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-UF30-P1






    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.
    The Clarke PLD equipped engine has three different factory settings: 100 psi (maximum pressure held between 100-110 psi), 170 psi (maximum pressure held between 170-175 psi) and 240 psi (maximum pressure held between 240-250 psi). 
    The PLD senses sprinkler system water pressure, via a sensing line connected to the pump discharge pipe (between the pump flange and the discharge check valve), and physically moves the engine throttle to manage engine speed. 
    A PLD 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. 
    cUL Listing Pending