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Electric valve is simply said to control the valve with electric actuator, so as to realize the valve open and close. It can be divided into two parts, the upper half is divided into electric actuator, the lower half is divided into valve. Also called an air-conditioning valve.
Electric valve is a high-end product in the automatic control valve. It can not only realize the switch function, but also the regulating electric valve can also realize the valve position adjustment function. The electric actuator stroke can be divided into: 90 angle stroke and straight stroke two kinds, special requirements can also meet the 180,270,360 full stroke. The electric actuator with Angle stroke matches the valve with Angle stroke to realize the fluid opening and break of the rotary control pipe within 90; the straight stroke electric actuator works with the straight stroke valve to realize the upper and lower action of the valve plate.
One is the angular stroke electric valve: the electric actuator with the Angle stroke valve to realize the internal spin control pipe at 90 degrees; the other is the straight stroke electric valve: the electric actuator with the straight stroke valve to realize the valve board. It is usually used on highly automated equipment.
Features: the structure is very simple, long service life; suitable for almost all media, viscosity maximum 600 m m2/s (Li); high temperature resistance, chemical corrosion resistance; low explosion-proof cost, only with small 72 explosion-proof pilot valve;
Forms: electric valve is generally divided into often closed and often open two kinds, often closed type refers to the valve is closed when power off, often open type is open in the state of power off; in addition, the wiring is also divided into three lines and two lines, large diameter is mostly three lines, small caliber will have two lines and three lines system.
1. Switch form: the drive of the electric valve is generally with a motor, open or close the action to complete the need of a certain amount of time simulation, can be adjusted.
2. Working nature: The electric valve is generally driven by a motor, which is more resistant to voltage impact. Solenoid valve is fast open and fast close, generally used in small flow and small pressure, required switching frequency is large place; electric valve otherwise. The opening degree of the electric valve valve can be controlled, the state is open, closed, half open and half close, can control the flow of the medium in the pipe and the solenoid valve can not meet this requirement.
3. Applicable process: the electric valve is generally used for adjustment, there are also switching volume, such as: the end of the fan coil.
Wiring mode: the three-line electric valve has three F / R / N lines, F represents forward action (or open action) control line, R represents reverse action (or close action) control line, and N represents ground wire.
Selection of control valve: the control valves commonly used in engineering are mainly: solenoid valve and electric valve. But they have defects in use, such as solenoid valve is easy to be blocked by foreign bodies, water resistance, must be long-term special maintenance, and the electric valve has no water resistance, but need the necessary control circuit, so, water vapor erosion affects the service life is also the main problem.
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