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.

直通型水擊預防閥按用途可分為哪些種類

What types of straight through water hammer prevention valves can be classified according to their purpose

1)水位控制閥。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)減壓閥。將較高進口壓力減小到某一需要的出口壓力，并依靠介質(zhì)自身的能量，使出口壓力自動保持穩(wěn)定的閥門。

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)水用安全閥(泄壓/持壓閥)。當給水管路系統(tǒng)中的壓力超過設(shè)定壓力時，閥門自動開啟泄壓，保護管線安全。

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)止回閥。安裝在給水系統(tǒng)的水泵出口，防止介質(zhì)倒流，并消除水擊。

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)電動開關(guān)閥。以電磁閥作為先導閥，根據(jù)電信號，遙控開啟和關(guān)閉給水管路系統(tǒng)，可取代用來開啟和關(guān)閉的閘閥和蝶閥的大型電動裝置，并可實現(xiàn)遠程控制。

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流量控制閥。將過大的流量限制在一個預定值，并將上游的高壓減為所需要的下游低壓。

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壓差旁通平衡閥。用于空調(diào)系統(tǒng)供水管、回水管或集水器、分水器之間，控制供水管、回水管或集水器、分水器之間的壓差為設(shè)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緊急關(guān)閉閥。用于消防用水與生活用水并聯(lián)的供水系統(tǒng)中，自動調(diào)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膜片式快開排泥閥。安裝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隔膜式池底卸泥閥。安裝在沉淀池的底部，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.

直通型水擊預防閥如何選型

How to Select a Straight-through Water Hammer Prevention Valve

(1)型號的選擇 選擇GA5700直通型水擊預防閥的型號，主要根據(jù)用途去選擇，當確定了用途、介質(zhì)、溫度和工作壓力后，選擇所需要的型號。

(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)結(jié)構(gòu)型式的選擇 選擇GA5700直通型水擊預防閥的結(jié)構(gòu)型式，主要取決于管路系統(tǒng)中的水質(zhì)。當水質(zhì)比較差時，優(yōu)先選用直流式中的膜片式結(jié)構(gòu)，由于直流式的結(jié)構(gòu)特點，閥座在閥體內(nèi)腔呈傾斜狀態(tài)，水中的雜質(zhì)不易停留在密封面上，因此不受水質(zhì)的影響，始終能保證動作靈活。

(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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