woltman type water meter tengyue metering
WOLTMAN TYPE WATER METERS
The Woltmann meter is mainly used in the
industrial field or for larger residential supplies. This meter is of the
helical reel type and it is made of a piece of pipe flanged at the ends in
which is inserted a measuring unit bearing an helical reel the axis of which
corresponds with that of the pipe. The reel, whose fins are arranged according
to upright helicoids, is placed in rotation by the passage of 'water. The
measuring unit can be quickly replaced for repair without the need for removal
of the main meter body. The reading mechanism with its gears is mounted inside
an hermetically closed and sealed capsule. Transmission from the reel to the
reading mechanism takes place via magnetic coupling.
Woltman
type water meters can be used for flow rates higher than Qn15 m3/h.
They are thereby distinguished by ensuring an especially low head loss, even
with high flow rates. The newly developed measuring insert with a special
construction of the turbine where the water flows through, guarantees a high
measuring accuracy and long-term stability of the measuring results. Large
number rollers on the dry dial counter ensure the readability of the numbers at
all times.
Construction principle
Similar
to multi-jet meters, Woltman meters measure the velocity of the water flowing
through with the help of a turbine. The volume is mechanically calculated,
through the known volume of the measuring chamber, and indicated with the
roller counters in cubic meters.
The
unique form of the "paddle wheels" enable the Woltman meters to cover
a very large measuring range with especially low head loss. Aside from their
construction for high flow rates, they also reliably start measuring with small
water quantities.
Construction form
In the
Parallel Woltman meters(WPH), the turbine shaft is arranged parallel to the
axis of the pipeline. The rotation of the turbine is transmitted through a worm
gear to the dry dial counter.A very large diameter range of DN40 to DN500 can
be covered with this construction. A very robust construction, little head
loss, and a large measuring range characterize the WPH.
In the
Vertical Woltman meters(WS), the turbine shaft stands perpendicular to the axis
of the pipeline. The water is deflected in an S-form and flows through the
turbine from the "bottom" to "top". The movement of the turbine
can be directly transmitted without diversion to the dry dial counter. There is
an advantage over the Parallel Woltman meters in the improved starting flow and
during fluctuating flow rates.
An
extremely large measuring range can be covered with Compound water meters.
During low flow rates, the water is only flowing through the sencondary meter.
If the flow rate increases above the switching point of the built-in valve, the
spring loaded valve opens the main arm. The water flows though the main(type WP)
and sencondary meters(type MNK). Both counters need to be added in order to
determine the meter's consumption.
The
modern construction of the Compound water meter is the Turbo Compound meter, in
which the main meter, the secondary meter and the spring loaded valve are all
assembled on the plate. The advantage is that the meter body can remain in the
piping during periodical replacement, and the calibrated measuring insert
simply needs to be interchanged. The main meter is designed as a WPH and the
secondary meter as a measuring cartridge.
A
particular construction form of the Woltman meters is the Well water meter. In
principle it is a WS meter whose body is customized to the conditions of a well
construction. The water enters on the underside of the meter, flows through the
perpendicular standing turbine and is directed out of the meter through the 90o
elbow.
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