Pneumatic actuators
Pneumatic actuators are powered by compressed air. Depending on actuator type, the drive spindle moves inwards or outwards, whereby the connected valve plug opens or closes the valve in the corresponding amount to control the flow. If a pneumatic actuator is combined with a positioner, the result is an electro-pneumatic actuator that provides the speed of a pneumatic actuator plus the precision of an electric actuator.
Pneumatic actuator baelz 373-P11
Compact pneumatic linear actuator for small control valves and ejectors. The reduced dimensions are predestined for compact systems where space is at a premium. Due to its simple design, this pneumatic actuator can be used for OPG operations (valve closed without compressed air) or for OPO operations (valve open without compressed air). This enables the OPG/OPO function to be selected during installation without dismantling the actuator.
| For control valves/ejectors | up to DN 50 |
| Fo: spring at the top | pushing by spring force, |
| Fu: spring at the bottom | pulling by spring force, |
| Stroke | 12 / 16 / 22 mm |
| Spindle diameter | 10 mm |
| Housing material | aluminium (GD-AlSi9Cu3) |
| Diaphragm | NBR |
| Weight | 2.1 kg |
Pneumatic actuator baelz 373-P21
Versatile pneumatic linear actuator for control valves and ejectors with a max. stroke of 22 mm. Depending on the type, the actuator force ranges from 1020 N to 7590 N.
| For control valves/ejectors | up to DN 125 |
| Fo: springs at the top | pushing by spring force, |
| Fu: springs at the bottom | pulling by spring force, |
| Stroke | 8 / 12 / 16 / 22 mm |
| Spindle diameter | 10 / 16 mm |
| Housing material | aluminium (GD-AlSi9Cu3) |
| Diaphragm | NBR (silicone also possible) |
| Weight | from 5.3 kg |
Pneumatic actuator baelz 373-P22
Pneumatic linear actuator for control valves and ejectors with a stroke of 40 mm. Depending on the type, the actuator force ranges from 1846 N to 3692 N.
| For control valves/ejectors | up to DN 125 |
| Fo: springs at the top | pushing by spring force, |
| Fu: springs at the bottom | pulling by spring force, |
| Stroke | 40 mm |
| Spindle diameter | 10 / 16 mm |
| Housing material | aluminium (GD-AlSi9Cu3) |
| Diaphragm | NBR (silicone also possible) |
| Weight | from 6.3 kg |
Pneumatic actuator baelz 373-P31
Pneumatic linear actuator for control valves and ejectors with a stroke of 44 mm. Depending on the type, the actuator force ranges from 2480 N to 10560 N.
| For control valves/ejectors | DN 150 |
| Fo: springs at the top | pushing by spring force, |
| Fu: springs at the bottom | pulling by spring force, |
| Stroke | 44 mm |
| Spindle diameter | 22 mm |
| Housing material | aluminium (GD-AlSi9Cu3) |
| Diaphragm | NBR |
| Weight | from 27.7 kg |
Pneumatic actuator baelz 373-P32
Pneumatic linear actuator for control valves and ejectors with a stroke of 66 mm. Depending on the type, the actuator force ranges from 2201 N to 8115 N.
| For control valves/ejectors | from DN 200 |
| Fo: springs at the top | pushing by spring force, |
| Fu: springs at the bottom | pulling by spring force, |
| Stroke | 66 mm |
| Spindle diameter | 22 mm |
| Housing material | aluminium (GD-AlSi9Cu3) |
| Diaphragm | NBR |
| Weight | from 34.2 kg |
Pneumatic actuator baelz 373-P41
Pneumatic linear actuator for control valves and ejectors with a stroke of 44 mm or 66 mm. Depending on the type, the actuator force ranges from 3765 N to 31920 N.
| For control valves/ejectors | from DN 150 |
| Fo: springs at the top | pushing by spring force, |
| Fu: springs at the bottom | pulling by spring force, |
| Stroke | 44 / 66 mm |
| Spindle diameter | 22 mm |
| Housing material | aluminium (GD-AlSi9Cu3) |
| Diaphragm | NBR |
| Weight | from 55.5 kg |
