Pneumatic actuators

Technical data on our current standard actuators is available here. We will be glad to send you information on custom actuators on request.

Operating instructions


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,
pulling by compressed air

Fu: spring at the bottom

pulling by spring force,
pushing by compressed air

Stroke 12 / 16 / 22 mm
Spindle diameter 10 mm
Housing material aluminium (GD-AlSi9Cu3)
Diaphragm NBR
Weight 2.1 kg

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,
pulling by compressed air

Fu: springs at the bottom

pulling by spring force,
pushing by compressed air

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

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,
pulling by compressed air

Fu: springs at the bottom

pulling by spring force,
pushing by compressed air

Stroke 40 mm
Spindle diameter 10 / 16 mm
Housing material aluminium (GD-AlSi9Cu3)
Diaphragm NBR (silicone also possible)
Weight from 6.1 kg

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,
pulling by compressed air

Fu: springs at the bottom

pulling by spring force,
pushing by compressed air

Stroke 44 mm
Spindle diameter 22 mm
Housing material aluminium (GD-AlSi9Cu3)
Diaphragm NBR
Weight from 27.7 kg

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,
pulling by compressed air

Fu: springs at the bottom

pulling by spring force,
pushing by compressed air

Stroke 66 mm
Spindle diameter 22 mm
Housing material aluminium (GD-AlSi9Cu3)
Diaphragm NBR
Weight from 34.2 kg

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,
pulling by compressed air

Fu: springs at the bottom

pulling by spring force,
pushing by compressed air

Stroke 44 / 66 mm
Spindle diameter 22 mm
Housing material aluminium (GD-AlSi9Cu3)
Diaphragm NBR
Weight from 55.5 kg

Digital I/P positioner

baelz 87

The positioner is used to set the position of a valve according to a control signal.

It compares the corrective signal from the control system to the current position of the valve and issues a pneumatic signal.