Reciprocating compressor performance curve

A recycle valve is needed for surge control as well as for the conditions listed above for reciprocating compressors. At constant speed the head-capacity relationship will vary in accordance with the performance curve. For a constant compressor speed ... 

A typical performance curve of a centrifugal compressor in terms of head against flow is shown in Figure 6. Typical performance curves for axial compressor and reciprocating or rotary compressor are also shown in Figure 6. 

The performance curve of a rotary compressor is showii in Figure 6. This curve is a slanted siniight line just the same as the one for a reciprocating oompiressor. Therefore, a relief valve is usually required to protect the compressor and Its discharge piping. 

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