Automatic Control Valves-Their Types and Function

Automatic Control Valves

A valve is a mechanical device used to control the flow of fluids. There are two basic types of valves, an on-off valve that stops or allows the flow of fluid and a control valve that regulates the flow of fluids. Both types of valves are used in industrial and domestic applications. Valves open and close in response to variations in pressure, level, flow, or temperature in an industrial environment.

Valves function by obstructing a passageway in piping by actuation of a ball, disc, or a plug. The actuating may be accomplished manually or may be automatic.

Manual valves are manually operated valves. Manual actuation entails physical contact with a handwheel, lever, or gearbox operator. On the other hand, automated actuation uses air pressure, hydraulic pressure, or electricity. The working of these valves also depends on the flow of the fluid being controlled. Some actuators remotely indicate the position of the valve opening.

Pneumatically operated valves are widely used for industrial applications. Hydraulically operated valves close automatically based on the variations in pressure and flow. They do not require any external source of power to function.

Types of Automatically Operated Valves: 

Pressure Reducing Valves: 

Their function is to reduce the pressure of the inlet of flow to a lower level. These valves may be used for water hammer protection. These valves are also used as an added precaution where some other valve is functioning. Pressure-reducing valves are also used as bypass valves to operate pumps that may stop due to power failure.

Flow Control Valves: 

These valves maintain the specific flow for different flowmeters. The flow of liquids in hydraulically powered systems is critical and flow control valves help regulate the flow. FCVs may be ball valves, globe valves, needle valves, or gate valves.

Back-pressure Sustaining Valves: 

These valves may be installed in pipelines to sustain minimum preset upstream pressure when there are fluctuations in flow or variations in the downstream pressure. They may be installed as circulation valves. The function of a circulation valve is to relieve the excessive line pressure when it crosses the preset level.

Altitude Valves:

These valves are used for controlling the level of fluid in a tank. The valve remains open when the tank is not full and closes when the tank reaches the maximum level. These valves do not require any external source of power for functioning.

Relief Valves:

Relief valves are used to limit pressure in one or more positions in a hydraulic circuit. These valves limit the pressure in an entire system by directing the pressurized flow to a reservoir.

These are automatically actuated valves that find extensive industrial applications. However, while choosing the best valve for your application, you will need to consider the specific function for which it is required and the environment where it will be used. This will determine the type of valve the material of construction of the valve.

Since there are so many types of valves available, selecting the right one can be overwhelming. The EG Valves Manufacturing Co., Ltd team will guide you on the selection of the suitable industrial valve for your application.

EG Valves Manufacturing Co., Ltd is a professional valve manufacturing company with over 20 years of experience in manufacturing and marketing a wide variety of industrial valves. We supply high-quality industrial valves with the required documentation to global clients. Our team of professionals has expertise in the design and application aspects of valves.

Location: United States

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