Lochinvar & A.O. Smith 100108941 3/4X3/4 Inch 4 Inch Wc Full 0.7 Inch Wc Step

The Lochinvar & A.O. Smith 100108941 is a 3/4 inch x 3/4 inch safety relief valve designed for hydronic heating systems and boilers. By automatically opening and discharging excess pressure over a certain limit (a 4-inch water column, or WC), it safeguards the system from pressure surges. Known by another name, the whole step, this preset pressure is normally factory set but is movable within a given range. After the pressure drops below a second preset threshold (0.7 inch WC), referred to as the step-down pressure, the valve then automatically closes. This safety valve ensures the safe and dependable functioning of the system by releasing excess pressure and protecting boilers and other equipment from potential harm caused by pressure build-ups.