What type of shutoff valve is used in each lateral branch from the main or riser?

The service valve is specifically designed for use in lateral branches that extend from the main line or riser in a piping system. Its primary function is to allow for the isolation of a specific section of the system without having to shut down the entire water supply. This makes it particularly advantageous for maintenance and repair work, as it enables operators to service parts of the system without disrupting overall service to other areas.

Service valves are generally strategically placed in the system to provide control and access at various points, aiding in efficient management of the distribution network. They help ensure that individual branches can be taken offline while keeping the rest of the system operational, which is crucial in complex plumbing or fire protection systems.

Other types of valves, such as riser valves or zone valves, serve different purposes within a system. Riser valves are typically located at the vertical sections of the system, controlling the flow from risers to the branches but not suitable for isolating lateral branches. Zone valves are used to control the flow within designated zones but are not employed specifically for the lateral branches from the main line. Thus, the service valve stands out as the correct choice for managing individual lateral branches effectively.