Check Valves for Marine & Offshore
Marine and offshore check valves must resist seawater corrosion, biofouling, and the vibration and shock loads of ship and offshore platform environments. Vajra Industrial Solutions supplies swing, dual-plate, and lift-type check valves in naval brass (C83600), gunmetal (LCC), duplex stainless (A890 2205), and super duplex (A890 2507) for ballast water, fire main, bilge, seawater cooling, and cargo transfer service — with classification society approval from DNV, Lloyd's Register, Bureau Veritas, and ABS.
Key Applications — Check Valves in Marine & Offshore
Seawater Cooling Systems
Check valves for seawater cooling water loops — sea chest to heat exchangers and overboard discharge. Naval brass (C83600) or gunmetal (LCC) for low-pressure seawater (PN 6–10). Duplex SS 316 for higher pressure and longer service life. Swing check or dual-plate configuration. DNV or Lloyd's Register type approval required for class vessels.
DN50–DN300, PN 6–25, Naval Brass C83600 / Gunmetal / A890 Duplex, DNV/LR
Fire Main and Deluge Systems
Non-return (check) valves on fire pump discharge to prevent back-flow when multiple pumps are online. Must be fail-safe — no check valve should stick open or closed. Dual-plate spring-assisted check valves are preferred for fast response. All-bronze or SS 316 to resist seawater corrosion in saltwater fire main.
DN50–DN200, PN 16–25, Bronze / SS 316, SOLAS compliant, IMO
Ballast Water Treatment
Check valves on ballast pumps, treatment system by-pass, and overboard discharge lines. Must resist seawater and ballast water chemical treatment (hypochlorite, electrolysis). Duplex 2205 or super duplex 2507 for long-term seawater and chlorine resistance. IMO-compliant ballast water management systems require type-approved valves.
DN100–DN600, PN 10–16, A890 Duplex 2205 / 2507, IMO BWMC, DNV
Bilge and Ballast Pump Discharge
Swing or dual-plate check valves on bilge pump discharge to prevent backflow into bilge. Bilge check valves must be accessible for maintenance at sea and suitable for oily water service. Cast iron with SS disc for non-seawater bilge; bronze for seawater-exposed bilge system. SOLAS and MARPOL compliance for oily water system.
DN50–DN150, PN 6–10, Cast Iron / Bronze, SOLAS / MARPOL compliant
Offshore Platform — Firewater and Topside
Dual-plate check valves for offshore platform firewater ring mains and deluge system pump packages. Compact, lightweight design critical for offshore weight budgets. API 6D certified for production process check valves on topsides. NORSOK M-630 material compliance for Norwegian Continental Shelf (NCS) service.
DN50–DN300, Class 150–600, A890 Duplex / CF8M, API 6D, NORSOK M-630, DNV
Required Certifications
Recommended Materials
Selection Factors
Technical FAQs
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Check Valves for Marine & Offshore
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