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 trapped ‘O’ ring.

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
Maximum pressure differential 1000 mbar / 750 Torr
Operating temperature range 5 - 40 °C
Maximum baking temperature 200 °C (without actuator)
Leak rate < 10-9 mbar l s-1
  8 x 10-10 Torr l s-1
Flange Size ISO250
Conductance * 13000 l s-1
Operating Torque 19.5 Nm

* Conductance of equivalent tube length