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Reg. 313, Reg. 314, Reg. 315, Reg. 316

Spacing of Coils

 
The space between the coils when the valve is lifted 1/4th of its diameter, shall be not less than 1.6 mm (1/16 inch) for full lift valves and 0.8 mm (1/32 inch) for ordinary and high lift valves."


Reg. 314

Finishing of Ends

Compression springs shall have their ends ground flat and smooth and at right angles to the axis of the springs over the full circumference so that when placed on end on a horizontal plane the springs will stand perpendicular.


Reg. 315
STOP VALVES

Lever Valves

Where the valve is operated by means of a lever, whether hand or mechanically controlled, the lever shall be of ample strength and the bearings shall be so designed as to allow of free working of the valve under all conditions of service.



Reg. 316

Steam Stop Valve

a) The stop valve connecting the boiler or supper heater to the steam-delivery pipe shall be located as near the out-let from the final super-heater header as is convenient and practicable or in case of boilers without super-heaters as close as practicable to the drum, where two or more boilers are connected with a steam receiver or any other vessel, a steam stop valve shall be fitted between the boiler and such receiver or Vessel.
b) Steam stop valves shall be attached direct to the boiler shell or to suitable pads or stand blocks and the neck or the valve chest shall be reasonably short and of strong construction. The steam stop valve may also be attached to a stand pipe, a connecting pipe or the superheater header. The attachment may be made by bolted flanges or butt-welded joints. Such butt-welded joints shall be suitably stress relieved, where necessary:

Provided that in the case of a larger boiler in which it is proposed for the purpose of drainage or owing to obstruction, to connect the steam-pipes to the steam stop valve at a higher level than would be obtained under this Regulation, a vertical stand pipe not exceeding 5 diameters in height will be permitted between the step valve and the boiler. Such stand pipes shall be of strong construction and of wrought iron, mild steel, or cast steel. The flanges of wrought iron or mild steel, or cast steel. The flanges of wrought iron or mild steel pipes shall be riveted or welded to the pipes, and there shall be no branch on the stand pipe for any other connection:

Provided also that in the case of large boiler in which it is desired to fit a tee piece for the purpose of providing a branch connection between the stop valve and the boiler, such a tee piece may be so fitted. The tee piece shall be of strong construction, of wrought iron, mild steel, or cast steel and shall not exceed 2½ diameters in height. A stop valve shall be fitted direct to each tee piece branch.
c) Deleted
d) when two or more boilers are connected to a common steam main and there are no combined stop and isolating valves fitted to them, an automatic isolating valve shall be compulsory. In the case of boilers fitted with welded pipes, fitting of an independent automatic isolating valve shall be compulsory.
 
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