Description: serves as a reference variable for a slave controller; Name: output variable of the controller
Description: output variable of the controlling element, which is deducted from the control difference variable and is also the input variable of the actuator; Name: controller output variable
Description: average speed given by the stroke length multiplied with the number of complete pumping cycles of the piston, plunger or piston attached to the diaphragm per minute (stroke per minute or pump crank speed); Name: piston velocity