What type of valves are used for refrigerant recovery?

The correct answer is the use of self-sealing valves and a tank of appropriate pressure rating for refrigerant recovery. Self-sealing valves are designed to securely contain refrigerants, minimizing the risk of leaks during the recovery process. These valves automatically seal once the refrigerant is disconnected, which helps to prevent the release of harmful substances into the environment and ensures compliance with regulations regarding refrigerant handling.

Using a tank of appropriate pressure rating is crucial, as refrigerant can exist in both gas and liquid states and can be under high pressure depending on the type of refrigerant and environmental conditions. The pressure rating ensures that the tank can safely accommodate the refrigerant during recovery without the risk of bursting or leaking.

Additionally, while other options include various types of valves, they lack some of the safety and efficiency features necessary for effective refrigerant recovery. Manual valves, for instance, require careful handling to prevent leaks, and automatic discharge valves may not provide the same level of reliability and control as self-sealing valves. Options like single-use valves do not offer the same sustainability and practicality for this process, as they cannot be reused or may not fit the varied requirements of different recovery scenarios.