What is Mobrey? Mobrey is the name used for the Automatic water level controller ; it comes under the category of mountings and fittings of Steam Boiler Assembly. As the name suggests, it is used for maintaining the water level in the Boiler shell. Mobrey is mostly used in smoke tube steam boilers not in water tube boilers , as the shell diameter of the former is greater than that of latter irrespective of their running capacities and working pressures. For smoke tube boilers, mobrey is fitted externally on the nozzles coming out of the steam boiler shell curvature. It consists of a hollow cylindrical unit in which a float hangs. So, when the feed pump works, it supplies feed water to the boiler shell and it gets filled up. From those nozzles, the water also enters the hollow cylindrical pipe of the mobrey, as a result, the float goes up. Now during the operation of the Steam Boiler, the water gets heated up and gets converted to steam. Meanwhile, t...