Badger Meter CV Series - Manual (Page 5)

Form #4-20-23 11/10 Page 5
Straight Pipe Run Requirements - CV, VBR
Preso CV and VBR Model Venturi elements can be installed in any position with minimal straight
pipe run requirements. The recommended minimum lengths for these models are 5 pipe diameters
upstream and 2 pipe diameters downstream.
Selecting a Mounting Location
The primary Venturi station can be installed in any position on vertical or horizontal lines. However,
on horizontal liquid lines where the risk of gas/gas entrapment in the meter tubing is prevalent, it
is recommended to install the element with the connections below the horizontal center line. For
horizontal air or gas lines, it is recommended to install the element with the connection above the
horizontal centerline. For steam lines, to protect the transmitter, it is recommended to install the
element so that the connections are in the horizontal centerline on meters with the instrument
taps in the same plane. See Figure 5 for meters with instrument taps that are not in the same
plane. Make sure that the fl ow arrow or the indicated inlet is correctly oriented. Other positions are
acceptable provided proper venting of the secondary element is accomplished and diff erences in
tap line elevations are considered.
Vertical installations may introduce a slight hydrostatic head eff ect, which must be considered
when zeroing a transmitter. The use of a 3-valve manifold is recommended particularly for zeroing
a transmitter.
Before installation of any Venturi element, inspect for damage, particularly at the sealing surfaces.
Any damage should be reported to Preso as soon as possible. Each fl ow element has an arrow
indicating the required direction of fl ow. Failure to properly orient the Venturi element according
to the direction of fl ow will cause improper results.
For Venturi elements supplied with lifting rings, the installer should take care to ensure the
connections are in the desired position for their application. Thus, supplied lugs location may not
be appropriate for all applications and may require other means of lifting.
WARNING:
Never exceed the maximum pressure or temperature recommended for the measured
process. Exceeding proper pressure or temperature ratings can lead to personal injury
or equipment damage. The process piping fl anges should be identical to those on the
Venturi. The process temperature and pressure should never exceed those for which
the element has been designed.