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VH35
VH37
VH39
4
RECEPTION
The series VH flow switches are supplied conveniently packaged for their protection during
transportation and storage, together with their instructions manual for installation and
operation.
5
INSTALLATION
For VH35 model, install the flow switch in a horizontal pipe with the hanging paddle in
vertical position and perpendicular to the flow direction. The center of the paddle-pin should
be aligned with the inner diameter of the pipe. To achieve this position, the top of the
threaded fitting should be at the following distances from the inner pipe diameter:
24 mm, if the switch is made of stainless steel (AISI 316L).
85 mm, if the switch is made of plastic (PTFE).
The paddle should be free to move without touching the pipe.
The flow switch will work with flow in both directions in a horizontal pipe.
NOTE: On request the flow switch can be supplied for mounting in a vertical pipe with
upwards flow direction (models VH37 and VH39). In this case the paddle has a stop to avoid
it from falling below the horizontal position, and the switching flow rate will be higher than the
version for a horizontal pipe.
Horizontal pipe
vertical
with upwards flow, with spring
pipe
vertical pipe with upwards flow, with magnetic spring
5
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