Product Overview
The KOZO CF8M Triple Offset Butterfly Valve is designed for demanding industrial isolation service where metal-seated performance, reduced seat rubbing and compact quarter-turn operation are required. The triple-offset geometry separates the disc sealing edge from the seat during most of the travel, minimizing friction and concentrated wear compared with concentric or conventional resilient-seated designs.
Why Triple Offset?
A triple-offset butterfly valve uses three geometric offsets to create a cam-like seating action. The seal contacts the seat primarily near the final closed position, which is beneficial for metal-seated service and repeated cycling in higher-temperature or more demanding process applications.
Key Design Features
- Triple-offset geometry: Reduces sliding contact between disc seal and body seat.
- CF8M stainless-steel body: Reference cast stainless construction for chemical and industrial service.
- Metal-seat option: Suitable for severe-service applications where resilient seats are not appropriate.
- Multiple pressure classes: Class 150 / 300 / 600 family.
- Quarter-turn actuation: Manual gear, pneumatic or electric actuation can be selected.
Technical Specifications
| Valve Type | Triple Offset Butterfly Valve |
|---|---|
| Body Material | ASTM A351 CF8M Stainless Steel |
| Size Range | 2 in – 60 in |
| Pressure Classes | ASME Class 150 / 300 / 600 |
| Design Standard | API 609 / ASME B16.34 as applicable |
| Inspection & Testing | API 598 |
| Seat | Metal seat / project-specific sealing system |
| Reference Temperature | -29°C to +425°C, configuration-dependent |
| Actuation | Gear / Pneumatic / Electric |
Typical Applications
- Chemical and petrochemical process lines
- Steam and thermal-fluid systems
- Power-generation service
- High-temperature industrial isolation
- Corrosive process piping compatible with CF8M
Selection Notes
The stated temperature range is configuration-dependent. Seal stack, packing, shaft material, trim and pressure class must be reviewed together. CF8M body material alone does not define the complete valve temperature limit.
Body and End Options
Wafer, lug, flanged and butt-weld arrangements may be available depending on the selected design. Lug-style and standard triple-offset pages should not be duplicated unless the body style and customer search intent are meaningfully different.
How to Specify This Valve
Please provide size, pressure class, medium, design temperature, body and trim material, end/body style, seat design, actuator and required testing/certification.
FAQ
What is the difference between triple-offset and double-offset butterfly valves?
The third offset introduces a conical sealing geometry that further reduces rubbing between the sealing surfaces, making triple-offset valves well suited to metal-seated severe service.
Can this valve be automated?
Yes. Pneumatic and electric actuator packages can be selected according to torque, fail-position requirement and control philosophy.
