ASTM A995 4A Duplex Stainless Steel Swing Check Valve - ANSI 1500Lb, API 594, 2" to 24"
Tengs Valve supplies high-quality ASTM A995 4A Duplex Stainless Steel Swing Check Valves (Non-Return Valves) for ANSI Class 1500Lb / CL1500, manufactured to ANSI B16.34, API 594, and API 6D standards with inspection and test per API 598. These high pressure swing check valves feature bolted bonnet (pressure seal bonnet optional), swing type disc design with flanged ends (Raised Face RF, RTJ). Available sizes 2″ to 24″ (DN50 to DN600). Body, bonnet, and disc are made of Duplex Stainless Steel A995 4A / A890 4A / CD3MN / 2205 / S31803, providing excellent resistance to chloride stress corrosion cracking and pitting corrosion. Ideal for oil & gas, offshore, desalination, chemical, and high chloride pipeline systems. NACE MR 0175 available on request. Industrial duplex stainless steel swing check valve supplier and exporter.
Specifications for ASTM A995 4A Flanged Swing Check Valve
• Design & Manufacture: ANSI B16.34, API 594, API 6D
• Types of Disc: Swing Type
• Types of Bonnet: Bolted Bonnet, Bolted Cover; Alternative: Pressure Seal Bonnet (PSB)
• Types of Bonnet Gasket: Ring
• Types of End Connections: Flange
• Types of Flange Face: Raised Face (RF), RTJ
• Types of Material: Duplex Stainless Steel, A995 4A, A890 4A, CD3MN, 2205, S31803
• Type of Trim: Duplex Stainless Steel, A995-4A, A890-4A
• Valve Size: 2 inch to 24 inch (DN50 to DN600)
• Valve Pressure: ANSI Class 1500Lb, CL1500
• Special Design: NACE MR 0175
• Inspection and Test: API 598
• Other materials and pressure ratings are available.
Main Material List for Duplex Stainless Steel Check Valves
| Part Name | Material | |
|---|---|---|
| A995 - 4A | A890 - 4A | |
| Body | A995 - 4A | A890 - 4A |
| Bonnet | A995 - 4A | A890 - 4A |
| Disc | A995 - 4A | A890 - 4A |
| Bolts / Nuts | Stainless Steel | Stainless Steel |
Reference: ANSI B16.34, API 594, API 6D, API 598. Materials may vary by model and pressure rating. Contact us for confirmed material certificate.
Main Face to Face Dimensions for 1500Lb Swing Check Valve
| Class | Size | Dimensions (mm) - L | |||
|---|---|---|---|---|---|
| NPS | DN | RF | RTJ | BW | |
| 1500Lb | 2 | 50 | 368 | 371 | 368 |
| 2 1/2 | 65 | 419 | 422 | 419 | |
| 3 | 80 | 470 | 473 | 470 | |
| 4 | 100 | 546 | 549 | 546 | |
| 6 | 150 | 705 | 711 | 705 | |
| 8 | 200 | 832 | 841 | 832 | |
| 10 | 250 | 991 | 1000 | 991 | |
| 12 | 300 | 1130 | 1146 | 1130 | |
| 14 | 350 | 1257 | 1276 | 1257 | |
| 16 | 400 | 1384 | 1407 | 1384 | |
| 18 | 450 | 1537 | 1559 | 1537 | |
| 20 | 500 | 1664 | 1686 | 1664 | |
| 24 | 600 | 1943 | 1972 | 1943 | |
Reference: ANSI B16.10, API 594. Dimensions may vary by manufacturer. Contact us for confirmed drawing and quotation.
Industrial Check Valve Dimension Details
Typical Applications of ASTM A995 4A Duplex Swing Check Valve
• Offshore and subsea pipelines: duplex 2205 resists chloride stress corrosion cracking in seawater environments.
• Oil & gas high pressure systems: Class 1500Lb suitable for high pressure wellhead and manifold lines.
• Desalination plants: excellent resistance to chloride pitting and crevice corrosion.
• Chemical and petrochemical: corrosive media where 316L is not sufficient.
• Power generation: flue gas desulfurization (FGD) and seawater cooling systems.
• Sour service: available with NACE MR 0175 compliance on request.
FAQ - ASTM A995 4A Duplex Stainless Steel Swing Check Valve 1500Lb
Q1: What is ASTM A995 4A duplex stainless steel?
A: ASTM A995 4A (also known as A890 4A, CD3MN, or UNS J92205) is a cast duplex stainless steel with a ferritic-austenitic microstructure. It is equivalent to wrought 2205 / S31803 / S32205 duplex stainless steel, offering high strength and excellent resistance to chloride stress corrosion cracking and pitting corrosion.
Q2: What is the difference between A995 4A and A890 4A?
A: A995 4A and A890 4A refer to the same material grade (CD3MN, 2205 duplex) under different ASTM standards. A890 was the older standard; A995 is the current standard for cast duplex stainless steels. Both designations are still widely used in the industry.
Q3: What are the pressure rating and size range?
A: This duplex swing check valve is rated ANSI Class 1500Lb (CL1500), with sizes from 2″ to 24″ (DN50 to DN600). Other pressure ratings and sizes are available on request.
Q4: What end connections are available?
A: This valve is available with flanged ends in Raised Face (RF) or RTJ, and butt weld (BW) ends. Flanged RTJ is commonly used for Class 1500 high pressure applications.
Q5: What is the difference between bolted bonnet and pressure seal bonnet?
A: Bolted bonnet is suitable for general high pressure service and is easy to maintain. Pressure seal bonnet (PSB) uses internal line pressure to tighten the seal, making it more suitable for very high pressure and high temperature applications. Both options are available for this duplex swing check valve.
Q6: Is NACE MR 0175 available?
A: Yes. NACE MR 0175 compliance is available on request for sour service applications. Please specify this requirement when requesting a quotation.
Get a Fast Quote for ASTM A995 4A Swing Check Valve
Send us your size, pressure rating, material, end connection, and quantity. Our team will reply within 24 hours with price, drawing, and delivery time.
Email: sales@tengsvalve.com
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