Super Duplex 2507 Stainless Steel Swing Check Valves

Exceptional Pitting and Crevice Corrosion Resistance: PRE ≥ 42 (typically 42–45) due to high chromium (24–26%), molybdenum (3.0–5.0%), and nitrogen (0.24–0.32%) content, providing superior resistance in seawater and aggressive chemical media.

Ultra-High Mechanical Strength: Minimum yield strength of ≥ 550 MPa (approximately 3.2 times that of 316L and 1.2 times that of Duplex 2205), providing structural integrity in high-pressure pulsating flow conditions.

Superior Chloride SCC Resistance: Excellent resistance to chloride-induced SCC, significantly outperforming both austenitic grades and standard duplex 2205 in high-temperature, high-chloride environments.

NACE MR0175 / ISO 15156 Compliant: Fully qualified for sour service with the highest allowable H₂S partial pressures and lowest pH values, documented HIC and SSC test reports available.

Excellent Low-Temperature Toughness: Maintains excellent impact toughness down to -50°C, suitable for Arctic, deepwater subsea, and cold climate applications (Charpy V-Notch ≥ 70J typical at -46°C).

Automatic Operation: Swing disc opens with forward flow, closes by gravity and reverse flow – no external power required.

Non-Slam Design Available: Tilting disc and spring-assisted designs provide quiet, non-slam operation for high-velocity applications.

Multiple Disc Types: Available with single disc, tilting disc, dual disc, and spring-assisted configurations.

Multiple End Connections: Flanged (ASME B16.5), RTJ (API 6A), wafer, lug, and butt weld (BW) connections.

Full Range of Types: Flanged swing check (2″–48″), tilting disc check (2″–24″), nozzle check (2″–36″), dual plate check (2″–48″).

Pressure Ratings: Available in Class 150, 300, 600, 900, 1500, and 2500 (API 6A up to 15,000 psi).

Temperature Range: Suitable for -50°C to 250°C (-58°F to 482°F) depending on seat material.

International Certifications: Valves can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with API 6D, API 594, API 6A, ASME B16.34, NACE MR0175, NORSOK M-630/M-650, and ISO 13628-4 standards.

Raw Material Selection: High-quality S32750 super duplex billets from certified premium mills (Outokumpu, Sandvik) with certified chemical composition and ferrite/austenite balance. Material is VIM-VAR processed for optimal cleanliness.

Forging: Valve body forged with strict temperature control to prevent intermetallic phase formation.

Heat Treatment – Solution Annealing: Solution annealing at 1050–1120°C followed by immediate water quenching (<30 seconds delay). Most critical step.

Ferrite Content Verification: 35–65% ferrite documented (minimum 40% for sour service).

Machining: CNC lathes and machining centers produce precise dimensions with specialized tooling.

Seat Hardfacing (if specified): Stellite overlay on seat ring for high temperature or erosive service.

Disc Machining: Disc machined to precise dimensions for proper seating.

Hardness Control: For NACE compliance, all wetted parts hardness verified ≤32 HRC.

Assembly: Body, seat ring, disc, hinge pin, bonnet, gasket, and bolting assembled.

Testing: Hydrostatic shell test, high-pressure seat test, low-pressure seat test, disc movement verification.

Marking: Laser engraved with size, pressure, material, heat number, API 6D, NACE MR0175, heat treatment condition.

Coating: External coating (epoxy or PTFE) for corrosion protection.

Pressure Testing: 100% hydrostatic shell test (1.5× rated pressure), high-pressure seat test (1.1× rated pressure), low-pressure air seat test (80 psi, bubble-tight).

Material Verification: PMI 100% for body, bonnet, disc, hinge pin – verification of Cr, Ni, Mo, N.

Ferrite Content Measurement: 35–65% ferrite documented.

Hardness Testing: ≤32 HRC for NACE compliance – 100% verified.

Charpy Impact Testing: -46°C (-50°F) documented for offshore service.

Dimensional Inspection: Face-to-face, flange dimensions, disc alignment.

Disc Travel Verification: Disc opens fully at design flow.

Leakage Testing: API 598 / ISO 5208 – Rate A (zero detectable leakage for soft seat).

Pitting Corrosion Test: ASTM G48 Method A – upon request.

NACE Compliance: Full documentation with hardness verification.

HIC/SSC Testing: NACE TM0284 / NACE TM0177 – upon request.

Third-Party Inspection: ABS, BV, DNV, LR, GL, TUV on customer request.

Deepwater Subsea Oil & Gas: Subsea manifold check valves, pipeline end termination (PLET) check valves, jumper connection check valves (ISO 13628-4 compliant, ABS/BV/DNV certified for deepwater to 3000m).

HP/HT Sour Gas Pipelines: High-pressure, high-temperature sour gas pipeline check valves, wellhead flowline backflow prevention (NACE MR0175 compliant, highest H₂S limits).

Offshore Platforms (Critical Service): Topsides HP/HT process check valves, produced water lines, gas dehydration unit check valves (NORSOK M-650 certified).

Seawater Systems (High Velocity): High-pressure seawater injection pump discharge check valves, deepwater seawater lift system check valves, firewater system check valves.

Desalination Plants (High Temperature): High-pressure reverse osmosis (HPRO) feed pump check valves, brine discharge line check valves, energy recovery device protection.

Flue Gas Desulfurization (FGD): Slurry lines, absorber tower pump discharge check valves – for high-chloride, low-pH zones.

Hydrometallurgy: Pressure acid leaching (PAL) pump discharge check valves, high-temperature solvent extraction check valves.

Geothermal Energy: High-temperature, high-chlorine brine pipeline check valves, steam condensate check valves.

Critical Note: Swing check valves require sufficient forward flow velocity to fully open the disc. Minimum recommended velocities: 10 ft/s (3 m/s) for horizontal lines, 5 ft/s (1.5 m/s) for vertical-up lines. For low flow conditions, consider spring-assisted or tilting disc check valves. Do not use swing check valves in vertical-down flow. For deepwater subsea applications, spring-assisted tilting disc design is recommended to prevent slamming.

1. What is the difference between Super Duplex 2507 and Duplex 2205 swing check valves?
Super Duplex 2507 has higher chromium (24-26% vs 22-23%), higher molybdenum (3-5% vs 3-3.5%), and higher nitrogen (0.24-0.32% vs 0.14-0.20%), giving PRE ≥42 (vs ≥35) and higher strength (YS ≥550 MPa vs ≥450 MPa). For deepwater subsea and HP/HT sour gas, 2507 is the preferred material.

2. What is the maximum water depth for Super Duplex 2507 swing check valves?
With proper design, Super Duplex 2507 check valves are suitable for water depths up to 3000 meters (10,000 feet) for subsea applications. External pressure collapse rating verified per API 17D.

3. Are Super Duplex 2507 check valves suitable for HP/HT sour service?
Yes, Super Duplex 2507 is fully NACE MR0175 / ISO 15156 compliant for sour service up to 232°C (450°F) with the highest allowable H₂S partial pressure limits for duplex stainless steels.

4. What is tilting disc check valve?
Tilting disc check valve has a disc that rotates on an eccentric pivot, providing non-slamming operation, lower pressure drop, and better performance in high velocity and pulsating flow conditions. Recommended for deepwater subsea HP/HT applications.

5. Can swing check valves be installed vertically?
Yes, but only in vertical-up flow (flow upward). Vertical-down installation will cause the disc to close due to gravity. For vertical-down flow, use spring-assisted or nozzle check valves.

6. What seat material is recommended for HP/HT sour gas service?
PEEK (Polyetheretherketone) is recommended for HP/HT sour gas service due to its high temperature capability (up to 250°C), excellent chemical resistance, and low outgassing properties. Metal seated (Stellite) is available for higher temperatures.

Complete Subsea Range: Flanged swing, tilting disc, nozzle, dual plate, pressure seal – all types available for deepwater projects.

Strict Quality Control: ISO 9001, API 6D, API 6A, NORSOK M-650 certified.

NACE MR0175 / ISO 15156 Compliant: Highest H₂S partial pressure tolerance, with HIC/SSC test reports.

API 6A High Pressure: 5,000-15,000 psi wellhead and subsea check valves.

NORSOK M-630/M-650 Qualified: Complete documentation packages for offshore and subsea projects.

ISO 13628-4 Compliant: Suitable for subsea production systems.

Ferrite Controlled: 35–65% ferrite documented on every valve.

100% Pressure Tested: Hydrostatic shell test, high and low pressure seat tests.

Charpy Impact Tested: -46°C (-50°F) documented for offshore service.

Full Traceability: Heat number on body – traceable to raw mill certificate.

Deepwater Subsea Experience: Proven supply record for deepwater subsea projects globally.

Global Delivery: Exported to major deepwater subsea projects worldwide.

Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on Super Duplex 2507 stainless steel swing check valves. We offer certified quality, NACE MR0175 compliance, NORSOK M-650 documentation, ferrite-controlled material, fast production lead times, and reliable global delivery for your deepwater subsea and HP/HT sour gas projects.

Stock Examples (Flanged Super Duplex 2507 Swing Check Valves – Class 300 – Single Disc – Deepwater Subsea):

Stock Examples (Flanged Super Duplex 2507 Swing Check Valves – Class 600 – RTJ – HP/HT Sour Service – Tilting Disc):

Stock Examples (Wafer Super Duplex 2507 Dual Plate Check Valves – Class 150 – Compact Design – Limited Space):

Related Keywords (Super Duplex 2507 Swing Check Valves):

Super Duplex 2507 swing check valve, S32750 flanged swing check, tilting disc check valve non-slam, API 6D Super Duplex check valve, NACE MR0175 check valve for sour service, HP/HT check valve Class 1500, deepwater subsea check valve 3000m, ROV operated check valve, non-slam check valve for high velocity, pump discharge check valve, backflow prevention valve, dual plate wafer check valve compact design, pressure seal check valve high pressure, spring assisted silent check valve, nozzle check valve for vertical lines, API 6A subsea check valve 15000 psi, pipeline check valve for HP/HT sour gas, wellhead flowline check valve, produced water check valve, ISO 13628-4 subsea check valve, NORSOK M-650 certified, ferrite controlled 35-65%, Charpy impact tested -46°C, ASTM G48 pitting tested, HIC tested NACE TM0284, SSC tested NACE TM0177, deepwater subsea check valve, subsea manifold isolation valve, PLET check valve pipeline end termination.