Backflow prevention is important for systems that supply drinking water or otherwise need to maintain a clean source of water. For example, a double-check valve could be used in your kitchen sink's faucet to ensure that no contaminants enter your home's drinking water supply by backflowing through the tap when you're not actively using it.

A qualified plumber can install a tempering valve, however, a plumber with a TMV licence is the only one who can install a thermostatic mixing valve.

A tempering valve is a temperature-sensitive 2-inlet or 3-inlet mixing valve which pulls water from your hot water system, mixes it with cold water and delivers it to a faucet. General household use requires hot water to be no hotter than 60°C, however, appliances such as dishwashers and washing machines may have differing settings.

Double-check valves prevent water from flowing backward via a diaphragm located beneath the seat of the valve body (the part that opens and closes). When a force is applied against this diaphragm, such as when pressure increases inside a line or tank during operation, it compresses and pushes against a spring attached to both sides of it like so.

Valves are used to control the flow of water in systems. Check valves and double-check valves are two types of valves that have different purposes. Check valves prevent backflow, while double check valves protect against both forward and reverse flow of water.

We have covered a lot of information in this article, but hopefully, your understanding of these valves will help you to choose the right one for your application. If you're looking for more information about different types of valves, check out our blog post on the subject!

The last layer of protection on a double-check valve is often a diaphragm that closes against a seat when water travels backward.

A thermostatic mixing valve, or TMV, is a great little gadget that blends both hot and cold water together to achieve a particular, predetermined water temperature when delivering water through a faucet.

Tempering valves are adjustable and temperature-activated, meaning they moderate hot water flow when necessary to ensure water isn’t too hot when it is delivered to a tap. Hot water that is stored in a hot water storage system should be kept at a temperature of at least 60°C, however, water should be delivered through a faucet at a maximum of 50°C. A tempering valve works by blending hot water with cold water so it flows through your tap at the correct temperature, within 3°C +/-.

For example, if you have a pump that is pushing water down into the ground and then back up again, it is good practice to put a check valve right before your pump so that the water cannot flow back into your system. This will keep all of your plumbing clean and free from dirt and debris that might cause clogs or damage. Check valves also help prevent freezing and bursting pipes during winter months when temperatures drop below freezing outside, so they're especially useful for warmer climates where there might be more frequent periods of freezing temperatures throughout the year (like Florida).

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Check valves are used to prevent water from flowing in the wrong direction. They are placed in pipes and other areas where it's important for the liquid to flow only one way. Double-check valves are also required to stop backflow, but they have an additional barrier that prevents water from traveling backward. Single check valves allow water to pass in one direction but prevent it from flowing in the opposite direction.

The wonderful little device that helps achieve the right hot water temperature is either a tempering valve or a thermostatic mixing valve, which can easily be mixed up but are actually two different things. To help you decipher between the two and figure out which one is best for your needs, take a read of the below information or give Brisbane Plumbing and Drainage a call on 1300 616 203 and we would be happy to assist.

A check valve is similar to a gate valve but has a spring attached to one of the two parts holding the valve open. This means that when water travels in the wrong direction, the spring pushes back and closes the valve.

Check valves can also be used in other types of industrial processes such as oil refineries where it's necessary for machinery like pumps or compressors to function properly without getting clogged up with dirt or debris from leaking pipes nearby.

In addition to having backflow preventers installed at regular intervals along the line, double-check valves must also be tested regularly to ensure that they work properly.

When you turn the tap on in your home or workplace, you expect water at the correct temperature to be delivered – whether that be hot, cold, warm or something in between.

Double-check valves work like single-check valves but have an additional barrier that prevents water from traveling backward.

Double-check valves are useful for systems where backflow needs to be prevented—for example, those that supply drinking water or irrigation systems. Check valves can also be used as flow control devices on pumps and other equipment with different flow rates needed at different times throughout their operation cycles (for example, variable frequency drives).

Because of this unique design feature, check valves are different from gate valves or ball valves: they can only be used for one-way flow systems (like draining pipes). You can't use a check valve for any other purpose than what it's designed for—and if you try using it as something else, you'll end up with problems!

If you have any further questions regarding tempering valves, TMVs or other hot water arrangements, give Brisbane Plumbing and Drainage a call on 1300 616 203 and we would be happy to discuss your hot water needs.

We specialise in providing professional maintenance plumbing services – 24 hours a day, 7 days a week everywhere in Brisbane. If you have an emergency plumbing situation then contact our office and we will come to you ASAP!

For two reasons – for safety and in accordance with the regulations. For the safety of those using a tap and to avoid injuries such as scalding, a tempering valve or TMV ensures the water being released from the faucet is not above 60°C (140°F) for tempering valves or 45°C (113°F) for TMVs. Additionally, in accordance with Australian regulations (National Plumbing and Drainage Standard AS/NZS 3500.4: 2003), various water installations are not permitted to deliver water at a temperature higher than 60°C/45°C for different fixtures.

Check valves are used in systems to prevent water from flowing in the reverse direction while allowing water to pass in one direction.

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This means that all hot water system replacements should have a tempering valve installed. Some hot water system repairs do not require a tempering valve to be installed, but we suggest speaking to your plumber anyway to see if this is an option (it should be!).

A TMV works by mixing hot and cold water together to achieve a particular temperature (within 1°C +/-) to be delivered in various. The temperature is usually preset by a plumber or a qualified tradesperson who has installed the device, and the element within a TMV that is sensitive to thermal activity automatically arranges the appropriate levels of hot/cold water to create the correct temperature of the liquid.

The spring is the key to checking valves. Spring is a metal wire that gets bent into an arch shape, which allows it to push back against force and close the valve. When water travels in the wrong direction, the spring pushes back and closes the valve. This prevents water from traveling backward through your pipes.

Tempering valves are generally used in residential homes for personal hygiene purposes, where water delivery is a maximum of 50°C (122°F)

Double-check valves are useful for systems where backflow needs to be prevented, such as those that supply drinking water.

Tempering valves are required to be installed in the following situations (in accordance with the Plumbing Code of Australia):

TMVs are generally used in environments that include high-risk persons, such as children, the elderly and the sick, that require a lower water delivery temperature (usually 45°C or 113°C as a maximum).