"Master mixing valves (TMVs and DMVs) are central devices in domestic hot water systems that blend hot and cold water to deliver a consistent, safe temperature throughout a building or facility. They are typically installed at the point of distribution and serve multiple outlets, distinguishing them from point-of-use valves. Their primary purpose is to prevent scalding (by limiting output), control Legionella growth (by allowing storage at higher temperatures), and ensure energy efficiency. The key standard is ASSE 1017, which outlines performance requirements for temperature-actuated mixing valves in hot water distribution systems.
By attending, you will be able to:
• Define master mixing valves and their role in hot water distribution systems
• Explain the operational mechanisms of TMVs and DMVs
• Compare the advantages, disadvantages, and applications of TMVs vs. DMVs
• Identify relevant standards for master mixing valves
• Select appropriate valves for various plumbing scenarios
• Understand the importance of proper sizing for master mixing valves and the limitations of traditional methods like Hunter’s Curve in modern systems"