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
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| 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 |
