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        • 電動執行機構
        • 閘閥、蝶閥
        首頁 > 新聞中心 > 電動執行器在水處理行業中的應用



        Problems with the application of valve electric devices in water treatment industry

        The main focus of the valve electric device in water treatment is flow control, such as: changing the principle of conventional throttle valve using orifice plate or pure machine to reduce the drainage area, using the relevant pilot valve to minimize the energy loss during the throttling process; high control sensitivity, safe and reliable, easy to debug, and can extend service life.
        In general, the flow rate can be controlled by changing the flow cross-sectional area between the valve core and valve seat of the valve electric device. However, there are actually many influencing factors. For example, changes in the adjustable area and in the pressure difference in front and behind the valve at the same time, which will cause the change of flow volume. Therefore, the difficulty in developing  the valve electric device in water treatment lies in how to effectively optimize the opening of the valve electric device so as to control the flow, achieve the purpose of optimizing production and reducing costs, and how to better lock the amount of water flowing through the valve. It is not to focus on the balance of resistance and solve the dynamic imbalance problem of the system.

        Important and difficult points in the application of valve electric device in water treatment盡管電動執行器得到廣泛的使用,調節系統中的其它單元大概都沒有像它那樣少的維護工作量。在許多系統中,電動執行器經受的工作條件如溫度、壓力、腐蝕和污染都要比其它部件更為嚴重,然而,當它控制工藝流體的流動時,它必須令人滿意地運行及少的維修量。電動執行器既有靜態特性,又有動態特性,因而它影響整個控制回路成敗。靜態特性或增益項是閥的流量特性,它取決于閥門的尺寸、閥芯和閥座的組合結構、執行機構的類型、閥門定位器、閥前和閥后的壓力以及流體的性質。電動執行器通常分為直通單座式調節閥和直通雙座式調節閥兩種,后者具有流通能力大、不平衡辦小和操作穩定的特點,所以通常特別適用于大流量、高壓降和泄漏少的場合。

        Although the valve electric device is widely used, the other units in the regulation system probably do not have as much maintenance as it does. In many systems, valve electric devices are subject to more severe operating conditions such as temperature, pressure, corrosion and contamination than other components. However, when it controls the flow of process fluid, it must operate satisfactorily and with minimum maintenance volume. The valve electric device has both static and dynamic characteristics, so it affects the success or failure of the entire control loop. The static characteristic or gain term is the flow characteristic of the valve and it depends on the size of the valve, the composite structure of the valve plug and valve seat, the type of actuator, the positioner of the valve, the pressure in front and behind the valve, and the nature of the fluid. Valve electric devices are usually divided into straight single-seat type control valves and straight-through two-seat type control valves. The latter one has the characteristics of large flow capacity, small unbalance, and stable operation, so it is generally suitable for the occasions of large flow, high pressure drop and less leakage.