COUPLING FOR FLUID FLOW SYSTEM

摘要

COUPLING FOR FLUID FLOW SYSTEM A detachable coupling for connecting a fire hydrant barrel to a fire hose includes a socket in the barrel and a nozzle permanently but replaceably mounted in the socket. The socket has radially inwardly extending coupling lugs, and nozzle has radially outwardly extending coupling flanges. To mount the coupling nozzle in the barrel socket, the socket is selectively inserted into an opening in the socket with the lugs and flanges so aligned that the nozzle flanges pass by the socket lugs. The nozzle is then rotated to axially align the lugs and flanges. Releasable locking means constituted as a locking ring threadably mounted on the nozzle is used against the socket to draw the nozzle lugs back into overlying locked relation with respect to the flanges. A resilient O-ring seal is also provided in the locking ring between the socket and nozzle to prevent leakage between the coupling and the hydrant barrel.