Solenoid valve is a type of electric valve; it uses the magnetic field generated by the electromagnetic coil to pull the valve core, thereby changing the on-off of the valve body, the coil is de-energized, and the valve core is retracted by the pressure of the spring.

     The electric valve simply uses the electric actuator to control the valve, so as to realize the opening and closing of the valve. It can be divided into upper and lower parts, the upper part is the electric actuator, and the lower part is the valve.

      There are two types of electric valves, one is the angular stroke electric valve: the angular stroke electric actuator is used in conjunction with the angular stroke valve to realize the internal rotation of the valve within 90 degrees to control the on-off of the pipeline fluid;

      The other is a straight-stroke electric valve: a straight-stroke electric actuator is used in conjunction with a straight-stroke valve to realize the up and down action of the valve plate to control the on-off of the pipeline fluid. It is usually used in conjunction with equipment with a higher degree of automation.

      Electric valves are usually connected by electric actuators and valves, and become electric valves after installation and debugging. The electric valve uses electric energy as power to connect the electric actuator to drive the valve to realize the opening and closing and adjustment of the valve. So as to achieve the purpose of switching or adjusting the pipeline medium.

Uses and Differences

      The solenoid valve uses the electromagnetic principle, and uses the electromagnetic attraction generated by the electrified solenoid coil to guide the movement of the valve core. The control mode is DO digital signal control.

      The driving device of the electric valve is a reversible electric motor, which drives the spool to control the valve through the rotation of the motor for a certain period of time. Using AI analog signal control, the flow of the pipeline medium can be adjusted, and digital can also be used in a specific pipeline environment. signal control.

The difference between the scope of application of electric valve and solenoid valve

     The solenoid valve has excellent anti-leakage performance, rapid opening and closing, and low power. It is suitable for use as a cut-off in some chemical pipelines such as corrosion and toxicity.

      Electric valves are mostly used for the regulation of pipeline flow. They are normally installed at the outlet of air supply and refrigeration pipelines. They can also be used in liquid pipelines. They are widely used in canned pipelines and sewage treatment pipelines for beverage production.

Use of Electric Valves and Solenoid Valves

     Solenoid valve: used for switch control of liquid and gas pipelines, it is a two-position DO control. Generally used for the control of small pipelines

    Electric valve: It is used for analog regulation of medium flow in liquid, gas and wind system pipelines, and 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 switch value, it is DO control, and it can only be used for small pipeline control. It is common in pipelines of DN50 and below, and there are very few upwards.

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

ON/OFF form

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

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

Nature of the work

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

     The electric valve is generally driven by a motor, which is relatively resistant to voltage shocks. The solenoid valve is quick-opening and quick-closing, and is generally used in small flow and small pressure, where the switching frequency is required to be large. 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.

     The solenoid valve can generally be reset after power off, and the electric valve needs to add a reset device for such a function.

Applicable process

     The solenoid valve is 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 adjustment, and there are also switching quantities, such as: the end of the fan coil unit.