Combination water meter

Combination water meter

Model:LXF-50-200

Application:
Measuring the volume of cold potable water passing through the pipeline

Quality:
·As a dry meter, deposits in the register are avoided. This ensures a clear reading in long term service.
·The main register may rotate more than 360 degrees for easily reading in any position.
·Low head loss.
·Lower starting flow.
·Novel structure, simple maintenance.
·Can be equipped with reed switch option.
·Particularly suited in commercial, institutional places of assembly and facilities with fluctuating usage and flow rates.

Woring pringciple
·changeover spring valve diverts flow to the appropriate meter, opening or closing according to pressure variations by changes in flow rate.
·At low flow rate, the changeover valve closes and only the small meter in operation 2 water flows through the bypass meter, and the usage is recorded on its register.
·When the flow rate increases, pressure is exerted on the large meter, until the flow rate reaches approximately one half the capacity of the bypass meter.
At this point, the drop in pressure causes the valve to open 1, and water flows through both the main meter and bypass meter, and the overall consumption is read by combining the main and bypass registers.
·When flow is decreasing, the process in reversed. The valve is closed and water flows through the small meter.

Construction
·The meter model LXF-50-200 combines a large caliber water meter (model LXLC-B) on the main line, a small water mete (model LXSC-E) on the bypass line, and a flow changeover valve.
Annotation: LXLC-B removable element woltman water meter.
                  LXSC-E multi-jet dry type vane wheel water meter.

Installation
·The meter must be installed with the direction of the flow as indicated by the arrow cast in the meter body.
·A horizontal position with the register face upwards is recommended.
·The meter must have 10 diameters straight pipe ahead of the meter and 5 diameters straight pipe after to insure proper flow through the meter.
·The valves must be installed in the front and the back of the water meter.

Working condition:
temperature:
≤40℃ for cold potable water meter
Pressure:≤ 11Mpa

Maximum Permissible Error:
Qmin→Qt(ex Qt)=±5%;
Qt→Qs(both included)=±2% or ±3%(hot water)
Qmin=Min Flow, Qt=Transition Flow, Qs= Max Flow.

Main Technical Data
Type Meter Size Max Flow Nominal Flow Transitional Flow Min Flow Min Reading lectura Max Reading lectura
mm m3/h m3
LXF-50 50&15 30 15 0.12 0.03 0.0001 999999+99999
LXF-65 65&20 50 25 0.20 0.05 0.0001 999999+99999
LXF-80 80&20 80 40 0.20 0.05 0.0001 999999+99999
LXF-100 100&20 120 60 0.20 0.05 0.0001 999999+99999
LXF-150 150&40 300 150 0.80 0.20 0.001 9999999+999999
LXF-200 200&50 500 250 1.2 0.30 0.001 9999999+999999
Dimensions and weight
Meter Size
Length Width Height Connecting Thread Weight KG
D D1 Connecting Bolt
mm kg
50&15 280 268 256 165 125 4×M16 20
65&20 370 305 266 185 145 4×M16 26
80&20 370 310 276 200 160 8×M16 27.5
100&20 370 320 286 220 180 8×M16 33
150&40 500 445 345 285 240 8×M20 64
200&50 500 525 375 340 295 8×M20 114.5
 
No. Name Qty No. Name Qty No. Name Qty
1 Body(main water meter) 1 9 Adapting flange 1 17 Bolt 2
2 LXLC-B except for the body 1 10 Coupling gasket 2 1 18 Bypass meter (LXSC-E) 1
3 Flat washer 8 11 Bolt 2 19 Nut 3
4 Bolt 8 12 Flat washer 2 20 Coupling 2 1
5 Flange o-ring 1 13 Street elbow 2 1 21 Coupling o-ring 1
6 Changeover vale 1 14 Coupling gasket 3 22 Street elbow 1 with non-return valve 1
7 Spring washer 8 15 Connecting plate 1 23 Coupling 1 1
8 Nut 8 16 Spring washer 2 24 Coupling gasket1 1