Product Description

Tower ABBV1 Automatic Bypass Valve 22mm

Model: ABBV1

The Tower ABBV1 Automatic Bypass Valve helps control differential pressure in a domestic central heating system. It also maintains water flow through the boiler when thermostatic radiator valves or zone valves begin to close.

As a result, the valve can reduce unwanted system noise and help protect the boiler and circulating pump. It also supports pump overrun by providing a flow path after motorised zone valves have closed.

The ABBV1 has standard 22mm compression connections. In addition, the adjustable setting covers a differential pressure range from 0.1 to 0.6 bar.

Key Features

• Automatic central heating bypass valve
• Regulates system differential pressure
• Maintains water flow through the boiler
• Supports boiler pump overrun
• Helps reduce heating-system noise
• High flow capacity of up to 50 litres per minute
• Adjustable differential pressure from 0.1 to 0.6 bar
• Lockable pressure setting
• 22mm compression connections
• Suitable for compatible domestic heating systems
• Useful for systems with thermostatic radiator valves
• Model: ABBV1

Tower ABBV1 Automatic Bypass Valve Specification

• Download the Tower ABBV1 Specification Sheet
• Download the Automatic Bypass Valve Installation Guide
• Brand: Tower
• Product type: automatic bypass valve
• Model: ABBV1
• Connection size: 22mm
• Connection type: compression
• Differential pressure range: 0.1 to 0.6 bar
• Maximum flow rate: up to 50 litres per minute
• Pressure setting: adjustable and lockable
• Application: domestic wet central heating systems

What Is Included?

• 1 x Tower ABBV1 Automatic Bypass Valve
• 22mm compression connections
• Model: ABBV1

What Does an Automatic Bypass Valve Do?

An automatic bypass valve creates an alternative water-flow route between the heating-system flow and return pipes. It begins to open when the pressure difference reaches the selected setting.

For example, thermostatic radiator valves may close as rooms reach the required temperature. This reduces the available flow around the system. Therefore, the bypass valve can open to maintain circulation and control differential pressure.

The valve can also allow water to continue circulating during boiler pump overrun. As a result, it helps move remaining heat away from the boiler after the heating demand ends.

Suitable Applications

The Tower ABBV1 is suitable for compatible wet central heating systems where an automatic bypass is required. Typical applications include:

• Heating systems fitted with thermostatic radiator valves
• Systems with motorised zone valves
• Boilers that require a minimum water-flow rate
• Systems that use boiler pump overrun
• Heating systems affected by pressure-related noise
• New central heating installations
• Replacement of a compatible automatic bypass valve

Always check the boiler manufacturer’s instructions before selecting and setting the valve. The boiler may require a specific minimum flow rate or bypass arrangement.

How the Adjustable Pressure Setting Helps

The ABBV1 provides an adjustable differential pressure range from 0.1 to 0.6 bar. Therefore, the installer can set the valve to suit the requirements of the heating system.

Once set, the valve remains closed during normal circulation. However, it begins to open when increasing system resistance raises the differential pressure. The lockable control then helps prevent accidental changes to the selected setting.

Installation Guidance

• Install the valve between the heating flow and return pipes
• Follow the direction-of-flow marking on the valve body
• Use the correct setting for the boiler and heating system
• Check the boiler manufacturer’s minimum-flow requirements
• Make sure the 22mm compression joints remain secure and watertight
• Flush the heating system before fitting new components where required
• Test the complete system after installation
• Follow the supplied installation instructions

A competent heating engineer should select, fit and commission the valve. Incorrect positioning or adjustment may prevent the heating system from operating correctly.

Why Choose the Tower ABBV1?

The Tower ABBV1 offers a simple way to control changing pressure within a central heating system. Its adjustable setting allows the installer to match the valve to the system more accurately.

Furthermore, the high flow capacity supports compatible domestic heating installations. The standard 22mm compression connections also make it suitable for many common UK heating-system layouts.

Overall, the ABBV1 can help maintain boiler flow, support pump overrun and reduce pressure-related noise when correctly installed and adjusted.

Why Buy from SNH Tradecentre?

SNH Tradecentre supplies heating controls, valves and plumbing products to professional installers and homeowners. Our experienced team can also help you check whether this valve suits your heating system.

• Experienced plumbing and heating merchant
• Helpful product advice
• Products for trade and domestic customers
• Secure online ordering
• Fast UK delivery options
• Collection options where available
• Support before and after your purchase

If you need help before ordering, contact SNH Tradecentre on 01843 842727.

Frequently Asked Questions

When is an automatic bypass valve required?

A heating system may need an automatic bypass when it uses thermostatic radiator valves, motorised zone valves or a boiler with minimum-flow requirements. Always follow the boiler manufacturer’s instructions.

What size connections does the ABBV1 have?

The Tower ABBV1 has 22mm compression connections.

What is the adjustable pressure range?

The valve provides a differential pressure adjustment range from 0.1 to 0.6 bar.

Can it help reduce heating-system noise?

Yes. When correctly adjusted, it can help reduce noise caused by excessive differential pressure as radiator or zone valves close.

Does it support pump overrun?

Yes. The valve can provide a circulation route when zone valves have closed, which supports compatible boilers with pump-overrun operation.

Where should the bypass valve be installed?

The installer normally fits it between the heating flow and return pipes. However, the exact position must follow the boiler and system-design instructions.

Can I set the valve myself?

A competent heating engineer should calculate and set the valve correctly. An unsuitable setting may reduce system performance or prevent adequate boiler flow.