There are several requirements to consider when selecting a vacuum valve.
The basis for consideration when selecting a vacuum valve is as follows:
First, the low vacuum valve, high vacuum and ultrahigh vacuum valve according to the valve operating pressure.
Second, according to the structural characteristics, there are butterfly valves , ball valves , diaphragm valves , flapper valves, flapper valves, angle valves, straight-through valves, three-way valves.
Third, according to the transmission principle, there are manual, pneumatic, electric, electromagnetic. Generally, the pneumatic is the process of the electromagnetic pilot and the cylinder performing the action, and the process of performing the action of the pilot valve cylinder can also be controlled by hand. Electric for both hands and electricity, when the power is off, you can manually operate.
Fourth, according to the material of stainless steel, carbon steel, aluminum alloy as the main material of the valve.
5. According to the material of the dynamic seal, the metal seal and the non-metal seal valve can also be divided. The O -ring rubber ring for shaft seal generally has a leakage rate of 10-4Pa.L/S for vacuum dynamic sealing . The vacuum is not high during the movement of the shaft. It can be used under the condition of high vacuum. The shaft seal is metal corrugated. The tube seal has a leak rate of 10-7Pa.L/S and is suitable for use under ultra-high vacuum conditions.
The following is a brief introduction to the use of the universal vacuum valve of the three-precision valve.
　　 The butterfly valve is in the form of straight-through, and the three driving modes of hand, gas and electricity are determined by the user. The opening angle of the manual butterfly valve is arbitrarily adjustable; the opening angle of the intelligent pneumatic and electric butterfly valves is also arbitrarily adjustable.
The flapper valve is used in applications where high vacuum requirements or high pipe sizes are required. Full-conductance, valve leakage rate of 10-7Pa.L / S , two-way sealing. The driving method of hand, gas and electric is determined by the user. Both pneumatic and electric have signal feedback devices.
　　 The diaphragm valve and the ball valve are straight-through and can be used in situations where positive pressure and vacuum coexist. The driving method of hand, gas and electric is determined by the user.
The flapper valve is used in corners and tees in the vacuum line. The driving method is hand, gas, electromagnetic, and electric, which are determined by the user. Among them, GDC-J electromagnetic high-pressure flapper valve is metal bellows seal, which has wide application range and can also be used as inflation valve; the installation position can be arbitrary , it can reverse the top one atmosphere , and has feedback signal output.
The electromagnetic vacuum belt inflation valve and the electromagnetic vacuum differential pressure valve are vacuum valves specially designed to prevent the mechanical vacuum pump from returning oil, are installed at the air inlet of the mechanical vacuum pump, and are turned on and off synchronously with the pump. Generally can not be used elsewhere, that is to say can not be used for deflation in vacuum systems. The advantage of using electromagnetic vacuum differential pressure valve is that the power consumption is small and energy is saved. The valve body of DN ≤ 50 is made of aluminum alloy, which is light in weight, small in volume and fast in valve plate closing speed.
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