Flow Governors

The Flow Governor is a protective device, installed downstream of the Flow Meter, to limit the flow rate through the Flow Meter, to the maximum Meter flow rate capacity. This becomes essential when the pump capacity is greater than the capacity of the Flow Meter or when a common pump is used for more than one Flow Meter.


  • Low pressure drop
  • Adjustable flow rate
  • Compact and rugged construction
  • A sensitive pressure differential orifice design


The Flow Governor consists of a body having an orifice, a spring balanced piston and a butterfly control valve. Variation in liquid flow across the orifice creates a differential pressure, which applies a downward or upward force on the piston. This in turn rotates the butterfly valve to restrict and maintain a constant rate of flow. The downward compression force on the piston is resisted by the spring tension, which is adjustable and enables accurate presetting of a constant flow rate.


  • Single pump, multi-point gantry filling
  • High flow regulation for meter protection