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电动执行器在水处理行业中的应用

电动执行器在水中应用的问题
Problems with the application of valve electric devices in water treatment industry

电动执行器在水处理中的主要重点在于流量的控制,如:一改常规节流阀使用孔板或纯机械的减小流域面积的原理,利用相关导阀,大限度地减小能量在节流过程中的损失;控制灵敏度高,安全可靠,调试简便,延长使用寿命。
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.
一般来说,改变电动执行器电动阀门的阀芯与阀座间的流通截面积,便可控制流量。但实际上还有许多因素影响,例如在调节面积改变的同时还发生阀前后压差的变化,而这又将引起流量的变化。因此电动执行器在水处理中的发展方向的难点就在于如何有效的优化电动执行器的开度从而控制流量,实现优化生产和降低成本的目的,怎样能够更好的锁定流经阀门的水量,而不是针对阻力的平衡,解决系统的动态失调问题。
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.

电动执行器在水处理应用中的重、难点
Important and difficult points in the application of valve electric device in water treatment尽管电动执行器得到广泛的使用,调节系统中的其它单元大概都没有像它那样少的维护工作量。在许多系统中,电动执行器经受的工作条件如温度、压力、腐蚀和污染都要比其它部件更为严重,然而,当它控制工艺流体的流动时,它必须令人满意地运行及少的维修量。电动执行器既有静态特性,又有动态特性,因而它影响整个控制回路成败。静态特性或增益项是阀的流量特性,它取决于阀门的尺寸、阀芯和阀座的组合结构、执行机构的类型、阀门定位器、阀前和阀后的压力以及流体的性质。电动执行器通常分为直通单座式调节阀和直通双座式调节阀两种,后者具有流通能力大、不平衡办小和操作稳定的特点,所以通常特别适用于大流量、高压降和泄漏少的场合。

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.

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