API 6D / API 608 Metal-Seated Ball Valves - Low Platform
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API 6D / API 608 Metal-Seated Ball Valves - Low Platform
STELLITE METAL-TO-METAL · -29°C TO +425°C · SEVERE SERVICE
Severe-service ball valve with Stellite hard alloy metal-to
metal seating for high-temperature steam, abrasive slurries,
erosive particulate, and H₂S sour gas service. Three body
material options (WCB, CF8, CF8M) cover the full industrial
duty spectrum. API 598 Class IV reliable shutoff from -29°C to
+425°C — outperforms PTFE soft seat in conditions that cause rapid soft-seat degradation.
| API 6D / API 608 / ASME B16.34 | |
|---|---|
| Pressure | Class 150 / Class 300 |
| Size Range | NPS ½" – 8" (DN15 – DN200) |
| Body | WCB · CF8 · CF8M (316SS) |
| Seat | Stellite Hard Alloy HRC 38–45 |
Sales team responds within 24 hours
- 30+ yrs foundry
- 50,000 m² in-house casting
- Mill cert with every order
- 100% hydro-tested (API 598)
— Full Specifications
API 6D / API 608 Metal-Seated Ball Valves - Low Platform - Parameter Table
| PARAMETER | SPECIFICATION |
|---|---|
| Model | Q41Y-150LB-YT |
| Standard | API 6D / API 608 / ASME B16.34 |
| Size Range | NPS 1/2" – 8" (DN15 – DN200) |
| Body Material | WCB (ASTM A216) / CF8 (ASTM A351 304SS) / CF8M (316SS) |
| Ball Material | SS410 + Stellite Overlay / SS316 + Stellite Overlay (HRC 38–45) |
| Seat Material | Stellite Hard Alloy (Metal-to-Metal) |
| Stem Material | 17-4PH, XM-19 |
| Platform Type | Low Platform – ISO 5211 Stem Top / Bracket & Coupler Required |
| Fire Safe Design | API 607 / API 6FA Compliant |
| Double Block & Bleed | DBB Available on Request |
| Leakage Class | API 598 Class IV (Metal-to-Metal Sealing) |
| Temperature Range | -29°C ~ +425°C (Material Dependent) |
| Applicable Media | Crude Oil / Natural Gas / Steam / Abrasive / H2S Sour Service |
| Pressure Class | Class 150 / 300 |
| End Connection | Flanged RF / RTJ |
| Anti-Static | API 6D |
| Test Standard | API 598 / API 6D |
Our Production Process
1. Casting
2. Machining
3. Testing
4. Loading
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· Product documentation
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This Product Spec Sheet
Single-page datasheet for API 6D / API 608 Metal-Seated Ball
Valve – Low Platform
- Full parameter table
- Dimensional drawing
- Materials & standards list
- Ordering code guide
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— WHY bAUTU
Why Specify This Valve from Bautu
Stellite Trim — Survives Where PTFE Fails
HRC 38–45 cobalt-chromium overlay resists wire-drawing, particle erosion, and thermal deformation. Maintains Class IV shutoff under high-differential-pressure throttling and abrasive slurry duty
Full Material Range + DBB Option
WCB to CF8M body × Full Bore/Reduced Bore × Optional Double Block & Bleed cavity bleed configuration — single product family covers severe-service procurement specs for offshore, refinery, and pipeline EPC.
— FAQ
Frequently Asked Questions
What does "metal seated" mean, and when is it preferred over soft seated?
Metal seated means both the ball and seat ring are made from hardened metal rather than polymer (PTFE/RPTFE). Metal seated valves meet API 6D Class IV leakage rate (≤100 ml/min per inch of bore) and withstand service temperatures from -29°C to +425°C on standard carbon steel bodies, with alloy steel options extending to +600°C, abrasive media, erosive fluids, and high-velocity steam that would quickly damage soft seats. They are the preferred choice for high-temperature process lines, steam service, catalyst-laden flows, and fire-safe critical applications where soft seats cannot survive.
What is Stellite, and why is it used on this valve?
Stellite is a cobalt-chromium alloy renowned for exceptional hardness, corrosion resistance, and wear resistance at elevated temperatures. Applied as a hard-facing overlay on the ball and seat surfaces, Stellite dramatically extends valve service life in abrasive, erosive, or high-temperature service. It resists galling — the tendency of metal-to-metal surfaces to seize under pressure — and maintains sealing integrity through repeated thermal cycling. Bautu applies Stellite overlay by precision welding to meet API 6D and API 608 requirements.
What is the lead time, and can you accommodate custom specifications?
Standard sizes (NPS ½" to 8", Class 150 / 300) with Stellite overlay are available in 4–6 weeks. Custom alloys, tungsten carbide overlay, actuated packages, or witness inspection orders typically require 8–12 weeks. OEM private labeling and ITP documentation are available for EPC projects. Contact our team for a formal quotation.
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