What is the working principle of vacuum flapper valve?
The working principle of vacuum flapper valve is that the valve plate moves up and down through the valve stem to achieve sealing. The driving parts of the valve stem are manual, electric and pneumatic.
The vacuum flapper valve releases the back cap of the hand wheel and turns the hand wheel in a certain direction. The pneumatic transmission parts are powered by compressed dry air. The direction of the air path is changed by the electromagnetic directional valve, which pushes the cylinder piston to move up and down, and drives the valve rod to move up and down, so as to open and close the valve plate, so as to achieve the purpose of connecting or stopping the air flow.
Manual dual-purpose transmission components, composed of motor, worm gear, worm, equipped with travel switch. When the power is turned on, the motor rotates in a certain direction, and the valve rod is driven upward by worm gear and worm to make the valve plate rise. When the valve rises to a certain height, the travel switch will automatically cut off the power supply, and the movement of the valve rod will stop immediately, and vice versa.
The working principle of the vacuum flapper valve is simple, but when we operate the vacuum flapper valve, we should follow his principle.
High vacuum flapper valve of main performance indexes
The high vacuum flapper valve is used to connect or cut off the air flow in the vacuum pipeline. The suitable medium is pure air and non corrosive gas. Pneumatic high vacuum flapper valve is powered by compressed air. Through the cylinder execution, the electromagnetic directional valve changes the direction of the gas path and drives the valve rod to move up and down, so as to achieve the purpose of opening or closing the valve plate. The shaft seal structure of pneumatic high vacuum flapper valve can be divided into fluororubber seal and bellows seal, and S-type is tee with pre suction port. The pneumatic high vacuum flapper valve has normally open and normally closed functions, and can be equipped with magnetic switch signal control, explosion-proof solenoid valve and air source processing element device. The working medium of high vacuum flapper valve is air and non corrosive gas.
According to the shaft seal structure, high vacuum flapper valve can be divided into GD-J rubber shaft seal and GD-J (b) bellows shaft seal. According to the conduction form, GD-J is angle pass type and gd-s is tee type with pre suction port.
Main parts material: valve body, valve cover, valve stem: aluminum alloy, carbon steel or stainless steel
Seal: rubber, fluororubber, bellows (shaft seal).
Application range of high vacuum flapper valve:
1 × 10-6pa ～ 1.2 × 105Pa (bellows seal)
1 × 10-5pa ～ 1.2 × 105Pa (fluororubber seal)
Pressure difference on valve plate when opening:
≤ 1.2 × 105 PA in any direction
Leakage rate of valve body and seat of high vacuum flapper valve: ≤ 1.3 × 10-7 PA · L · S-1
Recommended number of cycles before first maintenance: 200000
Baking temperature of valve body: ≤ 150 ℃
-Manual drive: any – pneumatic drive: any
-Electromagnetic drive: any (bellows seal); sealing face to vacuum (fluororubber seal)
-Pneumatic drive: AC 220 V, 50 Hz, 6 W or DC 24 V, 3 W (special specifications can be customized)
-Electromagnetic drive: AC 220 V or 230 V, 50 Hz, starting power 800 W, holding power 8 W
Compressed air (pneumatic only)
Valve opening and closing time pneumatic drive: ≤ 1s
-Electromagnetic drive: on ≤ 0.1s;
Close ≤ 1s (fluororubber seal), close ≤ 0.5s (bellows seal)
Valve position indication
-Manual drive: with opening and closing position indication
-Pneumatic drive: with opening and closing position indication switch (magnetic switch)
-Electromagnetic drive: with open position indicator