Which valve is located in each riser adjacent to the main line?

The riser valve is specifically designed for installation in each riser adjacent to the main line. Its primary function is to allow for controlled access to the sprinkler system within a building’s riser. This is crucial for maintenance, inspection, and testing procedures, enabling personnel to isolate sections of the system without affecting the entire system.

Riser valves are typically positioned where the water supply enters each riser, thus ensuring that they can efficiently manage flow and pressure within the system. This functionality supports safety measures during emergency situations or in routine servicing. The valve’s placement also facilitates the separation of the sprinkler system from the main water supply, which is especially important during system modifications or in the event of a malfunction.

Other valves present in the system, such as service valves, main line valves, and zone valves, have different specific purposes and locations within the water supply and distribution framework, making them unsuitable for this particular role adjacent to the riser. Hence, the designation of the riser valve recognizes its vital position and purpose within the overall fire protection design.