(1)Valve fitted to gas cylinder shall comply in all respects with the following specifications, namely:-i. in respect of industrial gas cylinder and CNG on-board cylinder, IS:3224;ii. in respect of medical gas cylinder, IS:3745;iii. in respect of cylinder used with breathing apparatus, IS:7302 as amended from time to time;iv. in respect of cylinder used for filling liquefied petroleum gas, IS:8776 for cylinder of water capacity not exceeding five liters and, IS: 8737 for cylinder of water capacity exceeding five liters;v. in respect of auto LPG container IS:15100;vi. in respect of small refrigerant cylinder IS:12300vii. in respect of LPG regulators fitted to LPG cylinder, IS :9798 .viii. in respect of the valve fitted to the cryogenic container-Codes accepted by the Chief Controller.ix. in respect of valve conforming to other standard as approved by the Chief Controller:Provided that the Chief Controller may, if he is of opinion that it is necessary so to do in the public interest, permit the use of valves and LPG regulators not conforming to the specifications.(2)Valve fitted to Carbon Dioxide cylinder shall be provided in the body with a safety release consisting of softened copper disc so arranged as to burst at a pressure between 200 kg/cm2 and 220 kg/cm2.(3)Valve for cylinder containing flammable gases not listed in IS: 3224 shall have outlets provided with left handed screw threads for the pipes or other connections.(4)All other valves shall have outlets with right-handed screw threads.(5)The valve shall be attached to the cylinder neck by screwing and not by making any permanent attachment or inserting adapter in between.(6)The design of spindle-operated valve shall be such that when fitted to the cylinder, it shall not be possible to withdraw the spindle under normal operating conditions.
