Maxitrol R8110-412 4-12" Violet Spring RV81 & 210D

The Maxitrol R8110-412 Violet Spring RV81 and 210D is a measuring part of gas pressure regulators to establish a certain control range within the HVAC systems. It gives a spring force that determines the regulator reaction to differentials of inlet and outlet pressure between 4 and 12 inches of water column, to maintain a constant flow of gas to burners. In the uniformity of fuel supply, correct combustion, and predictable thermal provision in gas-fired heating systems through the maintenance of specified operating pressures.