Libra Valves India Pvt. Ltd.
Leading Manufacturer of industrial valves for
Oil & Gas, Petrochemical, Power and Water Treatment
Swing Check Valves
| Parameter | Specification |
|---|---|
| Valve Types | Bolted Bonnet Swing Check Valve / Pressure Seal Swing Check Valve |
| Size Range | 2" to 48" (50 mm to 1200 mm) |
| Pressure Class | Class 150, 300, 600, 900, 1500, 2500 |
| Design Standard | API 6D, API594, ASME B16.34, BS 1868 |
| End Connection | Flanged End (RF/ RTJ), Butt-Weld End |
Overview
LIBRA Valves India Pvt. Ltd. manufactures high-performance Swing Check Valves designed to prevent reverse flow automatically and protect pipelines, pumps, compressors, and critical equipment. These valves are widely used in Oil & Gas, Petrochemical, Power, Chemical, Water Treatment, and Pipeline Transportation sectors.
Swing Check Valves operate through a hinged disc mechanism, where the disc swings open with forward flow and closes instantly when flow reverses, ensuring non-slam performance and system protection. Available in Bolted Cover and Pressure Seal Cover designs, these valves deliver long-term reliability in medium to high-pressure service conditions.
Design Highlights
- Automatic Non-Return Function: Prevents reverse flow and protects pumps & compressors.
- Swinging Disc Mechanism: Low cracking pressure, minimal pressure drop.
- Bolted or Pressure Seal Cover: Ensures reliable sealing for varying pressure ranges.
- Renewable Seats (Optional): Stellite hard-facing for long service life.
- Full Port Construction: Ensures smooth flow and reduced turbulence.
- Horizontal & Vertical Installation: Suitable for flow-up vertical pipelines (API 6D compliant).
- Low Maintenance Design: Optimized hinge, disc, and pin assembly for smooth, noiseless movement.
Versatile Solutions
- Pressure Class: Up to Class 2500 (approx. 420 bar, material dependent)
- Temperature Range: –29°C to +450°C (higher with special trims)
- End Connection Options: RF Flanged, RTJ Flanged, Butt Weld (BW)
- Body Material Options:
- Carbon Steel (A216 WCB)
- Alloy Steel (WC6, WC9)
- Stainless Steel (CF8, CF8M)
- Duplex / Super Duplex
- Special Alloys (Inconel, Monel, Hastelloy)
- 100% Valve Testing
- Hydrostatic testing
- Pneumatic testing
- Seat leak testing (API 598)
- Coatings: Epoxy, Polyurethane, Zinc Phosphate or project-specific coatings
Beyond Standards
LIBRA Valves’ Swing Check Valves are engineered to exceed global standards through precision engineering, advanced metallurgy, and extensive testing.
Designed in compliance with API 6D and BS 1868, these valves provide long-term protection against reverse flow in critical pipeline systems.
Bolted Cover Swing Check Valve Design
- Proven construction suitable for medium to high-pressure services.
- Cover-to-body joint sealed with spiral wound gasket or ring-type joint (RTJ).
- Ideal for pipeline isolation, crude oil service, hydrocarbon transfer, water injection, and general utility lines.
- External bolting ensures easy maintenance and accessibility.
- Renewable seat rings available with hard-facing options (Stellite / Co-Cr alloy).
- Suitable for horizontal and some vertical installations.
Pressure Seal Cover Swing Check Valve Design
- Self-energizing pressure seal gasket, improving tightness as internal pressure increases.
- Designed for high-pressure, high-temperature applications:
- Superheated steam lines
- High-pressure hydrocarbon pipelines
- Thermal & nuclear power service
- High-pressure water & gas injection lines
- More compact and lighter compared to bolted cover valves in higher pressure classes.
- Engineered hinge-disc design provides improved shutoff performance and reduced slamming.
Features That Add Value
- Reliable Backflow Prevention: Quick-acting disc ensures instant closure.
- Low Pressure Drop: Streamlined flow path minimizes turbulence.
- Long Service Life: Hard-faced seats and robust hinge mechanism reduce wear.
- Wide Temperature Range: Typically –29°C to +450°C (material dependent).
- Fire-Safe Options: In compliance with API 607 / API 6FA (optional).
- Forged / Cast Construction: Available as per project specifications.
- Leak Tight Performance: Seat leakage tested as per API 598.
Certifications & Compliance
- Design & Testing: API 6D / BS 1868 / ASME B16.34
- Quality System: ISO 9001:2015
- Environmental & Safety: ISO 14001:2015, ISO 45001:2018
- Fire-Safe (Optional): API 607 / API 6FA
- Fugitive Emission (Optional): ISO 15848 / API 624
- IBR Certification: Available for steam applications
Applications
LIBRA Swing Check Valves are ideal for preventing backflow in critical systems:
- Crude oil & product pipelines
- Gas transmission & distribution networks
- Refinery and petrochemical plants
- Power plants (steam, condensate, feedwater systems)
- Chemical & fertilizer industries
- Offshore and onshore hydrocarbon facilities
- Water & wastewater management systems
- Pump discharge lines / compressor lines
Optional Features
- Dashpot arrangement for non-slam performance
- Position indicators for disc monitoring
- Drain / vent connections on body or cover
- NACE MR0175 / ISO 15156 for sour service
- Extended hinge pin arrangement
- Metal-seated or soft-seated options
- High-temperature & cryogenic designs
- Non-slam tilting disc design (API 594 type)