British Standards Document
BS EN 16129
Pressure regulators, automatic change-over devices, having a maximum regulated pressure of 4 bar, with a maximum capacity of 150 kg/h, associated safety devices and adaptors for butane, propane, and their mixtures
https://doi.org/10.3403/30228057U
BS EN 16129 is maintained by GSE/24. The current release of this standard is:
BS EN 16129:2013 Pressure regulators, automatic change-over devices, having a maximum regulated pressure of 4 bar, with a maximum capacity of 150 kg/h, associated safety devices and adaptors for butane, propane, and their mixtures
https://doi.org/10.3403/30228057 (published 31/08/2013)
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Other historical versions of this standard document also exist: