Which valve is designed for connecting a new main to an existing pressurized main?

• A. Tapping Valve
• B. Gate Valve
• C. Ball Valve
• D. Check Valve

Answer: (A)

Connecting a new main to an existing pressurized main requires a device that can pierce the live pipe and form a branch while the system stays in service. A tapping valve is designed for this purpose. It is used with a tapping saddle and tapping equipment to bore into the existing main and establish a branch line that can feed the new main. The valve lets you control flow into the new line after the tap and provides a way to isolate the connection if needed. In contrast, gate and ball valves are general inline isolation valves meant to shut off or regulate flow but do not provide a method to create a new branch in a live main. A check valve prevents backflow but isn’t used to connect a new main. So the tapping valve is the best fit for connecting a new main to an existing pressurized main.