Demand Control Valves-Help or Hindrance

摘要

Pressure-reducing devices are often put on the output side of compressed air receivers. Some claim that it is more economical to compress air to 125 psig, then reduce it to 100 psig for use in the plant. That mistaken belief is a result of misunderstanding the meanings of air compressor capacity ratings. Air compressors are rated by CFM of air intake at atmospheric pressure, not CFM output at the final pressure. Doing the calculations with the correct starting data shows that it most economical to maintain the output pressure of air compressors as low as possible to meet plant demands.