CLD Series Low Pressure Diaphragm Pumps

CLD Series Low Pressure Diaphragm Pumps

CLD Series Low Pressure Diaphragm Pumps

The pneumatic diaphragm metering pump consists of a liquid chamber and an air chamber separated by a diaphragm. In the liquid chamber, the suction (inlet) and discharge (outlet) ports have check valves that control the direction of the fluid flow. A pipe nipple connects the controller to the pump air chamber. In the air chamber, the air/gas power supply from the controller enters and exhausts through the pipe nipple connector. When the controller exhausts the air/gas supply, the liquid suction pressure and the return spring force the diaphragm backwards. The diaphragm stops when the end of the diaphragm stem, which is attached to the air chamber side of the diaphragm, collides with the end of the stroke adjuster.

Features

  • Simple design
  • Easy to maintain
  • Intrinsic safety of pneumatic operation
  • Stroke length and stroke rate adjustment
  • High-flow turndown
  • Corrosion resistant construction
  • All 316 SS or TFE wetted parts
  • Ease of installation
  • Recommended for discharge pressures below 120 psi

Design Improvements

  • Higher flow rates than PD pump models
  • All PTFE diaphragms for all pump sizes
  • PTFE-coated o-rings in contact with process fluid
  • FKM o-rings in contact with air/gas supply
  • Stroke adjuster scale easier to read and set than previous diaphragm pump models
  • Check valves for 316SS  models have PTFE soft seats with 316SS balls (LD200 & D400)
  • Check valves for PTFE  models have PTFE soft seats with ceramic balls (LD200 & D400)
  • Check valves on LD100 models are PVDF with PVDF soft seats and ceramic or ruby sapphire balls
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