1. Performance indicators

（1） Valve body leakage rate: <1*10-8pa.l/s (rubber ring square flange valve body leakage rate: <1*10-7pa.l/s)

（2）Application range: 6*10E-8Pa-1*10E5Pa (rubber ring seal 6*10E-7Pa-1*10E5Pa)

（3）Baking temperature: valve body <200℃ (in valve open state), hand wheel and valve body connection <80℃

（4） Number of turns required to open or close the valve: DN63-DN150 about 9 turns, DN200-DN250 about 11 turns

（5） Installation position: any

（6） Installation direction: It is recommended that the valve plate seal face the pump or high vacuum side

（7） Pressure difference on both sides of the valve plate opening: <2000Pa

2. Installation dimensions

(1) Manual blade

(2) Manual hook nail