Actuators

niwatec GmbH is specialised in the development of actuators and controls.

Our product range comprises:

Scotch Yoke Actuators from 200 Nm to 600,000 Nm
Rack and Pinion Actuators from 10 Nm to 12,000 Nm
Linear Actuators up to 5,000 kN

Supplementary to our actuators, various control systems are available

Pneumatic Controls

Natural Gas Controls
Gas over Oil Controls
Electro-Hydraulic Controls
Hydraulic Controls
Special Controls (e.g. solar engineering)

Upon development and advancement of the aforementioned actuator and control systems, particular attention is turned to both quality and user-friendliness of our products. We are always pleased to develop customised solutions.

niwatec‘s actuator systems are employed in the following fields of application

Operating pressure (control input pressure)

Pneumatic actuators up to 12 bar
Gas-operated actuators up to 100 bar (higher pressure ranges are available on request)
Actuators with gas over oil control up to 100 bar (higher pressure ranges are available on request)
Hydraulic actuators up to 250 bar

Ambient temperature

-20 °C to +80 °C as standard design
-60 °C to +60 °C as low-temperature design
Other temperature ranges are available on request

Rack & Pinion Actuator

Rack and pinion from 10 Nm to 12.000 Nm

niwatec rack and pinion actuators are available in the following designs:

Swivel mounted actuators for actuating valves and fittings with a control angle of 90°, 120°, 180° and 240°
Swivel mounted actuators for control tasks
Double- and single-acting actuators (with the same dimensions)

End-position adjustment ± 5° as a standard feature. Furthermore, niwatec rack and pinion actuators include a specific, durable slide-bearing system for all manoeuvrable parts, ensuring a high resistance against wear and tear.

Due to its innovative modular design, the control unit allows integrating a large variety of control functions.

Further benefits of niwatec rack and pinion actuators are:

All components are corrosion resistant
Compatible to all world-wide available ball valve adaptations
End-position signalisation can be carried out by means of various limit-switch units positioned directly on top of the actuator
All actuator versions can be complemented with gear boxes for manual operatio
Integration in existing customer automation processes is possible

Scotch Yoke Actuator

Scotch Yoke Actuators (NWS) from 200 Nm to 600,000 Nm

niwatec Scotch yoke actuators are based on the Scotch yoke mechanism and allow

actuating valves and fittings with a control angle of 90°
end-position adjustment ± 5° as a standard feature

Owing to an innovative modular design, the following combinations of functions are feasible:

double-acting actuators, equipped with two separate, independently working cylinders
single-acting actuators (spring open or spring close)

Because of the development of a unique rail mechanism and of specifically coated guideways, niwatec GmbH has been able to optimise the actuator efficiency.

Further benefits of the niwatec Scotch yoke actuators:

welded casing particularly suitable for low temperature applications
compatible to all commercially obtainable ball valve adaptations
end-position signalisation by means of various limit-switch boxes mounted on top of the actuator
modular design of the control unit allows integrating a large variety of control functions
(e.g. linebreak protection or over pressure/low pressure protection)
all actuator models can be complemented with emergency-stop solutions for manual operation
integration in already existing customer automation processes possible

Linear Actuator

Linear actuators upto 5.500.000 Nm

niwatec‘s NWLA linear actuators are already established in gas storages, power stations, refineries, in the petrochemistry, and in chemical plants and allow:

high pulling load
low regulating times

Our innovative modular construction system offers the following functional combinations:

double acting actuators
single acting actuators (spring opens or spring closes)

Further characteristics of niwatec‘s linear actuators are

corrosion resistant cylinders
consistently good surface condition with minor coarseness of the cylinder surface
compatible with all available gate valve adaptions
signalisation of end position by means of various limit switch boxes mounted directly on top of the actuator
modular construction of the control allows integration of various control functions, as e.g. regulation combined with ESD shutdown
all actuators can be complemented with emergency manual override via hand wheel or hydraulic hand pump
integration in already existing automatisation processes is realisable without difficulty