The solenoid valve is a solenoid valve that generates magnetic attraction after the solenoid coil is energized to overcome the pressure of the spring to drive the valve core to move. Just an solenoid coil has a simple structure and low price, and can only realize switching;

The electric valve drives the valve stem through the motor to drive the valve core to move. The electric valve is divided into (shut-off valve) and regulating valve. The shut-off valve is a two-position work, that is, fully open and fully closed. The regulating valve is equipped with an electric valve positioner, and the valve is dynamically stabilized in one position through closed-loop adjustment.

Application comparison of electric valve and solenoid valve

Solenoid valve: used for on-off control of liquid and gas pipelines, it is controlled by two-position DO. Generally used for the control of small pipelines.

Electric valve: It is used for the analog quantity adjustment of the medium flow of liquid, gas and wind system pipelines, and it is controlled by AI. In the control of large valves and wind systems, electric valves can also be used for two-position switch control.

Solenoid valve: It can only be used as a switch value, it is DO control, it can only be used for small pipeline control, and it is common in DN50 and below pipelines.

Electric valve: It can have AI feedback signal and can be controlled by DO or AO. It is more common in large pipelines and air valves.

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1. Switch form:

The solenoid valve is driven by a coil and can only be opened or closed, and the action time is short when switching.

The electric valve is generally driven by a motor, and it takes a certain amount of time to simulate the opening or closing action, which can be adjusted.

2. Nature of work:

Solenoid valves generally have a small flow coefficient and a small working pressure difference. For example, the flow coefficient of a general 25-caliber solenoid valve is much smaller than that of a 15-caliber electric ball valve. The drive of the solenoid valve is through the electromagnetic coil, which is relatively easy to be damaged by voltage shock. It is equivalent to the function of a switch, that is, on and off.

Electric valves are generally driven by motors, which are more resistant to voltage shocks. Solenoid valves open and close quickly, and are generally used in places with small flow and low pressure, where high switching frequency is required, and electric valves are the opposite. The opening of the electric valve can be controlled, and the state is open, closed, half-open and half-closed, which can control the flow of the medium in the pipeline, but the solenoid valve cannot meet this requirement.

Solenoid valves can generally be reset when power is off, and electric valves need to be equipped with a reset device for such a function.

3. Applicable process:

Solenoid valves are suitable for some special process requirements, such as leakage, special fluid medium, etc., and the price is relatively expensive.

Electric valves are generally used for regulation, and there are also switches, such as: the end of the fan coil unit.