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Different applications of solenoid valve and electric valve of Shanghai Nuoyou Valve Industry
Difference between electric valve and solenoid valve:
The solenoid valve is a magnetic coil that generates magnetic force after the solenoid coil is energized to overcome the pressure of the spring to drive the valve core. The solenoid coil has a simple structure and a low price, and can only be opened and closed;
The electric valve is driven by an electric motor to drive the valve core, and the electric valve is divided into a shut-off valve and a regulating valve. The shut-off valve is a two-position operation, that is, fully open and fully closed. The regulating valve is equipped with an electric valve positioner on it, and the valve is dynamically stabilized in one position through closed-loop adjustment.
Comparison of use of electric valve and solenoid valve:
Solenoid valve: used for on-off control of liquid and gas pipelines, it is two-position DO control. Generally used for the control of small pipelines.
Electric valve: It is used for analog quantity adjustment of pipeline medium flow of liquid, gas and wind system. It is AI control. 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 switching value. It is DO control and can only be used for small pipeline control. It is common in pipelines of DN50 and below.
Electric valve: It can have AI feedback signal and can be controlled by DO or AO. It is found in large pipes and dampers.
1. Switch form:
The solenoid valve is driven by the coil and can only be opened or closed. The switching time is short.
The drive of electric valve is generally driven by a motor. It takes a certain amount of time to complete the opening or closing action and can be adjusted.
2. Nature of work:
The solenoid valve generally has a small flow coefficient and a small working pressure difference. For example, the flow coefficient of a 25-port solenoid valve is much smaller than a 15-port electric ball valve. The solenoid valve is driven by the electromagnetic coil, which is relatively easy to be damaged by voltage shock. Equivalent to the role of a switch, that is, on and off
Electric valve is generally driven by a motor, which is more resistant to voltage shock. Solenoid valves are quick-opening and quick-closing. They are generally used in small flows and pressures, where electric switching is required where the switching frequency is high. The opening degree of the electric valve can be controlled, and the states are open, closed, half-open and half-closed. The flow rate of the medium in the pipeline can be controlled, but the solenoid valve cannot meet this requirement.
The solenoid valve can be reset when the power is off. The electric valve needs a reset device for this 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 more expensive.
The electric valve is generally used for adjustment, and there are also switching values.
Editor of Shanghai Nuoyou Valve Industry Co., Ltd.