Honeywell Flange 45900400-102

The Honeywell Flange 45900400-102 is a boiler pipe fitting used to connect pipe sections or appliances in burner and boiler systems. It features a connection size of Rp 1/2" and dimensions of 32x32x17 mm. This flange includes a ring gasket and four fixing screws for installation. It is compatible with Honeywell VK41xx, VK81xx, V(R)47xx, and V(R)87xx series valves.

When selecting a replacement flange of this type, ensure the nominal diameter, pressure rating, bolt hole diameter, number of bolts, and sealing face type match the original. The bolt pattern and overall dimensions must align with the appliance design, as generic substitutes are rarely possible. Verify the mating flange has the same drilling standard and use the appropriate gasket or o-ring. Check bolt length and grade for the operating conditions, and tighten bolts evenly to the manufacturer's specified torque.

Flanges of this kind may fail due to gasket deterioration, corrosion, or improper bolt torque, leading to leaks at the joint. Symptoms include visible fluid or gas leakage, pressure drops, or soot buildup around the connection. Inspect the sealing surfaces for damage, verify gasket condition, and ensure bolts are tightened to specification.