Quarter Swing Butterfly Valves

Edwards Quarter Swing Butterfly Valves

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.

Manual operation

High conductivity

Resists atmosphere in either direction

Compact and quick acting

Corrosion resistant construction

Technical Data

Conductance

Operation pressure range

Reliability MTTF (pneumatic valves)

Operating temperature range

Leak rate

Recommended pneumatic pressure

Units

l/s

  mbar  

cycles

°C  

mbar l/s

bar

QSB63

420

10-9 to 3000

>1.5x105

5 to 40

<10-9

2.8 to 6

QSB100

1250

10-9 to 3000

>1.5x105

5 to 40

<10-9

2.8 to 6

QSB160

2700

10-9 to 3000

>1.5x105

5 to 40

<10-9

2.8 to 6

Documentation

Spectroscopy magazine

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