Solenoid valve is a kind of electric valve, is the use of magnetic field generated by the solenoid coil to pull the spool, thereby changing the valve body on and off, coil power, the spool on the pressure of the spring back.
Electric valve simply said is the use of electric actuator control valve, so as to achieve the opening and closing of the valve. It can be divided into two parts, the upper part of the electric actuator, the lower part of the valve.
Electric valve is divided into two kinds, one is the Angle stroke electric valve: by the Angle stroke of the electric actuator with Angle stroke of the valve, to achieve 90 degrees of the valve within the rotation control pipe fluid on and off; The other is the straight stroke electric valve: by the straight stroke electric actuator with straight stroke valve use, realize the valve plate up and down action control pipeline fluid break. Usually in a higher degree of automation equipment matching the use.
Electric valve is usually connected by electric actuator and valve, after installation and debugging become electric valve. The electric valve USES the electric energy as the power to connect the electric actuator to drive the valve and realize the switch and adjustment of the valve. So as to achieve the medium of the pipeline switch or regulation purposes.
Use and differentiation of electric and solenoid valves
Solenoid valve using electromagnetic principle, using the electromagnetic attraction generated by the electrified electromagnetic coil to guide the movement of valve core, control mode for the digital signal control DO.
The driving device of the electric valve is a reversible electric motor, which drives the valve core to control the valve through the rotation of the motor for a certain time. AI analog signal control can be used to adjust the flow of pipeline medium, and digital signal control can also be used in specific pipeline environment.
Application range difference between electric valve and electromagnetic valve:
Solenoid valve has excellent leakproof performance, fast opening and closing, small power, suitable for cutting off in some corrosive, toxic and other chemical materials pipeline use.
Electric valves are mostly used for the regulation of pipeline flow, normally installed in the air outlet of the air supply and refrigeration pipeline, and also can be used in the liquid pipeline, widely used in the canning pipeline of beverage production and sewage treatment pipeline.
Use of electric and solenoid valves:
Solenoid valve: for liquid and gas pipeline switch control, is two DO control. Generally used for small pipe control
Electric valve: for liquid, gas and wind system pipe medium flow analog regulation, is AI control. In the control of large valve and wind system can also use electric valve to do two switch control.
Solenoid valve: can only be used as a switch quantity, is DO control, can only be used for small pipe control, common in DN50 and below the pipeline, up is very few.
Electric valve: can have AI feedback signal, can be controlled by DO or AO, more commonly seen in large pipelines and wind valves.
Solenoid valve through the coil drive, can only open or close, switch action time is short.
Electric valve drive is generally used in the motor, open or close action to complete a certain amount of time to simulate, can be adjusted.
Solenoid valve general flow coefficient is very small, and the working pressure difference is very small. For example, the general 25 - diameter solenoid valve flow coefficient than 15 - diameter electric ball valve is much smaller. Solenoid valve drive is through the electromagnetic coil, relatively easy to be damaged by voltage shock. Equivalent to the role of the switch, is to switch on and off 2.
Electric valve drive is generally used in the motor, relatively resistant to voltage shocks. Solenoid valve is fast open and close, generally used in small flow and small pressure, the need to switch the frequency of large local electric valve on the contrary. The opening of the electric valve can be controlled, the state is open, close, half open and half closed, can control the flow of pipeline medium and solenoid valve can not meet the requirements.
Solenoid valve general power can be reset, electric valve to such a function needs to add reset device.
Solenoid valve for some special process requirements, such as leakage, special fluid medium, the price is more expensive.
The electric valve is generally used for regulation, also has the amount of switch, such as: fan coil end.
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