The core difference between Type A and AS valves in marine applications lies in their actuators: Type A is manually operated, while AS valves feature electric actuators enabling remote control.

In terms of appearance, Type A typically features a round handle with a simple structure; AS valves incorporate an additional control panel due to their integrated electric components, resulting in a more complex overall design.

Functionally, Type A relies on manual switching; Type AS utilizes an electric actuator to precisely regulate flow and pressure while supporting remote operation, offering higher automation.

Application scenarios: Type A suits conventional manual operation environments; Type AS is primarily used in ship systems requiring remote control or automated management, such as ballast water management.