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J-VALVES
Structural Features
C95800 Nickel-Aluminum Bronze Construction:The valve body is precision cast from ASTM B148 C95800 nickel-aluminum bronze (Cu9Ni6Al4Fe4Mn), with chemical composition: 8.5–9.5% Ni, 4.0–5.0% Al, 4.0–5.0% Fe and 0.8–1.5% Mn. It delivers exceptional seawater corrosion resistance, strong cavitation and erosion resistance, and effectively inhibits marine organism fouling, making it suitable for long-term submersion in seawater and medium-to-high pressure offshore environments.
Swing Type:The disc rotates around an external seat trunnion, featuring low flow resistance. It fits both horizontal and vertical pipelines with fast opening/closing and minimal water hammer effect.
Lift Type:The disc lifts vertically along the valve body centerline, offering superior sealing performance. It is designed for horizontal pipelines with a compact footprint and small installation space requirement.
Automatic On/Off Operation, No External Actuation:Opening and closing are driven solely by medium pressure differential. The disc opens under forward flow and closes against reverse flow. Manual, electric or pneumatic actuators are not required, simplifying system layout and cutting operation & maintenance costs.
Medium-to-High Pressure Flanged Connection:Both valve ends adopt RF (Raised Face) flanges conforming to ASME B16.5 Class 300 standards. For 2.5-inch Class 300 flanges: outer diameter 216 mm, bolt circle diameter 184.2 mm, 8 off M20 bolts, flange thickness 28.6 mm, guaranteeing reliable connection and tight sealing under 5.1 MPa medium-to-high pressure conditions.
Metal-to-Metal Sealing:The disc and seat adopt integral C95800 metal sealing or hardfaced overlay of Stellite alloy on sealing surfaces. The design delivers outstanding wear and erosion resistance, reliable sealing and extended service life for seawater carrying solid particles.
Anti-Marine-Fouling Design:A dense passive oxide film naturally forms on the C95800 surface to repel barnacles, algae and other marine organisms. Streamlined disc geometry minimizes adhesion points and extends maintenance intervals.
Compact & Lightweight Design:The 2.5-inch swing type valve has an overall length of approx. 290 mm and weight ranging from 8 kg to 12 kg. It enables easy installation in space-restricted areas such as ship compartments and offshore platforms, reducing costs for support structures.
Technical Specifications
Nominal Size: 2.5" (DN65)
Pressure Class: Class 300 (PN50)
Body Material: ASTM B148 C95800
Temperature Range: -29℃ ~ +425℃
Body & Bonnet: ASTM B148 C95800
Disc: C95800 / Monel K500 / 316 Stainless Steel, optional Stellite hardfacing overlay
Seat: C95800 base with Stellite hardfaced sealing surface (hardened for abrasion resistance)
Trunnion & Hinge Pin: 316 Stainless Steel / Monel K500, seawater corrosion resistant
Spring (Lift Type): Inconel X-750 / 316 Stainless Steel, resistant to corrosion fatigue
Gasket: Non-asbestos fiber gasket / PTFE / Flexible graphite
Bolts: ASTM B193 B7M / 316 Stainless Steel (seawater resistant)
Nuts: ASTM B194 2HM / 316 Stainless Steel
End Connection: RF Raised Face Flange complying with ASME B16.5 Class 300; NPT thread, socket weld or marine standard flanges available as options
Flange Face Dimensions (ASME B16.5): 2.5" Class 300 RF flange OD 216 mm, bolt circle 184.2 mm, bolt hole diameter 22 mm, 8 off M20 bolts, flange thickness 28.6 mm, raised face height 2 mm
Face-to-Face Dimensions (ASME B16.10): Approx. 290 mm for 2.5" Class 300 swing type; approx. 240 mm for lift type (subject to manufacturer’s official data)
Minimum Opening Pressure: 0.02–0.05 MPa for swing type; 0.05–0.1 MPa for lift type (varies with spring preload)
Maximum Closing Speed: Swing type can be fitted with buffer device, adjustable closing time from 0.3 s to 3 s
Design Standards: ASME B16.34, API 6D, API 594, BS 1868
Test Standards: API 598, API 6D
Application Fields
Marine Vessel Seawater Systems:Deployed on 2.5-inch medium-to-high pressure pipelines for ship ballast water, bilge water, fire-fighting seawater and cooling seawater circuits. C95800 alloy resists seawater corrosion and biofouling, prevents seawater backflow to protect pumps, and meets classification society certification requirements.
Offshore Platform Engineering:Suitable for 2.5-inch medium-to-high pressure pipelines on offshore oil platforms, FPSOs and drilling rigs for seawater lift, cooling, fire suppression and utility systems. The material withstands combined corrosion from marine atmosphere and full seawater submersion, securing system integrity against reverse flow.
Seawater Desalination Plants:Installed at high-pressure pump outlets and energy recovery unit piping of 2.5-inch RO (Reverse Osmosis), MSF (Multi-Stage Flash) and MED (Multi-Effect Distillation) desalination systems. It blocks backflow of high-pressure seawater to avoid damage to pumps and membrane modules, with Class 300 rating fully compatible with high-pressure membrane desalination processes.
Coastal Power Plants:Applied to 2.5-inch circulating cooling water, seawater flue gas desulfurization and condenser cooling pipelines at coastal thermal power stations and nuclear power plants. C95800 eliminates dezincification corrosion common to brass check valves and prevents cooling water backflow during plant shutdown.
Marine Chemical Industry:Used for 2.5-inch brine and concentrated seawater pipelines in marine chemical processes including sea salt production, bromine extraction and magnesium recovery. The alloy withstands corrosion from high-salinity solutions under medium-to-high pressure and stops reverse flow of process media.
Subsea Equipment:Fitted to 2.5-inch medium-to-high pressure control piping for subsea valve manifolds, subsea pipe headers and ROV operation panels. C95800 offers reliable resistance to seawater pressure corrosion for deep-sea service conditions.
General Industrial Service:Suitable for unidirectional flow control of corrosive media such as medium-to-high pressure seawater, brackish water and saline solutions at 2.5-inch size. It prevents reverse flow to safeguard pumps and equipment, especially for offshore and heavily corrosive working environments.
Advantages & Value Propositions
Automatic Operation with Low Maintenance:Self-actuated by medium pressure differential without external actuators. The simplified system layout reduces maintenance costs and potential failure points, ideal for unmanned offshore platform operation.
Medium-to-High Pressure Seawater Corrosion Resistance:C95800 nickel-aluminum bronze exhibits a seawater corrosion rate 1/50 of carbon steel and 1/10 of brass. A dense protective film of Al₂O₃·CuO forms naturally on its surface, delivering rust-free long-term submersion performance under Class 300 pressure with a service life exceeding 20 years.
Superior Anti-Biofouling Performance:The nickel-aluminum bronze surface naturally inhibits marine organism adhesion, avoiding disc blockage by barnacles and algae. Maintenance cycles are extended by 3–5 times, cutting costs and dry-docking frequency for marine vessels, making it ideal for permanently submerged offshore platforms.
Optional Water Hammer Mitigation:Swing type valves can be equipped with hydraulic damping buffers to slow closing velocity, cutting water hammer surge pressure by 30–50% and extending service life of pumps, valves and pipeline infrastructure.
Excellent Electrochemical Compatibility:Low galvanic potential difference with steel hulls and stainless steel piping ensures good compatibility with cathodic protection systems, eliminating galvanic corrosion, boosting overall system reliability and reducing anti-corrosion engineering expenses.
Compact Lightweight Installation:The 2.5-inch valve weighs only 8–12 kg with overall length between 240 mm and 290 mm. Flexible installation is achieved in space-limited ship compartments and platform modules, cutting pipe support and bracket costs by over 30%.
Added Value via System Protection:Effectively prevents medium backflow and protects precision equipment including pumps, compressors and membrane modules from reverse rotation and water hammer damage. It extends the overall service life of the whole system and reduces equipment failure frequency and repair expenditure.
