BED

 

CRICKET BAT

 

HAMMER

 

PLIER

 

GUITAR

 

FIGHTER JET

 

TYRE ASSEMBLY

 

KNIFE

 

Sliding Conveyor

 

Bucket Elevator G.A. Drawing

 

Rotary Air Lock Valve

 

STEAM ENGINE CROSS HEAD

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C CLAMP

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FEW RANDOM DIFFICULT DRAWINGS

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CLAPPER BLOCK

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BLOW OFF COCK

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BLOW OFF COCK

Function:

       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. 

Location:

          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. 

Construction:

          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:

          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.