Water treatment systems include primary, secondary and tertiary treatment stages through which tap water or waste water is converted into drinking water. In the initial stage, very large particles such as plastic, paper, etc. are screened and removed with the help of bar screens and sand removal systems. In the primary stage, the total suspended solids are removed with the help of a clarifier. Biological and chemical oxygen demand are removed in the secondary stage by an aeration process. The third stage system constitutes a filter to remove the remaining total suspended solids. It also constitutes a reverse osmosis system to remove total dissolved solids and other ions. In treated tanks, chlorination is performed to disinfect and remove bacteria present in the water. A water treatment system consists of a different number of unit operations, such as clarifiers, filters, reverse osmosis systems, etc. Flow, pH, and pressure are indicators of whether these unit operations are functioning properly. When these parameters deviate from the standard values, signals from the flow meter, pH meter, pressure transmitter are sent to the SCADA direct control system, which sends an electrical signal or supply gas to the actuators of these automatic valves to open and close.

With the continuous development of the new energy industry, valves have played an increasingly important role in it. Valves are one of the most critical equipment in the energy system, and their performance has an important impact on the efficiency and safety of energy conversion. In the field of new energy, the application scope and requirements of valves are also different, and we will introduce them one by one below. In solar photovoltaic power generation systems, there are two common types of valves: check valves and regulating valves. Check valves are usually used to prevent backflow and ensure the stable operation of solar panels. The regulating valve is generally used to adjust the output power of the solar panel to ensure the stability of the system. For large solar power stations, due to the system requirements of high power, high pressure and high flow, the use of high-performance electric actuators and intelligent control systems can effectively improve the efficiency and safety of the system. In the field of new energy industry, wind power generation systems, biomass power generation systems, hydroelectric power generation systems, these valves work together through automatic control systems to maintain the stability and safety of the system. In short, the valve is one of the indispensable equipment in the new energy industry. Different types of new energy equipment require different valves, and the material and design of the valve also need to be adjusted according to the actual situation. Therefore, the selection of high-performance valves and intelligent control systems can greatly improve the efficiency and safety of new energy equipment.

Valve is an important pressure pipe element with large quantity and wide area in petrochemical equipment, which has the functions of cutting, regulating, diverting, preventing countercurrent, regulating pressure, diverting or overflow, pressure relief, etc. The valve is also the most complex component in the pipeline, which is generally assembled by multiple parts, with complex structure and high technical content. The application of valves is very wide, in all kinds of petrochemical and chemical equipment, pipeline material costs accounted for about 15% to 20% of the total investment of the project, and the investment cost of valves accounted for about 50% of the total cost of piping, of which the proportion of various types of valves is not the same, taking refining equipment as an example, various types of valves in the device accounted for the total proportion of valves are: Gate valve 80%, globe valve 8%, check valve 6%, these three valves are the most used valves in petrochemical production equipment, other valves account for 6%, and valve investment accounts for 5% to 8% of the device. Taking 2.5 million tons/year atmospheric and vacuum devices and 1.4 million tons/year catalytic cracking devices as examples, the proportion of valve specifications in the total number of valves is: DN≥400 3%, DN150~350 12%, DN50~100 25%, DN≤40 60%.

As the population continues to rise, global food production will need to increase everywhere. However, the effects of climate change continue to make it difficult to achieve optimal crop yields in some places, so best agricultural practices, including irrigation, need to be used. Agricultural irrigation can optimize water flow by using a variety of drive and control valves, thus ensuring that only the optimal amount of water is used and not wasted. Of course, we at COVNA can supply these pneumatic and electric valves for both small and large irrigation applications. In this article, we will learn how to select and apply COVNA actuators to regulate water flow in irrigation practices. Where can actuators be used in the agricultural irrigation industry? Both electric and pneumatic valves have a wide range of applications in the agricultural irrigation industry, but it takes some thought and consideration to find the best use for them. The biggest use is to control water flow through automated control loops that require humidity sensors to analyze the moisture level of the soil and thus open/close the water valve accordingly. In this case an on/off or flow control valve can be used. When using control valves, valves such as globe valves and Angle valves are usually preferred in agricultural irrigation, which have a tighter closure than other valves. COVNA actuators are suitable for applications with these valves as they meet requirements for torque, general wear resistance, etc., as these applications may require the actuator to be outdoors, etc. In addition, since the valve can be operated in manual mode in case of power failure, it has the flexibility to operate continuously without obstacles.