Vickers Vane Pump description: Single-acting vane pump is divided into one-way variable and two-way variable according to the change of eccentric direction. Bi-directional variable can change the inlet and outlet ports during operation, so that the movement of hydraulic actuator is reversed. to. According to the different ways of changing the eccentricity, it can be divided into manual adjustment and automatic adjustment. According to the different working characteristics, the automatic adjustment can be divided into constant flow type, constant pressure type and voltage limiting type.