vacuum butterfly valve of application scope and characteristics

Vacuum butterfly valve refers to the butterfly valve used to open and close the valve by 90 ° rotation of the butterfly plate fixed on the rotating shaft, which is used to connect or cut off the air flow of the vacuum pumping system and the pumping pipeline. Compared with other vacuum valves of the same caliber, the vacuum butterfly valve has the advantages of simple structure, large conduction capacity, short valve body structure length and fast opening and closing speed. The vacuum butterfly valve has three forms: manual, pneumatic and electromagnetic. Take the vacuum butterfly valve as an example. The vacuum butterfly valve is applicable to the small-diameter (nominal size dn32-300) vacuum pumping system and the pumping pipeline for connecting or cutting off the air flow. The pneumatic vacuum butterfly valve and the electric vacuum butterfly valve are applicable to the small-diameter (nominal size dn32-5000) vacuum pumping system and the pumping pipeline for connecting or cutting off the air flow. This paper analyzes the application scope and characteristics of vacuum butterfly valve in detail.

1、Vacuum butterfly valve of application scope

According to the classification of manual, pneumatic and electric vacuum butterfly valves, we analyze their application range

1. Manual high vacuum butterfly valve (high vacuum butterfly valve) has GI type and gi-a type. The outline of GI type vacuum butterfly valve is shown in Figure 1. Air leakage rate is less than 1 × 10-6Pa·L/s。

Manual high vacuum butterfly valve has GI type and gi-a type. Air leakage rate is less than 1 × 10-6Pa·L/s。

2. Pneumatic high vacuum butterfly valve is suitable for connecting or cutting off air flow in high vacuum system.

The valve is powered by compressed air, changes the direction of the air path through the electromagnetic reversing valve, and executes the cylinder pushing to rotate the valve plate fixed on the rotating shaft by 90 ° to realize the opening and closing of the valve.

The applicable working medium is air and non corrosive gas.

Main technical performance

Applicable range (PA)

105～1.3×10-5

Valve leakage rate (pa.l/s) ≤ 1.3×10-6

3. The manual and electric GID electric vacuum butterfly valve (electric high vacuum butterfly valve) adopts a 1 / 4 rotating electric device, with stable operation and low noise (compared with the pneumatic valve). It can be installed in any direction. The valve opening and closing positions are equipped with electric signal devices and signal sources for displaying the opening and closing status of the valve plate and automatic control.

The sealing material of the valve plate of GID series electric vacuum valve is nitrile vacuum rubber, the service medium and ambient temperature are – 25 ~ 80 ℃, and the air leakage rate is less than 1 × 10-6pa · L / s, suitable for 10-4Pa high vacuum equipment and air extraction pipeline.

2、Vacuum butterfly valve of characteristics

1. Compared with ordinary valves, vacuum butterfly valves can withstand the pressure from the front and reduce the degree of valve damage. ​

2. The vacuum butterfly valve can prevent the valve stem from moving up and down when the valve stem moves.

3. The vacuum butterfly valve can change the direction of the air path through electromagnetic reversing, and then control the air cylinder to drive the opening and closing movement of the butterfly valve.

4. The vacuum butterfly valve is designed to connect or cut off the medium air flow in the vacuum pipeline channel.

5. The vacuum butterfly valve can be used to regulate and control the medium brought by non corrosive gas and pure air.

6. The vacuum butterfly valve can select its matching feedback signal device and positioner of the electric valve to realize the remote control and adjustment of the vacuum. ​