Description
Nickel-chromium-molybdenum-tungsten alloy industrial valve
Hastelloy C276 Swing Check Valve
A premium severe-corrosion valve material for chemical, pollution-control and mixed-acid systems. The swing check valve configuration is engineered for backflow prevention in steady-flow process and utility lines.
What is a Hastelloy C276 Swing Check Valve?
A Hastelloy C276 Swing Check Valve combines a nickel-chromium-molybdenum alloy with tungsten and low carbon/silicon, valued for broad resistance in many reducing and oxidizing chemical environments with an automatic non-return design whose hinged disc opens with forward flow and closes as flow decelerates or reverses.
C276 is selected from detailed chemical compatibility data, including concentration, temperature, oxidizers, reducers, chlorides and process contamination. Check valves should be sized from minimum, normal and maximum flow plus transient behavior rather than automatically matching the pipe size.
Hastelloy C276 Swing Check Valve specifications
| Product | Hastelloy C276 Swing Check Valve |
|---|---|
| Valve construction | Bolted-cover swing check valve with hinged disc and service-specific seat/hinge arrangement |
| Nominal material | Hastelloy C276 |
| UNS / EN reference | UNS N10276; EN 2.4819 |
| Product forms | Wrought/forged ASTM B564 or B462 UNS N10276 as applicable; cast body grade selected to ASTM A494 and project chemistry requirements |
| Design standards | API 594 and ASME B16.34; API 6D only for specifically designed pipeline-service valves |
| Pressure testing | API 598 or project-specified shell and closure testing |
| Pressure rating | ASME Class or PN rating verified against exact material, size, construction and design temperature |
| End connections | RF/RTJ flanged or butt-weld ends according to design |
| Operation | Automatic; external lever/weight, spring assist or dashpot only when engineered |
| 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.
Hastelloy C276 material selection
| Selection point | Engineering guidance |
|---|---|
| Material profile | a nickel-chromium-molybdenum alloy with tungsten and low carbon/silicon, valued for broad resistance in many reducing and oxidizing chemical environments |
| Why it is selected | Broad chemical resistance and useful welded-fabrication performance in many aggressive media. |
| Typical service | Mixed acids, wet chlorine, pollution control, chemical waste treatment and aggressive process streams. |
| Limitations to check | No nickel alloy is universal. Strongly oxidizing hot media, molten salts and service-specific impurities require specialist review. |
| Specification route | Wrought/forged ASTM B564 or B462 UNS N10276 as applicable; cast body grade selected to ASTM A494 and project chemistry requirements |
| Verification | 100 percent PMI where specified, heat traceability, MTC chemistry review and strict material segregation for high-value alloy components. |
Swing Check Valve design and standards
API 594
Common design and testing basis for check valves within its scope.
ASME B16.34
Pressure-temperature, material and general valve design requirements within scope.
API 598
Shell and closure pressure-testing basis when specified.
API 6D
Pipeline-service requirements apply only to valves specifically designed and documented to API 6D.
Disc stability, minimum velocity, pressure drop, orientation, pump trip and system transients affect slam risk and service life.
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 |
|---|---|---|
| Chemical processing | Mixed acids, reactor systems and corrosive transfer lines | Minimum stable velocity, orientation, pressure drop, disc dynamics, closure leakage and transient control |
| Pollution control | FGD, scrubber and acidic waste-treatment systems | Minimum stable velocity, orientation, pressure drop, disc dynamics, closure leakage and transient control |
| Pulp and paper | Selected bleaching and wet-chlorine environments | Minimum stable velocity, orientation, pressure drop, disc dynamics, closure leakage and transient control |
| Pharmaceutical and fine chemical | Aggressive reagent and multipurpose batch systems | Minimum stable velocity, orientation, pressure drop, disc dynamics, closure leakage and transient control |
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.
100 percent PMI where specified, heat traceability, MTC chemistry review and strict material segregation for high-value alloy components.
API 598 or project-specified shell and closure 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
- Minimum/normal/maximum flow, fluid properties, line orientation and pump/system transient data
- 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 Hastelloy C276 the same as UNS N10276?
UNS N10276 is the standardized alloy designation commonly marketed as Hastelloy C276. Purchase documents should identify the UNS number and governing product specification.
Why is PMI important for C276 valves?
C276 resembles other nickel alloys visually. PMI helps verify key alloying elements and prevents costly material mix-ups during manufacture and maintenance.
Can a cast valve body be specified simply as wrought N10276?
No. Wrought and cast products follow different specifications and may use different grade designations. The cast-body grade must be stated separately and reviewed for equivalent service performance.
What causes swing check valve slam?
Oversizing, low velocity, excessive disc travel and rapid flow reversal can cause impact closure. Correct hydraulic sizing and transient review are essential.
Can a swing check valve be installed vertically?
Only when approved for vertical upward flow and the operating velocity can open and stabilize the disc. Follow the qualified design and installation instructions.
Can Hastelloy C276 be used for every component in this swing check 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 Hastelloy C276 valve products
Need a broader comparison? View the general stainless steel and alloy check valves guide or browse all Check Valves.
Request a Hastelloy C276 Swing Check Valve quotation
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