The 220 Series uses a servo-operated design rather than the more conventional one and can deliver higher outlet pressure than spring-loaded models. The main diaphragm of model 220 is loaded with gas pressure instead of spring pressure. A small pilot regulator in the upper housing accurately controls the gas pressure. When the regulated outlet pressure of the servo regulator is changed by spring adjustment, the outlet pressure of the 220 main regulators will be changed proportionately. Applications include industrial furnaces and ovens. In addition, they are suitable for natural, manufactured, mixed gases, liquefied petroleum gases, and LP gas-air mixtures.
