Type I — Small Appliances第 94 / 240 题
A technician removes a bolt-on piercing valve after finishing recovery on a refrigerator. Why is leaving a piercing valve on the system long-term discouraged?
a.They are required to be brass and are too expensive to leave
b.The rubber seal can degrade and leak, releasing refrigerant into the atmosphere
c.Piercing valves increase the refrigerant charge over time
d.They convert the appliance into a Type II system
解析
Bolt-on saddle piercing valves rely on a rubber gasket that can dry out or degrade over time, creating a slow leak. Because avoidable leaks release refrigerant and waste charge, these valves are meant for temporary access. Permanent access is better made with a properly brazed process tube or a soldered access fitting.
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