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J-VALVES
Construction Features
C95800 Nickel-Aluminum Bronze Material: The body is manufactured from ASTM B148 C95800 nickel-aluminum bronze (Cu9Ni6Al4Fe4Mn), containing 8.5–9.5% nickel, 4.0–5.0% aluminum, 4.0–5.0% iron, and 0.8–1.5% manganese. It offers excellent seawater corrosion resistance, high resistance to cavitation erosion and scouring corrosion, effectively inhibits marine biofouling, and is suitable for long-term immersion in seawater.
Y‑Type Inclined Design: The body flow passage forms a 45° angle with inlet and outlet connections. Compared with T‑type strainers, flow resistance is reduced by 30–50% with low pressure loss. Under the same nominal size, it
provides a larger filtration area, extending screen cleaning intervals and improving system operating efficiency.
Removable Screen Design: The top flanged or threaded cover allows quick access. The pull‑out screen design enables online removal, cleaning or replacement without uninstalling the strainer from the pipeline, minimizing downtime and maintenance costs.
Low‑Pressure Flanged Connections: The body is equipped with RF (Raised Face) flanges complying with ASME B16.5 Class 150. For 3‑inch Class 150 flanges, the outer diameter is 190 mm, bolt circle diameter is 152.4 mm, bolt quantity is 4×M16, and flange thickness is 23.9 mm, ensuring full compatibility with standard low‑pressure piping systems.
Duplex Composite Screen: Coarse outer filtration plus fine inner filtration improves filtration accuracy and extends screen service life.
Drain & Vent: A 3/4" or 1" NPT drain connection is provided at the bottom, fitted with a ball valve or gate valve for online blowdown, removing sediment deposits without disassembly. A differential pressure gauge connection can be provided on the side to monitor screen clogging.
Marine Antifouling Design: The C95800 alloy forms a dense protective oxide layer that inhibits attachment of barnacles, algae and other marine organisms. Optional marine antifouling coating or electrolytic antifouling systems are available to further extend maintenance intervals.
Compact & Lightweight Design: The 3‑inch Y‑type unit has an approximate length of 330 mm and weighs 10–15 kg, facilitating installation in confined spaces such as ship compartments and offshore platforms, and reducing support structure costs.
Technical Parameters
Nominal Size: 3″ (DN80)
Pressure Class: 150LB (PN20)
Body Material: ASTM B148 C95800
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM B148 C95800
Screen Basket: 316 Stainless Steel / C95800
Screen Material: 304 / 316 / 316L stainless steel woven wire mesh or perforated plate
Gaskets: Non‑asbestos fiber / PTFE / Flexible graphite
Studs: ASTM B193 Grade B7M / 316 Stainless Steel (seawater corrosion resistant)
Nuts: ASTM B194 Grade 2HM / 316 Stainless Steel
Drain Valve: C95800 ball valve or gate valve (same material as body)
End Connections: Flanged (RF), ASME B16.5 Class 150; optional NPT threaded, socket weld or marine‑standard flanges
Flange Facing Dimensions: ASME B16.5
Design Standard: ASME B16.34
Test Standard: API 598
Applications
Marine Seawater Systems: Used in 3‑inch pipelines for ship ballast water, bilge water, firewater and cooling seawater systems. The C95800 material resists seawater corrosion and biofouling, removing shells, algae, sediment and other impurities to protect pumps and valves.
Offshore Platform Engineering: Applied in 3‑inch seawater lift, cooling, firewater and utility systems on offshore oil platforms, FPSOs and drilling rigs. It withstands both marine atmospheric and immersed seawater corrosion, ensuring safe operation of platform equipment.
Seawater Desalination Plants: Installed at the intake of feed pumps and high‑pressure pumps in RO (Reverse Osmosis), MSF (Multi‑Stage Flash) and MED (Multi‑Effect Distillation) systems for 3‑inch pipelines, removing suspended solids and colloids to protect precision membrane elements and high‑pressure pumps.
Marine Chemical Industry: Used in 3‑inch brine and concentrated seawater pipelines for seawater salt production, bromine extraction, magnesium extraction and similar processes, resisting high‑concentration salt solution corrosion and removing crystalline salt deposits and impurities.
General Industrial Service: Suitable for impurity filtration in 3‑inch low‑pressure pipelines conveying seawater, brackish water, salt solutions and other corrosive media, especially in marine and highly corrosive environments.
Advantages & Value
Excellent Seawater Corrosion Resistance: The corrosion rate of C95800 nickel‑aluminum bronze in seawater is only 1/50 that of carbon steel and 1/10 that of brass. A dense Al₂O₃·CuO protective film forms on the surface, providing rust‑free service for over 20 years under continuous immersion, eliminating frequent replacement and coating failure risks of carbon steel strainers.
Superior Antifouling Performance: The nickel‑aluminum bronze surface discourages marine organism attachment, reducing screen clogging by barnacles and algae. Maintenance intervals are extended by 3–5 times, lowering dry‑docking cleaning frequency and costs, especially for long‑immersed offshore platforms.
High‑Efficiency Y‑Type Low‑Pressure Loss Filtration: The 45° inclined design reduces flow resistance by 30–50%, with effective filtration area ≥3 times the pipe cross‑section. Low pressure loss and high flow capacity extend cleaning intervals and reduce pumping energy consumption.
Electrochemical Compatibility: Small galvanic potential difference with steel hulls and stainless steel pipelines ensures good compatibility with cathodic protection systems, avoiding galvanic corrosion, improving overall system reliability and reducing anti‑corrosion engineering costs.
Compact, Lightweight Installation: The 3‑inch Y‑type unit weighs only 10–15 kg with an approximate length of 330 mm, enabling flexible installation in confined spaces such as ship compartments and platform modules, reducing pipe rack and support costs by over 30%.
Added Value for System Protection: Effectively removes impurities from seawater to protect downstream pumps, valves, heat exchangers, membrane elements and other precision equipment, extending overall service life and reducing equipment failure and maintenance costs.
