Product Overview
The KOZO 904L Stainless Steel Sleeved Plug Valve is intended for corrosive chemical and process services where a high-alloy austenitic stainless steel body and PTFE sleeve sealing are required. The sleeve isolates the plug from the body and provides the primary sealing interface for quarter-turn operation.
Why 904L Stainless Steel?
904L / UNS N08904 is a high-alloy austenitic stainless steel containing elevated nickel, chromium and molybdenum with copper additions. It is used in a range of acid and chloride-containing process environments where conventional 316L may not provide sufficient corrosion resistance. Final suitability depends on concentration, temperature, pressure and the complete valve metallurgy.
Key Design Features
- Sleeved plug design: PTFE sleeve provides the primary sealing interface around the plug.
- 904L body material: Reference UNS N08904 / ASTM F904L family for corrosive chemical service.
- Quarter-turn operation: Compact isolation with short operating travel.
- Flanged ends: RF reference configuration for process piping systems.
- Gear operation: Available for larger sizes or higher operating torque.
Technical Specifications
| バルブの種類 | Sleeved Plug Valve |
|---|---|
| 本体材質 | 904L Stainless Steel / UNS N08904 |
| Reference Sizes | 6 in and DN250 examples available by configuration |
| Reference Pressure | クラス 150 / クラス 300 examples |
| Sleeve | PTFE |
| Design Standard | API 599 / API 6D where applicable |
| Face-to-Face | ASME B16.10 |
| Inspection & Testing | API 598 |
| End Connection | RF Flanged |
| Operation | Lever / Worm Gear depending on size |
Typical Applications
- Chemical processing
- Acid transfer and isolation
- Fertilizer and specialty chemical systems
- Chloride-containing process streams
- Corrosive utility and process piping
Selection Notes
904L material selection should be based on the actual chemical concentration, temperature, pressure and expected contaminants. PTFE sleeve temperature and chemical compatibility must also be checked against the process medium.
Available Configurations
Size, pressure class, plug trim, sleeve material, operator and end connection can be selected according to the project. Automation can be reviewed where remote operation is required.
How to Specify This Valve
Please provide size, pressure class, medium, concentration, temperature, body/trim material, sleeve material, end connection, operator and quantity.
FAQ
What is the function of the PTFE sleeve?
The sleeve provides the primary sealing interface between the plug and valve body, reducing metal-to-metal contact and supporting tight quarter-turn isolation.
Why use 904L instead of 316L?
904L is considered for more aggressive acid and chloride-containing environments where additional alloying content may provide improved corrosion resistance, subject to actual service conditions.
