Vickers Variable Displacement Piston Motor

Although pumps and motors are almost the same in design, they operate in reverse of each other.  Motors are rotated by the fluid and pumps are forcing it thru the unit as it rotates. And variable displacement units are operate by the design of the yoke angle.

Now piston motors are a positive displacement and give off different torques and speeds. The torque is made possible by the pressure drop across the motor. Now speed on the other hand is a function of the input fluid volume and motor displacement.

The relief valve setting is what limits the maximum torque.

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