Structure and working principle of vacuum ball valve
1. Principle and application scope of vacuum ball valve
The working principle of vacuum ball valve is similar to that of vacuum butterfly valve. The valve is opened and closed by 90 ° rotation of the ball fixed on the rotating shaft. The opening and closing speed of vacuum ball valve is faster than that of vacuum butterfly valve, and the volume and leakage rate are larger than that of vacuum butterfly valve.
Because the valve body and valve rod in the structure are made of stainless steel, and the sealing materials such as valve seat and packing are made of polytetrafluoroethylene, they are suitable for air, water, steam, acid, alkali, etc. Medium temperature range: - 25~120 ℃, applicable to working pressure of 1 × 10-3～1.6 × 106Pa vacuum system and pressure system connect or cut off the medium flow with acid and alkaline gas and liquid.
2. Form and performance parameters of vacuum ball valve
The vacuum ball valve has three forms: manual, electric and pneumatic.
A. The vacuum ball valve series produced in China include manual (GU type), pneumatic (GUQ type) and electric (GUD type).
B. There are two types of vacuum pressure ball valves produced in China: pneumatic (GQQ type) and electric (GQD type). The technical performance parameters of the two vacuum pressure ball valves are: the leakage rate is less than or equal to 1.3 × 10-4Pa·L/s； Operating pressure range: 10-4~1.6MPa; The working temperature is - 30~150 ℃; The material of valve body and ball is 316L; The seal material is reinforced polytetrafluoroethylene and fluororubber; The pneumatic (or electric) actuator with 1/4 rotation is adopted, which works stably and has electrical signal output for valve opening and closing.
