Vacuum valve characteristics and selection basis
The vacuum valve is a component used in the vacuum system to regulate the air flow, cut off and close the pipeline. According to its working principle, it is mainly divided into a shut-off valve, a butterfly valve, an angle valve, a gate valve, a solenoid valve, a ball valve, a safety valve and a regulating valve. and many more. The vacuum valve has the following features: Pneumatic ball valve http:// . Com/qdqf/ Ready-to-eat Sweet Corn Kernels
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The working pressure is below atmospheric pressure and the pressure drop across the flap cannot exceed 1 kgf/cm2. The operating temperature of the media depends on the process in which the device is used. The temperature generally does not exceed the range of -70 to +150 °C.
The basic requirement for such a valve is to ensure a high degree of sealing of the joint and a compact structure and gasket material.
Vacuum valves can be divided into four groups according to the medium pressure:
1. Low vacuum valve: medium pressure p=760~1 mmHg;
Second, the medium vacuum valve: p = 1 × 10-3 mm Hg.
3. High vacuum valve: p=1×10-4 ~1×10-7 mmHg;
The basis for consideration when selecting a vacuum valve is as follows:
First, according to the working pressure, there are low vacuum valves, high vacuum valves and ultra high vacuum valves.
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. O-ring rubber seal for shaft seal Generally, the vacuum seal of the vacuum seal has a leak rate of 10-4Pa.L/S. 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.
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