The 220 series uses a servo-operated design rather than a spring-loaded design and can deliver higher outlet pressures than the conventional spring-loaded models. The main diaphragm of the model 220 is loaded with gas pressure instead of a spring. A small pilot regulator located in the upper housing precisely controls this gas pressure. When the regulated outlet pressure of the servo regulator is changed by spring adjustment, the outlet pressure of the main 220 regulator will be changed proportionately.
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