Libra Valves India Pvt. Ltd.

Leading Manufacturer of industrial valves for
Oil & Gas, Petrochemical, Power and Water Treatment

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Plug Valves

Parameter Specification
Valve Types Lubricated, Non-Lubricated, DBB Plug, Twin-Seal Plug
Size Range 2" to 36" (50 mm to 900 mm)
Pressure Class Class 150, 300, 600, 900, 1500
Design Standard API 6D, API 599
End Connection Flanged End (RF/ RTJ), Butt-Weld End
Operation Manual Handwheel, Gear-operated, Electric or Pneumatic Actuated

Overview

LIBRA Valves India Pvt. Ltd. manufactures high-performance Plug Valves, engineered for reliable isolation, tight shut-off, and long operational life in demanding process applications. Our Lubricated, Non-Lubricated, and Double Block & Bleed (DBB) Plug Valves comply with API 6D and API 599 standards, making them suitable for Oil & Gas, Refinery, Petrochemical, Power, Chemical, Fertilizer, LNG, Marine, and Water Treatment industries.
Plug valves offer quick quarter-turn operation, bubble-tight sealing, and are ideal for high-pressure, high-temperature, and corrosive service applications.

Design Highlights

LIBRA Plug Valves are engineered for reliable isolation, smooth operation, and long-term durability in demanding process applications. They are designed as per API 6D and API 599 standards with attention to operational safety, high performance, and ease of maintenance.

  • Lubricated Design: Special injection ports allow the introduction of high-quality grease or oil between the plug and seat, ensuring smooth quarter-turn operation, reduced torque, and minimal wear under high-pressure service. Ideal for heavy-duty pipelines with frequent operation.
  • Non-Lubricated Design: Advanced plug and seat materials, such as metal-to-metal or PTFE-coated surfaces, provide long-term sealing without the need for external lubrication, reducing maintenance requirements in critical pipelines.
  • Double Block & Bleed (DBB) Option: DBB plug valves provide positive isolation from both upstream and downstream, with a bleed port to release cavity pressure. This ensures process safety, accurate testing, and maintenance without line shutdown.
  • Quarter-Turn Operation: The 90° rotation mechanism allows quick opening and closing, saving time and reducing manual effort or actuator size.
  • Bubble-Tight Shutoff: Precision-machined plugs and seats provide zero leakage, maintaining process integrity and safety in high-pressure and hazardous fluid service.
  • Fire-Safe Construction: Certified as per API 607 / API 6FA, ensuring tight sealing and valve integrity even under fire exposure, suitable for critical hydrocarbon and industrial installations.
  • Anti-Blowout Stem: Designed to prevent the stem from ejection under high pressure, enhancing operator safety and reliability in pressurized pipelines.
  • High-Performance Seat Materials: Wide selection of soft and metal-seated options including PTFE, RPTFE, Devlon, Nylon, Stellite, Tungsten Carbide, or other hard-facing materials for abrasive, corrosive, or high-temperature services.
  • Corrosion & Abrasion Resistance: Body and plug materials can be coated or overlaid with FBE, PU, epoxy, hard metal, or Inconel, providing durability in harsh chemical and seawater environments.
  • ISO 5211 Mounting Pad: Direct actuator mounting compatibility enables automation-ready operation, including pneumatic, electric, or hydraulic actuation.
  • Trunnion & Floating Plug Variants: For large-diameter or high-pressure applications, design variants reduce operating torque and allow smooth rotation even in heavy-duty pipelines.
  • Compact & Modular Design: Modular body construction facilitates maintenance and inspection without removing the valve from the line, reducing downtime and operational costs.
  • High-Cycle & Severe-Service Options: Designed for frequent operation and automated control, suitable for metal-seated, fire-safe, cryogenic, or sour service applications.
  • Optimized Flow & Minimal Pressure Drop: Plug geometry and internal flow path are engineered for low resistance, minimizing energy loss in high-volume pipelines.

Versatile Solutions

LIBRA Plug Valves are engineered to provide maximum flexibility, reliability, and performance across a wide range of industrial applications. With multiple design options, pressure ratings, materials, and end connections, our valves are suitable for pipelines operating under extreme pressure, temperature, and media conditions.

  • Design Options:
  • Lubricated Plug Valves for smooth operation under high-pressure, high-cycle conditions.
  • Non-Lubricated Plug Valves with advanced soft or metal-seated designs for minimal maintenance.
  • Double Block & Bleed (DBB) Plug Valves for positive isolation and safe maintenance.
  • Side-Entry and Top-Entry configurations for ease of maintenance and inspection.
  • Pressure Ratings: Available from Class 150 to Class 2500 (PN 10 to PN 420), suitable for low-pressure utility lines as well as critical high-pressure pipelines.
  • Temperature Range: Designed for service conditions from –196°C (cryogenic LNG/LPG) to +815°C (high-temperature steam, hydrocarbons, and chemical processing).
  • End Connections: Flanged (RF/RTJ), Butt-Weld (BW), Socket Weld (SW), and Threaded Ends for versatile pipeline integration.
  • Size Range: From ½” to 60” (DN 15 to DN 1500), covering instrumentation lines to large-diameter trunk pipelines.
  • Material Options: Carbon Steel, Stainless Steel, Duplex, Super Duplex, Alloy Steel, Inconel, Hastelloy, Monel, and NACE-compliant trims.
  • Seal Variants:
  • Soft-seated (PTFE, RPTFE, Devlon, Nylon, PEEK) for low-leakage, chemical, and corrosive media.
  • Metal-seated (Stellite, Tungsten Carbide, Chrome Carbide) for abrasive, high-temperature, or severe-service conditions.
  • Coatings & Surface Treatments: FBE, Epoxy, PU, Inconel overlays, hard chrome, or Tungsten coatings for corrosion and abrasion resistance.
  • Automation Ready: ISO 5211 mounting pad for direct actuator integration, supporting pneumatic, electric, or hydraulic operation with accessories like limit switches, positioners, and gearboxes.
  • Testing & Compliance: 100% hydrostatic and pneumatic testing as per API 598 & API 6D, ensuring bubble-tight shutoff and operational reliability.
  • Specialized Configurations: Anti-blowout stem, anti-static devices, emergency sealant injection systems, and DBB/Double Isolation & Bleed options for critical safety applications.

LIBRA Plug Valves are thus designed to adapt to diverse process conditions, offering reliability, safety, and longevity in the most demanding pipelines and industrial setups.

Beyond Standards

LIBRA Plug Valves are engineered not only to meet API 6D and API 599 standards but to exceed them in performance, reliability, and operational safety. Through precision engineering, advanced materials, and stringent quality control, our valves deliver unmatched operational excellence across Oil & Gas, Petrochemical, Refinery, Power, and Chemical industries.

  • Enhanced Sealing Performance: Advanced plug and seat designs provide bubble-tight shutoff under fluctuating pressures and temperatures, ensuring zero leakage and process integrity.
  • Reduced Operating Torque: Optimized plug geometry, combined with lubricated or precision-machined non-lubricated seats, reduces the torque required to operate the valve, improving actuator efficiency and reducing operational costs.
  • High-Grade Surface Finish: Precision machining of plugs, seats, and internal body surfaces ensures smooth rotation, minimal wear, and consistent sealing over extended service periods.
  • Robust Cavity Pressure Management: DBB and lubricated designs maintain safe cavity pressure, preventing body distortion and reducing the risk of plug sticking or operational failure.
  • Severe-Service Compatibility: Available with metal-seated, hard-coated, fire-safe, cryogenic, and sour-service trims, enabling operation in abrasive, corrosive, high-temperature, and low-temperature applications.
  • High Life-Cycle Design: Engineered for frequent operation and automated processes, ensuring reliability in high-cycle applications such as pipeline isolation, pigging systems, and critical process lines.
  • Precision Machined Components: CNC-machined plugs, stems, and seats guarantee consistent quality, interchangeability, and long-term durability, reducing maintenance and replacement costs.
  • Advanced Corrosion & Abrasion Protection: Multi-layer coatings, hard-facing, and overlay options ensure the valve performs reliably in seawater, chemical, or sour hydrocarbon environments.
  • Custom Engineering Flexibility: Valves can be tailored for non-standard sizes, special media, sour service, and extreme environmental conditions, providing client-specific solutions beyond conventional standards.

Features That Add Value

LIBRA Plug Valves are designed not just for basic isolation but to deliver superior operational performance, reduced maintenance, and long-term reliability. The valves combine precision engineering, high-quality materials, and advanced design features to provide maximum value across diverse industrial applications.

  • Low Operating Torque: Optimized plug, stem, and seat geometry reduces the torque required for operation, making valves easier to operate manually or with smaller actuators.
  • Bubble-Tight Shutoff: Precision-machined plug and seat surfaces ensure zero leakage, enhancing process efficiency and safety even under high-pressure and high-temperature conditions.
  • Extended Seat Life: High-performance materials for both soft and metal-seated designs (PTFE, RPTFE, Devlon, Stellite, Tungsten Carbide) provide longer service intervals, minimizing replacement costs.
  • Ease of Maintenance: Modular body and plug construction allows inspection and maintenance without removing the valve from the pipeline, reducing downtime and operational disruption.
  • Fire-Safe & Anti-Static Design: Fire-safe construction (API 607 / API 6FA) and anti-static devices ensure reliable operation in hazardous environments, protecting personnel and assets.
  • Reduced Fugitive Emissions: Advanced stem packing and sealing systems conform to ISO 15848 / API 624 for low or zero emissions, supporting environmental compliance.
  • Versatile Installation: Multiple end connections (Flanged, Butt-Weld, Socket Weld) and face-to-face dimensions allow easy replacement or integration into existing systems.
  • High-Cycle Durability: Engineered for frequent operation, making them suitable for automated pipelines, critical isolation systems, and high-turnover industrial processes.
  • Corrosion & Abrasion Resistance: Coatings, hard-facing, and overlay options ensure long-term performance in aggressive media, including sour hydrocarbons, seawater, and chemical processing lines.
  • Double Block & Bleed (DBB) Capability: Provides positive isolation and safe inspection/maintenance by isolating both upstream and downstream flow.
  • Cost-Effective Lifecycle: Robust materials, optimized design, and corrosion protection reduce total cost of ownership, ensuring reliable performance over decades.

Certifications & Compliance

LIBRA Plug Valves are manufactured with the highest standards of quality, safety, and reliability, ensuring full compliance with international and industry-specific certifications.

  • API Standards Compliance: Designed and manufactured in accordance with API 6D (Pipeline Valves) and API 599 (Metal Valves – Pressure Testing) to ensure safe and reliable operation in critical pipelines.
  • ASME Compliance: Pressure ratings, material grades, and mechanical design adhere to ASME B16.34, ASME B16.10, and B16.5 standards, ensuring consistent integrity and performance under severe service conditions.
  • ISO 9001:2015 Certified: Guarantees a robust quality management system covering design, manufacturing, inspection, and customer support processes.
  • ISO 14001:2015 Certified: Confirms environmentally responsible manufacturing practices, including controlled waste management and resource optimization.
  • ISO 45001:2018 Certified: Ensures a safe and healthy work environment for all personnel involved in production, assembly, and testing.
  • Fire-Safe Certifications (API 607 / API 6FA): Valves are tested and certified to maintain sealing integrity during fire exposure, ensuring operational safety in hydrocarbon pipelines and critical installations.
  • SIL-3 (Safety Integrity Level 3): Confirms high functional safety performance for automated valve operation in emergency shutdown and critical control systems.
  • Third-Party Approvals: Valves are routinely tested and certified by reputable inspection agencies such as TPI, EIL, BV, TUV, DNV, and Lloyd’s, as per project-specific requirements.
  • Complete Material & Test Traceability: Each valve includes full documentation, heat number traceability, and test certificates, ensuring compliance with global audit and regulatory standards.
  • Sour Service & Severe Environment Compliance: Optional trims and materials comply with NACE MR0175 / ISO 15156 for safe operation in sour or highly corrosive environments.
  • Emission Control Compliance: Stem sealing systems designed as per ISO 15848 / API 624 for low or zero fugitive emissions, supporting environmental regulations and safe handling of hazardous fluids.

Applications

LIBRA Plug Valves are used across a wide range of industries where reliable isolation, durability, and high-performance operation are essential. Their robust construction, fire-safe design, and precise sealing make them suitable for high-pressure, high-temperature, and critical pipeline applications.

  • Oil & Gas Pipelines:
  • Isolation of crude oil, natural gas, condensate, and multiphase pipelines.
  • Wellhead lines, gathering stations, gas distribution networks, and pig launcher/receiver installations.
  • Refineries & Petrochemical Plants:
  • Handling of hydrocarbons, steam, fuel gas, and high-temperature process media.
  • Ideal for FCC, DHDS, CCR units, distillation columns, chemical reactors, and solvent systems.
  • Chemical & Fertilizer Plants:
  • Suitable for corrosive, acidic, and toxic chemicals such as ammonia, urea, methanol, and nitric acid.
  • Used in reactor feed lines, process distribution, and continuous operation systems.
  • Power & Energy Sector:
  • High-pressure and high-temperature lines including boiler feed water, condensate, cooling water, and steam lines.
  • Applicable in coal, gas, nuclear, and renewable energy plants.
  • Water & Wastewater Treatment:
  • Isolation of raw water intake systems, pump discharge lines, desalination plants, RO systems, and cooling water loops.
  • Effective in slurry, abrasive, or chemical-laden water pipelines.
  • Marine & Offshore Applications:
  • Seawater handling, ballast systems, bilge lines, and fire-fighting networks.
  • Resistant to corrosion and suitable for offshore pipelines exposed to harsh environments.
  • Cryogenic & LNG/LPG Service: Extended stem and cryogenic bonnets allow operation in LNG terminals, storage tanks, and low-temperature pipelines down to –196°C.
  • General Industrial Applications: Used in HVAC, compressed air lines, chemical transfer, paint and adhesive lines, and automated on/off applications requiring high-cycle operation.
  • Critical Safety Applications: DBB plug valves provide positive isolation for inspection, maintenance, and emergency shutdowns.

Optional Features

LIBRA Plug Valves can be customized with a wide range of optional features to suit specific service requirements, harsh operating conditions, and specialized industrial standards.

  • Bypass / Equalizing Connections: Optional bypass or equalizing ports allow pressure balancing, smooth plug rotation, and safer maintenance operations.
  • Drain & Vent Connections: Body or cavity drain and vent ports facilitate flushing, pressure relief, and inspection during maintenance or shutdown.
  • Extended Stem / Cryogenic Bonnet: Ensures safe operation in LNG, LPG, and low-temperature applications, protecting stem packing from extreme cold.
  • Fire-Safe Construction: Compliant with API 607 / API 6FA, ensuring valve integrity and sealing under fire conditions.
  • Anti-Static Devices: Prevents static charge buildup between plug, stem, and body for safe handling of hydrocarbon or flammable media.
  • High-Temperature & Metal-Seated Options: Metal-to-metal seating, hard coatings, and fire-safe trims for abrasive, high-temperature, or severe-service applications.
  • Actuation Options:
  • Manual, gear-operated, electric, pneumatic, or hydraulic actuation.
  • Supports accessories such as limit switches, positioners, solenoid valves, and other automation components.
  • Low-Emission Packing: Designed as per ISO 15848 / API 624 to ensure fugitive emission control and environmental compliance.
  • Double Block & Bleed (DBB) Configuration: Provides positive isolation for both upstream and downstream lines, enhancing process safety and inspection capability.
  • Flush Ports & Clean-Out Connections: Ideal for slurry, polymer, or viscous fluid services, allowing easy seat and cavity cleaning.
  • Special Coatings & Linings: Options include FBE, epoxy, PTFE, hard chrome, tungsten carbide, and ENP for enhanced corrosion and abrasion resistance.
  • Severe-Service Trims: NACE MR0175 / ISO 15156 compliance ensures safe operation in sour service or chemically aggressive environments.
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