CTS Velocity Balancing Valve Installation

Pipe Spool with Sampling Points

Butterfly Valve

  • The Velocity Balancing valve is a unidirectional device. The direction of the flow must be aligned with the flow direction arrow as affixed to the valve body.
  • Butterfly valves should always be installed downstream of the Venturi and as per manufacturers installation recommendations. Appropriate gasketing material must be used when installing flange mounted butterfly valves.
  • Velocity inlet flange connection requires a flange gasket to seal to the inlet pipe work flange, bolt tension should be as per ASME specifications.
  • CTS Velocity can be installed in pipe work horizontally or vertically.
  • To ensure measuring accuracy, a minimum of 5 x diameter of straight pipe should be installed upstream of the CTS Velocity.
  • Generally, installation of a Y strainer upstream of a control valve, terminal unit or balancing valve is recommended, straight piping requirements prior to the balancing valve need to be considered.
  • The elimination of air from the working fluid is required to promote thermal conductivity, quiet operation and the best system efficiency / system performance.
  • Valves are ordered by line size. Flow rates are set by adjusting the butterfly valve via lever until the differential pressure reading across the valve corresponds with the required flow (GPM).
  • A calibrated differential pressure gauge or balancing computer will be required to record the differential pressure across the venturi test points enabling the calculation / reading of flow.
  • After balancing is completed the Velocity balancing valve set position can be locked in place by tightening the B-fly memory stop in position. The butterfly valve can then be closed if maintenance to the terminal unit the B-fly memory stop.
  • Valve identification, differential Pressure, open position and calculated flow can be recorded as part of a balancing report, an important reference for future maintenance or diagnostics.