Actuators for industrial processes

Actuators 

Pneumatic, electric and electrohydraulic actuators for control valves and butterfly valves

Diaphragm actuators up to 2800 cm² 

Electric actuators up to 12.5 kN 

Electrohydraulic actuator up to 7.7 kN 

Hand-operated actuator

Actuators convert the control signal supplied by automation equipment (controller, control station, process control system) into a linear or rotary motion used to position the final control element (e.g. valve plug) in direct proportion to the control signal received. For control valves, this converted motion is a linear motion (upward or downward). For butterfly valves, ball valves and rotary plug valves, this is a rotary motion up to 70° opening angle for throttling applications. For on/off service, this is a rotary motion up to 90°. The actuator together with the valve constitute the entire control valve assembly, commonly referred to as the control valve. To meet plant requirements, the actuators can be equipped with a wide range of transfer elements, such as positioners, converters, solenoid valves, position transmitters and limit switches

Pneumatic actuators 

The pneumatic actuators are diaphragm actuators with rolling diaphragm and internal compression springs. 

Benefits of pneumatic actuators: 

. Designed for signal pressures up to 6 bar (90 psi) 

. Low overall height • Powerful thrust and high response speed 

. Minimum friction • Various bench ranges 

. No special tools required to change the bench range or to reverse the operating direction of the actuator

Type 3271 Pneumatic Actuator 

. For rated travels of 7.5 to 160 mm and diaphragm areas of 120, 175, 240, 350, 355, 700, 750, 1000, 1400 and 2800 cm² 

. Tandem actuator with effective area of 2 x 2800 cm² 

. Optional version fitted with handwheel on the diaphragm case for actuators with 120 to 700 cm² diaphragm areas (Fig. 1) 

. 1400 to 2800 cm² diaphragm areas with side-mounted handwhee

Type 3277 Pneumatic Actuator 

. Suitable for integral positioner attachment 

. Diaphragm areas of 120, 175, 240, 350, 355, 700 or 750 cm² 

. Rated travels from 7.5 to 30 mm 

. Optionally with handwhee

Type 3204-1 and Type 3204-7 Pneumatic Actuator with Rotary Lever  

. Pneumatic diaphragm actuators for final control elements with rotary closure members, particularly for butterfly valves and louvers (shutters) 

. 350 or 700 cm² diaphragm areas • Optionally with manual override 

. Type 3204-7 Actuator suitable for integral positioner attachment

Type 3278 Pneumatic Rotary Actuator 

. Single-acting rotary actuator with spring-return mechanism used for butterfly valves and other final control elements with rotary closure members 

. 70° or 90° nominal opening angle 

. 160 or 320 cm² diaphragm areas 

. Optionally with manual override

Pfeiffer Type 31a Pneumatic Rotary Actuator 

. Single-acting or double-acting piston actuator for final control elements with rotary closure members 

. 90° opening angle • Optionally with additional manual override 

. Suitable for throttling or on/off service

Electric and electrohydraulic actuators 

Type 3274-11 to -23 Electrohydraulic Actuator  

. Thrust up to 7.7 kN and 15 or 30 mm rated travel 

. Transit times of 60 s and higher for three-step control or with positioners for input signals from 0/4 to 20 mA or 0/2 to 10 V 

. Optionally with electric or mechanical override 

. Version with fail-safe action available

Type SAM Electric Actuator 

. Linear actuator with reversible motor with thrusts of 2 to 25 kN for rated travels from 15 to 120 mm 

. Transit times of 30 s and higher for three-step control or with positioners for input signals from 0/4 to 20 mA or 0/2 to 10 V 

. With mechanical override, two torque-dependent and three travel-dependent limit contacts

Type 3374 Electric Actuator  

. Electric actuator for plant engineering and HVAC 

. Thrust up to 2.5 kN 

. Version: 

- With or without fail-safe action 

– For three-step control 

– With digital positioner

Type 3375 Electric Actuator 

. Electric actuator for plant engineering and HVAC 

. Thrust up to 12.5 kN 

. Version: 

– For three-step control 

– With digital positioner 

– Version with fail-safe action (in preparation)

Hand-operated actuator 

Type 3273 Hand-operated Actuator 

. For attachment to valves used as hand-operated control valves 

. Particularly suitable for attachment to Series 240, 250 and 260 Valves 

. 15 to 30 mm rated travel, Nominal thrusts up to 32 kN

Datasheet: Pneumatic, electric and electrohydraulic actuators for control valves and butterfly valves