Full Internal Rubber Lined Dual Plate Check Valve

TECHNICAL DATA SHEET

Product: Full Internal Rubber Lined Dual Plate Check Valve
Type: Wafer, Dual Plate, Spring-Loaded, Full Bore

1. VALVE DESCRIPTION

This is a wafer-type, dual plate check valve designed with full internal rubber lining for maximum corrosion resistance. The entire internal flow path—including the valve body bore, disc faces, hinge pins, and spring cavities—is completely encapsulated with EPDM rubber. The base material of the body and discs is CF8M (Cast 316 Stainless Steel), combining structural strength with the chemical resistance of EPDM. This design ensures that no metallic components are exposed to the process fluid, making it ideal for aggressive chemical media such as acids, alkalis, seawater, and chlorinated solutions.

The dual plate configuration, assisted by independent springs, provides non-slam closure, low cracking pressure, and can be installed in horizontal or vertical (upward flow) pipework.

2. DESIGN STANDARDS

• Valve Design: API 594 (Wafer Type, Dual Plate Check Valve)
• Face-to-Face Dimension: API 594 (Short Pattern)
• Flange Compatibility: Flangeless wafer body installs between ASME B16.5 (Class 150/300), EN 1092-1 PN 10/16 flanges
• Pressure / Temperature Rating: ASME B16.34 (Applicable to stainless steel base material, derated per EPDM lining limits)
• Testing & Inspection: API 598
• Rubber Lining Standard: Compliant with ISO 289-1 / ASTM D412 for EPDM properties; visual inspection 100%, spark tested at 10 kV (pinhole-free guarantee)

3. TECHNICAL SPECIFICATIONS

4. MATERIALS OF CONSTRUCTION

5. KEY DESIGN FEATURES

Full Internal Lining Technology

• The CF8M valve body is completely lined internally with EPDM via a high-pressure molding and vulcanization process.
• All wetted surfaces are EPDM, including the entire disc set, hinge area, and spring compartments. The springs and hinge pins are completely sealed inside the rubber encapsulation, eliminating any exposure to aggressive fluids.

Corrosion & Chemical Resistance

• CF8M base material provides excellent structural integrity even if external corrosion is a concern, and adds secondary corrosion protection should the lining be damaged (safe-layer design).
• EPDM lining offers outstanding resistance to dilute acids, alkalis, oxidizing agents, seawater, and many chlorinated solutions. Not suitable for oils, hydrocarbons, or concentrated oxidizing acids.

Non-Slam, Low Pressure Drop

• Each disc has an independent, torsion spring. The design allows the valve to close quickly before flow reversal, preventing water hammer.
• Streamlined disc profiles ensure low pressure loss and high Cv values.

Seat Design

• The seat is integrated into both the disc and body lining, creating an EPDM-to-EPDM sealing interface. No separate seat ring is required.
• Bubble-tight shutoff at low and high pressures, with self-cleaning action due to disc movement.

6. TESTING & INSPECTION

• Hydrostatic Tests per API 598:
  • Shell Test: 1.5 × CWP at ambient temperature.
  • Seat Test: 1.1 × CWP, zero leakage acceptable.
• Lining Integrity:
  • 100% spark test (holiday detection) at 10,000 V DC.
  • Hardness test (Shore A) per ASTM D2240.
  • Adhesion test per ASTM D429.
• Documentation: EN 10204-3.1 material certificates for body/disc and lining properties, NDT reports, and final inspection certificate supplied as standard.

7. LIMITATIONS

• EPDM is not resistant to mineral oils, greases, fuels, and strong concentrated oxidizing acids (e.g., concentrated nitric acid). Please consult factory for chemical compatibility charts.
• The valve is designed for clean to slightly loaded liquids. Slurries with sharp abrasive particles may reduce lining life.

8. APPLICATIONS

Ideal for corrosive fluid check service in:

• Chemical processing plants (acids, alkalis, salt solutions)
• Chlor-alkali industry (brine, caustic soda, hypochlorite)
• Seawater cooling loops and desalination
• Wastewater treatment with chemical additives
• Mining and mineral extraction (acidic leach solutions)
• Pulp and paper (bleaching chemicals)

Note: Valve dimensions, pressure/temperature derating curves, and certified assembly drawings are provided upon order placement. The manufacturer reserves the right to modify materials and design for continuous product improvement.

GUATANTEE:

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.