What is one of the main parts of a refrigerant reciprocating compressor that is not included in the following options?

In a refrigerant reciprocating compressor, the primary components include various parts that facilitate the compression process. The compressor operates by using pistons to compress the refrigerant within a cylinder, and these pistons are connected to connecting rods, which are essential for converting the rotational motion of the crankshaft into linear motion. The compressor also includes suction and discharge valves, which allow for the proper flow of refrigerant in and out of the cylinder.

While blades are an integral component in other types of compressors, such as centrifugal compressors, they are not present in reciprocating compressors. This makes the inclusion of blades in the multiple-choice options misleading, as they do not play a role in the operation of a reciprocating compressor. Instead, the main mechanical parts that direct the compression process are indeed the suction and discharge valves, the pistons and connecting rods, and the compressor bearings, which support the moving parts and reduce friction.