Resideo V8043E1145 Valve 318973-401 and UBZ series units (specifically

and UBZ series units (specifically 75k BTU models) when operating between 2

it eliminates the need for field modifications or generic "universal" workarounds that compromise system efficiency

Failure to close typically results from debris or scale trapped in the pilot port or a damaged internal needle seat

reducing hunt and maintaining stable valve positioning under varying differential pressures

When diagnosing a cracked heat exchanger or assessing soot accumulation

Resideo V8043E1145 Valve 318973-401 and UBZ series units (specificallyThe Resideo V8043E1145 Valve is a professional grade 3 4 inch NPT motorized zone valve engineered for high demand hydronic heating systems. Specifically designed for closed loop applications, this 2 way normally closed valve provides precise on off control of hot water flow to individual zones. Featuring a forged brass body, a durable stainless steel stem, and a rubber ball plug, the assembly is built to withstand a maximum static pressure of 125 psi