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CB/T 4233 Marine Deck Valve

CB/T 4233 Marine Deck Valve

The CB/T 4233 Marine Deck Valve is a manually operated, flanged-end globe valve designed and manufactured in full compliance with the Chinese shipbuilding industry standard CB/T 4233 (Marine deck valve). It is purpose-built for shipboard piping systems exposed to harsh marine environments, including open decks, pump rooms and ballast lines. The valve reliably controls seawater, freshwater, fuel oil, lubricating oil and other compatible shipborne fluids. By adhering strictly to this standard, every valve delivers verified strength, tight shut-off and long service life, meeting the rigorous demands of classification societies and ship operators.

Overview

1 Design and Configuration

  • Type: Straight pattern, globe-type deck valve.

  • Connection: Flanged ends in accordance with CB/T 4196 (marine flange standard) or equivalent ISO / GB dimensions.

  • Stem arrangement: Outside screw and yoke (OS&Y) for sizes generally above DN65; inside screw for smaller sizes, ensuring clear indication of open/closed position and protecting the stem thread from direct exposure to the fluid.

  • Bonnet: Bolted bonnet design, enabling easy access for in-situ maintenance.

  • Seating: Renewable seat and disc rings, allowing economical servicing without replacing the entire valve body.

2 Materials of Construction
Material grades are selected per CB/T 4233 requirements and tailored to the service medium:

  • Body & Bonnet: Cast steel (e.g., ZG230-450), cast copper alloy (e.g., ZCuSn10Zn2 bronze) or stainless steel (316/CF8M) as an option.

  • Stem: Corrosion-resistant martensitic stainless steel or aluminium bronze.

  • Disc & Seat Rings: Bronze or stainless steel, ensuring a durable, leak-proof metal-to-metal seal.

  • Handwheel: Cast iron or aluminium alloy, ergonomically sized for manual operation.

3 Nominal Size and Pressure Ratings

  • Size range: DN15 – DN300 (larger sizes available upon request).

  • Pressure rating: PN6, PN10, PN16 and PN25, corresponding to ship piping service classes.

  • Medium temperature: Up to the limits defined for the selected material grade (typically ≤ 200°C for bronze-trimmed steel valves).

4 Inspection, Testing and Certification
Every valve is tested in accordance with the inspection rules of CB/T 4233:

  • Shell test: 1.5 times the nominal design pressure.

  • Seat leakage test: 1.1 times the nominal design pressure.

  • Acceptance criteria: Zero visible leakage on the body-bonnet joint and packing area; seat leakage within the limits specified for marine globe valves.

  • Certificates of conformity, material mill test reports and pressure test records can be provided to meet flag state and classification society surveys.

5 Surface Protection and Marking

  • Anti-corrosion treatment: The external surfaces are shot-blasted to Sa 2½, then coated with a marine-grade epoxy or alkyd primer and finish. Standard colour is ship grey; custom colours are available.

  • Permanent marking: Each valve is permanently marked on the body with the manufacturer’s name or trademark, nominal pressure (PN), nominal size (DN), material identification and heat/lot number for full traceability.

  • Packaging: Flange faces are fitted with protective covers, and valves are securely packed in wooden crates or pallets with vapour-phase corrosion inhibitor packaging for ocean freight.

6 Optional Accessories

  • Limit switches or valve position indicators for remote monitoring.

  • Locking devices on the handwheel for safety-critical services.

  • Extended spindles with deck stand and indicator for valves installed below raised deck plates.


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