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Regulation 57. Stop valves.



P.U.(A) 5/70
FACTORIES AND MACHINERY (STEAM BOILER AND
                   UNFIRED PRESSURE VESSEL)
                             REGULATIONS, 1970
            PART III - UNFIRED PRESSURE VESSELS

Regulation 57. Stop valves.
(1) Every stop valve for a steam receiver shall comply with the provisions of these regulations
relating to main stop valves for steam boilers.

(2) A stop valve or cock shall not be fitted between any unfired pressure vessel shall and its
safety valve or rupture disc.

(3) A stop valve or cock shall not be fitted between any safety valve or rupture disc and its
discharge pipe.

(4) Where a stop valve is placed in the discharge line between a compressor and an air receiver,
a relief valve shall be placed between the compressor and the stop valve unless the compressor
is provided with an automatic unloading device.



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