Marine & Offshore

Classification-approved valves for shipboard systems and offshore installations

Marine and offshore applications demand valves that meet classification society type approval, withstand the corrosive effects of seawater and salt atmosphere, and perform reliably in confined machinery space installations. Euro Flow Control supplies bronze and cast-iron marine valves to JIS and EN standards, with available type approval from DNV, ABS, Lloyd's Register and Bureau Veritas.

Classification and type approval

Most shipboard valves on class-regulated vessels require type approval from the classification society specified in the build contract. Type approval confirms that the valve design has been independently tested against the relevant standard — typically for pressure integrity, shutoff performance and material traceability. Where class notation requires it, individual valves may also require a works certificate (3.1 or 3.2) or witnessed testing.

Euro Flow Control can supply valves with existing type approval documentation from DNV GL, ABS, Lloyd's Register and Bureau Veritas. For enquiries requiring specific class certificates, include the classification society and notation in your RFQ.

JIS-standard valves

Japanese Industrial Standard (JIS) flanged valves are specified on most vessels built to Japanese or Korean yard practice, and on many European-built vessels where the owner specifies a Japanese registry. JIS B2301 and B2302 define dimensions and pressure ratings (JIS 5K, 10K, 16K) that differ from EN 1092-1 and ASME B16.5, so mixing standards on a single system requires care with flange compatibility.

Our JIS range includes butterfly, gate, globe, check and ball valves in cast iron and bronze, across JIS 5K and JIS 10K ratings.

Quick-closing and safety valves

International Maritime Organisation (IMO) regulations require quick-closing valves on fuel oil tank outlets and certain other service tanks in machinery spaces. These valves must be operable from outside the space — typically via a mechanical wire release or pneumatic actuation — allowing the tank to be isolated rapidly in a fire or flooding event.

Storm valves, chest valves and mud boxes serve the sea chest and overboard connections: storm valves prevent ingress when the ship rolls and the connection is submerged; chest valves provide the primary sea-suction shutoff inside the ship.

Material selection for seawater service

Bronze CC491K (gunmetal) is the standard body material for seawater-wetted valves in marine service. Its tin-copper-zinc alloy composition resists dezincification and biofouling in both salt and brackish water. Cast iron and ductile iron are acceptable for internal freshwater and low-corrosion service but should not be used on seawater-wetted lines without appropriate coating or cathodic protection.