Quarter Swing Butterfly Valves

QSB 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

  QSB63 QSB100 QSB160
  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
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