Certified Facility Manager (CFM) Practice Exam

Which statement about mixing valves is accurate?

1. They are only used in commercial settings.

2. They allow water to flow only in one direction.

3. They protect users from being burned or scalded by hot water.

4. They primarily control water pressure.

The correct answer is: They protect users from being burned or scalded by hot water.

Mixing valves are designed to blend hot and cold water to deliver a safe and comfortable temperature for users, thereby protecting them from the risk of burns or scalds caused by excessively hot water. They work by adjusting the ratio of hot and cold water to achieve the desired temperature before it reaches the outlet, such as a faucet or showerhead. This is particularly crucial in settings where vulnerable individuals, such as children and the elderly, may be present. The ability of mixing valves to prevent sudden temperature changes is essential for ensuring user safety, especially in residential and healthcare facilities. By maintaining a consistent and safe hot water temperature, they help to mitigate the risk of thermal shock and severe injuries from hot water exposure. In contrast, while mixing valves may be found in both commercial and residential settings, they are not exclusive to commercial use, nor do they solely allow water to flow in one direction or primarily control water pressure. Rather, their key function centers around the mixing of water to regulate temperature, highlighting their importance in safeguarding users from potential harm.