Boiler Mountings:
Boiler Mountings are the fittings, which are mounted or installed on the boiler for its safe and proper functioning. There are many boiler mountings which are mounted on the boiler. Blow off cock is one of the boiler mountings. Below shows the functions, position, constructions & working principle of a blow off cock in a boiler.
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| Blow off cock |
Functions of blow off cock:
The function of blow-off cock is
➠ To discharge mud and
other sediments deposited in the bottom most part of the water space in the boiler, while
boiler is in operation. ➠ To drain-off boiler water.
Locations of blow off cock:
➠ It is mounted at
the lowest part of the boiler.
➠ When it is open,
water under the pressure rushes out, thus carrying sediments and mud.
Constructions of blow off cock:
➠ It is fitted on the boiler shell directly or through the
short branch of pipe at lowest part of the water space.
➠ It consists of gun
metal conical plug having a rectangular hole, spindle with yoke a shown in fig.
➠ The plug meshes accurately into the similar casing.
➠ The plug spindle is
generally rotated by mean of spanner on the top of the yoke, two vertical slots
are provided for fixing spanner.
Operation Principle of blow off cock:
➠ When rectangular hole of plug is brought in line with
casing hole by rotating spindle, the water flow out.
➠ When the solid portion of
the plug is in front of casing hole the water
cannot flow out of boiler.
See More Related Boiler Mountings:
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