A Waterjet Pneumatic Actuator Assembly, Normally Closed, is a component within a waterjet system designed to control the movement or operation of certain mechanisms using pneumatic (air) pressure.

Key aspects of the assembly include:

1. Actuation Function: The pneumatic actuator is a device that transforms air pressure into mechanical motion. In a "normally closed" configuration, it remains in a closed or resting position when no air pressure is applied.

2. Controlled Movement: When air pressure is supplied, the actuator responds by initiating movement, controlling various functions or mechanisms within the waterjet system.

3. Safety and Control: These assemblies are crucial for managing specific components or systems, ensuring they operate as intended within the waterjet setup.

4. Integration: Designed to integrate seamlessly within the waterjet system, these assemblies are compatible with the system's pneumatic controls.

5. Applications: Used in various parts of the waterjet system where controlled movements or operations are required, such as controlling the opening or closing of valves, activating specific components, or managing the movement of parts within the system.

In a "normally closed" configuration, the assembly maintains its default position when there's no air pressure, only activating or moving when pneumatic pressure is applied, providing controlled and regulated movement within the waterjet system.