Product Overview
The KOZO Cryogenic Triple Offset Butterfly Valve is designed for LNG, air-separation and other low-temperature process systems where compact quarter-turn isolation and a metal-seated sealing system are required. Triple-offset geometry reduces rubbing between the disc seal and seat, while an extended bonnet helps keep stem-packing components away from the coldest part of the valve.
Key Design Features
- Triple-offset geometry: Minimizes sliding contact between sealing surfaces.
- Extended cryogenic bonnet: Moves stem sealing components away from the cryogenic zone.
- Metal-seat construction: Suitable for validated low-temperature service where resilient seats are not appropriate.
- Quarter-turn operation: Compact manual or automated isolation.
- API'si 609 design family: Reference standard for butterfly valve configuration.
Technical Specifications
| Valve Type | Cryogenic Triple Offset Butterfly Valve |
|---|---|
| Design Standard | API'si 609 |
| Seat | Metal Seat |
| Bonnet | Extended Cryogenic Bonnet |
| Reference Minimum Temperature | Down to -196°C for validated configurations |
| Actuation | Gear / Pnömatik / Elektrik |
| Typical Service | LNG / LN2 / LAr / Air-Separation Service |
Typical Applications
- LNG storage and transfer
- Air-separation units
- Liquid nitrogen and argon systems
- Cryogenic terminals
- Low-temperature chemical process piping
Selection Notes
Low-temperature capability must be confirmed for the complete valve configuration, including body and trim metallurgy, shaft, disc seal, packing, bolting and cryogenic testing. The -196°C value should only be used for a validated cryogenic design.
How to Specify This Valve
Please provide size, pressure class, medium, design temperature, body/trim material, seat design, end/body style, actuator, fail position and required cryogenic testing.
FAQ
Why use triple-offset geometry for cryogenic service?
The geometry minimizes rubbing between the sealing surfaces and supports metal-seated quarter-turn isolation.
Why is the bonnet extended?
The extended bonnet moves packing and actuator interfaces farther from the cold zone, helping maintain sealing performance.
