Forged Metal-Seated
Ball Valves
Up to 350°C | API 6D Certified | ISO 5208 Rate B
Engineered for severe service applications where soft-seated valves fail — high temperature, abrasive media, frequent cyclic operation.
Why Metal-Seated?
Soft-seated ball valves are limited to 200°C. When your application demands higher temperatures, or involves abrasive particles, frequent cycling, or erosive media — you need metal-seated technology.
CARILO forged metal-seated ball valves deliver precision sealing at temperatures up to 350°C with hard-faced and matched lapped metal sealing pairs.
Designed per API 6D, they outperform soft-seated valves in severe service environments across oil & gas, petrochemical, refining, and power generation.
| Specification | Metal-Seated | Soft-Seated |
|---|---|---|
| Max Temperature | 350°C | 200°C |
| Sealing Standard | ISO 5208 Rate B | ISO 5208 Rate A |
| Abrasive Media | Resistant | Not Suitable |
| Frequent Cycling | Excellent | Limited |
| Pressure Range | 150~2500LB | 150~2500LB |
Engineered for Severe Service
Anti-Static Device
Eliminates electrostatic ignition risk per API 6D requirements. Essential for flammable fluid service.
Anti-Blowout Stem
Stem design prevents medium blowout, protecting operators and equipment in high-pressure systems.
Bi-Directional Shut-Off
Precision sealing in both flow directions. ISO 5208 Rate B industrial shut-off grade.
Low Fugitive Emission
Optional stem packing meets ISO15848-2 CLASS A low-leakage requirements for environmental compliance.
Hard-Faced Metal Sealing
Precision hard-faced and matched lapped metal sealing pairs — seals do not fail under high temperature or erosion.
High-Temp Resistance
Reliable operation from -29°C to 350°C. Engineered for steam, hot oil, and high-temperature process lines.
Low Pressure Drop
Full bore straight-through flow path minimizes pressure loss across the valve, reducing pumping costs.
Compact Forged Structure
2-piece and 3-piece bolted forged body design — rigid, lightweight, and easier to maintain than cast alternatives.
350°C — Where Metal-Seated Wins
Soft-seated valves rely on polymer seals that degrade above 200°C. Beyond that threshold, metal-to-metal sealing is the only reliable solution.
CARILO metal-seated valves use precision-engineered metal sealing pairs that maintain integrity at temperatures up to 350°C — without softening, degrading, or losing seal preload.
Common applications: steam distribution lines, hot oil transfer systems, refinery furnace gas, thermal oil heaters, and boiler feedwater circuits.
Full Bore & Reduced Bore
Choose the bore configuration that matches your flow requirements. Both designs maintain API 6D and ISO 5208 compliance.
Full Bore
Internal diameter matches pipeline bore. Zero restriction — ideal for pigging, line cleaning, and maximum flow capacity applications.
Reduced Bore
Smaller internal bore than pipeline. Lower cost, lighter weight — suitable for throttling applications and lower-flow systems.
Three Connection Types Available
All connections manufactured to applicable ASME B16 standards for reliable leak-free joints.
Flanged (RF / RTJ)
Per ASME B16.5 & B16.47
Raised Face (RF) and Ring Type Joint (RTJ) flange facings available. Widest compatibility with pipeline systems.
Socket Welded
Per ASME B16.11
Socket weld ends for high-pressure applications. Provides strong, leak-tight joint for small to medium pipe sizes.
Butt Welded
Per ASME B16.25
Butt weld ends for permanent, high-integrity connections. Preferred for high-temperature and high-pressure piping.
1/2" to 8" — Class 150LB to 2500LB
Full spectrum of sizes and pressure ratings to match your pipeline design specifications.
| Size Range | Pressure Class | Typical Application |
|---|---|---|
| 1/2" ~ 8" | Class 150LB, 300LB | General severe service, HVAC, industrial heat |
| 1/2" ~ 4" | Class 600LB | Mid-high pressure: refining, petrochemical |
| 1/2" ~ 2" | Class 900LB, 1500LB | High-pressure: oilfield, injection systems |
| 1/2" ~ 1-1/2" | Class 2500LB | Ultra-high pressure: critical oilfield, heavy petrochemical |
General Severe Service
Designed for general severe service applications where temperatures exceed soft-seated capabilities or mild abrasive media is present.
Industrial Heat Transfer
Steam distribution lines and thermal oil systems operating above 200°C in manufacturing facilities.
HVAC & District Heating
Central heating systems, district energy networks, and high-temperature water circulation loops.
Mild Erosion Service
Lines carrying fluids with fine solid particles where soft-seated seals would erode prematurely.
Mid to High Pressure Applications
Designed for high-pressure refining, petrochemical, and power generation applications with demanding temperature and pressure profiles.
Refining & Petrochemical
High-temperature hydrocarbon fluids, process lines, and corrosive media in refinery and petrochemical plants operating at elevated pressures.
- ✓ High-temp refinery gas lines
- ✓ Corrosive process piping
- ✓ catalytic cracking unit services
Power Generation
Boiler feedwater, steam header, and high-pressure turbine bypass systems in thermal power plants.
- ✓ High-pressure boiler feedwater
- ✓ Steam turbine bypass valves
- ✓ High-temp condensate return
Ultra-High Pressure Critical Service
Maximum pressure rating for the most demanding oilfield, petrochemical, and hydraulic system applications where failure is not an option.
High-Pressure Oilfield
Wellhead control valves, high-pressure Christmas tree valves, and subsea manifold valves for ultra-high-pressure oil and gas wells.
Heavy Petrochemical
Ultra-high-pressure reaction injection lines, hydrogenation reactors, and critical process isolation in advanced petrochemical facilities.
High-Pressure Hydraulic
High-pressure hydraulic control systems, pressure testing equipment, and instrumentation lines requiring ultra-high pressure ratings.
Fully Certified & Compliant
All CARILO metal-seated ball valves are designed, tested, and certified to international standards for industrial valves.
API 6D
Pipeline Valve Design & Manufacturing
API 607
Fire Safe Design Certified
ISO15848-2
CLASS A Fugitive Emission
PED 2014/68/UE
Pressure Equipment Directive
5 Reasons to Choose CARILO
API 6D Manufacturing
Built in certified Chinese facility to API 6D and ISO 5208 standards. Full material traceability and test reports.
350°C Metal-Seated Specialist
Purpose-built for high-temperature severe service where standard soft-seated valves cannot perform.
Competitive Pricing
Premium-grade valves at competitive China manufacturing prices. No compromise on quality or certification.
Global Export Ready
Experience exporting to oil & gas, petrochemical, and power generation projects worldwide. Documentation package ready for international procurement.
Technical Support
Dimensional drawings, material certificates, hydrostatic test reports, and API 598 inspection available with each order.
Full Test & Inspection
API 598 testing, API 607 fire-safe testing, ISO15848-2 fugitive emission testing available. Third-party inspection on request.
Frequently Asked Questions
What is the maximum temperature for metal-seated ball valves?
CARILO metal-seated floating ball valves are rated up to 350°C (-29°C to 350°C). This makes them suitable for high-temperature steam, hot oil, and thermal fluid applications that exceed the 200°C limit of soft-seated valves.
What is ISO 5208 Rate B?
ISO 5208 Rate B is an industrial shut-off grade for ball valves — not bubble-tight like Rate A, but suitable for general industrial applications where occasional minimal leakage is acceptable. Metal-seated valves achieve Rate B sealing due to the metal-to-metal interface characteristics.
Can metal-seated valves handle abrasive media?
Yes. The hard-faced metal sealing pairs in CARILO metal-seated valves are specifically designed to resist erosion and particle impact. They are ideal for lines carrying fluids with solid particles, sand, or catalyst media that would quickly damage soft polymer seats.
What pressure ratings are available?
CARILO metal-seated valves cover Class 150LB to 2500LB across sizes from 1/2" to 8". Size availability varies by pressure class — consult your local CARILO representative for specific combinations.
Are CARILO valves fire-safe certified?
Yes. All CARILO metal-seated ball valves are API 607 fire-safe certified, ensuring they maintain sealing integrity and prevent bypass during and after a fire event per API 6D requirements.
What end connections are available?
Three types: Flanged (RF and RTJ per ASME B16.5/B16.47), Socket Welded (per ASME B16.11), and Butt Welded (per ASME B16.25). Flanged is most common for ease of installation and maintenance.
What is the difference between full bore and reduced bore?
Full bore valves have an internal diameter equal to the pipe bore — enabling pigging and maximum flow. Reduced bore valves have a smaller bore — lower cost and lighter weight but restricts flow. Choose based on your flow and maintenance requirements.
What documentation is included with an order?
Each order includes dimensional drawings, material certificates (EN 10204 3.1), hydrostatic test reports per API 598, and API 607 fire-safe certificates. Optional: ISO15848-2 fugitive emission reports, third-party inspection (SGS/BV/etc.), and NDE reports.
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Whether you need a quotation, dimensional drawings, or technical consultation — our team is ready to support your next project.
