Other Keystone Equipment

Keystone 320 & 322 Butterfly Valve

The Keystone 320 (Wafer) and Keystone 322 (Lug) are economical resilient seated Butterfly Valves. The dimensions of the Keystone 320 and 322 are according to the ISO standards.

The Keystone 320 and 322 are designed for use in applications which require shut-off control. The Keystone 320 and 322 have non-replaceable seats, and can be used in combination with manual or gear operators.


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Bubble-tight shut-off at full rating in both directions
One piece, specially profiled, wafer thin disc stem
Extended body neck allows free access to Actuator where pipe insulation has been fitted
The seat and disc are the only two parts in contact with the medium
Face to face dimensions according ISO 3202 Part 3, K1 (ISO 5752 series 20) and DIN EN 558-1, series 20
The F320 wafer version has four flange locating holes for end of line service under certain conditions
Standard actuation:
-Handle (F414) on 50-200 mm Valves
-Gear operators (F455) on 250-300 mm
The Keystone F322 lugged version is suitable for bi-directional end of line service
Suitable for pneumatic, electric and hydraulic actuation.
Size range: 320 (wafer style) DN 50-300,
322 (lugged style) DN 50-300
Pressure: 16 bar (in line and end of line)
Temperature: -29°C to 120°C (EPDM seat),
-15°C to 100°C (NBR seat)