1. Application
Bronze Marine Deck Valves are installed on all exposed deck piping systems where corrosion immunity and spark‑free safety are paramount:

• Seawater Cooling and Fire Main Systems: Hydrant isolation valves, foam concentrate valves, and fire pump sea suction valves; bronze is mandatory for fire main valves on many naval and high‑specification merchant vessels.

• Fuel Oil and Diesel Oil Transfer: Non‑sparking isolation valves at bunker stations, fuel tank deck penetrations, and fuel transfer lines, including quick‑closing valve arrangements.

• Cargo Oil and Product Tanker Manifolds (smaller sizes): Individual tank drop‑line valves and tank cleaning supply valves, where bronze is compatible with the cargo.

• Tank Cleaning and Stripping Systems: Valves on the deck manifold supplying seawater or heated water to tank cleaning machines.

• Ballast and Bilge Systems: Manual deck‑operated isolation valves for ballast tanks and bilge line penetrations.

• Fresh Water and Potable Water Systems: Safe, lead‑free bronze alloys for drinking water loading, distribution, and sampling valves on deck.

• Compressed Air and Instrument Air: Isolation valves on deck air service lines, where bronze’s corrosion resistance prevents rust particles from entering pneumatic systems.

• Inert Gas and Venting Systems: Small‑bore valves in vent and pressure/vacuum breaker lines, benefiting from bronze’s spark‑free safety.

2. Material Specifications
All materials are selected in strict accordance with applicable international material standards (ASTM, EN, JIS, GB) and are verified by EN 10204 Type 3.1 certification:

• Body & Bonnet (Bronze Alloys):

• Gunmetal / Tin Bronze (e.g., CuSn10, CC491K, ZCuSn10Zn2 per GB/T 1176, BC6 per JIS H5111): The premier alloy for seawater and fire main service. Contains approximately 10% tin, giving excellent resistance to flowing seawater, erosion, and dezincification. Requires no external coating.

• Naval Brass / Leaded Naval Brass (e.g., CuZn39Sn1, CW719R): A high‑strength brass with tin additions to inhibit dezincification. Suitable for seawater, fuel oil, and freshwater services; slightly more economical than gunmetal while retaining excellent corrosion resistance.

• Dezincification‑Resistant (DZR) Brass (e.g., CuZn36Pb2As, CW602N): Specified where the fluid is less aggressive but marine atmosphere resistance is required. Cost‑effective for fuel oil, lubricating oil, and air services.

• Trim (Disc, Seat Ring, Gate, Ball):

• Seating surfaces are renewable and precision‑lapped from bronze, stainless steel (AISI 316), or Monel for positive metal‑to‑metal shutoff.

• Soft‑seat inserts of EPDM, NBR, PTFE, or FKM are available for bubble‑tight closure on clean fluids.

• Stem: Bronze or stainless steel (AISI 316) stem with an external acme thread (rising stem) for clear visual position indication. Polished for smooth operation and long packing life.

• Packing & Weather Sealing: Deep stuffing box packed with PTFE (for general service) or graphite (for high‑temperature and fire‑safe). An external O‑ring and wiper ring prevent water, salt, and dust ingress.

• Handwheel & Fasteners: Heavy‑duty handwheel in bronze or coated cast iron, sized for gloved operation. All external fasteners (bolts, nuts, washers) are stainless steel (AISI 316) or silicon‑aluminum bronze to prevent galvanic corrosion.

3. Technical Specifications
Our Bronze Marine Deck Valves are designed, manufactured, and tested to the most demanding international and classification society requirements:

• Valve Type & Design Standards:

• Globe & Angle Globe Valves: CB/T 4233, DIN 86058, JIS F7301 (5K) / F7302 (10K) / F7303 (16K), GB/T 587, ASME B16.34 (bronze material group).

• Gate Valves: API 603 (bronze gate), BS 5154, DIN 3352.

• Ball Valves: API 608, ISO 17292 (with bronze body).
  The exact standard is matched to your vessel’s piping specification.

• Pressure Ratings:

• Standard ratings: PN6, PN10, PN16, PN25 (EN 1092‑1 / GB/T 2501); Class 150, Class 300 (ASME B16.5); 5K, 10K, 16K (JIS B2220).

• The pressure‑temperature rating of the bronze body follows the limits defined in the applicable material group of ASME B16.34 or EN 12516‑1.

• Temperature Range:

• Bronze with PTFE packing: ‑10 °C to +200 °C.

• Bronze with graphite packing: ‑10 °C to +250 °C (subject to material pressure‑temperature derating).

• Not suitable for superheated steam above 250 °C; for higher temperatures, cast steel or stainless steel is specified.

• Seat Tightness:

• Metal‑seated: API 598 / EN 12266‑1 / GB/T 600 Rate B or better.

• Soft‑seated: API 598 / EN 12266‑1 Rate A (zero visible leakage).

• Non‑Sparking Certification: Bronze alloys are inherently non‑sparking per international standards, eliminating the risk of ignition from accidental impact — essential for tanker decks and flammable fluid services.

• Fire‑Safe Construction (optional): While bronze itself has a lower melting point than steel, a fire‑safe design with graphite packing and a metal secondary seat can be supplied for fuel oil lines to meet SOLAS Chapter II‑2 and class requirements.

• Actuation: All manual valves can be supplied with an ISO 5211 mounting pad for electric, pneumatic, or hydraulic actuation. Actuators are weatherproofed to IP65 or IP68.

• Testing & Certification:

• Every valve undergoes a hydrostatic shell test at 1.5× rated pressure and a seat leakage test at 1.1× rated pressure per API 598, EN 12266‑1, or GB/T 600.

• Full EN 10204 Type 3.1 material certificates are provided for body, bonnet, stem, trim, and all pressure‑containing components, including confirmation of dezincification‑resistant alloy composition.

• Type approval or Certificates of Conformity from all major IACS classification societies are available on request.

4. Dimension Specifications
Exacting dimensional control ensures direct interchangeability with existing deck piping and perfect watertight fit at the deck penetration:

• Nominal Size Range: DN 15 to DN 300 (NPS ½″ to 12″) as standard. Larger sizes up to DN 400 can be engineered.

• Flange Connection & Deck Mounting Standards:

• EN 1092‑1 (PN6, PN10, PN16, PN25)

• ASME B16.5 (Class 150, Class 300)

• JIS B2220 (5K, 10K, 16K)

• GB/T 2501 (PN6, PN10, PN16, PN25)

• Pipe connection flanges and the deck base flange are drilled and faced precisely to match your piping specification:

• Flange facings are flat‑face or raised‑face as required.

• Face‑to‑Face / Center‑to‑Face Dimensions:

• Globe and angle globe valves: to ASME B16.10, EN 558, DIN 86058 (angle), JIS B2002, GB/T 12221, or CB/T 4233 as applicable.

• Gate valves: to ASME B16.10 or EN 558.

• These standardized lengths guarantee a bolt‑for‑bolt fit into an existing pipe spool without any on‑board modification.

• Valve Height & Deck Operating Clearance:

• The overall height from the deck flange face to the top of the handwheel (or gearbox handwheel) is designed for comfortable standing operation, typically 800 mm to 1000 mm for smaller sizes, and with a gearbox for larger sizes.

• For larger sizes and higher pressures, a fully enclosed, grease‑filled bevel gearbox is supplied, with the gearbox handwheel positioned at a convenient working height.

• Deck Penetration Interface:

• The integrally cast base flange is dimensioned identically to the pipe connection flange, providing a uniform gasket seating surface. It bolts to the deck penetration flange using a full‑face EPDM, NBR, or PTFE gasket and stainless steel studs/nuts to create a permanent watertight seal.

• All bolt circle diameters, bolt hole sizes, and flange thicknesses are held to the exact tolerances of the applicable flange standard.

• Tolerances: All critical machined dimensions — bolt circle, bolt hole diameter, gasket seating face flatness, stem straightness, and flange alignment — are held to the strict tolerances specified in the relevant valve and flange standards.