Figure 7-23. - Cross section of an open type of reciprocating compressor.

Figure 7-24. - Small semisealed compressor.

circulation at low oil pressure may be provided by slingers, screw type of devices, and the like. Splash and other types of oil feed must hot be considered inferior forced feed. With good design, they lubricate well. It is most important to maintain the proper oil level, use a correct grade of oil, and keep the system clean and free of dirt and moisture. This is true for all compression refrigeration systems, especially those equipped with

Figure 7-25. - Vertical semisealed compressor.