Section 65(3)(iii) in Maharashtra Factories Rules, 1963
(iii)Every pressure plant or pressure vessel not constructed to withstand the maximum possible working pressure at the source of supply or the maximum pressure which can be obtained in the pipe connecting the pressure vessel with any other source of supply shall be fitted with a suitable reducing valve or other suitable automatic device to prevent the safe working pressure of the vessel being exceeded. Suitable pressure guages shall be provided close to the reducing valve to show the high pressure and reduced pressure.