After setting up the Grunav/Star single-valve double-interlock valve, no leakage or water flow should occur through the velocity check. True or false?

The statement is true. After properly setting up the Grunav/Star single-valve double-interlock valve, there should be no leakage or water flow through the velocity check. This is a crucial characteristic of a well-functioning double-interlock valve, which is designed to prevent any unintended water discharge until the two required conditions for operation are met – typically an alarm activation and the opening of the system control valve.

The velocity check provides an additional layer of control in the system, ensuring that water flow only occurs when conditions are appropriate for usage. If there is leakage or inadvertent water flow through this component, it indicates a malfunction or improper installation, which could compromise system reliability and effectiveness.

Thus, the correct understanding of the valve's function is critical for ensuring the safety and performance of the sprinkler system.