The solenoid valve is a solenoid valve that generates a magnetic force to attract and overcome the pressure of the spring to drive the valve core to move after the solenoid coil is energized. It is only a solenoid coil, which has a simple structure and a low price, and can only be switched. The valve is divided into (shut-off valve) and regulating valve.
The shut-off valve is a two-position type of work, that is, fully open and fully closed. The control valve is equipped with an
electric valve positioner on it, and the valve is dynamically stabilized in one position through closed-loop adjustment.
Application of electric valve and solenoid valve:
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.
1. Switch 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 drive of the electric valve is generally used for the motor. It takes a certain amount of time to complete the opening or closing action, and it 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 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 valve 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.
3. Applicable technology:
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.
