Metal-seated ball valve · Made in Wenzhou
API 608 Metal-Seated Ball Valve — Lever Operated
Flanged floating ball valve with a hardfaced ball and metal seats instead of PTFE, for lines up to +420 °C or media with particles that would wear out a soft seat. Opened and closed by a quarter-turn hand lever; graphite gasket and packing.
- Hardfaced ball and seats for hot media and media with solid particles
- Every valve shell and seat tested per API 598, test report in every shipment
- Standard sizes ship in 15–20 days
An engineer replies within 24 hours. Send size, class, material and quantity. Download GA drawing (PDF) →
Specifications
Technical Data
| Design standard | API 608 / ASME B16.34 |
| Face-to-face | ASME B16.10 |
| Flanges | ASME B16.5, raised face |
| Size range | NPS ½″–8″ (DN15–DN200) |
| Pressure class | Class 150 / Class 300 |
| Body material | WCB (A216) · CF8 (A351) · CF3M (A351) |
| Ball and seats | Stainless steel (F304 / F316L), hardfaced to suit the service: hard chrome plating (HCr), nickel alloy (Ni55 / Ni60), tungsten carbide (WC) or Stellite (STL) |
| Temperature | −29 °C to +420 °C (limited by body material and pressure) |
| Gasket and packing | Spiral-wound gasket, flexible graphite packing |
| Construction | Two-piece body, floating ball |
| Top flange | Drilled to ISO 5211 (F05–F14), see dimension table |
| Operation | Quarter-turn hand lever; actuator with bracket and coupling |
| Media | Water, oil and gas |
| Testing | API 598 — every valve |
| Fire test | API 607 certification in application |
Application
Where It Is Used
Choose metal seats when the temperature or the media would damage a PTFE seat. Below +150 °C with clean media, a soft-seated valve seals tighter and costs less.
- Hot oil and thermal oil lines
- High-temperature water and gas lines
- Media carrying particles or scale that would cut a PTFE seat
- Chemical lines (CF3M body)
ASSEMBLY HALL · WENZHOUConstruction
Parts & Materials
From our Q41Y Class 150 and Class 300 general assembly drawings. Ni55 / Ni60 = nickel-base alloy, WC = tungsten carbide, STL = Stellite; the hardfacing is chosen to suit the service. Hard chrome plating (HCr) is also available; the hardfacing is selected to order.
| Part | WCB body | CF8 body | CF3M body |
|---|---|---|---|
| Body / Bonnet | A216 WCB | A351 CF8 | A351 CF3M |
| Ball | A182 F304 + Ni60 / WC / STL | A182 F304 + Ni60 / WC / STL | A182 F316L + Ni60 / WC / STL |
| Seat | A182 F304 + Ni55 / WC / STL | A182 F304 + Ni55 / WC / STL | A182 F316L + Ni55 / WC / STL |
| Stem | 17-4PH | A182 F304 | A182 F316L |
| Disc springs | 17-7PH | 17-7PH | 17-7PH |
| Support ring | A276 304 | A276 304 | A276 316L |
| Body gasket | Spiral wound, SS304 + graphite | Spiral wound, SS304 + graphite | Spiral wound, SS316L + graphite |
| Seal ring / Stem packing | Flexible graphite | Flexible graphite | Flexible graphite |
| Gland | A351 CF8 | A351 CF8 | A351 CF3M |
| Studs / Nuts | A193 B7 / A194 2H | A193 B8 / A194 8 | A193 B8 / A194 8 |
| Lever | A216 WCB | A216 WCB | A216 WCB |
Dimensions
Dimensions (mm)
Class 150 — flange and length
| NPS | DN | L | D | D1 | D2 | T | f | n-Ød |
|---|---|---|---|---|---|---|---|---|
| ½″ | DN15 | 108 | 90 | 60.3 | 35.1 | 11.6 | 2 | 4-Ø16 |
| ¾″ | DN20 | 117 | 100 | 69.9 | 42.9 | 13.2 | 2 | 4-Ø16 |
| 1″ | DN25 | 127 | 110 | 79.4 | 50.8 | 14.7 | 2 | 4-Ø16 |
| 1¼″ | DN32 | 140 | 115 | 88.9 | 63.5 | 16.3 | 2 | 4-Ø16 |
| 1½″ | DN40 | 165 | 125 | 98.4 | 73.2 | 17.9 | 2 | 4-Ø16 |
| 2″ | DN50 | 178 | 150 | 120.7 | 91.9 | 19.5 | 2 | 4-Ø19 |
| 2½″ | DN65 | 190 | 180 | 139.7 | 105 | 22.7 | 2 | 4-Ø19 |
| 3″ | DN80 | 203 | 190 | 152.4 | 127 | 24.3 | 2 | 4-Ø19 |
| 4″ | DN100 | 229 | 230 | 190.5 | 157 | 24.3 | 2 | 8-Ø19 |
| 5″ | DN125 | 356 | 255 | 215.9 | 186 | 24.3 | 2 | 8-Ø22 |
| 6″ | DN150 | 394 | 280 | 241.3 | 216 | 25.9 | 2 | 8-Ø22 |
| 8″ | DN200 | 457 | 345 | 298.5 | 270 | 29 | 2 | 8-Ø22 |
Class 300 — flange and length
| NPS | DN | L | D | D1 | D2 | T | f | n-Ød |
|---|---|---|---|---|---|---|---|---|
| ½″ | DN15 | 140 | 95 | 66.7 | 35.1 | 14.7 | 2 | 4-Ø16 |
| ¾″ | DN20 | 152 | 115 | 82.6 | 42.9 | 16.3 | 2 | 4-Ø18 |
| 1″ | DN25 | 165 | 125 | 88.9 | 50.8 | 17.9 | 2 | 4-Ø18 |
| 1¼″ | DN32 | 178 | 135 | 98.4 | 63.5 | 19.5 | 2 | 4-Ø18 |
| 1½″ | DN40 | 190 | 155 | 114.3 | 73.2 | 21.1 | 2 | 4-Ø22 |
| 2″ | DN50 | 216 | 165 | 127 | 91.9 | 22.7 | 2 | 8-Ø18 |
| 2½″ | DN65 | 241 | 190 | 149.2 | 105 | 25.9 | 2 | 8-Ø22 |
| 3″ | DN80 | 282 | 210 | 168.3 | 127 | 29 | 2 | 8-Ø22 |
| 4″ | DN100 | 305 | 255 | 200 | 157 | 32.2 | 2 | 8-Ø22 |
| 5″ | DN125 | 381 | 280 | 235 | 186 | 35.4 | 2 | 8-Ø22 |
| 6″ | DN150 | 403 | 320 | 269.9 | 216 | 37 | 2 | 12-Ø22 |
| 8″ | DN200 | 502 | 380 | 330.2 | 270 | 41.7 | 2 | 12-Ø26 |
Top works — Class 150 and 300
| NPS | DN | Stem F × ØY | Top flange ØE / ISO 5211 | Top flange bolts | Lever M |
|---|---|---|---|---|---|
| ½″ | DN15 | 9×Ø14 | 50 / F05 | 4-M6 | 160 |
| ¾″ | DN20 | 9×Ø14 | 50 / F05 | 4-M6 | 160 |
| 1″ | DN25 | 10×Ø16 | 50 / F05 | 4-M6 | 180 |
| 1¼″ | DN32 | 10×Ø16 | 50 / F05 | 4-M6 | 180 |
| 1½″ | DN40 | 14×Ø20 | 70 / F07 | 4-M8 | 230 |
| 2″ | DN50 | 14×Ø20 | 70 / F07 | 4-M8 | 230 |
| 2½″ | DN65 | 16×Ø24 | 90 / F09 | 4-M10 | 270 |
| 3″ | DN80 | 17×Ø26 | 90 / F09 | 4-M10 | 310 |
| 4″ | DN100 | 17×Ø26 | 90 / F09 | 4-M10 | 310 |
| 5″ | DN125 | 21×Ø32 | 102 / F10 | 4-M10 | 600 |
| 6″ | DN150 | 24×Ø36 | 125 / F12 | 4-M12 | 700 |
| 8″ | DN200 | 27×Ø40 | 140 / F14 | 4-M16 | 800 |
L = face-to-face (ASME B16.10) · D = flange O.D. · D1 = bolt circle · D2 = raised face O.D. · T = flange thickness · f = raised face height · n-Ød = bolt holes · Stem F × ØY = stem flats × stem diameter · ØE = top flange bolt circle · M = lever length. Flanges to ASME B16.5.
FACE-TO-FACE CHECK
QC TAG ON EVERY VALVEChecked before packing
Face-to-face and flange dimensions are checked with calipers against ASME B16.10 and B16.5 before packing. Each valve gets a QC tag with model, size, class and inspector.
Pressure rating
Max. Working Pressure at 38 °C
| Body material | Class 150 (bar) | Class 300 (bar) |
|---|---|---|
| WCB (Group 1.1) | 19.6 | 51.1 |
| CF8 (Group 2.1) | 19.0 | 49.6 |
| CF3M (Group 2.3) | 15.9 | 41.4 |
Body ratings per ASME B16.34. The allowed pressure falls as the temperature rises; send us the design pressure and temperature and we confirm the class.
Testing
API 598 Test on Every Valve
| Test | Pressure |
|---|---|
| Shell test (water) | Class 150: 3.0 MPa · Class 300: 7.5 MPa |
| Seat test (water) | Class 150: 2.2 MPa · Class 300: 5.5 MPa |
| Seat test (air) | 0.6 MPa |
Test pressures from our Q41Y GA drawings. Seat leakage is held within the API 598 limits for metal-seated valves; actual values for each valve are on the test report.
MATERIAL CHECK · SPECTROMETERQuality records
Mill Test Certificate (EN 10204 3.1) in Every Shipment
- Heat number of the body casting
- Chemical composition against ASTM limits
- Mechanical properties: tensile, yield, elongation
- Shell and seat test pressure and hold time per API 598
- Signed and stamped by our QC department
SAMPLE MTC · EN 10204 3.1 · CLICK TO OPEN
We welcome third-party inspection (e.g. SGS or BV), arranged and paid for by the buyer; inspectors get full access to our plant and test bench.
Download Sample MTC (PDF)How to order
Model Code Q41Y-150LBC
No “G” in front of the code means the standard (low) top flange; G marks our high-platform valves. The model code is printed on the nameplate and the QC tag.
Send us these 8 details for a fast quote
- Size (NPS or DN)
- Pressure class (150 / 300)
- Body material (WCB / CF8 / CF3M)
- Media, with any solids or particles
- Operating temperature and pressure
- Lever, or actuator type
- Quantity
- Destination port
Made in one plant
From Machining to Crate in Wenzhou
01 MACHINING
02 DRILLING
03 ASSEMBLY
04 PRESSURE TESTSee the valve before you order
Real footage from our ball valve line. Want to see your own order? Book a live video call and we show your valves on the test bench.
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CRATED AT OUR PLANTPacking & delivery
Packed for Sea Freight
- Flange faces capped to protect the sealing face
- Each valve bagged; the order packed in plywood cases
- Product test report inside every case
- Standard sizes ship in 15–20 days
FAQ
Frequently Asked Questions
When should I choose a metal-seated ball valve instead of a soft-seated one?
When the line runs hotter than a PTFE seat can take (+150 °C, or +180 °C with RPTFE), or when the media carries particles, scale or crystals that would cut a soft seat. For clean media at lower temperatures, a soft-seated valve such as our API 608 manual ball valve seals tighter and costs less.
Which hardfacing: nickel alloy, tungsten carbide or Stellite?
All three are hard coatings on the ball and seat faces. Nickel alloy suits general hot service, tungsten carbide resists heavy abrasion, and Stellite keeps its hardness at high temperature. Tell us the media, temperature and pressure and we choose the hardfacing with you; it is stated on the order confirmation.
Does a metal-seated ball valve seal as tight as a soft-seated one?
Every valve is seat-tested per API 598. For metal-seated valves above NPS 2, API 598 allows a small, specified leakage rate, while soft seats must show no visible leakage. If you need zero leakage, tell us the conditions and we review the options with you.
Can I fit an actuator?
Yes. The top flange is drilled to ISO 5211 (sizes in the dimension table), and we supply the bracket and coupling for your actuator. Send us the actuator make and model with your enquiry.
Which body material should I choose: WCB, CF8 or CF3M?
WCB carbon steel for non-corrosive water, oil and gas. CF8 (cast 304) for general corrosion resistance. CF3M (cast 316L) for chlorides, seawater and chemical service.
What documents ship with the valve?
A product test report with the heat number of the body casting, chemical composition, mechanical properties and the pressure test results. We welcome third-party inspection (e.g. SGS or BV), arranged and paid for by the buyer.
What is the lead time?
Standard sizes ship in 15–20 days from stock. Special materials or options may take longer; we confirm the delivery date with your quote.
Is the valve fire-safe or API certified?
It is designed and built to API 608 and ASME B16.34, and every valve is pressure-tested per API 598. We do not hold an API Monogram licence. API 607 fire-type testing and ISO 9001 are in application, so the valve is not yet fire-safe certified. Every order ships with a Product Test Report (heat number, chemistry, mechanical properties and API 598 test results). Third-party inspection (e.g. SGS or BV) is welcome, arranged by the buyer.
Buyer's guide
API 608 Ball Valves: What the Standard Covers and How to Specify OneSizes and pressure classes under API 608, API 608 vs API 6D, and an 8-point checklist for your enquiry.Read the guide →
Soft-Seated vs Metal-Seated Ball Valves: How to ChoosePTFE to +150 °C, RPTFE to +180 °C, metal seats to +420 °C — when a metal seat is worth the extra torque and cost.Read the guide →Related
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