What type of valve shall be installed in the water supply for a manual wet standpipe system?

What type of valve shall be installed in the water supply for a manual wet standpipe system?

• A. Indicating valve
• B. Gate valve
• C. Ball valve
• D. Check valve

Answer: (A)

In a manual wet standpipe system, you must have a valve that shows, at a glance, whether the water supply to the standpipe is open or closed. That visibility is essential so responders can quickly verify the system is pressurized and ready when needed. This is provided by an indicating valve, a shutoff valve equipped with a mechanical indicator that clearly displays the valve’s position. The indicator lets you confirm the water supply status without guessing from the handle position alone, which is crucial during an emergency and during routine testing or maintenance. A standard gate valve or ball valve can shut off the water, but without a built-in indicator, you won’t have immediate, reliable proof of whether the valve is open. A check valve, on the other hand, prevents backflow but does not serve as the primary supply shutoff for the standpipe and does not provide an indication of position. So, neither of those options fulfills the requirement for an indicating valve. In short, the indicating valve meets both the control and the visibility needs for the water supply to a manual wet standpipe, ensuring the system can be quickly verified as ready for use.

In a manual wet standpipe system, you must have a valve that shows, at a glance, whether the water supply to the standpipe is open or closed. That visibility is essential so responders can quickly verify the system is pressurized and ready when needed.

This is provided by an indicating valve, a shutoff valve equipped with a mechanical indicator that clearly displays the valve’s position. The indicator lets you confirm the water supply status without guessing from the handle position alone, which is crucial during an emergency and during routine testing or maintenance.

A standard gate valve or ball valve can shut off the water, but without a built-in indicator, you won’t have immediate, reliable proof of whether the valve is open. A check valve, on the other hand, prevents backflow but does not serve as the primary supply shutoff for the standpipe and does not provide an indication of position. So, neither of those options fulfills the requirement for an indicating valve.

In short, the indicating valve meets both the control and the visibility needs for the water supply to a manual wet standpipe, ensuring the system can be quickly verified as ready for use.