Automatic bypass valve is the only way to provide a boiler
bypass
Automatic bypass valves such as the Honeywell DU145
have been endorsed by the heating industry as the only
acceptable means to regulate water flow through the
boiler bypass circuit. A gate valve or other fixed
orifice opening is no longer acceptable, even when a
flow gauge is used to set a minimum flow rate, because
it reduces boiler energy by allowing excessive or
unknown flow through the bypass.
Whereas an automatic bypass allows flow only when
necessary and then by only as much as is required,
industry tests show that a fixed orifice bypass allows
heat wastage through the bypass even at times of maximum
heat demand from radiators. The Honeywell DU145
automatic bypass valve has a unique and simple
adjustment mechanism that prevents flow through the
bypass while system valves are open, and increases water
flow automatically as valves close – so raising energy
efficiency by minimising bypass flow whilst providing a
safe flow path around the boiler as specified in Good
Practice 302.
Email:
literature@honeywell.com
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