Domestic and commercial sealed hermetic systems
Domestic refrigerators and freezers do not normally have liquid receivers but access to both high and low pressure sides of the system can be achieved by using line tap valves. Some small commercial sealed systems may well fall into this category.
Other commercial sealed systems will have liquid shut-off valves at the receiver and suction service valves at the compressor.
Reference to the reclaim/recovery unit arrangement will show how hose connections can be made.
Related posts:
Hot-Water Heating Systems
Hydronic Heating Systems:One-Pipe System
Other Automatic Controls:Switching Relays
Ventilation Principles:Mechanical Ventilation and Air Ventilation Requirements
Heating Fuels:Advantages of a Warm-Air Heating System.
Vapor Engines:Open Feed water Heater.
Drive motors:Three phase electrical connections
New and replacement refrigerants:Expanse on valve setting
Oil Burners:Single-Stage Fuel Pump