Vacuums

Quarter Swing Butterfly Valves

Quarter Swing Butterfly Valves
  • Manual operation
  • High conductivity
  • Resists atmosphere in either direction
  • Compact and quick acting
  • Corrosion resistant construction

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.

Technical Data







Units
QSB63
QSB100
QSB160
Conductance
l/s 420 1250 2700
Operation pressure range
mbar 10-9 to 3000
10-9 to 3000
10-9 to 3000
Reliability MTTF (pneumatic valves)
cycles >1.5x105
>1.5x105
>1.5x105
Operating temperature range
°C 5 to 40
5 to 40
5 to 40
Leak rate
mbar l/s <10-9
<10-9
<10-9
Recommended pneumatic pressure
bar 2.8 to 6
2.8 to 6
2.8 to 6