Description
Tower Straight Automatic Bypass Valve – ABBV1ST
The Tower ABBV1ST Straight Automatic Bypass Valve is designed for central heating systems where a boiler bypass is required, particularly in installations fitted with thermostatic radiator valves (TRVs). Its straight-through configuration makes it ideal for inline pipework layouts while ensuring stable system operation and supporting pump overrun functionality once zone valves have closed.
As TRVs respond to rising room temperatures and begin to close, resistance within the heating system increases. The ABBV1ST automatically compensates by adjusting its internal bypass flow to maintain a pre-set differential pressure, ensuring a consistent and controlled circulation path between the flow and return. This controlled pressure regulation helps to reduce system noise often caused by closing TRVs or motorised valves, while also minimising wear on the pump impeller that can occur under high resistance conditions.
By maintaining a steady minimum flow rate through the boiler, the ABBV1ST helps to protect the boiler heat exchanger from thermal stress and contributes to improved system efficiency and longevity. The valve is capable of handling flow rates of up to 50 litres per minute and features an adjustable differential pressure range between 0.1 and 0.6 bar, allowing precise tuning to suit system and boiler manufacturer requirements.
Supplied with 22mm compression fittings, the ABBV1ST integrates easily into standard domestic heating pipework. For correct operation, it should be installed in a bypass loop between the flow and return after the pump, ensuring the direction of flow matches the arrow marked on the valve body. The required pressure setting is selected using the adjustment head, then securely locked in place with the top locking screw to prevent accidental adjustment once commissioning is complete.
The Tower ABBV1ST Straight Automatic Bypass Valve provides dependable pressure control, quieter system operation, and essential protection for pumps and boilers, making it a practical and reliable component in modern heating systems using TRVs and motorised zone valves.
Full technical specifications, installation guidance, and pressure setting information can be found in the specification tab above.
Key features
- High Flow Rate: Capable of handling up to 50 litres per minute.
- Pressure Range: Adjustable differential pressure between 0.1 and 0.6 bar.
- 22mm Compression Fittings: Easy-to-fit standard fittings for seamless integration.
- Noise Reduction: Minimises noise caused by TRVs and zone valve operation.
This ABBV1ST auto-bypass valve is a practical choice for domestic heating systems where dependable operation, clear control and straightforward installation are important.
- SPARES2GO 22mm Straight Automatic Bypass Valve
- 22mm straight automatic bypass valve, for installation in systems where a boiler bypass is required - typically when a system is equipped with thermostatic radiator vaIves (TRV‘s), and to allow pump overrun operation after zone valves have closed down
- High capacity flow up to 50 litres per minute
- Wide differential pressure range 0.1 bar to 0.6 bar
- 22mm Compression fittings
- Reduces system noise
- Maintains an even system pressure
- Constant flow through boiler
- Lockable set pressure
- Arrives boxed
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