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| Designed for reliable one-way flow control in high-pressure and high-temperature applications. Constructed from carbon steel or alloy steel (15CrMo), it features a robust design with excellent resistance to thermal shock and wear, ensuring long service life. Available in sizes from DN200 to DN600 and pressure ratings up to PN160 (Class 900), this valve complies with GB/T 12236 and is suitable for high-temperature steam, hot water, and oil services at temperatures up to 550°C. Ideal for power generation, petrochemical, and industrial pipeline systems. | |||||||||
SDF
Parameter | Specification |
Size Range | DN200 ~ DN600 |
Pressure Rating | PN100 ~ PN160 (or Class 600 ~ 900) |
Body Material | Alloy Steel (15CrMo), Carbon Steel |
Design Standard | GB/T 12236 |
Applicable Media | High-Temperature Steam, High-Pressure Water, Petroleum Products |
Operating Temperature | ≤ 550°C |
• Zero-Leakage Pressure Boundary: The fully welded body construction eliminates joint relaxation risks under severe thermal shocks, strictly meeting zero-fugitive-emission environmental requirements.
• Self-Energized Pressure Seal Integrity: The pressure-seal bonnet utilizes a specialized graphite or metallic sealing ring that converts internal fluid pressure into mechanical sealing force, making it immune to high-pressure surges.
• Outstanding High-Temperature Creep Resistance: The 15CrMo alloy steel matrix retains high yield strength and structural integrity during continuous high-temperature service up to 550°C.
• Stellite Hard-Faced Sealing Surfaces: The hard-faced seat and disc preserve tight shut-off performance even under abrasive particulate wear or after thousands of high-velocity actuation cycles.
• Hydrodynamically Optimized Cavity: The engineered internal flow path minimizes stagnation zones, preventing sediment accumulation while maximizing flow capacity .
Engineered specifically for "Critical Path" applications where absolute operational reliability is paramount:
• Power Generation: Main steam lines, boiler feed water systems, and turbine extraction lines handling high-pressure steam.
• Petrochemical & Refining: High-temperature oil refining, catalytic cracking units (FCCU), and hydrogen-rich processing circuits.
• Industrial Steam Distribution: Centralized thermal power plants and high-pressure steam piping networks.
• Chemical Processing: Conveyance of non-corrosive or mildly corrosive high-pressure fluids requiring complete containment.
To ensure maximum service life and operational reliability of your SDF Welded Check Valve, please observe the following guidelines:
Ensure system flow velocity is sufficient to keep the valve disc fully open. Low flow rates can cause disc "fluttering," leading to accelerated wear on the hinge pin and seating surfaces.
Carbon Steel: Ideal for standard high-temperature water and steam services.
15CrMo Alloy Steel: Recommended for high-temperature steam and oil applications exceeding 400°C to prevent hydrogen embrittlement and thermal oxidation.
Swing check valves perform best in horizontal pipelines. For vertical pipeline installations, flow direction must be upward to ensure gravity assists in disc closure.
Despite the welded ends, maintain clear access to the top bonnet. This allows for in-line inspection and seat lapping without cutting the valve from the pipeline.
When welding 15CrMo or heavy-section carbon steel bodies, proper Pre-Heating and Post-Weld Heat Treatment (PWHT) are mandatory to prevent stress cracking in the Heat-Affected Zone (HAZ).
Q1: How soon can I receive a quotation?
Quotations are typically provided within 4 hours of receiving your inquiry. Urgent requirements receive immediate priority.
Q2: Do you support custom valve manufacturing?
Yes. We provide OEM and custom manufacturing services tailored to your technical drawings, specifications, and special operating conditions.
Q3: What is the typical production lead time?
Standard orders are typically completed within 15 working days after order confirmation, depending on the valve type and quantity.
Q4: What manufacturing standards do your valves comply with?
Our valves adhere to major international standards including GB, ANSI, API, JIS, DIN, and BS.
Q5: What pressure, size, and temperature ranges do you offer?
Pressure Rating: Class 150 – Class 3500
Nominal Diameter: DN10 – DN3000
Temperature Range: -196°C to 610°C
Q6: What quality certifications do you hold?
We are certified under ISO 9001 and CE. Third-party inspection and test reports are available upon request.
Q7: What are your delivery and payment terms?
Delivery Terms: EXW, FOB, CFR, CIF
Payment Terms: T/T (30% deposit + 70% balance), L/C, or as mutually agreed.
Q8: Do you provide technical support and spare parts?
Yes. We offer 24/7 technical support and maintain a comprehensive supply of spare parts and wearing components for long-term service support.
