Tips For Selecting The Valve For Desalination

With the continuous improvement of the level of global industrialization, freshwater resources are increasingly scarce, and the lack of water resources has led to slow global industrial development. Desalination has become an important option for coastal cities to solve such problems. Valves are widely used in seawater desalination plants. As important control components in various processes, their selection and application are particularly important. The right valve can help seawater treatment plants build fluid pipelines to regulate water flow and increase production capacity.

In the process of seawater desalination, it is necessary to pay attention to the corrosion of chloride to equipment. Seawater temperature affects the corrosion rate, the higher the temperature, the faster the corrosion. Solid contaminants can damage the protective film of the material and cause erosion corrosion. Various chemical contaminants also increase the probability of corrosion. The addition of ingredients can also cause corrosion. Therefore, in seawater desalination, media with different degrees of corrosion will be encountered. We need to decide which style of valve to choose according to the processing technology.

Because seawater is highly corrosive, and seawater desalination requires uninterrupted and stable operation, corrosion resistance has become the main consideration. Valves used in seawater desalination mainly include nickel aluminum bronze, stainless steel, carbon steel, ductile iron, dual-phase steel, UPVC, CPVC and PVDF. Commonly used in seawater desalination are butterfly valves, ball valves, gate valves, globe valves, check valves and diaphragm valves.

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Butterfly Valves

Butterfly valves are mainly used in the process of separating salt and water in seawater. The advantages of butterfly valves include convenient and rapid opening and closing, torque saving, small fluid resistance, and many styles, which can meet the needs of various processing processes. The body material, valve plate material and seal material of the butterfly valve can be replaced according to the requirements of the processing process. Such as replacing with duplex steel, nickel aluminum bronze and other materials that can withstand higher corrosion.

Ball Valves

Ball valves are mainly used for exhaust and dosing pipelines. The advantages of ball valves include good sealing performance, pressure resistance, corrosion resistance, and zero leakage. Due to the process of seawater desalination, there will be low-pressure pipelines and high-pressure pipelines. The ball valve can meet this demand. The ball valve has good pressure resistance and can withstand pressures up to Class 2500.

Gate Valves

A gate valve is a shut-off valve commonly used to circulate or block flow. The applicable pressure range and temperature range are relatively wide, and it will not be restricted by the flow direction, and the sealing performance is good.

Globe Valves

A globe valve is a valve commonly used to regulate, circulate and cut off flow. The globe valve has small friction on the sealing surface during the opening and closing process, is durable, easy to maintain, and is suitable for a wide range of pressures.

Check Valves

A check valve is a valve used to prevent backflow of media. Check valve can be divided into swing check valve, lift check valve, disc check valve and so on. It can prevent the reverse rotation of the pump and the motor and the leakage of the container medium.

The most important thing in choosing a valve for desalination is to choose the appropriate valve material and pressure bearing capacity. At the same time, routine maintenance and regular replacement of wearing parts and erodible parts will help reduce the unit consumption of some seawater desalination and unnecessary downtime. If you have any needs for valves, welcome to consult us. We will do our best to provide you with the right valve solution. sales@covnaactuator.com