Flag Intrusive Welding Pig Signaller Detector！

Working principle
Taking sn2-tqz as an example, the end of the movement mounted on the base has a bidirectional trigger striker. The striker penetrates into the inside of the pipe near the pipe wall. When the pig passes through, the striker is pulled and the connecting rod is pulled to make the flag cap pop up. After the flag cap pops up, it will remain in the ejected state before the manual reset. This indicates that the pig has passed.
After the pig passes, the striker will automatically return. At this time, press the flag cap forcibly to reset it and enter the standby state.