Application
Control butterfly valve for use in process engineering and
industrial applications to meet high demands
Suitable for liquids, vapors and gases
Nominal size DN 100 to 400 ? 4” to 16”
Nominal pressure PN 10 to 40 ? ISO PN 20 and 50
ANSI Class 150 and 300
Temperatures ?10 to +400 °C ? 14 to 752 °F
Type 3331 Butterfly Valve with ? Type BR 31a Pneum. Rotary Piston Actuator (see T 9929 EN) Or as special version with ? Type 3278 Pneumatic Rotary Actuator (see T 8321 EN) Valve body made of ? Cast steel ? Stainless cast steel Butterfly disc type ? Swing-through or ? Angle-seated (low-noise) Additional features ? Butterfly valve can be clamped between DIN or ANSI flanges ? Centering eyes to simplify installation in the pipeline Attachment of control valve accessories such as pneumatic or electropneumatic positioners, electric or pneumatic limit switches or solenoid valves according to VDI/VDE 3845. Versions Standard version Type 3331 Butterfly Valve with swing-through or angle-seated (low-noise) disc for temperatures between ?10 and +220 °C (14 to 428 °F), spring-loaded packing – Type 3331/BR 31a (Fig. 1) ? Butterfly valve and single-acting Type SRP Pneumatic Rotary Piston Actuator Special version – Type 3331/3278 (Fig. 2) ? Butterfly valve and single-acting Type 3278 Pneumatic Rotary Diaphragm Actuator Further versions with – Graphite packing ? Medium temperature between ?10 and +400 °C (14 to 725 °F) – DN 50 and 80, angle-seated ? Without noise reduction, full-mold cast body of 1.4404 – Double packing – Adapter flange ? On request – Handwheel – Extension for cryogenic applications – Manual or electric actuator ? On request – Double-acting rotary actuator ? On request – Step-seated butterfly disc ? On request
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