Solenoid valve is the electromagnetic coil generated after the magnetic force to attract the spring to overcome the pressure of the spring drive spool action on a solenoid coil, simple structure, cheap, can only achieve the switch; electric valve is driven by the motor stem, driven spool action, electric The valve is divided (shut off the valve) and the regulating valve. Shut-off valve is a two-position work that is fully open and fully closed, the control valve is installed in the above electric valve positioner, through the closed-loop adjustment to make the valve dynamic stability in a position.

Use of electric and solenoid valves:

Solenoid valve: switch control for liquid and gas lines, two DO controls. Generally used for small pipe control.

Electric valve: for the liquid, gas and wind system pipe flow of the flow of the analog adjustment is AI control. In the large valve and wind system control can also be used to do two electric valve switch control.

Solenoid valve: can only be used as a switch, DO control, can only be used for small pipe control, common in the DN50 and below the pipeline, up very little.

Electric valve: can have AI feedback signal, can be controlled by DO or AO, compared with large pipes and wind valves and so on.

1. Switch form:

Solenoid valve driven by the coil, can only open or close, the switch action time is short.

Electric valve drive is generally used to motor, open or close the action to complete the need for a certain amount of time analog, you can do regulation.

2. Nature of work:

Solenoid valve common flow coefficient is very small, and the working pressure difference is very small. For example, the general diameter of the solenoid valve 25 diameter than the 15 diameter electric ball valve much smaller. Solenoid valve drive is through the electromagnetic coil, more easily damaged by voltage shocks. Equivalent to the role of the switch is to open and off the two roles.

Electric valve drive is generally used motor, more resistant to voltage shock. Solenoid valve is quick opening and fast closing, generally used in small flow and small pressure, requiring a large switching frequency of the local electric valve instead. Electric valve valve opening can be controlled, the state has open, closed, half open half, you can control the flow of media in the pipeline and the solenoid valve does not meet this requirement.

Solenoid valve power can be reset, the electric valve to be such a function need to reset device.

3. Applicable technology:

Solenoid valve for some special process requirements, such as leakage, fluid medium special, the price is more expensive.

Electric valve is generally used to adjust, there are switch volume, such as: fan coil end.