Clarke PLD...good under pressure!


  • Specification Sheet 
  • Power Curve
  • Installation & Operation Data
  • Material/Construction 
  • Installation Drawing
  • Emission Data
  • Noise Data

  • Proposal 

  • Operations Manual
  • Wiring Diagrams 
  • General Data  
  • NFPA20 Reference Data  
  • Parts 
  • PLD Piping Schematic 
  • Warranty
  • Language Translation Pages


  • JU6H-UFADR0-D  





    The Clarke PLD equipped engine is a UL/FM* certified diesel engine fire pump driver which reduces pump speed to limit the maximum pump discharge pressure to prevent over-pressurization of the sprinkler system.
    Clarke PLD-D equipped electronic engine models can be Factory Set to limit discharge pressure at any specific pressure between 100 psi and 350 psi. (Note: This Factory Set point is not field adjustable).
    The PLD-D senses sprinkler system water pressure via a transducer installed in a sensing line connected to the pump discharge pipe (between the pump flange and the discharge check valve), and speed changes are accomplished by the engine ECM (Electronic Control Module).
    A PLD-D model engine requires a controller equipped with visible and audible alarms to comply with NFPA 20 (2003) Par (8).
    When using a Clarke PLD equipped engine, NFPA 20 (2003) requires the installation of a pressure relief valve.