Servo-hydraulics

The servo-hydraulic linear and torque amplifiers use advanced stepper motor technology for precise control of the spool within the valve enabling an accuracy measured in microns (µm) to be achieved.

Linear amplifiers - type: LVN,LVK & LVH
 
For linear applications requiring the highest accuracies three ranges are available dependant upon the flow requirements:
 
LVN (up to 80 litres/min at 160 bar);
 
LVK (up to 200 litres/min at 160 bar);
 
LVH (up to 320 litres/min at 300 bar).

Cylinders on all three ranges are available in diameters between 32-200mm, stroke lengths up to 1,200mm, stroke increments <0.008mm and accuracy's <0.03mm.

Torque amplifiers - type: SFM, SVN & SVK
 
Torque amplifiers are available with an output torque of up to 140Nm for the vane motors (SFM), 230Nm for the smaller piston motors (SVN) and 685Nm for the more powerful piston motors (SVK). A positional accuracy of <0.5° can be attained dependant upon the application.

Looking for spare seal kits? ... In order for us to provide you a price of the seal kit we need to know the TYPE NO. and the six digit FABRICATION NO., for example:

Type no.: LVNG4Z N2 M19/63-36-350-40 / 100
Fab. No.: 605 876

These stepping motors from Curtiss-Wright Antriebstechnic (formerly SIG Antriebstechnic) are used as the pilot motor on the servo-hydraulic linear amplifiers and torque amplifiers. The step motor accurately controls the movement of the spool inside the NC-valve attached to the hydraulic cylinder or motor. Most versions are coupled to the NC-valve via a flexible coupling (LVN, LVK, LVH, LVH & LVC linear amplifiers as well as the SVN, SVK & SFM torque amplifiers) however one motor (Type 247) which is used on the LVE range of linear amplifiers forms a hydraulic seal with it's flange.

Curtiss-Wright (SIG) 2-phase stepping motors

Curtiss-Wright (SIG) 3-phase stepping motors

Curtiss-Wright (SIG) 5-phase stepping motors

Curtiss-Wright (SIG) 2-phase stepping motors

Back to top

Curtiss-Wright (SIG) 3-phase stepping motors

Back to top

Curtiss-Wright (SIG) 5-phase stepping motors

Back to top