraulic chamber, hydraulic tube composed of a and b hydraulic tube. A four-way control valve, hydraulic drive rod within the lower valve plate, the valve plate, hydraulic rod ends with thread. Lower body connection through the connection screws and bottom cover, the upper and lower body on each side of a water inlet and outlet pipes connected with the valve body near the central office with a sealed inlet and outlet seat, the valve plate by welding rod connected with the hydraulic transmission, the next valve board through the nut, hydraulic rod end and hydraulic rod threaded connection, the upper body cavity through the flange and the hydraulic connection. Block by the hydraulic chamber hydraulic chamber, hydraulic cavity cover, hydraulic piston chamber and the composition of the screw, nut and body together into one seat with hydraulic hydraulic chamber cavity seat covers, piston in the hydraulic chamber, hydraulic rod through hydraulic chamber seat cover with nuts, hydraulic piston rod connected at one end of the thread with. Piston into the hydraulic chamber and lower chamber on the chamber, piston with "O" ring, through the piston "O" ring hydraulic chamber wall and compress the seal, so that the upper and lower hydraulic chamber completely separate the two cavities. Hydraulic chamber to open a flow passage hole cover, hydraulic tube a hole through the flow passage connected with the hydraulic chamber on the chamber. Hydraulic Flow chamber seat to open a hole, connected with the hydraulic chamber of hydraulic tube b vena flow through the hole and the hydraulic cavity through the inferior vena connected. In the valve plate, under the valve plate, the hydraulic chamber seat cover to install "O" ring, hydraulic pressure in the hydraulic chamber cover and the only oral cavity with the surface between the gasket installed in the hydraulic chamber and the hydraulic cavity Block only the surface between the mouth with the installation of seals in the hydraulic chamber and the valve seat with the Mouth of the surface between the gasket installed in the valve body and the bottom cover and the only port with the surface between the gasket installed. Installed in the hydraulic tube a filter, control valve micro check valve, installed in the hydraulic tube b filter, regulating valve. Covered in the hydraulic chamber to open a flow passage holes, through holes and then connected through flow of hydraulic pipe c, its equipped with a micro-cavity covered with side installation of hydraulic valve deflated Plug. Cover installation of hydraulic chamber deflated Plug can be used to let go of hydraulic chamber on the gas chamber. Block hydraulic chamber by the hydraulic chamber, hydraulic cavity cover, hydraulic chamber and the membrane on the plate, diaphragm, diaphragm gland composition, patch on the plate, diaphragm, membrane gland in the hydraulic chamber, membrane and diaphragm plate above the diaphragm gland below the diaphragm, hydraulic rod by hydraulic pressure chamber seat cover with nuts, hydraulic rod end of the thread and diaphragm gland, diaphragm, diaphragm on the board into one, the hydraulic chamber cover, the membrane film and between the hydraulic chamber cavity by screw and nut connection, patch the hydraulic chamber is divided into upper and lower chamber, and to completely isolate the upper and lower chamber. 2 Principle and features With the structure of the bypass pressure relief valve hydraulic control for the transmission fluid piping system, it installed in the pump pressure relief valve exit side of the bypass pipe can be used to achieve the following functions and effects. When the pump is starting state, and hydraulic pipe connected to the hydraulic chamber cavity under higher pressure than the hydraulic and hydraulic tubes connected to the pressure chamber on the chamber, the pressure difference effect, the piston moving up and driven by hydraulic lever valve plate move up, this time,Motorized Valve Actuators water is under the water inlet and outlet, and through the body from the water inlet and outlet flow. When the pistons move up and driven by hydraulic lever valve plate upward, until the valve plate and valve body sealing seat contact, valve panel under the "O" ring 5 is compressed seal, this time, on the water inlet and outlet and inlet and outlet within the next without fluid flow, this time, pump and piping system in normal working condition, the hydraulic connection of the hydraulic control chamber cover can speed up the rate of flow of hydraulic fluid cavity, so that the process quickly. When a sudden power failure, the valve automatically closes, this time on the hydraulic chamber is greater than the pressure chamber cavity under hydraulic pressure chamber, the pressure difference in the role of the piston moving down, and driven under the valve Globe Valvesplate moves down, "O" ring loss of containment, the liquid flows within and out of outlet and inlet and outlet by the body from the next discharge, the same time, the valve plate also driven by hydraulic rod moving up and down simultaneously sealing the valve body seat contacts "O" ring is compressed seal, this time, the inlets and outlets to stop fluid flow, elimination of hydraulic effect. From the valve under the valve plate and the plate while moving down, "O" ring began to lose containment "O" ring sealed role this time is the relief of time. Gasket to ensure no leakage of hydraulic fluid cavity, valve body gasket used to ensure the liquid does not leak. Hydraulic chamber seat cover on the "O" ring for the hydraulic isolation chamber and the valve body fluids. Relief time to adjust, in the hydraulic pipe with control valve, pressure relief valve can be adjusted to the time control of the upper and lower chamber of hydraulic fluid into the cavity, to adjust the flow rate. In the hydraulic tube fitted with filters for filtering impurities in the liquid to ensure the hydraulic cavity clean. In the hydraulic tube with micro-check valve, into the hydraulic chamber can be used on the cavity of the flow in throttling. The valve action flexible, adjustable closing time Multi-functional Water Pump Control Valves(the fastest 15s, slowest 348s), for complex systems, and eliminate water hammer effect, completely solved the slow turn-valve two-stage Guan long, backwater pump anti-shock transfer problem. 3 should be used Has been designed and manufactured caliber 80mm, 150mm, 300mm of three kinds of pressure relief valve, nominal pressure 1.6MPa, used in tap water, cooling water circulation metallurgy, petrochemical cooling circulating water piping system, after nearly a year to run shows that the valve is flexible, closing time is adjustable, for complex systems, and eliminate water hammer effect, solve the two-stage off valve slowly off for a long time the issue reversal backwater impact. Explain the structure and properties of valve design is feasible and accurate parameters. Bypass pressure relief valve hydraulic control in the check valve installed in the main channel outlet side ofWater Power Control Valves the bypass pipe and valve used in conjunction with the use of pressure pipe in drive and automatic control of liquid to achieve a thorough solution to the traditional two-stage closure Valve Discharge Elimination of water hammer pressure to pump rotor components inversion problem. Because of its closing time adjustable features for complex pipeline to eliminate the water hammer pressure, is a kind of value to promote a new relief valve.

原文来源：http://www.1qiufa.com/

2010-08-31 08:54

返回