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  • Piston/diaphragm pressure switches
    , with a proof pressure of 350 psi. Switches employed as more critical compressor controls may exhibit tighter repeatability. Modern designs incorporate a flexible diaphragm that isolates the plunger and switch mechanism from external contaminants. The most widely used diaphragm materials include EPDM
  • Ammonia Pressure Measurement using Thermal Flash Protection (.pdf)
    Situation: Ammonia offers refrigeration pump and compressor manufacturers an improved efficiency over Freon based systems. However, the thermodynamic behavior of ammonia is very different from Freon. When the refrigeration pump turns on, the ammonia temperature rapidly changes from 100°F to -70°F
  • Straight Talk on Wobble-Piston Pumps
    Wobble pumps combine the best features of piston and diaphragm air pumps. Wobble pumps are available in a wide range of sizes. The Model 8003 from Rietschle Thomas weighs less than 7 oz, is rated at 12-psi maximum pressure, and has 0.11-cfm open flow. It is used in industrial gas-detection

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