R & RS Series regulators have a double diaphragm balanced valve design, allowing it to maintain steady outlet pressure control with widely varying inlet pressures. R & RS series regulators are used with both main burner and pilot load applications. Applications include infrared heaters and pilot lines on large industrial heaters and boilers. They may also be used in residential applications as appliance regulators. In addition, they are suitable for natural, manufactured, mixed gases, liquefied petroleum gases, LP gas-air mixtures, and gases of DIN EN 437 gas families 1, 2, and 3.