TL Series PD Flow Meters (3″ to 8″)

The TL Series Positive Displacement Flow Meters are precision made liquid measuring Flow Meters. These are available in single, double and triple capsule models to suit applications covering a wide range of flow capacities. Simplicity of design and construction ensures unmatched accuracy and trouble-free operation over long periods of use.


  • Unique wear compensating vane design for sustained accuracy over a wide flow range
  • Separate meter manifold prevents pipeline stresses from being transmitted to the measuring chamber
  • Pressure balanced end covers protect distortion of measuring chamber due to line pressure
  • Modular construction ensures interchangeable parts, lower inventory of spares and ease of service
  • Stepless calibration adjustment
  • Low pressure drop
  • Mechanical or electronic readout


The product enters the Flow Meter through the manifold inlet and causes the rotor to revolve by pressure on the vane blades (see figure overleaf). The proximity of the rotor to the body forms an efficient seal, whilst the profile of the body ensures that the vane blades are guided through the measuring crescent. The vane blades divide the liquid into segments and each revolution of the rotor displaces four such segments.

Pressurised product also fills spaces between the inner and outer covers, so that the inner end covers, which form the measuring chamber, are pressure balanced and are prevented from distortion due to line pressure.

The rotor spindle transmits the drive through a pressure tight lip seal in the meter’s front cover to the pulse transmitter or the calibrating mechanism to calibrate the meter output for a corrected counter readout. A mechanical PD Flow Meters are fitted with Veeder Root counter.


  • Aviation refuelling
  • Tank truck and rail wagon gantry filling
  • Ship bunkering an barge loading
  • Refineries
  • Tank calibration
  • Test rigs
  • Blending and batching in the lube plants, process control and chemical industries
  • Microprocessor based automation, remote control and data acquisition systems