Electric capacity controls for mRoy metering pumps consist of a family of controls to adjust the flow rate of the pumps in
accordance with manual or electronic input signals.
This control is achieved by use of two distinct, separate devices: the actuator and the controller. The actuator mounts
on the pump body and contains a reversible motor to drive the pump capacity adjustment. The controller, which can be
mounted remotely, contains electronic circuitry to accept an input signal and commands the actuator to drive to a
Two actuators are described in this manual, one for the mRoy A and one for the larger mRoy B. Five types of controllers
are described, any one of which will control either actuator.
Figure 1. mRoy A Simplex and Duplex
Pumps with Electric Capacity Control