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Reg. 300, Reg. 301, Reg. 302, Reg. 303

Moving Parts

 
The valves and spindles shall be efficiently guided and means shall be provided in every case to prevent their lifting out of their guides. The working parts shall have sufficient clearance to ensure freedom of movement under all conditions of service. The spindle shall not be fitted with a stuffing box.



Reg. 301

Bearings for Levers

The bearings of the levers of lever valves shall be so designed as to allow of free working of the valve under all conditions of service. Where the lever is mounted on pin bearings, the holes in the lever shall be bushed with non-corridible metal, or the pins shall be of non-corrodible metal.



Reg. 302

Attachments of weights and Springs

a) In a lever and weight safety valve the weight shall be in one piece and attached to the lever in such a way that the safety valve cannot be overloaded.
b)

In the case of spring loaded safety valves, washers or ferrules shall be fitted under the adjusting screws so that the valves cannot be overloaded when under steam. Interference with load on the spring, after the safety valve has been adjusted, shall be prevented by the fitting of a ferrule under the adjusting screw collar or by using a lock nut on the adjusting screw which shall be further safeguarded by means of a padlock or other suitable device. Where springs are in tension, links or other suitable stops shall be fitted to prevent the spring being extended a greater amount than that corresponding to a valve lift of D/4.

where D=diameter of valve seating.



Reg. 303

Easing Gear

Safety valves shall be so arranged that they can be eased off their seats when under pressure and the easing lever shall positively lift the valve.
 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
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