The Evolve 22mm Angled Automatic Bypass Valve (ABV22) is a vital addition to central heating systems that require consistent water circulation, even when some or all of the radiator valves are closed. Many boiler manufacturers recommend or require a bypass valve to maintain the minimum flow rate through the boiler’s heat exchanger, helping to prevent overheating or damage to the system.
This angled valve is especially useful in sealed systems where there isn’t a natural path for water when radiator thermostatic valves are shut. It works by automatically opening when the system pressure increases, maintaining a balanced flow and protecting both the boiler and pump from excess pressure.
Designed for Quiet and Reliable Operation
One of the key benefits of the Evolve ABV22 is its ability to eliminate unwanted system noise. As pressure builds in the circuit, the valve gradually opens, allowing water to bypass the radiators and flow back to the boiler. This not only reduces noise caused by pressure build-up but also helps maintain energy efficiency and extends the lifespan of the pump and boiler components.
The angled design of the valve makes it easy to install in tight or awkward pipework configurations, providing flexibility for installers without compromising performance.
How It Works
The automatic bypass valve operates based on system pressure. When radiator valves begin to close and water has fewer routes to travel through the system, pressure can rise. The ABV senses this pressure increase and opens accordingly, diverting water and reducing the strain on the system. When more radiators open, pressure drops and the valve closes again—automatically adjusting to match the system’s needs in real time.
Product Benefits
Maintains minimum flow rate required by boiler manufacturers
Improves system efficiency and reliability
Reduces pump strain and boiler wear
Minimises noise associated with excess pressure
Automatically adjusts without the need for manual intervention
Angled design for flexible installation
Frequently Asked Questions
Why is an automatic bypass valve needed in a heating system?
An automatic bypass valve helps regulate pressure when radiator valves (especially TRVs) are closed. Without a bypass, the pump may push against closed circuits, causing strain, noise, and potential boiler damage. The ABV ensures water keeps flowing safely.
Where should the Evolve ABV22 be installed?
It should be installed between the flow and return pipework, typically as close to the boiler as possible. The angled design allows for more adaptable placement in confined spaces or systems with rigid pipe runs.
Is this valve adjustable for different pressure settings?
Yes, the Evolve ABV22 typically allows for pressure adjustment during installation. This ensures it opens at the appropriate point to suit the specific requirements of your central heating system.
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