Section 37 in The Static And Mobile Pressure Vessels (Unfired) Rules, 1981
37. Protection of valves and accessories .-(1) All valves and accessories shall be safeguarded against accidental damage or interference.
(2)Valves and accessories shall be mounted and protected in such a way that risk of accidental rupture of the branch to which the valve or accessory is connected is minimised.(3)Valves or accessories situated at the rear of a vehicle shall be protected by the rear cross member of the frame of the vehicle against damage and shall comply with sub-rule (2).
