Honeywell DU144A1001 Straight Automatic Bypass Valve

Plumbing Superstore

This straight bypass valve controls water flow in heating circuits based on water pressure. It's perfect for keeping a minimum flow rate through the boiler & reducing circulation pressure during closed water paths. A bypass circuit is necessary if a boiler manufacturer requires it or to maintain minimum flow when the boiler fires. Essential for systems with many thermostatic radiator valves (TRVs), it stays closed when TRVs are open & gradually opens as they close, ensuring smooth water flow. It also cuts down noise from excess water velocities. Easy-grip knurled handwheel, differential pressure settings between 0.1 & 0.6 bar, high-visibility markings for low-light areas, compression fittings for 22mm copper pipe, a protective cap to limit settings access, & factory setting at 0.2 bar. It supports a high flow rate of up to 1.5m2 per hour & has spanner flats for tight fittings. Manual or fixed position valves fail to regulate flow & let water bypass unnecessarily.. Honeywell Home Straight Bypass Valve - 22 mm

City Plumbing

The Honeywell DU144 automatic bypass valve controls the flow of water through a bypass circuit which is fitted between flow and return pipework, typically at or near the boiler. Building Regulations advice states that if a bypass is installed, an automatic bypass valve should also be fitted. It saves energy by only allowing flow through the bypass when needed, in conditions like when flow through the system is reduced, zone valves or radiator thermostats are closing.

ManoMano

The Honeywell DU144 automatic bypass valve controls water flow in the heating circuit according to the water pressure across it and is used to maintain a minimum flow rate through the boiler and to limit circulation pressure when other water paths are closed.