The expansion vessel helps keep the pressure consistent and prevents sudden changes. If this is faulty or damaged, the pressure might be raised. Do not attempt to inspect or fix this yourself – it’s a professional job.

Double-detector check-valve assemblies shall conform to ASSE 1048. These devices shall be capable of operating under continuous pressure conditions.

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Water will squirt out, so you should also protect any wallpaper and carpets nearby. Bleeding a radiator will get the job done, but it’s very slow, so one of the methods above is preferable if available.

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The filling loop is where water enters the system from the mains, and consists of two valves. When both valves are open, the system lets more water in, and the pressure rises.

Central heatingpressure relief valve

Check valves are generally installed in pipelines to prevent backflow. A check valve is basically a one-way valve, in which the flow can run freely one way, ...

375 REDUCED PRESSURE PRINCIPLE. 1. Start with both shut-off valves closed. Slowly open the inlet shut-off valve until the backflow preventer is com-.

A digital gauge will be an LCD, LED or screen type, and might be multi-function, i.e. it shows other information such as timers, temperatures or whether the boiler is serving central heating or hot water. Sometimes you have to press a button to scroll through different measurements until you reach the pressure indicator.

Many (but not all) central heating systems have a filter, which water continually cycles through to remove impurities. They also double up as drainage valves, and are perfect for relieving pressure in the system. You’ll normally find the filter near the boiler, as it should be located between the last radiator and the boiler to ensure your boiler is best protected. It’ll be either conical or cylindrical in shape, with a valve at the bottom. Put a bucket under the filter, open the valve and keep an eye on the gauge. Close the valve when it reaches 1 bar.

It’s possible that someone has responded to low pressure in the past (for example after bleeding the radiators) by adding more water via the filling loop. While that’s the right thing to do, people sometimes overfill it by accident.

It will be a Y-shaped or T-shaped component branching from the pipework, with a valve that might require a spanner to open. Place a bucket or tub underneath it and open it up, checking the pressure on the boiler. Close the valve when it reaches 1 bar.

A prime suspect for high pressure is these valves being left open accidentally. They turn by 90 degrees, and if the handle is aligned with the pipe, it means it’s open. Make sure they are both closed – your system circulates its water, and rarely needs topping up.

High pressure is unlikely to be dangerous, even if it’s a lot higher, as your system should have a pressure relief valve that will trigger. However, you should not rely on this to prevent overpressurisation. First, it’ll be inefficient, and second, it could be dangerous if the relief valve is faulty or jammed.

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As well as releasing air trapped in the system, bleeding can also be carried out to lower the water pressure. We’ve written an article on bleeding radiators here, but in summary, locate the bleed valve on a radiator, place a bucket or tub underneath or next to the valve, and open the valve gently.

Wondering what your boiler pressure should be, whether high boiler pressure is dangerous, or how to make sure your boiler stays in the optimum range? Ideal Heating have got the answers to all of these questions and more.

If you don’t have a filter, you might have a drain-off valve (also known as a drain cock). This is located in the pipework for the central heating system. It could be anywhere, and there could be several, but if there’s just one it will probably be downstairs.

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In the unlikely event that the pressure gauge is faulty, another tell-tale sign is leakage from your central heating system. It normally starts at the weakest link, so will show itself at joints, often where pipework joins radiators. If you see puddles, it’s worth checking your pressure. But you’ll also need to have the leak fixed by a plumber.

Once you’ve diagnosed high pressure in your boiler system, the next step is to reduce it. There are several ways to release this pressure and we’ve ordered them by ease - however the techniques are not all available to every system.

An analogue display will look like a clock face or speedometer, with a needle pointing to the pressure. It will have numbers around the edge, but it should also have some kind of indication of where the ideal range is, for example a shaded area or two lines marking the maximum and minimum pressures.

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Once you’ve got your pressure back to normal range, you should investigate why it has happened in the first place. Take a look at the suggestions below.

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This is a more specialist job, and should only be attempted if none of the above are available, and you’re a confident DIYer. Place a container underneath a radiator nut that connects the pipework to the radiator, and gently undo the nut with a spanner.

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Limit the flow of water with a pressure-reducing valve. This device works by limiting how much pressure is inside the valve, causing friction and reducing the ...

535071H 1 ¼ Altecnic Caleffi Prescal® Series 5350 High Performance Pressure Reducing Valve with Complete Gauge & Self-contained Replaceable Cartridge.

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The first port of call should be your pressure gauge. This will be on the boiler itself, and will take one of two forms: an analogue (pointer) display or a digital display.

Sometimes there’s a detachable length of hose that connects to the two valves in the filling loop, rather than permanent pipework. If it’s the hose type of loop and the hose is not connected, you can rule out the valves being open as you’d see water pouring out!

If you haven’t had your annual service in the past 12 months, book one now, as it might reveal an issue with your system. Similarly, if you keep getting high pressure and don’t know why, it’s time to call out a Gas Safe Registered engineer to have a look at your boiler.

Reverse osmosis is a pressure-driven general water treatment process that uses a membrane to separate dissolved minerals and contaminants from water.

You’ll get a much faster flow than with bleeding, so be prepared for splashing and get ready to tighten up the nut quickly in case you need to.