Page 30 - TFC 2022 Catalogue

Valves and Motors

22mm Automatic Bypass Valve

Product Code ABBV1

The Tower auto bypass valve (ABV) should be fitted where a boiler bypass is required – typically this is the case when a system is
equipped with thermostatic radiator valves (TRV’s), and to allow pump overrun operation after zone valves have closed down.
TRV’s slowly close down as each radiator raises the room temperature. To overcome flow restriction as TRV’s close down, the ABV is
adjusted to the required set point. As the system resistance increases due to TRV’s closing, the ABV allows flow to increase, in order to
maintain the required pre-set system differential pressure. The regulation provided will reduce system noise that can result from
TRV’s or zone valves closing, eliminate pump impeller wear that can result from high flow resistance, and enhance the life of the
boiler’s heat exchanger by ensuring minimum flow rate at all times.

• Regulates heating system differential pressure
• High capacity flow, up to 50 litres per minute
• Differential pressure range: 0.1 to 0.6 bar
• 22mm compression fittings
• Reduces system noise
• Lockable set pressure
• Constant flow through boiler
• Equivalent to Honeywell DU145

• 110°C max working temperature

28 www.tfc-group.co.uk 01732 351680 sales@tfc.uk.com