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Peristaltic vs. Diaphragm Pumps

Peristaltic pumps and diaphragm pumps are both types of positive displacement pumps, which means they move a fixed amount of fluid with each cycle. However, they operate on different principles and have distinct advantages and applications. Here are the key differences between peristaltic pumps and diaphragm pumps:

1. Operating Principle:

  • Peristaltic Pumps: Peristaltic pumps use rotating rollers or shoes to compress a flexible tube or hose. As the rollers move along the tube, they squeeze the fluid through the tube in a peristaltic (wave-like) motion. The pump creates a vacuum at the inlet, allowing the fluid to be drawn into the tube.
  • Diaphragm Pumps: Diaphragm pumps use a flexible diaphragm, typically made of rubber or other flexible materials, to create a chamber that expands and contracts. When the diaphragm contracts, it creates a vacuum, drawing the fluid into the pump. When the diaphragm expands, it pressurizes the fluid and forces it out of the pump.