直通型水击预防阀是以管路系统上下游压力差△p为动力，由导阀控制，使隔膜(活塞)液压式差动操作，完全由水力自动调节，从而使主阀阀盘完全开启、完全关闭或处于调节状态。当进入隔膜(活塞)上方控制室内的压力介质被排到大气或下游低压区时，作用在阀盘底部和隔膜下方的压力值大于上方的压力值，依靠管路介质将主阀阀盘推到完全开启的位置：当进入隔膜(活塞)上方控制室内的压力介质不能排到大气或下游低压区时，作用在隔膜(活塞)上方的压力值大于下方的压力值，管路中的介质将主阀阀盘压到完全关闭的位置;当隔膜(活塞)上方控制室内的压力值处于人口压力与出口压力之间时，主阀阀盘处于调节状态，其调节位置取决于附设管路系统中针阀和可调导阀的联合控制作用。可调导阀可以通过下游的出口压力并随它的变化而自动调节其自身阀口的开度，从而改变隔膜(活塞)上方控制室的压力值，控制主阀阀盘的调节位置。
The straight-through water hammer prevention valve is powered by the pressure difference △ p between the upstream and downstream of the pipeline system, controlled by a pilot valve, which enables hydraulic differential operation of the diaphragm (piston) and fully hydraulic automatic regulation, thereby making the main valve disc fully open, fully closed, or in a regulated state. When the pressure medium entering the control chamber above the diaphragm (piston) is discharged into the atmosphere or downstream low-pressure zone, the pressure value acting on the bottom of the valve disc and below the diaphragm is greater than the pressure value above. The main valve disc is pushed to the fully open position by relying on the pipeline medium. When the pressure medium entering the control chamber above the diaphragm (piston) cannot be discharged into the atmosphere or downstream low-pressure zone, the pressure value acting on the diaphragm (piston) above is greater than the pressure value below, The medium in the pipeline presses the main valve disc to the fully closed position; When the pressure value in the control chamber above the diaphragm (piston) is between the population pressure and the outlet pressure, the main valve disc is in an adjustable state, and its adjustment position depends on the combined control effect of the needle valve and adjustable pilot valve in the attached pipeline system. The adjustable pilot valve can automatically adjust the opening of its own valve port according to the downstream outlet pressure, thereby changing the pressure value of the control chamber above the diaphragm (piston) and controlling the adjustment position of the main valve disc.
直通型水击预防阀按用途可分为哪些种类
What types of straight through water hammer prevention valves can be classified according to their purpose
1)水位控制阀。主要控制水池、水塔中的水位。
1) Water level control valve. Mainly controls the water level in the pool and water tower.
2)减压阀。将较高进口压力减小到某一需要的出口压力，并依靠介质自身的能量，使出口压力自动保持稳定的阀门。
2) Pressure reducing valve. A valve that reduces the higher inlet pressure to a desired outlet pressure and relies on the energy of the medium itself to automatically maintain a stable outlet pressure.
3)水用阀(泄压/持压阀)。当给水管路系统中的压力超过设定压力时，阀门自动开启泄压，保护管线。
3) Water safety valve (pressure relief/holding valve). When the pressure in the water supply pipeline system exceeds the set pressure, the valve automatically opens to relieve pressure, protecting the safety of the pipeline.
4)止回阀。安装在给水系统的水泵出口，防止介质倒流，并水击。
4) Check valve. Installed at the outlet of the water pump in the water supply system to prevent medium backflow and eliminate water hammer.
5)电动开关阀。以电磁阀作为先导阀，根据电信号，遥控开启和关闭给水管路系统，可取代用来开启和关闭的闸阀和蝶阀的大型电动装置，并可实现远程控制。
5) Electric on/off valve. Using an electromagnetic valve as a pilot valve to remotely open and close the water supply pipeline system based on electrical signals can replace large electric devices used to open and close gate and butterfly valves, and can achieve remote control.
6)400X流量控制阀。将过大的流量限制在一个预定值，并将上游的高压减为所需要的下游低压。
6) 400X flow control valve. Limit excessive flow to a predetermined value and reduce the upstream high pressure to the required downstream low pressure.
7)800X压差旁通平衡阀。用于空调系统供水管、回水管或集水器、分水器之间，控制供水管、回水管或集水器、分水器之间的压差为设定值。
7) 800X differential pressure bypass balance valve. Used for controlling the pressure difference between the water supply pipe, return pipe, or water collector and water distributor in the air conditioning system as the set value.
8)900X紧急关闭阀。用于消防用水与生活用水并联的供水系统中，自动调配供水方向。
8) 900X emergency shut-off valve. Used in a water supply system with parallel connection between fire water and domestic water, automatic allocation of water supply direction.
9)JM744X膜片式快开排泥阀。安装在沉淀池底部池壁外，用以排除池底沉淀的泥沙和污物。
9) JM744X diaphragm type quick opening mud discharge valve. Installed outside the bottom wall of the sedimentation tank to remove sediment and dirt from the bottom.
10)JM742X隔膜式池底卸泥阀。安装在沉淀池的底部，排除池底的泥沙和污物。
10) JM742X diaphragm bottom sludge discharge valve. Installed at the bottom of the sedimentation tank to remove sediment and dirt from the bottom.
直通型水击预防阀如何选型
How to Select a Straight-through Water Hammer Prevention Valve
(1)型号的选择 选择GA5700直通型水击预防阀的型号，主要根据用途去选择，当确定了用途、介质、温度和工作压力后，选择所需要的型号。
(1) The selection of model is mainly based on the purpose of the GA5700 straight through water hammer prevention valve. After determining the purpose, medium, temperature, and working pressure, select the desired model.
(2)结构型式的选择 选择GA5700直通型水击预防阀的结构型式，主要取决于管路系统中的水质。当水质比较差时，优先选用直流式中的膜片式结构，由于直流式的结构特点，阀座在阀体内腔呈倾斜状态，水中的杂质不易停留在密封面上，因此不受水质的影响，始终能保证动作灵活。
(2) The selection of structural type for the GA5700 straight through water hammer prevention valve mainly depends on the water quality in the pipeline system. When the water quality is relatively poor, the diaphragm type structure in the direct current type is preferred. Due to the structural characteristics of the direct current type, the valve seat is inclined in the inner cavity of the valve body, and impurities in the water are not easy to stay on the sealing surface. Therefore, it is not affected by the water quality and can always ensure flexible action.
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