Adjusting the load with the return bypass valve of a reciprocating compressor
Thread Content
May I ask: when the return bypass valve of a reciprocating compressor is fully open, does the compressor operate under no load or with some load? Since the pipeline connected to the return bypass valve is thinner than the outlet pipeline, will some gas be compressed rather than allowing the compressor to operate completely under no load? Please advise! ! !
1 In a system with a bypass line, the compressor outlet pressure, the backpressure in the downstream circuit, and the pressure drop across the bypass line together determine a pressure balance. 2 When the bypass line is fully open, if the compressor outlet pressure is higher than the backpressure in the downstream circuit (including pipe resistance), fluid will flow in that direction. 3 When the bypass line is fully open, if the compressor outlet pressure is lower than the backpressure in the downstream circuit (including pipe resistance), no fluid flows in that direction; all fluid returns to the compressor inlet. 4 The diameter of the pipes is not the only factor involved; it depends on the pressure balance
Check the pressure at the compressor outlet; if the outlet pressure remains stable once the check valve is fully open and does not increase, it indicates that the compressor is running under no load. If the pressure continues to rise until it reaches normal levels, then there is some load applied to the compressor