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Help Center1PC Wafer Disc Check Valve PN16/PN40 | Stainless Steel Non-Return Valve | Shaanxi Gold-Stone
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1PC Wafer Disc Check Valve – PN16 / PN40
Ultra-Compact Backflow Prevention & Low Pressure Drop Fluid Control
SHAANXI GOLD-STONE I/E CO., LTD. manufactures and supplies premium 1PC wafer disc check valves (non-return valves) rated for PN16 and PN40 pressure classes. Engineered for high-efficiency backflow prevention in space-restricted piping systems, these valves utilize an integrated disc-and-spring mechanism to deliver immediate, tight shut-off upon reverse flow. Precision-manufactured via investment casting, our wafer check valves eliminate structural weak points while offering maximum corrosion resistance and structural durability.
Key Engineering Features
Ultra-Compact Wafer Design
The short face-to-face dimensions allow seamless installation between pipeline flanges. This drastically reduces overall system weight, lowers installation costs, and minimizes space requirements compared to traditional flanged swing check valves.
Advanced Investment Casting Body & Cap
High-precision casting guarantees uniform wall thickness, zero internal porosity, and exceptional pressure containment under rapid cyclic operations.
Optimized Hydrodynamic Disc Profile
Engineered to achieve a low cracking pressure and stabilized fluid flow, maximizing flow capacity while minimizing line pressure drop and turbulence.
Spring-Assisted Fast Closure
The integrated heavy-duty stainless steel spring facilitates rapid disc closure prior to flow reversal, effectively mitigating water hammer and protecting upstream pumps and instrumentation.
Metal-to-Metal or Soft Seating Options
Available with robust metal seating for high-temperature durability or resilient soft seating (VITON/PTFE) for bubble-tight sealing at low differential pressures.
Technical Specifications & Standards Compliance
Our engineering and quality assurance processes strictly comply with international valve manufacturing standards.
Parameter |
Specification / Compliance Standard |
Design & Manufacture |
ASME B16.34 / EN 12516 |
Face-to-Face Dimensions |
EN 558 Series 49 / DIN 3202-K4 |
Flange Compatibility |
EN 1092-1 PN16 / PN40, ASME B16.5 Class 150/300 |
Pressure & Temperature |
ASME B16.34 / EN 12516-1 |
Inspection & Testing |
API 598 / EN 12266-1 (Zero-leakage testing) |
Nominal Pressure Rating |
PN16 / PN40 (Class 150 to Class 300 equivalent) |
Size Range Availability |
DN15 – DN150 (1/2" – 6") |
Installation Orientation |
Horizontal or Vertical (Upward flow only) |
Material Selection Guide
Shaanxi Gold-Stone delivers customized alloy configurations designed to withstand diverse chemical and thermal stresses.
ASTM A351 CF8 (304 Stainless Steel)
The industry standard for utility lines, industrial water processing, steam service, and general chemical environments.
ASTM A351 CF8M (316 Stainless Steel)
Molybdenum-enriched stainless steel offering high resistance to chloride pitting, volatile organic acids, and harsh marine environments.
High-Performance Internal Components
Internal disc and springs are precision-machined from SS316 to ensure high fatigue resistance and permanent elastic stability during rapid cycling.
Application Environments
Water & Wastewater Treatment
Preventing backflow in high-pressure desalination lines, municipal water distribution, and wastewater pumping stations.
Chemical Processing Plants
Secure containment and protection of precise dosing pumps handling aggressive process fluids or acids.
Oil & Gas Pipeline Auxiliary Lines
Compact reverse-flow protection in fuel gas systems, nitrogen purging loops, and lubrication skids.
Industrial Utility Lines
Widely integrated into steam lines, condensate return systems, and HVAC water circuits where space efficiency is critical.
Technical FAQ for Procurement & Engineers
What are the main operational benefits of a wafer disc check valve compared to a swing check valve?
Wafer disc check valves are significantly lighter and more compact than conventional swing check valves, often saving over 70% in weight and installation space. The spring-assisted closure also enables much faster shut-off, effectively reducing water hammer before reverse flow velocity can develop.
Can this wafer check valve be installed in a vertical pipeline?
Yes. Shaanxi Gold-Stone wafer disc check valves can be installed in both horizontal and vertical pipelines. For vertical installations, the fluid flow direction must be upward to ensure correct disc reseating.
What does “cracking pressure” mean, and why is it important?
Cracking pressure is the minimum upstream differential pressure required to open the valve disc against the internal spring force. A low cracking pressure minimizes energy loss while ensuring rapid opening and immediate shut-off when reverse flow occurs.
What test documentation is supplied with Shaanxi Gold-Stone check valves?
Every valve batch undergoes shell and seat pressure testing in compliance with API 598 or EN 12266-1 standards. Full EN 10204 3.1 Mill Test Reports (MTRs) are available for complete chemical and physical material traceability.
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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