Description
Austenitic stainless steel industrial valve
304 Stainless Steel Triple Offset Butterfly Valve
A practical general-purpose stainless steel choice for non-marine process, water, food and utility service. The triple offset butterfly valve configuration is engineered for compact high-temperature or severe-service process isolation.
What is a 304 Stainless Steel Triple Offset Butterfly Valve?
A 304 Stainless Steel Triple Offset Butterfly Valve combines a chromium-nickel austenitic stainless steel family offering general corrosion resistance, cleanability and broad fabrication experience with a quarter-turn metal-seated design using three geometric offsets to reduce seat rubbing and support severe-service isolation.
304 is often the commercial material name, while pressure-containing cast bodies are normally ordered by a casting grade such as CF8 or CF3 rather than simply as 304. Seat-stack design, pressure direction, leakage class, shaft loading, thermal cycling and actuator torque are configuration-specific.
304 Stainless Steel Triple Offset Butterfly Valve specifications
| Product | 304 Stainless Steel Triple Offset Butterfly Valve |
|---|---|
| Valve construction | Triple-eccentric metal-seated butterfly valve in wafer, lug, double-flanged or butt-weld body pattern |
| Nominal material | 304 Stainless Steel |
| UNS / EN reference | UNS S30400/S30403; EN 1.4301/1.4307 |
| Product forms | Wrought ASTM A182 F304/F304L; cast ASTM A351 CF8/CF3; exact component specification stated on order |
| Design standards | API 609 and ASME B16.34; EN 593 option for applicable European projects |
| Pressure testing | API 598, EN 12266-1 or project-specified shell and seat testing |
| Pressure rating | ASME Class or PN rating verified against exact material, size, construction and design temperature |
| End connections | Wafer, lug, double-flanged or butt-weld body patterns according to design |
| Operation | Gearbox, pneumatic, electric or hydraulic actuator |
| Documentation | EN 10204 3.1 material records, pressure test report, GA drawing and project inspection records as ordered |
This is an engineered inquiry product, not a universal stock specification. Final availability depends on valve size, pressure class, material form, trim, seat system, operator, quantity and required code edition.
304 Stainless Steel material selection
| Selection point | Engineering guidance |
|---|---|
| Material profile | a chromium-nickel austenitic stainless steel family offering general corrosion resistance, cleanability and broad fabrication experience |
| Why it is selected | Broad availability, good fabrication and useful corrosion resistance in many mild industrial environments. |
| Typical service | Fresh water, food and beverage, non-chloride chemicals, clean utilities and general process duties. |
| Limitations to check | Chloride pitting, crevice corrosion and stress-corrosion cracking must be assessed; it is not the default choice for seawater or aggressive reducing acids. |
| Specification route | Wrought ASTM A182 F304/F304L; cast ASTM A351 CF8/CF3; exact component specification stated on order |
| Verification | MTC review, heat traceability and PMI when required; low-carbon grade confirmed where welding and sensitization control matter. |
Triple Offset Butterfly Valve design and standards
API 609
Common design basis for butterfly valves; category, body pattern, seat design and edition must be identified.
ASME B16.34
Pressure-temperature and general valve design requirements where applicable.
API 598 / EN 12266-1
Shell and seat testing selected for the applicable project and market.
API 607 / ISO 10497
Fire-safe qualification applies only to the exact seat, seal and valve configuration.
Seal ring, seat stack, pressure direction, shaft/packing system, bearing loads and actuator safety factor must be reviewed as a complete package.
Fire-safe, fugitive-emission, sour-service, oxygen, cryogenic, chlorine and PED requirements apply only when explicitly defined and supported for the exact offered configuration.
Typical applications
| Industry | Material service context | Valve selection focus |
|---|---|---|
| Food and beverage | Clean water, product transfer and utility systems with compatible cleaning chemistry | Pressure direction, leakage class, metal-seat design, temperature, torque and fire-safe/emissions qualification |
| Water treatment | Fresh-water and low-chloride treatment stages | Pressure direction, leakage class, metal-seat design, temperature, torque and fire-safe/emissions qualification |
| General chemical | Mild oxidizing and non-halide process media after compatibility review | Pressure direction, leakage class, metal-seat design, temperature, torque and fire-safe/emissions qualification |
| Building and utility | Clean utility, HVAC and non-marine industrial services | Pressure direction, leakage class, metal-seat design, temperature, torque and fire-safe/emissions qualification |
Application examples are not a corrosion or design approval. The end user must verify process chemistry, contaminants, pressure, temperature, velocity, cycling, emissions and regulatory requirements.
Quality, testing and traceability
Heat-number traceability and EN 10204 3.1 records matched to the ordered component specifications.
MTC review, heat traceability and PMI when required; low-carbon grade confirmed where welding and sensitization control matter.
API 598, EN 12266-1 or project-specified shell and seat testing, with acceptance and leakage criteria stated on the order.
GA drawing, dimensions, marking, operation, pressure test and specified NDE/third-party records.
RFQ checklist
- Valve design standard and required edition
- Nominal size and ASME Class or PN rating
- Exact material specifications for pressure boundary, trim, seats, packing and bolting
- Body pattern, face-to-face, pressure direction, leakage class, seal-ring design and actuation
- End connection, facing and face-to-face requirement
- Fluid composition, concentration, contaminants and solids
- Design and operating pressure/temperature
- PMI, corrosion testing, NDE, witnessing and document requirements
Frequently asked questions
Is CF8 the same as 304 stainless steel?
CF8 is a cast austenitic stainless steel commonly associated with wrought 304 chemistry, but casting and wrought specifications have different requirements. The purchase order should state the governing ASTM grade.
When should 316 be selected instead of 304?
316/CF8M is often considered when molybdenum is beneficial for chloride pitting resistance, but neither grade is automatically suitable for seawater or every chemical service.
Can 304L components be welded?
304L is widely used for welded fabrication because of its lower carbon limit, but the approved welding procedure, filler metal, heat input and post-fabrication condition still control performance.
What are the three offsets?
They separate the shaft from the seat and body centerlines and add a conical sealing geometry, allowing rapid seat disengagement during opening.
Is every triple offset butterfly valve bidirectional?
No. Some designs have a preferred pressure direction or different leakage capability by direction. Confirm the tested performance of the exact configuration.
Can 304 Stainless Steel be used for every component in this triple offset butterfly valve?
Not automatically. Pressure-boundary, trim, stem or shaft, seating, packing, gasket and bolting materials have different mechanical and corrosion duties. The complete bill of materials must be engineered for the service.
Related 304 Stainless Steel valve products
Need a broader comparison? View the general stainless steel and alloy butterfly valves guide or browse all Butterfly Valves.
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