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.

Features and Benefits

  • Manual operation
  • High conductivity
  • Resists atmosphere in either direction
  • Compact and quick acting
  • Corrosion resistant construction
Technical data  
Valve plate material AISI 304 stainless steel
Operating pressure range 10-9 - 3000 mbar
  8 x 10-10 - 2250 Torr
Max pressure differential 1000 mbar / 750 Torr
Operating temp range 5 - 40 °C
Max baking temp 200 °C (without actuator)
Leak rate < 10-9 mbar ls-1
  8 x 10-10 Torr ls-1
Pneumatic valves only:  
Reliability (MTTF) >1.5 x 105 cycles
Pneumatic connectors 1/8 inch BSP, for 6mm OD tube
Number of connectors  
QSB63, QSB100, QSB160 2
Reed switch rating  
Max voltage 30V
Max current 500mA
Max Power 6W
Reed switch connectors 3m flying leads
Microswitch rating 5A at 48V
Microswitch connectors  
QSB63, QSB100, QSB160 Solder tags
Flange Size ISO63 up to ISO250
Conductance * 420 ls-1
QSB63 420 ls-1
QSB100 1250 ls-1
QSB160 2700 ls-1
Recommended pneumatic pressure~ (bar)  
QSB63, QSB100, QSB160 2.8 to 4.2

* Conductance of equivalent tube length
~ Pneumatic operation