Abstract: A metering applicator apparatus has an accurately controlled fluid or compound discharge which discharge is the difference between the discharge of a constant displacement metering pump and the discharge of a pressure regulating device. The constant displacement metering pump discharges a constant predetermined volume and pressure of fluid. The pressure regulating device downstream of the constant displacement metering pump has a carefully controlled braking arrangement for controlling the volume and pressure of fluid maintained in the system with the balance being motored or bypassed through the pressure regulating device and back to a supply tank. The difference between the fluid from the constant displacement metering pump and the fluid motored or bypassed back to the tank is the volume of fluid at a constant pressure available at the applicator gun or nozzle.