PSU

The acronym PSU in the context of pneumatics most often stands for Pneumatic Safety Unit or Pneumatic Power Supply. The specific meaning depends on the context and manufacturer. 1. Pneumatic Safety Unit (PSU) ?? When referring to a specific component, PSU often means a Pneumatic Safety Unit. Function: This is a safety assembly typically used to isolate and quickly exhaust compressed air from a machine or system in an emergency. Key Features: Lockout/Tagout: Provides a mechanism to manually lock off the air supply, preventing accidental restart during maintenance (meeting OSHA/safety standards). Quick Dump/Exhaust: Simultaneously dumps the downstream air pressure to zero very quickly when activated (e.g., via an E-Stop button), causing pneumatic actuators and components to stop moving almost instantly. Restart Prevention: Ensures the machine will not automatically restart when the main air supply is restored until an operator manually resets the safety unit. 2. Pneumatic Power Supply (PSU) ?? In a general system context, it can refer to the Pneumatic Power Supply section. Function: This term collectively describes the group of components that generate, prepare, and deliver compressed air to the rest of the pneumatic system. Components: While not a single valve, the "Pneumatic Power Supply" includes: Compressor: Generates the compressed air. Receiver Tank: Stores the compressed air. Air Preparation Unit: Often an FRL (Filter-Regulator-Lubricator) unit that cleans, regulates, and lubricates the air before it enters the control circuit.