Gate Valves Β· Non-Rising Stem Gate Valves
BS NRS Carbon Steel Gate Valves
BS NRS carbon steel gate valves are non-rising-stem (NRS) resilient-seated wedge gates built to BS 5163: the stem turns but does not rise, so the valve keeps the same installed height whether open or closed - the standard choice for buried water mains where headroom does not exist. The benchmark page covers DN50 to DN600 at PN16 to PN40, with a carbon steel body, an EPDM-encapsulated disc, and flanges to EN 1092.
Part of the Non-Rising Stem Gate Valves family
Last updated: 2026-11
Specifications
| size range | DN50 to DN600 |
|---|---|
| pressure class | PN16 to PN40 |
| body materials | Carbon Steel |
| body materials | Carbon Steel |
| disc materials | Carbon Steel + EPDM |
| seat materials | EPDM |
| stem materials | Stainless Steel, Inox |
| design standards | BS5163 |
| face to face | BS5163 |
| gasket materials | EPDM, Graphite |
| packing materials | EPDM (O-ring) |
| flange standards | EN1092 |
Application & selection guidance
Choose this execution for buried or space-constrained water and utility lines on BS/EN standards: NRS means no rising stem above the handwheel, so a key or extension spindle works in a valve chamber. The EPDM-sealed wedge suits clean water and neutral media; for hydrocarbons or high temperature the elastomer seat is the limit and a metal-seated wedge execution is the alternative. Note the benchmark page declares PN16 to PN40 only, and no actuation options are listed on the source page - confirm actuated variants at quotation.
Frequently asked questions
What does NRS (non-rising stem) mean, and when does it matter?
In an NRS gate valve the stem rotates in place and the wedge travels along it inside the body, so nothing rises above the bonnet as the valve opens. That keeps the installed height constant - essential for buried service, valve chambers and tight plant rooms. The trade-off is that the open position is not visible from outside; a rising-stem execution is preferred where visual position indication matters.
Resilient-seated vs metal-seated gate valve for water lines?
A resilient-seated wedge (EPDM encapsulation on this benchmark page) closes with low torque and achieves bubble-tight shutoff in clean water at PN16 to PN40, which covers most distribution mains. Metal-seated wedges tolerate dirty, abrasive or hot media better but need higher torque and do not always seal bubble-tight. Match the seat to the medium and temperature first.
What information is needed to quote a BS NRS carbon steel gate valve?
Nominal diameter (DN50 to DN600 on the benchmark page), pressure rating (PN16 to PN40), flange standard (EN 1092 on the benchmark page), the medium and temperature, and whether the installation is buried (spindle extensions, valve-box interface) or above ground. State any actuation requirement explicitly - the source page lists manual execution only, so actuated variants must be confirmed at quotation.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry β typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order β state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage β seat compounds age fastest in direct sunlight and freezing conditions.
Knowledge: selection guides
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