 |
| Quantity: | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| The SDF High-Temperature Welded Check Valve Series represents a premier tier of industrial non-return piping components, purpose-built to prevent catastrophic fluid backflow in extreme-pressure and high-velocity thermal environments. This series is heavily utilized as an extraction check valve—serving as a critical frontline shield for turbine systems, main steam lines, and high-pressure boiler feed loops in modern thermal power plants. By utilizing a high-integrity welded end design instead of traditional bolted flange joints, this valve series completely mitigates the risks of thermal-shock-induced gasket relaxation and fugitive emissions. When forward fluid velocity drops, the internal swing disc responds immediately, pivoting smoothly onto the body seat under gravity and backpressure to isolate the upstream line. Available in heavy-wall forged or cast carbon steel and premium stainless steel alloy matrices, the SDF-WCV-HT series combines fluid dynamic efficiency with robust wear resistance to maximize plant runtime and operational safety. | |||||||||
SDF
Parameter | Specification |
Size | DN200~600 |
Pressure | PN100~160 (or Class 600~900) |
Material | Alloy Steel (15CrMo), Carbon Steel |
Standard | GB/T 12236 |
Medium | High Temperature Steam, High-pressure Water, And Oil Products |
Temperature | ≤ 550°C |
Zero-Leakage Pressure Boundary: The fully welded body ends remove the risk of joint relaxation under severe thermal shock, ensuring compliance with strict zero-fugitive-emission environmental mandates.
Self-Tightening Bonnet Integrity: The pressure-seal bonnet configuration utilizes a specialized graphite or metallic sealing ring that converts internal fluid forces into mechanical sealing force, making it impervious to high-pressure spikes.
Superior High-Temperature Creep Resistance: The 15CrMo alloy matrix maintains high yield strength and structural stability at continuous operating temperatures reaching up to 550°C.
Stellite Hard-Faced Trim: Seat and disc faces exhibit a hardness rating that preserves tight shutoff capabilities, even when handling abrasive particulates or suffering through thousands of high-velocity open/close cycles.
Optimized Flow Dynamics: The internal cavity design minimizes flow stagnation zones, preventing sediment accumulation while maximizing the flow coefficient .
This valve is specifically tailored for "Critical Path" applications where failure is not an option:
Power Generation: Main steam lines, boiler feed water systems, and turbine extraction lines where high-pressure steam is prevalent.
Petrochemical & Refining: High-temperature oil refining, catalytic cracking units, and hydrogen-rich environments.
Industrial Steam Systems: Centralized heating plants and high-pressure steam distribution networks.
Chemical Processing: Transport of non-corrosive or mildly corrosive fluids at high pressure where zero leakage to the atmosphere is required.
The SDF high-temperature welded check valve series serves as a critical safety boundary across high-parameter utility grids:
Thermal & Nuclear Power Plants: Steam extraction lines on steam turbines, boiler feedwater isolation loops, heater drains, and auxiliary steam headers.
Petrochemical Complexes & Refineries: High-temperature hydrocracker lines, catalytic reforming networks, ethylene processing loops, and high-pressure gas headers.
Heavy Industrial Utilities: High-pressure superheated steam distribution piping networks across paper mills, metallurgy plants, and chemical processing complexes.
Operating within critical power plant extraction loops requires absolute structural accountability. SDF subjects every welded check valve to comprehensive testing tracking:
100% Non-Destructive Testing (NDT): All pressure-retaining castings or forgings undergo exhaustive Radiographic Testing (RT) or Ultrasonic Testing (UT) to verify flawless sub-surface density before machining.
High-Pressure Hydraulic Sealing: Hydrostatic shell tests are applied at $1.5 \times$ the nominal design pressure, complemented by low-pressure pneumatic seat checks per API 598 to ensure a tight, dependable closure boundary.
Precision Seat Lapping Inspections: The hard-faced sealing geometries pass microscopic blue-ing checks to confirm total surface contact conformity between the wedge disc and body seat, ensuring outstanding performance right out of the box.
1.When can I get a quotation?
We typically provide a quotation within 4 hours of receiving your inquiry. Urgent requests are given priority.
2.Do you support customized valves?
Yes. We support OEM and customized valves according to drawings, specifications, and special working conditions.
3.What is the production lead time?
Normally, production can be completed within 15 working days after order confirmation, depending on product type and quantity.
4.What standards do your valves comply with?
Our products comply with GB, ANSI, API, JIS, DIN, BS, and other international standards.
5.What pressure, size, and temperature ranges can you supply?
Pressure: Class 150-3500 Size: DN10-DN3000 Temperature: -196ºC to 610ºC
6.What certifications do you have?
We are certified with ISO 9001, CE, and provide third-party inspection and test reports upon request.
7.What delivery and payment terms do you offer?
Delivery terms: EXW, FOB, CFR, CIF
Payment terms: T/T (30% deposit + 70% balance), L/C, and other terms by agreement.
8.Do you provide technical support and spare parts?
Yes. We offer 24/7 technical support and supply spare and consumable parts for long-term service.
