Accessing Sealed Systems
Small appliances are hermetically sealed, so technicians need special access methods to recover refrigerant. Piercing valves (also called self-sealing valves, line tap valves, or saddle valves) are clamped onto the refrigerant tubing to create a service port. Process stubs, which are straight pieces of copper tubing brazed onto the compressor housing at the factory, provide another common access point.
Piercing valves clamp onto tubing to create access; process stubs are factory-installed copper tubes on the compressor.
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