Marine butterfly valves are crucial for controlling fluid flow in shipboard systems, including ballast, oil cargo, and seawater services. These valves are designed to withstand harsh marine environments and are available in various materials like bronze and stainless steel. MIL-V-24624 specifies requirements for High Performance wafer and lug style butterfly valves used in Navy shipboard service, ensuring high performance and durability. MIL-V-22133 butterfly valves are resilient seated butterfly valves for shipboard use, with a working pressure up to 200 PSI. These standards ensure reliable operation in demanding marine applications.