Common types of valves used in ships include gate valves, globe valves, ball valves, check valves, and safety valves. Selection should be based on the medium (water, oil, steam, etc.), pressure, temperature, and control requirements (manual/electric).

Common Types:

Gate Valve: Low fluid resistance, suitable for large-diameter pipelines carrying seawater or freshwater, but prone to seal wear.

Ball Valves: Rapid opening/closing with excellent sealing, suitable for systems requiring high sealing integrity like fuel oil transfer.

Gate Valves: Reliable sealing with precise flow regulation, commonly used in freshwater and steam systems.

Check Valves: Prevent backflow of media to protect equipment like pumps.

Safety Valves: Automatically discharge excess pressure to safeguard system integrity.

Selection Criteria:

Consider the medium: Bronze/stainless steel for seawater, cast steel for fuel oil, cast steel for steam.

Consider pressure and temperature: Cast steel for high-pressure systems, heat-resistant materials for high-temperature systems.

Consider control requirements: Select electric/pneumatic valves for frequent adjustments or remote control.

Consider function: Choose check valves for backflow prevention, globe valves/control valves for flow regulation.