The difference between electric valve and solenoid valve

Date:Feb 10, 2019

First of all, from a large scope, the solenoid valve is also an electric actuator. Both of them need to be energized to open the valve. However, the electric valve directly generates a lifting force after energizing, driving the valve stem and the solenoid valve. After being energized, the coil generates electromagnetic force, which drives the solenoid valve spool to open or close, and then inflates the cylinder to shut off the air, which drives the valve to open and close, that is, the solenoid valve must have a compressed air source, and must be used with the cylinder, and the electric valve No need, just connect it to the valve.

Secondly, the electric valve can generate more lifting force than the solenoid valve, and the corresponding opening of the valve is larger, but the electric valve can not withstand high temperature, 150 degrees or more, it is easy to burn the motor with the electric valve. Moreover, the sealing performance of the electric valve is also worse than that of the electromagnetic valve. When the valve stem is lifted, the movement distortion is also very easy, that is, the opening is excessive or the opening is insufficient, and the solenoid valves of these shortcomings can be operated normally, which can be regarded as an advantage.

Finally, electric valves are generally used in those cases where the sealing requirements are not high, the temperature is not high, and the opening accuracy is not high. The corresponding solenoid valve is basically used for precision opening. It is recommended that if there is a factory Use a solenoid valve as much as possible for the air supply.

Use method difference

First, the switch form:

The solenoid valve is driven by the coil and can only be turned on or off. The switching time is short. The drive of the electric valve is generally a motor, and the opening or closing action requires a certain amount of time to simulate, and can be adjusted.

Second, the nature of the work:

Solenoid valves generally have a small flow coefficient and a small difference in working pressure. For example, a general 25-caliber solenoid valve has a smaller flow coefficient than a 15-caliber electric ball valve. The solenoid valve is driven by an electromagnetic coil and is relatively easily damaged by voltage surges. Equivalent to the role of the switch, is the role of opening and closing. The electric valve is generally driven by a motor and is more resistant to voltage surges. The solenoid valve is fast open and fast closed. It is generally used in small flow and small pressure, and the electric switch is required in the place where the switching frequency is large. The opening of the electric valve can be controlled. The state has open, closed, half open and half closed, which can control the flow of the medium in the pipeline and the solenoid valve can not meet this requirement. The solenoid valve can be reset by general power failure, and the electric valve needs to be reset by such a function.

Third, the applicable process:

Solenoid valves are suitable for some special process requirements, such as leakage, special fluid media, etc., which are more expensive. Electric valves are generally used for adjustment and also have a switching quantity, such as: fan coil end.

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