This document specifies constructional, functional, testing marking and sizing requirements and documentation of gas safety shut-off devices: — for inlet pressures up to 100 bar and nominal diameters up to DN 400; — for an operating temperature range from –20 °C to +60 °C; which operate with fuel gases of the 1st and 2nd family as defined in EN 437, used in the pressure regulating stations in accordance with EN 12186 or EN 12279, in transmission and distribution networks and also in commercial and industrial installations.