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Help CenterClass 200 Threaded Swing Check Valve | NPT/BSPT Stainless Steel Non-Return Valve | Shaanxi Gold-Stone
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Class 200 Screwed End Swing Check Valve
Full-Bore Fluid Transmission & Low-Resistance Backflow Prevention
SHAANXI GOLD-STONE I/E CO., LTD. manufactures and supplies premium Class 200 threaded swing check valves designed for maximum fluid efficiency and dependable backflow prevention in industrial pipeline networks. Featuring a heavy-duty swing-type disc mechanism, these valves automatically open with forward fluid velocity and close under gravity and reverse flow pressure to deliver a tight shut-off. Precision-engineered using premium investment casting (lost wax process), our check valves offer flawless mechanical strength, smooth interior walls for minimal pressure drop, and superior corrosion resistance.
Key Engineering Features
Full-Bore Flow Architecture
The swing check design allows the disc to deflect completely out of the flow stream under pressure. This creates a straight-through, full-bore path that minimizes turbulence and friction loss, resulting in significantly lower pressure drop compared to lift or disc check valves.
Precision Investment Cast Construction
High-integrity casting for the body and cap guarantees exact wall thickness, eliminates pinhole defects, and provides heavy-duty structural strength suitable for frequent thermal cycling.
Global Thread Compatibility
Precision-machined threaded ends are available in NPT, BSPT, DIN, and ISO standards, ensuring a gas-tight mechanical joint and effortless integration into localized industrial piping layouts.
Robust Integral Seating & Swing Arm
The rugged internal hinge pin and self-aligning disc are engineered to withstand continuous pounding and rapid directional fluid shifts, maintaining zero-leakage alignment over extended operational lifetimes.
Tight Chemical Isolation
Available in low-carbon and standard 300-series stainless steels to handle volatile process chemicals, corrosive hydrocarbons, and high-purity steam without material degradation.
Technical Specifications & Standards Compliance
Our engineering and quality inspection protocols strictly conform to major international valve and thread criteria.
Parameter |
Specification / Compliance Standard |
Design & Manufacture |
ASME B16.34 / Integrated Valve Engineering Standard |
Pressure Rating |
Class 200 (Suitable for WOG – Water, Oil, Gas applications) |
Thread Connection Options |
NPT (ANSI B1.20.1) / BSPT (BS 21, DIN 2999) / G Thread (ISO 228/1) / ISO 7-1 |
Inspection & Pressure Testing |
API 598 (Mandatory shell, backseat, and closure leakage testing) |
Size Range Availability |
1/4" – 3" (DN8 – DN80) |
Body & Cap Construction |
ASTM A351 Investment Casting |
Flow Orientation |
Horizontal lines or Vertical lines (Upward flow only) |
Material Selection Guide
Shaanxi Gold-Stone delivers tailored metallurgical solutions to meet your chemical and thermodynamic processing needs.
ASTM A351 CF8 (304 Stainless Steel)
Excellent all-round performance for utility steam loops, industrial water treatment, HVAC lines, and light chemical fluid distribution.
ASTM A351 CF8M (316 Stainless Steel)
Molybdenum-fortified alloy providing elite resistance against chloride stress corrosion, pitting, organic acids, and aggressive marine environments.
Application Environments
Chemical Processing Plants
Protecting chemical feed pumps, blending stations, and aggressive fluid processing lines from hazardous backflow.
Oil & Gas Pipeline Auxiliary Skids
Reliable reverse-flow isolation in low-pressure gas loops, fuel conditioning lines, and pump lubrication systems.
Industrial Water & Wastewater Systems
Preventing media contamination in filtration skids, commercial reverse osmosis (RO) systems, and water supply lines.
Steam, Air & Boiler Circuits
Integrated into condensate return lines, compressor discharge piping, and saturated steam circuits where minimal flow resistance is required.
Technical FAQ for Procurement & Engineers
When should I choose a swing check valve over a wafer disc check valve?
Swing check valves should be specified when your piping system requires maximum flow capacity and minimum pressure drop. Because the disc swings entirely out of the flow path, it provides an unobstructed bore ideal for low-pressure or high-flow applications. Wafer disc check valves are more suitable for compact installations where space savings are critical.
What are the strict limitations for installing a swing check valve vertically?
A threaded swing check valve can only be installed vertically when the fluid flows upward. Downward-flow installation will cause gravity to hold the disc open, eliminating backflow protection and causing immediate bypass.
What does the Class 200 rating mean for stainless steel valves?
Class 200 typically represents a pressure-temperature service rating suitable for industrial WOG (Water, Oil, Gas) applications, commonly associated with 200 psi saturated steam service or higher cold working pressures depending on temperature conditions.
What test documentation is supplied with Shaanxi Gold-Stone check valves?
Every valve batch undergoes rigorous pressure containment and seat leakage testing according to API 598 standards. Certified EN 10204 3.1 Mill Test Reports (MTRs) are available upon request to validate chemical composition and mechanical properties.
About the Global Supplier
SHAANXI GOLD-STONE I/E CO., LTD. is a premier global supplier of heavy-duty industrial valves and fluid control solutions. Leveraging advanced metallurgy, precision manufacturing, and strict quality control systems, we deliver durable, corrosion-resistant valve technologies that optimize pipeline efficiency worldwide.
Contact our engineering team today for custom CAD drawings, material consultation, or direct project RFQs.
Send Inquiry to This Supplier
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