When using equipment that has Schrader valves, which statements are considered critical?

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Schrader valves on service ports must be kept in good condition and protected, because a damaged or depressed valve core can cause refrigerant leaks or loss of containment. Inspecting the valve core for bends and breakage is important because even minor damage can prevent the core from seating properly, leading to leaks during recovery, charging, or testing. If the core is damaged, replacing it prevents leakage and maintains a tight seal on the service port. Capping the Schrader ports is also essential to prevent accidental depression of the valve core, which could occur when hoses or gauges come into contact with the port or during handling; the cap also helps keep dirt and moisture out, which can impair valve operation. Taken together, these steps protect the system from refrigerant loss and ensure safe, reliable servicing. All of the above statements are therefore critical.