Specifying fire protection valves looks straightforward until the first commissioning failure. A landing valve that mated perfectly with a fire service hose on the drawing still has to open under full system pressure, drain down without leaving a charged pipe run, survive a decade of standing idle in a shaft, and — on a wet riser — do that without compromising the building's potable water supply.
This guide covers what BS 5041 and EN 671 actually require, the clauses that decide whether valves pass commissioning, and the procurement checks that protect a programme.
The terminology is used loosely in the trade, and that causes real specification errors. Three distinct products are usually in play:
BS 9990 is the installation code of practice that ties the risers together; BS 5306-1 covers hose reels and foam inlets.
BS 5041 is a multi-part British Standard for fire hydrant systems equipment. Part 1 specifies landing valves for wet risers; Part 2 specifies landing valves for dry risers; Part 3 covers inlet breechings for dry riser inlets. It defines the valve pattern — normally a copper alloy or gunmetal body — the outlet coupling geometry, the working pressure class, and the requirement that the valve be reliably operable under pressure by a firefighter wearing gloves.
Where it stops matters just as much. BS 5041 does not approve a factory, certify a batch or sanction an installation; it sets a product pattern. The specifier must still confirm the pattern is met, the coupling mates, and the installed system achieves the design flow and residual pressure at the most remote landing valve — confirmed against BS 9990 and the building's fire strategy.
The most common import defect sits at the coupling. The outlet must mate with instantaneous couplings to BS 336. A valve can be dimensionally close and still fail, because "2.5 inch" is not a specification. Write the standard, not the nominal size.
**Pattern orientation.** Oblique valves keep the hose run clear of the cabinet and reduce kinking during deployment; straight valves suit tighter shafts. Neither is better, but the choice must match the cabinet and deployment path.
**Gland and stem.** A serviceable, adjustable gland lets the valve be re-packed in situ. Valves with sealed, non-serviceable stems get replaced rather than maintained, which is costly in an occupied building.
**Drain and bleed provision.** On a wet riser, being able to drain a valve body and the pipe section above it is what allows maintenance without draining the whole riser.
**Flow path and seat.** Bore diameter and seat geometry drive pressure drop, and matter most on systems with marginal residual pressure. Restricted bodies can pass a works test and fail a hydraulic check.
Wet risers are usually charged from the potable mains or a dedicated break tank. In the UK, the Water Supply (Water Fittings) Regulations 1999 apply, and Regulation 4 requires materials in contact with water not to contaminate the supply. In practice, valves and any flexible connections should hold WRAS approval, with non-metallic components tested to BS 6920.
That is not paperwork for its own sake. An unapproved elastomer or an inadequately stabilised brass can hold up sign-off for an entire building, and rectifying it inside a live riser shaft costs far more than specifying an approved valve on day one.
One clause resolves most hose reel confusion: do not specify "a valve to EN 671". EN 671-1 evaluates the **whole assembly** — reel, semi-rigid hose, nozzle and valve together — against criteria including jet reach, flow and operating force. A hose reel valve is therefore specified as part of a claimed, tested assembly, and the certificate should name the complete product, not a component. Typical UK assemblies use a DN25 connection with 30 m of 19 mm or 25 mm hose, but the duty follows the fire strategy.
Write these clauses into the schedule and most downstream arguments disappear:
Pattern and pressure class — BS 5041-1 or -2, oblique or straight, DN65, PN16.
Outlet coupling — instantaneous to BS 336, with gasket and cap arrangement stated.
Body material — copper alloy or gunmetal; DZR grade where the shaft is damp.
Approval — WRAS listing naming the specific product reference; BS 6920 data for elastomers.
Seals and washers — material and maximum continuous temperature and pressure, stated separately from the valve rating.
Gland — adjustable and field-serviceable, with spare packing specified.
Drain plug or bleed screw supplied as standard on wet riser valves.
Handwheel — material, diameter, opening direction, and operation by a gloved hand under pressure.
Certification — works hydrostatic test certificate per valve, material certificates to EN 10204 3.1, and a Declaration of Performance where applicable.
Marking — manufacturer identity, size, pressure class and flow direction permanently marked, plus batch or heat number.
Before the order is placed, ask for the pattern drawing and verify it against BS 5041 before freight is committed. Ask which part and clause the valve was type-tested against, and request the test report rather than a marketing summary. Confirm the actual DN, thread form and coupling geometry, and ask how long spare seats, glands and handwheels will remain available — ten years is reasonable.
When valves fail a few years later it is usually for the same four reasons: stems seized because the valve was never operated, gland leaks on valves never re-packed, elastomers hardened in an environment the datasheet never covered, and drain plugs lost on a maintenance visit. Specify for maintenance, not only installation.
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**About the author — Zhejiang Xindong Sanitary Ware Co., Ltd.**
Zhejiang Xindong Sanitary Ware Co., Ltd. manufactures and exports brass valves, tapware and sanitary fittings from Yuhuan, Zhejiang, where it has operated since 2006. It supplies building-services customers across the UK, Europe, North America and Japan, holds WRAS approval on parts of its range, and supports OEM and ODM valve programmes with pattern drawings and third-party test reports.
Enquiries: [email protected] | +86-0576-87499008 | https://www.cn-xindong.com
*Engineering guidance for specifiers; it does not replace the applicable standards, the fire strategy or the project specification.*
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The company, founded in 1999 and located in Yuhuan,specializes in taps, thermostatic shower valves and shower kits. With over 30,000 sqm of space and 380+ employees, we hold numerous certifications and 65+ patents.
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