The 220 series, utilizing a servo-operated design rather than the more conventional spring-loaded design, delivers higher outlet pressure than the spring loaded models. The main diaphragm on the Maxitrol 220 is loaded with gas pressure rather than with a spring. This gas pressure is precisely controlled by a small pilot regulator in the upper housing. When the regulated outlet pressure of the pilot regulator is changed, by spring adjustment, the outlet pressure of the main regulator will change proportionately.
Outlet pressure adjustments are readily made by first removing the hood of the Maxitrol 220. Then remove the cap atop the pilot regulator, which exposes the adjusting screw, and adjust to desired pressure. Three positions can be tapped and plugged for making inlet or outlet pressure readings. The fourth position is used to supply inlet pressure to the pilot regulator. Remote sensing is also available. 220 series industrial regulators are intended for use with all fuel gases. The regulator will perform most accurately when mounted in an upright postion in a horizontal pipe run. Gas flow must be oriented to arrow on regulator. When selecting for pipe size, make sure regulator is not more than one size larger or smaller than manifold pipe size. Single vent, equipped with model 12A06 vent limiting orifice, is located in upper housing. Ambient temperature limits are -40°F to 200°F. Maximum emergency exposure pressure is 25 psi. At this pressure the regulator will suffer no internal damage but it may not provide accurate regulation. CAPACITIES: 50,000 CFH EMERGENCY EXPOSURE: 25 psi INLET PRESSURE: 10 psi OUTLET PRESSURE: 1 psi to 5 psi
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