This series of water meters are used to measure the total volume of cold (hot) water flowing through the tap water pipe and realize prepayment functions: valve closing for arrears, tiered water price, etc.
Main Technical Parameters
Diameter
L
L1
W
H1
H2 Connection thread
Connection thread
mm
d
D
15
258
165
90
120
200
R1/2
G3/4B
20
299
195
90
120
200
R3/4
G1B
25
345
225
90
120
200
R1
G1-1/4B
32
452
328
99
206
253
R1-1/4
G1-1/2B
40
485
355
119
222
269
R1-1/2
G2B
50
575
406
143
255
302
R2
G2-1/2B
Diameter
Water meter L1
Valve L2
Total L
H
Outer diameter D1
Center distanceD2
Connecting bolts
mm
n-M
50
200
220
420
335
165
125
4-M16
65
200
220
420
345
185
145
4-M16
80
225
300
525
375
200
160
8-M16
100
250
340
590
415
220
180
8-M16
125
250
350
600
460
250
210
8-M16
150
300
400
700
525
285
240
8-M20
200
350
440
790
560
340
295
8-M20(1.0Mpa)
12-M20(1.6Mpa)
250
450
550
1000
660
395
350
12-M20(1.0Mpa)
405
355
12-M24(1.6Mpa)
300
500
640
1140
800
445
400
12-M20(1.0Mpa)
460
410
12-M24(1.6Mpa)
Nominal diametermm
Metering characteristics
Q4 Overload flow
Q3 Nominal flow
Q2Demarcation flow
Q1Mini flow
Minireading
Maxreading
m3/h
m3
15
R100
3.125
2.5
0.04
0.025
0.00005
99.999
20
5
4
0.064
0.04
0.00005
99.999
25
7.875
6.3
0.1
0.063
0.00005
99.999
32
12.5
10
0.16
0.1
0.00005
99.999
40
20
16
0.256
0.16
0.00005
99.999
50
31.25
25
0.4
0.25
0.00005
99.999
50
R50
31.25
25
0.8
0.5
0.0005
999.999
65
50
40
1.28
0.8
0.0005
999.999
80
78.75
63
2
1.26
0.002
999.999
100
125
100
3.2
2
0.002
999.999
125
200
160
5.12
3.2
0.002
999.999
150
312.5
250
8
5
0.002
999.999
200
500
400
12.8
8
0.002
999.999
250
787.5
630
20.16
12.6
0.02
9999.999
300
1250
1000
32
20.16
0.02
9999.999
Features
DN15-25 adopts integrated meter and valve structure, with the same size as ordinary water meters, which is easy to replace and upgrade;
DN32-50 adopts independent meter and valve structure, modular production, and easy maintenance;
DN15-50 and above all use rotary vane water meter as the measuring carrier, ball valve suspension structure, small switching torque, long service life, anti-blocking, no leakage;
DN50-300 uses LXLC series water meter as the measuring carrier, pilot valve control, advanced structure, always clear reading, small pressure loss, easy installation and maintenance;
One card one meter, encryption protection; automatic valve closing protection under strong magnetic interference;
Multiple user types are optional, three-step water volume and unit price can be set to be compatible with single rate billing.
Selection, installation and Use
It is recommended that the expected flow rate should be adapted to the Q1 to Q3 flow rate of the water meter. Do not select a water meter based solely on the pipe diameter without considering the common flow rate.
The water meter should be prevented from being subjected to excessive stress caused by pipes and fittings, no part should be displaced due to its own gravity.
The water meter should be installed horizontally, with the arrow on the meter case consistent with the direction of water flow in the pipe. Control valves should be installed upstream and downstream of the water meter, and the inlet and outlet valves must be fully open during use. At the same time, expansion joints or soft neck joints should also be considered to be installed downstream of the water meter to facilitate the removal or maintenance of the water meter.
To ensure that the water meter can work for a long time and measure accurately, the water meter and the pipe should always be filled with water.
If there is a possibility that air can enter the water meter, a vent valve should be installed upstream of the water meter.
The installation location of the water meter should be protected from exposure to the sun, freezing, pollution and flooding. In high-cold areas, water meters should be installed outdoors as much as possible. If water meters must be installed outdoors, sun protection and anti-freeze measures should be taken to prevent the water meter from being exposed to the sun or cracked due to freezing, affecting normal use. Avoid sudden changes in the flow cross-section near the water meter.
Measures should be taken to prevent adverse hydraulic conditions (cavitation, surge, water hammer) to prevent water meter damage.
Before installing the water meter, sand, gravel, hemp and other debris in the pipe must be removed. When installing the water meter, pay attention to the connection length of the water meter. When the distance between the two ends of the pipe exceeds the connection length of the water meter, the distance between the pipes should be corrected to meet the connection length of the water meter. Otherwise, if the distance is too large and the installation is forced, the water meter connection flange will break and be damaged. If the distance is too small, the water meter cannot be installed. If the two ends of the water meter are not on the same axis, other methods should be used to correct the pipes to be on the same axis to meet the installation requirements of the water meter.
When installing a water meter, it should be installed on a straight pipeline. Do not install the water meter at a height position that changes suddenly. Generally, a straight pipe section with the same diameter (D) as the water meter and a length of 10D and 5D should be installed upstream and downstream of the water meter. In particular, the straight pipe section installed upstream of the water meter should be as long as possible and should be installed between the control valve and the water meter.If this cannot be guaranteed, a straightening device should be installed upstream. When installing the water meter, the level should be checked to avoid working in an inclined state, may cause inaccurate measurement. At the same time, sudden changes in the flow section near the water meter should also be avoided.
During long-term use of the water meter, in order to prevent sand, gravel and other debris from entering the water meter and affecting its accurate measurement or causing damage, a filter with the same nominal diameter as the water meter should be installed behind the water meter control valve. The filter should be removed and cleaned frequently, and impurities accumulated in the filter should also be removed to ensure accurate measurement of the water meter.
It is recommended to close the control valve upstream of the water meter or install a check valve at the water inlet end of the water meter when the water meter is not in use.
If the water meter or its accessories are damaged due to failure to strictly follow the precautions during installation, all damages shall be borne by the installer.
