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Pressure acting on vanes #1 and #4 causes clockwise rotation and pressure balances the rotor.
Vanes #2 and #5 are inactive in the position shown.
Vanes #3 and #6 have been rotated to the position shown
to clear steps on the housing.
Why does this design deliver such accurate, repeatable positioning?
Case drain leakage is so low that your servo valves can compensate for it easily. Leakage is limited to the amount of fluid that can pass between the motor shaft and journal bearings where our dimensional tolerances are extremely small.
In servo systems, cross port leakage is effectively zero since servo valves apply equal pressure to both ports when in the “null” position.
Why are these motors so “stiff” when holding position?
They have a rigid one-piece rotor and shaft. Without any internal keys, splines or gears, there can be no internal backlash.
Why do they start so smoothly?
Our Axial Vane design yields low speed and torque ripples. Breakaway pressure is typically less than 10 psi.
Why do they operate so smoothly at low speeds?
Much of this is due to their mechanical characteristics.
- Rotor is 360° pressure balanced
- Diametrical clearance between vanes and housing is fixed. There is no metal-to-metal contact.
- Only 7 moving parts
- All bearings are pressure lubricated.
Why such long working life expectancies?
- There is no metal-on-metal contact between motor vanes and housing.
- All other rotating parts operate on a definite oil film produced by pressure lubrication.
What are the basic valving options?
Manifold ports are provided for direct valve or cross-over relief valve mounting.
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VON RUDEN MANUFACTURING, INC
1008 FIRST ST N.E. | P.O. BOX 699 | BUFFALO, MN 55313
Phone: (763) 682-3122 | Fax: (763) 682-3954