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The expansion vessel is an overflow tank that gives the excess volume of water somewhere safe to go. As the water heats and expands, the additional volume is channelled into the tank, expanding the diaphragm which pushes against the compressed air, allowing space for the water to be safely stored. When the water cools, the compressed air will push against the diaphragm, returning the water into the system and maintaining the pressure at the correct levels. This enables the system to keep running at maximum efficiency.

The placement of your expansion vessel can also help minimise the risk of legionella and other microbial growth. The best position is in a cool area with cold flowing pipes and connected as close to the incoming water supply as possible. It needs to be mounted vertically in order to minimise the risk of debris becoming trapped, and it needs to have an isolation valve and drain valve to aid flushing and sampling which should be undertaken every 6 months in accordance with HSE’s guidelines.

Thermostatic control Valveradiator

Tempering valves are usually installed in standard home water heating situations. A thermostatic mixing valve would be fitted if there was a requirement for ...

TemperatureControl valvefor hot water

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Without an expansion vessel, your system would be at risk from burst pipes as well as damage to any appliances plumbed into the system, such as dishwashers and washing machines.

A ball valve is a shut off valve that controls the flow of water by means of a rotary ball having a bore. By rotating the ball a quarter turn (90 degrees) ...

Temperaturecontrol valveworking principle

Check it while it's hot: 5-second hot water maintenance · The purpose of the valve is to release pressure build-up, which occurs when the water heats up and ...

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AMOT Model J thermostatic valves are available in a wide selection of sizes and settings to fill a multitude of fluid temperature control requirements.

While companies are required by law to undertake regular comprehensive fire risk assessments, there is no specific timeline for when risk assessments need reviewing. The Regulatory Reform (Fire Safety) Order 2005 merely states that a fire risk assessment “must be...

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Fire Risk Assessments are a legal requirement for all businesses. Employers and commercial landlords must identify fire risks and take the appropriate action to remediate them to ensure the safety of everyone who uses their business premises. In a big city like...

Hydraulic Bleeder Valve is designed specifically to remove the unwanted and excess air trapped in the hydraulic system. Boiler Bleeder Valve is mostly used ...

An expansion vessel is an essential part of a pressurised hot water system. It looks like a small water tank, which is why it’s also known as an expansion tank. Inside the tank is a rubber diaphragm that separates water from the hot water system from compressed air on the other side.

When you heat water, it expands. In a hot water system where it is essential that the pipes remain full of water at all times, this would cause a problem. With nowhere for the extra volume to expand into, the pressure relief valve would have to open to expel the excess volume in order to protect the system from the resulting high pressure levels.

3-way temperaturecontrol valveworking principle

The 90 Series Pressure Reducing/Pressure Regulating Valve (PRV) automatically reduces a higher inlet pressure to a steady lower downstream pressure.

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Shutoff valves are designed to control the flow of water and other materials with either full on and full off functionality or at a specific flow rate.

Fire risk assessments are mandatory for all businesses under the Building Safety Act 2022 and The Regulatory Reform (Fire Safety) Order 2005. They are designed to identify potential fire risks on your premises, as well as the dangers facing people on your property in...

AMOT Model J thermostatic valves are available in a wide selection of sizes and settings to fill a multitude of fluid temperature control requirements.

Expansion vessels have been identified as a potential legionella risk by the HSE. This is because of the low water flow and possible stagnation problems, combined with the increased likelihood of rust and sediment, all of which will provide legionella bacteria with a good breeding environment. It is therefore a legal requirement to take action to minimise the risks, a process that begins with a legionella risk assessment.

The part of the expansion vessel that’s most likely to cause problems is the diaphragm, which is prone to damage from hard water areas. The average lifespan of an expansion vessel is between five and ten years. There are checks you can do to make sure it’s still working, such as tapping on the tank to find out how much water and how much air is in it – the tank should be hollow halfway up. You could also feel the tank to check it’s working properly – it should be warm at the bottom and cool at the top.