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Model 757-66-U

Level and Flow Control Valve

The Model 757-66-U Level and Flow Control Valve with Bi-Level Vertical Float is a hydraulically operated, diaphragm actuated control valve that controls reservoir filling. The valve hydraulically opens at pre-set low level and shuts off at pre-set high level. During filling, it limits the flow to preset maximum, regardless of fluctuating upstream pressure or reservoir level.

Features and Benefits

  • Line pressure driven – Independent operation
  • Bi-Level hydraulic float control
    • On/Off service
    • Low cavitation damage
    • Reservoir inherent refreshing
  • Hydraulic flow sensor (downstream installation)
    • No moving parts
    • No electronic components
    • Wide flow setting range
    • Cavitation damage protection
  • Double chamber design
    • Moderated valve reaction
    • Protected diaphragm
  • External installation
    • Easy access to valve and float
    • Easy level setting
  • In-line serviceable – Easy maintenance
  • Flexible design – Easy addition of features
     

Typical Applications

Gravity Fed Lines
Alternative solutions to accommodate the obvious pressure reducing requirements associated with high elevation differential pipelines are:

  • Pressure-reducing valves in series (see BERMAD’s publication: Proportional Pressure Reducing Valve, Model 720-PD)
  • Sequential pressure breaking reservoirs

Where pressure breaking reservoirs already exist or are specified, some issues to consider are:

  • Pipeline problems associated with line emptying and filling
  • Valve cavitation damage
  • Reservoir high pressure flow jets

The Model 757-66-U is well suited to provide the solutions to these issues.