What are the two types of SOPVs?

What are the two types of SOPVs?

• A. Primary and Secondary
• B. Master and Group
• C. Local and Remote
• D. Manual and Automatic

Answer: (B)

The thing being tested is how the foam system isolates flows. In SOPV setups for AFFF transfer, there are two levels of shut-off valves designed for different isolation needs: the Master valve and the Group valves. The Master valve serves as the main shut-off that can completely isolate the entire foam system. The Group valves are placed at sections or banks within the system and can shut off foam flow to just a portion of the network without affecting the rest. This split—system-wide control versus sectional control—lets you perform maintenance or tests on one area while keeping the others running, and it supports a safer, more flexible shutdown and restart process.

The thing being tested is how the foam system isolates flows. In SOPV setups for AFFF transfer, there are two levels of shut-off valves designed for different isolation needs: the Master valve and the Group valves. The Master valve serves as the main shut-off that can completely isolate the entire foam system. The Group valves are placed at sections or banks within the system and can shut off foam flow to just a portion of the network without affecting the rest. This split—system-wide control versus sectional control—lets you perform maintenance or tests on one area while keeping the others running, and it supports a safer, more flexible shutdown and restart process.