The present invention is directed to a method of reducing cooling capacity in refrigeration systems. The present invention provides a refrigeration system comprising a main, an economizing, and a bypass circuits. The main circuit comprises a compressor, a condenser unit, an expansion device, an evaporator unit, connecting piping and appropriate refrigeration control. The compressor includes an economizer port located in the compression region, and a variable flow valve associated with the economizer port. A body of the valve is a part of a body of the housing and a seat of the valve in a closed position is shaped to be contiguous with internal portion of the housing. The economizer circuit includes a first solenoid valve, an additional expansion device and an economizing heat exchanger. The bypass circuit has a second solenoid valve. A control system activates the valves based on a capacity demand.