FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 16. Main stop valve.
(1) Every steam boiler main stop valve shall be fitted direct to its pad on the steam boiler shell
except where a superheater forms an integral part of the steam boiler or where for the purpose of
drainage it is necessary to interpose a stand pipe between the pad and the stop valve, in which
case such stand pipe shall have a height not greater than five times its diameter.
(2) Where two or more steam boilers are connected to a common steam pipe every main stop
valve shall be of the non-return or self-closing type unless a self-closing valve is interposed
between each main stop valve and such common steam pipe.
(3) Every main stop valve shall bear the manufacturer's or maker's name, its design pressure and
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