Service Valves

Fig 1: Identifying Service Valves

Courtesy of VOLVO CARS OF NORTH AMERICA.

1. Service valve for emptying and vacuum pumping.
2. Service valve for emptying, vacuum pumping and filling of refrigerant.

The service valves are used for:

• checking the system through manometer connections
• draining the system of refrigerant
• vacuum pumping
• filling of refrigerant, which normally takes place on the low pressure side but can also take place on the high pressure side in an orifice system such as this.