This is the fire safty testing for the gate valve, and Didtek succeess past the testing according API 6FA standard.

Reliable fire protection is the requirement for industrial valves in sensitive applications where fire accidents can happen easily. The valves used in the oil and gas, refinery, chemical, and petrochemical industries must guarantee a reliable and safe shut-off in case of fire. Fire-safe design is an important criterion for such industrial valves. The term fire-safe means the ability of the valve to minimize the amount of process lost (leakage) downstream or to the atmosphere after a fire test.