The Differences between Electric Valve and Solenoid Valve

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Both the electric valve and solenoid valve are important executive components in industrial pipe control, which are widely used in various industries, but what’s the difference between the solenoid valve and electric valve? In the following article, we will show you a basic analysis between the solenoid valve and electric valve.

Introduction of the Electric Valve

Electric valves are controlled by electric actuators, so as to realize valve opening and closing. It can be divided into two parts, the upper part is the electric actuator and the lower part is the valve. The Electric valve is a high – end product in the automatic control valve. It can not only realize the switch function, the adjustable electric valve can also realize the valve position adjustment function. Usually, we divide it into three types:

The electric valve fitted with an electric angle travel actuator: The electric actuator rotates the valve plate angle to control and regulate the on and off of the valve and the pipeline flow. The output shaft rotation of the electric actuator is less than a circle, that is, less than 360 degrees, which is usually 90 degrees to realize the valve opening and closing process. This kind of electric valve is mainly butterfly valve, ball valve, plug valve and so on.

The electric valve fitted with the multi-turn electric actuator (rotation angle >360 degrees): Generally, the output shaft of the multi-turn electric actuator rotates more than one circle, that is, more than 360 degrees. If we want to realize the valve opening and closing process, we need several such circles. This kind of electric valve is mainly gate valve, globe valve and so on

The electric valve fitted with the straight stroke electric actuator (linear motion): The movement of the output shaft of the electric actuator is linear, not rotating, and the opening and closing control are realized by lifting valve disc. This kind of electric valve is mainly regulating valve, single seat regulating valve, double seat regulating valve and so on.

Introduction of the Solenoid Valve

The solenoid valve is composed of the solenoid coil (solenoid), valve core and valve body. When the solenoid coil is energized or power-off, the valve core is driven to move the fluid through the valve body or be cut off. General speaking, the solenoid valve can be divided into three types:

Two-way solenoid valve: The valve has an inlet and an outlet connection to the line and it has normally open type (when energized, solenoid valve closes and the fluid is cut off) and normally closed type (when energized, the solenoid valve opens and the fluid passes through the valve), two control methods.

Three-way solenoid valve: There are three ports connected with the pipeline and it can be used in normally open type, normally closed type and general type, three control modes.

Four-way solenoid valve: This kind of valve is usually used to operate double acting cylinder. It has four or five pipeline connecting ports, one pressure port, two cylinder ports and one or two exhaust ports.

If the solenoid valve classified by function, we can divide it into direct-current solenoid valve, high-pressure solenoid valve, explosion-proof solenoid valve and so on.

Differences between the Electric Valve and Solenoid Valve

The general flow coefficient and the working pressure difference of the solenoid valve are small. For example, the 25-caliber solenoid valve has a much smaller flow coefficient than the 15-caliber electric ball valve. The solenoid valve is driven by the electromagnetic coil, which is easily damaged by voltage impact. It is equivalent to the function of the switch. However, the electric valves are usually driven by motors, which is relatively resistant to voltage impact. And the opening and closing of the electric valve can be controlled. The state of it can be divided into open, closed, half-open and half-closed. It can control the flow of the medium in the pipeline, but the solenoid valve can’t meet this requirement.

Applicable Process

Solenoid valves can meet some special technical requirements. The price is more expensive. Electric valves are generally used for regulating, and also for switching, such as in fan coil terminal.

Applications of Electric Valves and Solenoid Valves

The solenoid valve is usually used as a switch for liquid and gas pipelines. It is controlled by two-bit DO and generally used for the small pipe. The electric valve is used for analog quantity control of medium flow in liquid, gas and wind system. It is controlled by AI. In the large valves and wind system, it can also be used as two position switch.

KAIDI, as a major solenoid supplier for Rexroth and other valves, has mature technology and rich experience. If you are interested in our products, please feel free to contact us.

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