Several kinds of water meter features

1. The LXS and LXL LXS and LXL water meters belong to the 1960s. Due to the limitation of productivity, only the ordinary machine tool was used to process the impeller mould. The LXS type actually enlarges the small-diameter water meter, the blades of the impeller are vertical, the water flows from the impeller box into the impact impeller, flows out of the outlet of the impeller box through rotation and complex change direction, and then flows out of the water meter through rotation and change of direction. . Therefore, the structure is huge and the pressure loss is the greatest. LXL type is a kind of helical wing impeller. Its die is milled by ordinary milling machine to spiral surface. The structure is already a horizontal screw type. The pressure loss of the water meter is small and the circulation capacity is large, but the impeller lead is large and the grade is low. . LXS-type, LXL-type metering performance can only reach the minimum standard ISO4064 A, should be eliminated.

LXS and LXL water meters have relatively good anti-pollution capacity despite lower water bill recovery rates. LXS type has a bowl-shaped filter to prevent debris, LXL impeller blades, lead long, so resistant to block impact performance is relatively better. The old-fashioned water meter has a good reputation in the extensive water meter reading workers of the Ministry of Management, because sand and gravel are stuck less, and the water meter has a short life span and does not spend its own money. Waist bag.

2. The LXLC type LXLC is a product of the 1980s. In 1986, a full set of German technology and molds were introduced, the measurement performance reached ISO4064 B level, the minimum flow value was 2.7 times smaller than the old products, the meter diameter reached 500mm, making China's large-caliber water meter technology a qualitative leap, becoming the new leading product. . The advantages are: (1) The measurement level is improved, and the A-level is upgraded to B-level, the water fee recovery rate is increased; (2) The head loss is small, the circulation capacity is large, the pressure of the expansion of the pipe network can be reduced, the pressure of the water supply can be reduced, and the water pump can be reduced. Power consumption; (3) Detachable structure for easy maintenance; (4) Strong ability to withstand large flow and long service life; (5) Remote transmission function can be configured to facilitate management and upgrade. The disadvantages are: the structure of the water meter is precise and there is no filter net, and the antifouling performance is slightly inferior to that of the old water meter. The probability that the filaments and blocks in the pipe network catch the impeller increases, and the filter water tank should be installed when necessary.

3. WPD type WPD type is the most advanced leading product in the world. It is fully upgraded on the basis of LXLC type, with larger maximum flow, smaller minimum flow rate, smaller pressure loss, better antifouling performance. , longer service life. At present, it is produced in the form of the introduction of the German water meter movement and the domestically-made case assembly. The advantages are: (1) The water meter structure has incredible impeller dynamic balancing technology. The high speed rotating impeller is suspended like the magnetic levitation train between the front and rear impeller shafts without contact, so it is not easy to wear and can withstand large flow and maintain long-term life. Period of measurement accuracy; (2) The minimum flow is far less than the level of B, while the flow is reduced when the flow is large, so as to improve the water rate recovery; (3) can be configured to transfer functions, facilitate management and upgrade. The disadvantage is that although the antifouling performance has been improved, it is still necessary to install a filter tank if necessary.

4, WS type WS type functional products, the vertical positioning of the screw-type impeller, and comes with a filter, thereby improving the small flow performance and anti-fouling performance, more suitable for use in small-flow pipe network, its overall comprehensive performance In the LXS type, it is the LXS type replacement product. The advantages are as follows: (1) Because the vertical impeller is supported by points, the impeller has low rotation frictional resistance and superior small flow performance; (2) Self-contained filter screen, strong anti-fouling performance, and the entire movement can be pulled out during installation. , More convenient; (3) can support remote reading function. The disadvantages are: the vertical flow of the impeller leads to complex flow, which can cause damage to the movement in the case of large flow, so it is not suitable for use in large flow networks; for the same reason, the pressure loss of the water meter is relatively large, affecting the flow capacity of the water meter.

5. The LXF type LXF double water meter is a functional product. It bypasses the small-diameter water meter on the basis of the horizontal wing type water meter. Through the automatic adjustment of the flow switch valve, the water flow is passed through Small-diameter water meters or large-diameter water meters at the same time, so that the metering range of the compound water meter is extended from the minimum flow of small-caliber water meter to the maximum flow of large-caliber water meter. The turn-down ratio is 1500 to 2400 times, which is the highest in all water metering products. The maximum water rate recovery rate can be maximized. Its advantages are: (1) The maximum flow range, such as LXF-100 double water meter qmin=0.05m3/h, qmax=120m3/h, which can measure the amount of peak water consumption in a residential area to the leakage of a toilet in a household in the middle of the night. (2) In the case of large pipe network with small fire flow requirements, the double water meter can keep the pipe network in a normally open state and take into account the interests of fire protection, water use, and charges. The water company does not have to collect water for a small amount of large pipe. The trouble is that the user does not have to worry about the small water meter that is connected in parallel, which is too small and unpleasant. The fire does not have to leave a hidden danger for the normal closing of large pipeline valves. The disadvantage is that due to the damping effect of the automatic flow switching valve, the pressure loss of the water meter is increased and it is not suitable for the ultra-low pressure water pipe network.