1.Comprehensive Technical Specifications
Component & System Parameter | Standard Industrial Specification & Field Options |
Brand / Manufacturer | SDF |
Valve Classification | Check Valve / Swing Check Valve (Non-Return Valve) |
Bonnet Configuration | Bolted Bonnet (BB) / Pressure Seal Option for High Pressures |
Design Standards | API 6D, BS 1868, ASME B16.34 |
Nominal Size Range | DN50 to DN600 / 2 Inch to 24 Inch |
Pressure Ratings | ASME Class 150, Class 300, Class 600 / PN16 to PN100 |
Body & Bonnet Metallurgy | ASTM A216 WCB (High-Performance Carbon Steel) |
Disc Sealing Face Layer | Stellite Hard Alloy Overlay / Premium Stainless Steel Trim |
Seat Ring Interface | Welded-in Seat Ring / Threaded Option with Hardened Overlay |
End Connection Style | Flanged Ends Raised Face (RF to ASME B16.5 / EN 1092-1) |
Applicable Fluid Media | Steam, Water, Industrial Oils, Hydrocarbons |
Working Temperature Scope | High-Temperature Capabilities ≤550°C |
Testing Compliance | API 598 Hydrostatic and Pneumatic Testing Standard |
2. Key Features and Engineered Advantages
1. High-Temperature Carbon Steel Cast Body: Cast from heavy-wall ASTM A216 WCB carbon steel, the valve structure easily withstands intense pipeline stress and thermal shocks. The metallurgy is specifically selected to maintain mechanical strength and prevent creep deformation in intense thermal loops up to 550°C.
2. Unobstructed Full-Bore Flow Design: The inner body bowl is mathematically optimized to let the swing disc swing completely out of the path under standard forward velocities. This full-bore design delivers exceptionally high flow coefficients ($C_v$), minimizes turbulence, and reduces localized pressure drop across the seating chamber.
3. Robust Bolted Bonnet Architecture: The heavy bolted bonnet joint ensures robust pressure containment and simple maintenance access. The joint uses a specialized spiral wound gasket to eliminate fugitive emissions, allowing service crews to quickly inspect the internal hinge pin and disc without unmounting the valve from the flanged piping.
4. Stellite Hard-Faced Sealing Surface: Both the seat ring and the seating perimeter of the swing disc are hard-faced with premium Cobalt-Chromium (Stellite) alloys. This premium overlay provides superior wear resistance, preventing wire-drawing and high-velocity erosion when cutting off high-temperature steam loops.
5. Internal Hinge Pin Assembly: The heavy-duty internal hinge pin and arm assembly are entirely enclosed within the body walls. This prevents the need for through-holes or external plugs, completely eliminating a common atmospheric leak path found in cheaper, legacy designs.
3. Typical Industry Applications
The SDF high-temperature carbon steel swing check valve handles severe non-return isolation across critical utility networks:
1. Thermal Power Plants & Boiler Utilities: Main steam lines, boiler feed water injection lines, high-pressure heater drain lines, and auxiliary steam headers.
2. Oil and Gas Pipelines: Protection boundaries at pumping stations, crude oil transmission skids, product storage terminals, and natural gas gathering networks.
3. Petrochemical & Chemical Refining: High-temperature hydrocarbon processing lines, thermal oil loops, utility water networks, and cooling tower circulation manifolds.
4. General District Heating & Utilities: Large-scale high-pressure hot water loops, industrial steam distribution networks, and industrial utility headers.
4. Quality Assurance and Precision Pre-Shipment Compliance Testing
To guarantee zero-leakage performance and long-term durability in high-temperature plants, every SDF swing check valve passes strict factory validation protocols:
Hydrostatic Body Shell Pressure Testing: Every cast housing undergoes structural pressure validation at $1.5 \times$ its nominal design pressure rating according to API to completely rule out subsurface casting porosity.
Dual-Direction Seat Leakage Verification: Seating boundaries are subjected to high-pressure liquid and low-pressure pneumatic seal testing to ensure absolute tight closure before packing.
Disc Dynamic Swing Diagnostics: The internal swing assembly is manually and mechanically cycled multiple times to check for smooth clearance, perfect concentric seat alignment, and immediate closure kinematics under zero-line pressure conditions.
