VH Series Tecfluid - GRM Válvulas e instrumentación
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Tecfluid VH Series


Tecfluid VH Series

Flow switch and indicator for liquids and gases

Tecfluid VH Series


  • Suitable for clear, opaque or turbid liquids (series AD & VH),and for gases (series AD)
  • Flow switching by means of magnetic coupling, watertight,no contact between process fluid and switching, indicator or transmitter systems
  • Suitable for installation in horizontal or vertical pipes
  • Robust construction
  • Scales available for H2O, air, oil, etc. (series AD)
  • Flow rate (for liquids):
    • Series AD: 0.25 … 270 l/min
    • Series VH: 2 … 120 m3/h
  • Accuracy for series AD: ±5% f.s.
  • Connections:
    • Series AD: ¼” … 2 ½” BSP / NPT
    • Series VH: G1 / 1” NPT, to be inserted on a DN32 … DN500 pipe
  • Materials:
    • Series AD: EN 1.4404 (AISI 316L), aluminium, brass
    • Series VH: EN 1.4404 (AISI 316L), PTFE
  • Flow switching:
    • 1 reed switch (series AD & VH)
    • 2 reed switches (only series AD)
    • 1 or 2 inductive switches (only series AD) All switches for series AD are ATEX Ex ia IIC T4…T6 Ga / Ex ia IIIC T85ºC Da certified
  • Options for model ADI15:
    • Local flow indication
    • Electronic transmitter with 4-20 mA output for safe or hazardous area (Ex ia IIC T4…T6 Ga / Ex ia IIIC T85ºC Da protection, ATEX certified). HART protocol available on request


Working principle

A spring M keeps a disk B in zero flow rate position. When the fluid flows through the disk at a specific speed, a force is made on the disk B, moving it to an equilibrium position. The distance covered by B depends on: – The force of the fluid flow F. – The relationship between areas A & B. – The force in opposition of the spring C. The equilibrium between forces F and the one generated by C defines the position of the disk B, equivalent to flow rate. The disk B, which contains a magnet M, acts over the switches and/or the local indicator.

Serie VH Tecfluid


  • Machine or processes cooling
  • Hydraulic and lubrication circuits
  • Thermal oil circuits
  • Gas flow control
  • Mechanical fasteners cooling control


  • AD15 with one or two reed switches
  • ADI15 local flow indication optionally with:one or two reed switches
    • one or two inductive switches
    • 4-20 mA transmitter


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