Non-Rising Stem (NRS) Gate Valve – Bronze Trim, Key Adapter Operated
Description
Technical Data Sheet
Product: Non-Rising Stem (NRS) Gate Valve – Bronze Trim, Key Adapter Operated
Typical Standard: AWWA C500 / C515 (Resilient or Metal-Seated)
1. General Description
This valve is a non-rising stem (NRS), flanged or mechanical-joint gate valve specifically designed for buried service in potable water, raw water, sewage, and fire protection systems. The stem does not rise during operation, making it ideal for installations with limited vertical space. The valve trim (stem, disc facing, seat rings) is manufactured in bronze to ensure corrosion resistance and long service life. Operation is achieved via a key adapter (2-inch square operating nut) mounted on top of the stem, allowing actuation with a standard T-key or valve key from grade level. A surface box or extension spindle can be provided upon request.
2. Design, Manufacturing & Inspection Standards
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Design & Manufacture: AWWA C500 (Metal-Seated Gate Valves) or AWWA C515 (Resilient-Seated Gate Valves) for waterworks service.
For Fire Protection: UL 246 / FM 1120 (Hydrant/Gate Valves). -
Pressure Rating: Class 125 (200 psi WOG) or PN10 / PN16 (Typical: PN16)
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Flange Connection: ASME B16.1 Class 125 (Cast Iron) or ASME B16.5 Class 150 (Steel); EN 1092-2 PN16 (optional)
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Face-to-Face: AWWA C500 / C515 Short Pattern or Long Pattern (as specified)
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Inspection & Testing: AWWA C500/C515, API 598 (shell & seat tightness)
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Coating: AWWA C550 (Interior/Exterior Fusion-Bonded Epoxy) or equivalent
3. Technical Parameters
| Parameter | Description |
|---|---|
| Nominal Size | DN80 – DN1200 (3″ – 48″) |
| Pressure Class | PN10, PN16 or Class 125 |
| Body Material | Ductile Iron ASTM A536 65-45-12 (standard) / Cast Iron ASTM A126 Class B |
| Bonnet Material | Ductile Iron or Cast Iron (matching body) |
| Trim Material | Bronze (C84400 / C83600 / B62) – Stem, Disc, Seat Rings |
| Disc Type | Solid wedge, fully bronze-faced or full bronze |
| Seat Rings | Renewable bronze, threaded into body |
| Stem Type | Non-Rising Stem (NRS), Bronze ASTM B62 / B584 |
| Packing | PTFE impregnated synthetic fiber / Graphite (adjustable gland) |
| Gland / Gland Flange | Bronze or Ductile Iron with bronze bushing |
| Gasket | EPDM or Nitrile (NBR) |
| Key Adapter / Operating Nut | Ductile Iron, 2″ (50.8 mm) square opening, to AWWA standard (other sizes available) |
| Operation | By manual T-key, valve key, or geared actuator with extension stem (optional) |
| Direction of Closure | Clockwise to close (standard) |
| Coating | Fusion-Bonded Epoxy (FBE) ≥ 250 microns, internally and externally |
| Suitable Media | Water, sewage, neutral liquids (check compatibility with bronze) |
| Temperature Range | -10°C to +82°C (14°F to 180°F) continuous |
4. Materials of Main Parts
| No. | Part Name | Material |
|---|---|---|
| 1 | Body | ASTM A536 65-45-12 Ductile Iron |
| 2 | Bonnet | ASTM A536 65-45-12 Ductile Iron |
| 3 | Wedge (Disc) | ASTM B584 C84400 Bronze (or C83600) |
| 4 | Seat Ring | ASTM B62 Bronze |
| 5 | Stem (NRS) | ASTM B584 C84400 / B62 Bronze |
| 6 | Stem Nut | ASTM B584 C93200 Bronze (integrated in wedge) |
| 7 | Packing | PTFE / Graphite |
| 8 | Gland | ASTM B584 Bronze |
| 9 | Bonnet Gasket | EPDM (WRAS approved) |
| 10 | Key Adapter / Operating Nut | Ductile Iron, 2″ Square |
| 11 | Bolts & Nuts | Stainless Steel SS304 (Standard) or Plated Carbon Steel |
5. Main Dimensions and Weights (Flanged PN16, Short Pattern)
| Nominal Size DN | Size (in) | Face-to-Face L (mm) | Approx. Height H (mm) (Open, incl. key adapter) | Approx. Weight (kg) |
|---|---|---|---|---|
| 100 | 4 | 229 | 380 | 28 |
| 150 | 6 | 267 | 460 | 45 |
| 200 | 8 | 292 | 540 | 70 |
| 250 | 10 | 330 | 625 | 105 |
| 300 | 12 | 356 | 710 | 150 |
| 350 | 14 | 381 | 790 | 210 |
| 400 | 16 | 406 | 870 | 280 |
| 500 | 20 | 457 | 1020 | 430 |
| 600 | 24 | 508 | 1170 | 620 |
Note: Dimensions are typical for flanged PN16 short-pattern valves with standard key adapter head. For extension spindles or gearboxes, height will vary. Final certified drawings prevail.
6. Pressure-Temperature Ratings (Ductile Iron Body, Bronze Trim)
| Temperature (°C) | Maximum Working Pressure (bar) |
|---|---|
| -10 to 38 | 16.0 (PN16) / 13.8 (Class 125) |
| 50 | 15.2 |
| 82 | 13.4 |
Test Pressures (ambient temperature)
Shell Test: 1.5 × CWP → 24.0 bar (PN16)
Seat Test: 1.1 × CWP → 17.6 bar (PN16)
7. Installation & Maintenance Notes
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Install in a horizontal or vertical pipeline with the stem pointing upward. Avoid inverted installation.
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For buried service, use a valve box or surface box to protect the key adapter and ensure the operating nut is accessible from grade with a standard T-key.
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When backfilling, ensure no side load is transmitted to the valve; thrust blocks should be installed as required.
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Regularly exercise the valve (fully open/close) once per year to prevent seizing.
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The packing gland can be re-tightened while the valve is in service. Replace packing if leakage persists.
8. Ordering Information
Please specify the following when ordering:
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Nominal size and pressure class (e.g., DN200 PN16)
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Body & bonnet material (Ductile Iron or Cast Iron)
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Trim material (Bronze – C84400 / C83600)
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Connection type: Flanged (specify standard), Mechanical Joint (MJ), or Push-on
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Key adapter size (standard 2″ square or other)
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Direction of closure (clockwise close standard)
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Extension spindle or valve box required? (Length from pipe center to grade)
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Special coating requirements (e.g., WRAS-approved epoxy)
Let me know if you need a version for fire-protection (UL/FM), a specific size table, or the data sheet adapted to a different standard such as BS 5163.
