Control valves are used to regulate or control the flow of fluids, including gas, oil, water, steam, and more. In the controlling field, a control valve is the final control loop component. You may wonder what the uses and functions of different control valves are. In this article, we will introduce these answers to you.
What is the Control Valve?
The control valve is composed of a valve body, actuator, positioner, body assembly, and trim parts. You may know that the control valve family includes hydraulic control valves, pneumatic control valves, water valves, steam valves, and chemical process valves. And for the control valve, it can control the fluid flow ranging from maximum to minimum load. This action is to maintain the flow rate at the set value, ensuring optimal fluid flow control to achieve your requirements.
How Does a Control Valve Work?
The control valve is like the hand of the entire system. It is just for controlling the whole process. The proper operation of the system depends on the controller, sensors, transmitters, and other components. Sensors and transmitters act like eyes, collecting process variables for the controller. After comparing them with the desired set values, the controller, which has brain-like functions, sends correction signals to the control valve to adjust the valve opening and achieve the desired value, thereby ensuring the quality of the final product.
What are the Functions of Different Control Valves?
Globe Type Control Valve
The globe type control valve is the most common type we use in our daily lives. It consists of a ball valve body and a valve core that can move up and down. This type of control valve uses the linear movement of the valve core to control the flow rate to achieve high-precision flow control. Therefore, it is often used in process flows that require a throttling system, such as the oil and gas industry.
Butterfly Type Control Valve
A butterfly-type control valve has a flat disc that rotates within the valve body to control the fluid flow. Butterfly valves have the same basic functions as other control valves, and with higher safety features and better performance, so they can replace other control valves in most applications. They have excellent sealing properties and can withstand high water pressures. Moreover, when you choose to use butterfly valves, they can also reduce maintenance requirements, improve the accuracy of flow control, and reduce the risk of leaking disasters, etc. Therefore, using butterfly-type control valves is more cost-effective for large amounts of requirements for you. They are often used in water treatment plants.
V-Port or Segment Ball Valve
The V-port or segment ball valve, similar to a traditional ball valve, is the most common type of ball control valve. It features a V-shaped notch in the ball. The V-notch ball is specially designed. It can make flow capacity to the maximum, improve shutoff integrity, and provide smooth, high-capacity flow control for you. If you use it properly, then it can extend seal life. A V-type ball valve is specially designed for corrosive slurries or those containing solids or fibers. Therefore, you can often see this valve being used in the papermaking industry, chemical plants, sewage treatment plants, and other places with such treatment needs.
Eccentric Plug Control Valve
The eccentric plug control valve is used with an innovative technology. It combines the simplicity and reliability of globe valves with the compactness and high capacity of rotary valves. Eccentric plug control valves are designed for you to control corrosive, coking, and other fluids that are difficult to handle. They provide the controlling function that can save fluid flow or switch on/off the valves. All these benefits combine to make them suitable for use in the mining, petroleum refining, power generation, and other industries.
What Can Control Valves Be Used For?
Oil and Gas Industry
The oil and gas industry uses control valves to achieve maximum capacity and operational efficiency. Within these industries, control valves can help you control flow, maintain pressure, regulate temperature, and convert liquids to gases and finally to slurries throughout the entire machine system. Ultimately, control valves ensure the appropriate amount of fluid is delivered at the right time, improving overall safety and quality assurance based on your requirements.
Chemical Processing Industry
Control valves can be widely used in the chemical industry, controlling your liquid level, temperature, pressure, and flow by closing or opening valves. These valves must withstand severe environmental conditions such as temperature fluctuations, corrosion, and high pressure. In chemical processing, control valves can regulate nitrogen levels and prevent leakage back into the system.
Power Plant Industry
Control valves are essential to equipment operated in power plants runs safely and effectively. They are capable of controlling the flow of fluid in a number of processes, including steam generation, cooling water service, and fuel supply. For the power plant, control valves can ensure everything runs efficiently and also prevent safety risks. Control valves in the power plants industry may experience severe operating conditions such as high temperatures, high pressures, and corrosive environments.
Water Treatment Industry
Control valves are the most common valve design used in industry to regulate and manage hot water, cold water, ground water, potable water, brackish water, and wastewater. Their main functions are to act as check valves to check and control flow. They also play an important role in maintaining the safety of water treatment systems by shutting off water flow in emergencies.
Conclusion
This article is a simple guide for beginners. We introduce many types of control valves and their functions for you. You also know more about what industries can use control valves. If you are interested in continuing to explore the secret of control valves, you can always contact Target Hydraulics for free.
