BS EN 13953:2020 pdf free.LPG equipment and accessories一Pressure relief valves for transportable refillable cylinders for Liquefied Petroleum Gas (LPG). BS EN 13953 Hot stamped brass shall be non-porous and shall be suitable for machining or other processes.Sand-cast brass shall not be used. Leaded brass shall be CW614N, in accordance with EN 12164, or CW617N in accordance with EN 12420 or...