Series 3331 Type 3331/31a Pneumatic Control Butterfly Valve

Series 3331 

Type 3331/31a Pneumatic Control Butterfly Valve

Application 

Butterfly valves for increased industrial requirements in process engineering and in industrial applications Suitable for liquids, vapors and gases Nominal size DN 100 to 400 · NPS 4 to 16 

Nominal pressure PN 10 to 40 · ISO PN 20 and 50 Class 150 and 300 

Medium temperature –10 to +400 °C · 14 to 752 °F

Type 3331 Butterfly Valve with 

. Type 31a Pneumatic Piston Rotary Actuator Alternatively, as special version with 

. Type 3278 Pneumatic Rotary Actuator

Standard version 

Type 3331 Butterfly Valve with swing-through or angle-seated (low-noise) disk for medium temperatures from –10 to +220 °C (14 to 428 °F), spring-loaded PTFE packing 

– Type 3331/31a. Butterfly valve and single-acting Type SRP Pneumatic Rotary Piston Actuator 

Special version 

– Type 3331/3278. Butterfly valve and single-acting Type 3278 Pneumatic Rotary Diaphragm Actuator

Datasheet:

Series 3331 Type 3331/31a Pneumatic Control Butterfly Valve