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ČSN EN 14433 This document specifies the requirements for valves useable on tanks with a minimum working pressure greater than 50 kPa for the transport of dangerous goods by road and rail for the following functions: Tanks for transport of liquid products: - secondary closure of bottom discharge lines; - primary closure on top of the tank (liquid, air, other connections); - aeration valve on top of the tank; - and other valves as specified in Annex F of EN 14564:2019 according to the scope of this document. Tanks for gases: - secondary closure of bottom discharge lines; - secondary closure on top of the tank for poisonous gases: liquid phase and gas phase; - and other valves as specified in Annex F of EN 14564:2019. This includes the following types of closures: - valves (e.g. spindle operated valves, plug and ball valves, butterfly valves and gate valves); - dry disconnect couplings. Primary closures of the gas phase at the foot of a tank for liquefied gas are covered by the requirements of foot valves in EN 14433. NOTE - The standard is also applicable to liquefied gases including LPG, however, for a dedicated LPG standard see EN 13175 [3]