Libra Valves India Pvt. Ltd.
Leading Manufacturer of industrial valves for
Oil & Gas, Petrochemical, Power and Water Treatment
Dual Plate Check Valves
| Parameter | Specification |
|---|---|
| Valve Types | Dual Plate – Retainer/ Retainerless Design, Single Plate – Retainer/ Retainerless Design |
| Size Range | 2" to 72" (50 mm to 1800 mm) |
| Pressure Class | Class 150, 300, 600, 900, 1500 |
| Design Standard | API 6D, API 594 |
| End Connection | Wafer End, Lugged End, Flanged End (RF/ RTJ), Butt-Weld End |
Overview
LIBRA Valves India Pvt. Ltd. manufactures robust and high-performance Dual Plate Check Valves designed to prevent reverse flow in pipelines with maximum efficiency and minimal pressure loss. Our valves comply with API 594 & API 6D standards and are widely used in Oil & Gas, Petrochemical, Refinery, Power, Chemical, Marine, and Water Treatment industries.
The Dual Plate Check Valve uses a spring-loaded, dual-plate (wafer type) design, providing quick closure, reduced water hammer, and long operational life.
Design Highlights
- Compact Dual-Plate Design: Lightweight, low-profile construction suitable for tight installations.
- Spring-Assisted Closure: Ensures fast shutoff and minimizes water hammer.
- Independent Plates: Allow balanced operation and smooth opening even at low flow velocities.
- Torsion Springs (Inconel optional): Provide reliable seating and extended life under high-cycle operations.
- Streamlined Body: Ensures very low pressure drop, improving pipeline efficiency.
- Shock-Resistant Stop Pin & Hinge System: Prevents plate over-travel and reduces impact loads.
- Positive Seal: EPDM, NBR, Viton, PTFE, or metal-to-metal options for various services.
- Replaceable Seat Options: Available for enhanced maintenance flexibility.
- Self-Actuated: No external power or operator required.
Versatile Solutions
- Design Options: Dual Plate and Single Plate Check Valves available in Retainer and Retainerless designs
- Performance: Engineered for high performance, reliability, and flexibility across industrial applications
- Pressure Range: Up to 2500# Class (approx. 420 bar / 6000 psi) depending on design and material
- Temperature Range: –196°C to +815°C for cryogenic, high-temperature, and general process services
- Configurations: Wafer, Lug, and Double Flanged Types
- End Connections: Flanged (RF / RTJ) or Butt-Weld (BW) options
- Sizes Available: DN 50 mm to DN 3000 mm (2” to 120”)
- Testing: 100% tested as per API 598 and API 6D (hydrostatic, pneumatic, and seat leakage tests)
- Corrosion Protection: Coatings include epoxy, polyurethane, zinc phosphate, FBE, or 3-layer PE
- Optional Internal Coatings: For seawater or chemically aggressive media
- Installation: Suitable for compact installations and high-flow systems
- Advantages: Provides reliable operation, low maintenance, and exceptional adaptability for demanding industrial applications
Beyond Standards
LIBRA Valves’ Dual Plate Check Valve are engineered to exceed global standards through superior design, precision machining, and advanced testing.
Single Plate (Swing Check) Design
The Single Plate Check Valve—also known as a Swing Check Valve—is designed with a single disc that swings open with forward flow and automatically closes to prevent reverse flow. This design is simple, robust, and ideal for applications requiring minimal pressure drop and reliable closure.
- Simple & Proven Mechanism: Single moving part reduces maintenance and enhances reliability.
- Full Bore Flow Path: Provides very low pressure drop and excellent flow characteristics.
- Suitable for Low-Velocity Flow: Performs well in applications where flow rates fluctuate or remain low.
- Wide Size Availability: Commonly used for medium to large pipeline diameters.
- Metal-to-Metal or Soft Seat Options: Suitable for both clean media and slightly contaminated fluids.
- Applications: Water treatment plants, refinery utility systems, pump discharge lines, irrigation networks, and cooling water systems.
Dual Plate (Double Door) Design
The Dual Plate Check Valve is engineered for high performance and efficiency. Two spring-loaded plates pivot on a central hinge system, providing quick closure and significantly reducing water hammer. This design is compact, lightweight, and energy-efficient.
- Fast Closing Action: Spring-assisted mechanism ensures immediate closure, preventing backflow and reducing pipeline stress.
- Compact and Lightweight: Requires less space and offers easy installation between flanges.
- Low Pressure Drop: Streamlined flow path and dual-door geometry reduce energy loss.
- High Cycle Life: Designed for continuous and high-frequency operations in critical service conditions.
- Versatile Configurations: Available in Wafer, Lug, and Double Flanged designs.
- Applications: Oil & gas pipelines, chemical processing, marine systems, power plants, and high-pressure utility services.
Wafer Type Design
The Wafer Type Check Valve fits easily between standard pipeline flanges, offering a cost-effective, space-saving solution. Suitable for both Single Plate and Dual Plate configurations.
- Lightweight & Compact: Reduces installation time and pipeline load.
- Cost-Effective Construction: Uses minimal materials while maintaining high performance.
- Low Pressure Drop: Smooth internal geometry optimizes flow characteristics.
- Ideal for General Services: Cooling water, HVAC, process utilities, chemical lines, and moderate-pressure applications.
Lug Type Design
The Lug Type Check Valve includes threaded lugs for secure bolting and enhanced structural strength. Available for both Single Plate and Dual Plate designs.
- Supports Dead-End Installation: Allows safe operation even when downstream piping is removed.
- High Mechanical Rigidity: Suitable for pipelines subjected to vibration or mechanical loads.
- Safer Maintenance: Enables partial system shutdown without disturbing the entire line.
- Common Uses: Offshore platforms, energy plants, firewater systems, and industrial utility networks.
Double Flanged Type Design
The Double Flanged Check Valve is the most robust configuration, suitable for large diameter or high-pressure service. Offered in both Single Plate and Dual Plate mechanisms.
- Superior Structural Strength: Ensures uniform load distribution and stable pipeline integration.
- Highly Reliable Seal: Ideal for high-pressure, high-temperature, or critical fluid applications.
- Perfect for Large Pipelines: Enhanced rigidity and easy alignment during installation.
- Industry Applications: Refineries, oil & gas trunk lines, thermal power plants, desalination units, and heavy-duty process systems.
Features That Add Value
- Low Pressure Drop: Aerodynamic design minimizes flow resistance.
- High Integrity Seating: Soft seat or metal seat options for Zero/Low leakage.
- Material Flexibility: Carbon steel, Stainless steel, Duplex, Super Duplex, Alloy steel available.
- Corrosion Resistance: Internal coatings available for seawater, brine, or corrosive chemicals.
- High Cycle Life: Designed for long life in continuous operation pipelines.
- Fire-Safe Options: Available as per API 6FA / API 607 if required.
- Fugitive Emission Compliance: ISO 15848 low-emission designs available on request.
- High Temperature & Cryogenic Options: For LNG, LPG, and steam applications.
Certifications & Compliance
- Design & Testing: API 594, API 6D, API 598
- Pressure-Temperature Rating Standard: ASME B16.34
- Retainerless Design Compliance: MSS-SP-125
- Quality Management System: ISO 9001:2015
- Environment & Safety Management: ISO 14001:2015, ISO 45001:2018
- Functional Safety: SIL-3 Certified
- Fire Safe Certification: API 607 / API 6FA (optional, for both Single Plate & Dual Plate)
- Fugitive Emission Compliance: ISO 15848 / API 624
- IBR Certification: Available for steam service applications
Applications
LIBRA Dual Plate Check Valves are used across a wide range of industries where reliable isolation is critical:
- Oil & Gas Pipelines – Backflow prevention and reliable isolation of crude oil, natural gas, and condensate lines (Dual Plate – Retainer/Retainerless, Single Plate – Retainer/Retainerless)
- Refineries & Petrochemical Plants – Process isolation and utility systems for high-temperature and corrosive media
- Thermal & Nuclear Power Plants – Main steam lines, boiler feed lines, condensate return, and turbine systems
- Chemical & Fertilizer Plants – Handling corrosive, acidic, and high-temperature fluids
- Water & Wastewater Treatment Plants – Flow control, pump discharge lines, and isolation for treatment systems
- Marine & Offshore Installations – Seawater, ballast, cooling water systems, and other critical marine pipelines
- HVAC & Utility Systems – Low-pressure circulation, chilled water, and process utility lines
- Cryogenic & LNG/LPG Pipelines – Backflow protection in extreme low-temperature applications (Dual Plate – Retainerless preferred)
Optional Features
- Bypass / Equalizing Connection – For pressure balancing and controlled flow during maintenance
- Drain & Vent Connections – On body or cover for easy inspection, testing, or flushing
- Stem / Hinge Sealing with Live-Loading Springs – Ensures long-lasting leak-tight operation
- Position Indicators – For actuator-mounted valves, providing visual feedback of valve status
- Sour Service Compliance – NACE MR0175 / ISO 15156 certification for corrosive hydrocarbon environments
- Cryogenic Extensions – For extremely low-temperature service, including LNG/LPG pipelines
- Soft Seat Options – EPDM, NBR, Viton, PTFE for low-leakage applications
- Anti-Slam / Controlled Closure – For Dual Plate valves to prevent water hammer
- Fire Safe Construction – Available for high-temperature or critical safety applications