1. Application
Cast Steel Marine Deck Valves are specified where high pressures, high temperatures, large diameters, or critical safety requirements demand superior material strength and impact resistance:

• Cargo Oil and Chemical Tanker Manifolds: High‑pressure isolation valves on deck manifolds, drop lines, and crossovers for crude oil, products, and aggressive chemicals.

• Ballast Water Systems: High‑capacity, deck‑operated ballast suction, discharge, and stripping valves in deep‑draft vessels and offshore platforms.

• Fire Main and Foam Systems: Large‑diameter deck isolation valves for fire pumps, monitors, and deluge systems, often in sizes up to DN 600 and Class 300.

• Fuel Oil Bunker and Transfer Stations: Manual and quick‑closing valves for heavy fuel oil and diesel oil loading and transfer, with fire‑safe construction as mandatory.

• Steam and Thermal Oil Lines: Deck valves for steam deck distribution headers, tank heating coil supply, and thermal oil heater isolation, rated for superheated steam up to 425 °C.

• High‑Pressure Deck Washing and Tank Cleaning Lines: Valves handling seawater at elevated pressures for tank cleaning machines and deck washdown.

• Inert Gas and Venting Systems: Valves on the inert gas deck main and pressure/vacuum breaker lines where fire‑safe construction is required.

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 (Cast Steel Grades):

• ASTM A216 Grade WCB: The standard carbon steel casting for valves up to Class 600 and temperatures from -29 °C to +425 °C. Excellent weldability and widely available.

• EN 1.0619 (GP240GH): European equivalent for pressure‑containing steel castings, per EN 10213.

• JIS SCPH2: Japanese standard carbon steel casting for pressure parts, per JIS G5152.

• GB ZG230‑450: Chinese standard cast steel, per GB/T 11352.

• For low‑temperature service (down to -46 °C), ASTM A352 LCC or EN 1.0566 (G20Mn5) is supplied. For high‑temperature creep‑resistant applications, alloy steels such as ASTM A217 WC6/WC9 are available.

• Corrosion Protection System:

• All external surfaces are blast‑cleaned to SA 2½ (near‑white metal) and coated with a multi‑layer marine protection system: a zinc‑rich epoxy primer (providing cathodic protection), followed by a high‑build amine‑cured epoxy intermediate coat and an aliphatic polyurethane topcoat resistant to UV and salt spray. Total dry film thickness is typically 250–350 µm.

• Alternatively, for valves up to DN 150, hot‑dip galvanizing to ISO 1461 can be applied, metallurgically bonding a zinc layer to the steel.

• Trim (Disc, Seat Ring, Gate, Ball):

• Seating surfaces are manufactured from corrosion‑resistant materials: stainless steel (AISI 410, 316), Monel, or hard‑faced with Stellite for high‑temperature steam and erosive services. All trim is renewable.

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

• Stem: Stainless steel (AISI 410 or 316) with an external acme thread (rising stem) for clear visual position indication. The stem is polished and surface‑treated for low friction and long packing life.

• Packing & Weather Sealing: Deep stuffing box packed with multiple rings of graphite (for high temperature and fire‑safe) or PTFE. An external O‑ring and wiper ring prevent water, salt, and dust ingress. Grease fittings allow in‑situ lubrication.

• Fasteners: All external bolting (bonnet, gland, flange) is stainless steel (AISI 316 or A4‑80) to prevent atmospheric corrosion.

3. Technical Specifications
Our Cast Steel 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: ASME B16.34, DIN 86058, JIS F7311, GB/T 586, CB/T 4233.

• Gate Valves: API 600, API 603, DIN 3352, BS 5154.

• Ball Valves: API 608, ISO 17292 (floating or trunnion, fire‑safe).
  The exact standard is matched to your vessel’s piping specification.

• Pressure Ratings:

• ASME: Class 150, Class 300, Class 600 (ASME B16.34 / B16.5).

• EN/DIN: PN10, PN16, PN25, PN40 (EN 1092‑1).

• JIS: 10K, 16K, 20K (JIS B2220).

• GB: PN10, PN16, PN25, PN40 (GB/T 2501).
  Higher ratings up to Class 900/PN63 are available on request.

• Temperature Range:

• Standard WCB/GP240GH with graphite packing: ‑29 °C to +425 °C.

• Low‑temperature LCC with PTFE packing: ‑46 °C to +200 °C.

• Alloy steel WC6/WC9 with graphite packing: up to +540 °C for steam service.

• Seat Tightness:

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

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

• Fire‑Safe Construction (optional): API 607 / ISO 10497 certified design with graphite packing, metal secondary seat, and anti‑static grounding, mandatory for fuel oil and flammable cargo valves per SOLAS Chapter II‑2.

• Actuation: All 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.

• 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 the vessel’s deck penetration standard:

• Nominal Size Range: DN 50 to DN 600 (NPS 2″ to 24″) as standard. Larger sizes up to DN 1200 (NPS 48″) can be engineered.

• Flange Connection Standards:

• EN 1092‑1 (PN10, PN16, PN25, PN40)

• ASME B16.5 (Class 150, Class 300, Class 600)

• JIS B2220 (10K, 16K, 20K)

• GB/T 2501 (PN10, PN16, PN25, PN40)

• 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:

• Gate valves: to ASME B16.10, EN 558, JIS B2002, or GB/T 12221, as applicable.

• Globe & angle globe valves: to ASME B16.10, EN 558, DIN 86058 (for angle), CB/T 4233 (for deck mounting).

• Ball valves: to ASME B16.10 or EN 558 Series 1.

• 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 1200 mm.

• For large sizes and high 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 or fabricated deck 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.