OS GSO BS 5163-2:2025
BS 5163-2:2004
Omani Standard
Current Edition
·
Approved on
14 October 2025
Valves for waterworks purposes - Part 2: Stem caps for use on isolating valves and associated water control apparatus -Specification
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OS GSO BS 5163-2:2025 Scope
Isolating valves and hydrants installed in underground pipelines primarily carrying water intended for human consumption within the United Kingdom are required to be fitted with a stem cap to enable them to be operated by a ring-key and bar or T-shaped key.
The stem cap is fitted to the top of the valve stem to convert the manufacturer’s stem configuration to mate with operating keys.
Two sizes of stem cap are specified, covering respectively, valves from DN 50 through DN 300 and DN 350 through DN 600.
NOTE Stem caps are also commonly used on other waterworks apparatus, e.g. penstocks (specified in BS 7775).
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