On the outlet side of the groove check valve, a 2” diameter drain hole is provided. When the fire protection system is running for a period of time, impurities are deposited in the system, and the plug can be quickly drained after the plug is removed, and the deposited impurities are cleaned.
Groove end connection can be mounted at least 2-4 times faster than conventional flanges. The groove connection only needs to fasten two bolts, and the relative flange connection reduces the number of bolts to be fastened, saves man-hours and improves installation efficiency.
