Common materials for marine valves include cast iron, cast steel, bronze, and stainless steel, each suited for specific applications and offering distinct advantages.

Cast iron (such as gray cast iron and ductile iron) offers lower cost and is suitable for low-pressure systems conveying media like water, steam, and air, though it exhibits relatively weaker corrosion resistance. For instance, Chengzhi brand marine oil and water pipeline injection fittings utilize cast iron resistant to seawater corrosion.

Cast steel (e.g., WCB) offers higher strength, making it suitable for medium-to-high pressure systems where greater pressure resistance is required. It is commonly used in shipboard steam systems. Quan Guan brand marine flanged cast steel globe check valves utilize cast steel material, suitable for media like water, gas, and oil.

Bronze (e.g., tin bronze, aluminum bronze) exhibits outstanding seawater corrosion resistance. It is frequently used in valves directly exposed to seawater, making it an ideal choice for seawater systems. Gongheng's two-way plug valves utilize solid copper construction, suitable for media like air.

Stainless steel (e.g., 304, 316L) offers superior corrosion resistance and strength, making it suitable for harsh environments, particularly in sanitary freshwater systems and food storage systems. However, it carries a relatively higher cost. Jingcheng brand marine steam trap assemblies employ cast steel construction, suitable for ship drainage systems.

Additionally, specialized valves for specific applications—such as chemical tankers—may require higher-grade corrosion-resistant alloys like duplex stainless steel or Hastelloy. For instance, HABONIM's high-pressure valves utilize specialized materials for aerospace, marine, and other high-end sectors.