"I would estimate over the length of this project, I have spent 50% less time designing than I would on our previous software.

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The strategic placement of heat pumps and careful sizing of pipework were crucial in maintaining minimal pressure drops over an 18-metre distance."

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Yes, by allowing water to be stored and circulated at high temperatures, inhibiting Legionella growth, and then reducing it to a safe temperature, mixing valves indirectly help reduce the risk of Legionnaires’ disease.

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Understanding these valves, which are essential components in modern plumbing systems, is crucial for ensuring safety, efficiency, and compliance with regulatory standards.

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With the adoption of the Plumbing Code of Australia (PCA) 2022 on the 1st May 2023, NSW Fair Trading is informing the plumbing and drainage industry to the new requirements to cross connection and backflow control that will take effect.

The maintenance frequency depends on water quality and usage and typically includes regular checks for scale buildup and operational testing.

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A high hazard device such as a Reduced Pressure Zone Device (RPZD) must be installed with a handheld bidet hose and trigger spray. The high hazard device must be installed to individually to protect against the hazard at each handheld bidet hose and trigger spray.

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TMV valveregulations

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In many regions, building codes mandate the installation of mixing valves in certain settings, such as residential homes and healthcare facilities, for safety reasons.

TMVs also have a fail-safe mechanism that shuts off the water flow if the cold water supply fails, preventing dangerously hot water from being delivered.

The set temperature should balance safety to prevent scalding (typically around 40°C or 105°F) and effectiveness in controlling bacteria while adhering to any specific building or health and safety regulations.

TMVs are typically used in more demanding environments, like healthcare facilities, where maintaining a constant temperature is crucial.

It’s a specialised type of valve designed to precisely control water temperature, ensuring safety and comfort in plumbing systems.

A prescribed individual or zone hazard must have an appropriate backflow prevention device selected and installed in accordance with Section 4 of AS/NZS3500.1:2021. The device selected must be suitable for the hazard rating, and protect as required for back pressure and/or back siphonage.

Yes, most mixing valves allow for post-installation temperature adjustments to suit user preferences or comply with updated safety standards.

Individual and Zone Hazard scenarios are prescribed in Specification 41. Specification 41 lists out common scenarios of hazards.

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(a) be zone protected from above ground, buried, or partially buried rainwater tank in Class 1 Buildings, utilising a non-testable device: or

TMV valvetemperature

(b) if a drinking water service to the cooling tower passes through the basin, the service pipe must be provided with a double wall protection; and

To resolve this, mixing valves are used to reduce this hot water to a safer, warm temperature by blending it with cold water.

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CASE STUDIES Greengate, UK "I would estimate over the length of this project, I have spent 50% less time designing than I would on our previous software. The ability to output the design straight into Revit assisted clash detection and coordination." Read the full case study

Mixing valves blend hot and cold water to deliver it at a safe and consistent temperature, helping prevent scalding while ensuring comfort.

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"The software offers precision through detailed result outputs and advanced options for efficient pipe sizing, allowing heating engineers to optimise based on parameters like maximum velocity and pressure drop."

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TMV valveinstallation

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Step into the realm of plumbing valves and find out everything you need to know about mixing valves, which includes uncovering the distinctions between tempering valves and thermostatic mixing valves (TMVs).

The air gap faucet is a plumbing device designed to provide a siphon break for the drain line of an undersink reverse osmosis unit.

If the cold water supply to a TMV fails, the valve will shut off the flow of hot water as a fail-safe measure to prevent scalding.

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In all instances, where the Watermark Product Description does not indicate to contain a high hazard protection integral of the Bidet Douche Seat, a high hazard device such as a Reduced Pressure Zone Device (RPZD) must be installed. The high hazard device must be installed to individually to protect against the hazard at each toilet douche seat. See below example installation diagram:

This valve is particularly useful in preventing extreme temperature variations, making it an ideal choice for environments requiring precise temperature control.

This ensures the water at the point of use is at a comfortable and safe temperature, balancing the need for Legionella control with the prevention of scalding.

CASE STUDIES Award-Winning Heating Design "Using h2x was pivotal, allowing for precise heat loss calculations, pipe sizing and flow rates for each room. This level of detail ensured that the heating load accurately matched each space's requirements, minimising energy waste and maximising comfort. The strategic placement of heat pumps and careful sizing of pipework were crucial in maintaining minimal pressure drops over an 18-metre distance." Read the full case study

This level of detail ensured that the heating load accurately matched each space's requirements, minimising energy waste and maximising comfort.

Water in plumbing systems is heated to high temperatures, often above 60°C (140°F), primarily to control the growth of Legionella bacteria, which thrive in warm but not hot environments.

Part B5 of PCA 2022 prescribes the Deemed-to-Satisfy requirements where a hazard exists for water or contaminants to enter a drinking water service, non-drinking water service and/or rainwater service from:

This high temperature effectively inhibits the bacteria, reducing the risk of Legionnaires’ disease. However, such high temperatures pose a scalding risk to users.

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In some instances a Bidet Douche Seat has a suitable high hazard protection integral of the seat. The integral high hazard protection usually in the form of an Air-Gap, or Atmospheric Vacuum Breaker (AVB) must be listed on the Watermark Product Description which can be found on the Watermark Product Database

In this blog, we’ll explore the requirements and intricacies of mixing valves, including the differences between tempering valves and thermostatic mixing valves (TMVs).

They are mandated in various building codes, especially in settings where there is a risk of scalding, such as in hospitals, schools, and elderly care facilities.

Specification 41 – S41C4 Individual Protection prescribes that each Bidet Douche Seat where the outlet in any position is not 25mm above the overflow level of the pan requires individual high hazard protection.

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Regulations issued under water supply legislation, and/or rules set by the Network Utility Operator (NUO), may prescribe containment protection which differs from Specification 41.

In conclusion, understanding the differences and appropriate applications of mixing valves, tempering valves, and TMVs is essential for any plumbing engineer.

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CASE STUDIES Salon Republic, USA "The quality of the designs saw significant improvement with the adoption of h2x." "The software offers precision through detailed result outputs and advanced options for efficient pipe sizing, allowing heating engineers to optimise based on parameters like maximum velocity and pressure drop." Read the full case study

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The PCA 2022 is available to be viewed on the Australian Building Codes Board (ABCB) website. See the below links to the specific parts covering cross connection control and cross connection hazards:

They blend hot and cold water to a safe temperature and maintain this temperature even when the incoming water temperatures fluctuate.

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The user-friendly interface by h2x aids engineers in creating top-notch designs and improving productivity, ensuring compliance with industry standards.

A TMV uses a thermostatic element to sense the outlet temperature and adjusts the mix automatically, providing an additional layer of safety.

Ideally, mixing valves should be installed close to the point of use to minimise the length of mixed water in the pipes, reducing bacterial growth risk and ensuring rapid temperature response.

This mechanism ensures a consistent output temperature, safeguarding against sudden fluctuations that could lead to scalding.

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(c) if a fast fill connection is required, the fast fill line shall terminate externally to the unit, with an air gap over wither the basin or a tundish.

NSW Fair Trading disclaims any liability (including for negligence) to any person in respect of anything done, or not done, by that person in whole or partial reliance on any of the information in this advisory note.

Thermostatic MixingValvetap

Information contained within this document is current as of May 2023 and refers to codes and standards current at the time of writing.

Where a hazard scenario is not prescribed in Specification 41, the Performance Requirements of Part B5 are to be met, including the determination of the hazard rating using the Verification Method as well as the submission of a Performance Solution. In lieu of submitting a Performance Solution for a hazard that is not described, a default high hazard device suitable to protect against back pressure and back siphonage can be used (eg RPZD, RBT, RAG).

This placement minimises the dead leg of mixed water, reducing the risk of bacterial growth and ensuring quick response to temperature changes.

TMV valveadjustment

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Inside the valve, a control element, such as a diaphragm or a thermostatic element, responds to the incoming water’s temperature and pressure.

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A TMV includes a thermostatic element that automatically adjusts the mix of water in response to temperature changes, maintaining a stable output and providing a fail-safe against scalding.

The software automates flow rate, velocity, pressure, pump duty, plant size, and recirculation system calculations, freeing you from tedious math.

The valve dynamically compensates for changes in water pressure and temperature, maintaining a stable and comfortable water temperature for the user, regardless of variations in the plumbing system.