Quarter Swing Butterfly Valves
The QSB quarter swing valves are compact, quick acting, high conductance isolation valves. The QSB valves have a polished, stainless steel, ISO flanged body with fluoroelastomer ‘O’ ring sealed valve plate and shaft. The valve plate ‘O’ ring groove is vented to help maintain a stable high vacuum. The valve shaft ‘O’ rings and bearings are lubricated with Fomblin® grease to prevent gas bursts from behind the shaft seals.
This valve is supplied with a co-seal.
Conductance
Operation pressure range
Reliability MTTF (pneumatic valves)
Operating temperature range
Leak rate
Recommended pneumatic pressure
Units
l/s
mbar
cycles
°C
mbar l/s
bar
QSB63
420
10⁻⁹ to 3000
>1.5 x10⁵
5 to 40
<10-9
2.8 to 6
QSB100
1250
10⁻⁹ to 3000
>1.5 x10⁵
5 to 40
<10-9
2.8 to 6
QSB160
2700
10⁻⁹ to 3000
>1.5 x10⁵
5 to 40
<10-9
2.8 to 6
Spectroscopy magazine
