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 90^o elbow.