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flow meter

LBTC Positive Displacement Rotary Vane Flow Meter
LBTC Positive Displacement Rotary Vane Flow Meter
Summary
LBTC positive displacement rotary vane flow meter belongs to positive displacement meter and is one of the most accurate measuring meters for measuring liquid of modern industry. The flow meter has stable  performance and is insensitive to flow state change of upstream medium and change of medium viscosity. It has high measuring accuracy,good applicability and long life. Now it has widely used for every field such as process control of modern industry and trade settlement, etc.
 
  • Operating Principle
  • Technical Parameter
  • Model Selection Table
  • Outline and installation
  • Ordering information
There are two or three couples of rotary  vanes, they slide radially along grooves in the barrel-type rotor. With the action of flowing pressurized fluid, pushing the rotary vanes and the rotor rotates around its axis. Rotary vanes continuously divide the flowing fluid into an individual volume, using drive gear and counting mechanism   calculate and indicate the total delivery of the fluid. The process as follows: when the rotary vanes are at the state as figure 1.1,vane A and D stretch out from the rotor and contact the inwall of measuring chamber while vane B and C retract back completely into rotor. With the fluid entering into the meter, it pushes the vanes and the rotor rotating clockwise. When the rotor and vanes run 1/8 circle, the vanes stop at the position as shown in figure 1.2, vane A stretches completely, vane D begins to retract back, vane C is still in completely contraction state, while vane B begins to stretch out. When the rotor and the vanes run a 1/4 circle, the vanes are in the positions as shown in figure 1.3. The vane A and B both completely stretch out, the space which is composed of the two vanes, rotor, the meter case bore, the upper cover and lower cover is full of measuring fluid. When the rotor and the vanes are in the position as shown in figure 1.4, the fluid in the space begins to be released with the vane A withdrawing gradually. Meanwhile, the vane C begins to stretch out, another new exactly measuring fluid volume between the vane B and C begins to form gradually. So when four vanes rotate around the whole circle is 4 times of volume. ( the meter has three pairs vanes, 6 space volumes will be drained) it realizes fluid measurement.

 
1.Intrinsic Error:0.2%;0.5% 
2.Nominal Diameter (mm):25mm;50mm;80mm;100mm;150mm;200mm;250mm;300mm; 
3.Nominal Pressure:2.5MPa;4.0MPa; 6.4MPa; 
4.Flow Rate Range:
 
Nominal Diameter 25 50 80 100 150 200 250 300
Intrinsic Error % 0.2 0.5 0.2 0.5 0.2 0.5 0.2 0.5 0.2 0.5 0.2 0.5 0.2 0.5 0.2 0.5
Min. Flow m3/h 3 1 8 5 25 18 35 25 60 40 100 80 120 110 300 200
Max. Flow m3/h 6 8 20 35 65 80 90 115 120 150 180 240 350 550 900 1000

5.Operation Temperature: -20。C ~ +250。C;(special temperature should indicate.)
6.Fluid Viscosity: 0.6~500mPa.s ( kinematic viscosity)
7.Pressure loss: no more than 0.1MPa(such as nominal diameter is DN80)
8.Min. Indication Unit: For equipped with mechanical header, subject to the model of selected header.
For equipped with intelligent header:  0.001m3
9. Integrated Flux: For equipped with mechanical header, subject to the model of selected header.
For equipped with intelligent header: 99999.9999 m3  
10. Coefficient of theoretical instrument: only for equipped with intelligent meter.
Nominal diameter DN 25 50 80 100 150 200 250 300
Coefficient of theoretical instrument N/L 18.868 6.993 3.657 2.357 1.634 1.483 0.841 0.563


Main features
◆The meter can be equipped with mechanical integrating instrument to realize local indication, and can be equipped with pulse signal transmitter or intelligent instrument to realize signal remote transmission;
◆High precision, the highest accuracy class is 0.2;
◆Rotary vanes are wear-resistant, and the vanes can operate in high pressure condition.
◆The pressure loss is small. Attenuation of accuracy is low and the pressure loss is no more than 0.1Mpa. (Such as nominal diameter is DN80)
◆The structure of the single housing is simple and the weight is light, The structure of double housing can not be influenced by thermal expansion and pressure, and deformation is very small.
◆Installation for the meter is very convenient , no need for auxiliary equipment such as straight pipe section, rectifier, etc. The meter cannot be influenced by pipe pieces such as valves, elbow, etc.
◆The meter can work very stable with no vibration and noise.
◆the pressure drop is more than velocity-type flow meter, but is better than other positive displacement meter.

Model

Code

Code meaning  

LBTC-

 

Positive displacement rotary vane flow meter

 

25

 

Nominal diameter:DN25mm

50

 

Nominal diameter:DN50mm

80

 

Nominal diameter:DN80mm

100

 

Nominal diameter:DN100mm

150

 

Nominal diameter:DN150mm

200

 

Nominal diameter:DN200mm

250

 

Nominal diameter:DN250mm

300

 

Nominal diameter:DN300mm

 

Q

 

House material: nodular cast iron

C

 

House material: carbon steel

P

 

House material: 304

 

2.5

 

Nominal Pressure: 2.5MPa

4.0

 

Nominal Pressure:4.0MPa

6.3

 

Nominal Pressure:6.4MPa

 

JX

 

With mechanical counter, local indication.

BS

 

With mechanical counter,  remote signal transmitted with pulse transmitter

ZN1

 

With intelligent instrument, local indication; remote signal transmitted with pulse transmitter.

ZN2

 

With intelligent instrument, local indication with
   4~20mA signal output.

ZN3

 

With intelligent instrument, local indication with 4~20mA signal output and remote signal transmitted with pulse signal transmitter

 

i

Intrinsically safe: ia IICT5 (for intelligent meter or pulse signal transmitter)

d

Explosion isolation: d IIBT4 (for intelligent meter or pulse signal transmitter)

LBTC-

 

Example 

LBTC-50Q2.5Z1i: Positive displacement rotary vane flow meters
◆Nominal Diameter: 50mm;
◆Material of the Body Case: Nodular cast iron;
◆Nominal Pressure: 2.5MPa;
◆Equipped with intelligent instrument with local indication and remote pulse signal remitted by transmitter;
◆Explosion-proof type: intrinsically safe
 

1. Structure and dimension
For LBTC positive displacement rotary vane flow meter outline and installation dimension as figure 2、3 and following table.
 

DN

PN

Outline Dimension
(mm)

Flange Connection Dimension(mm)

Spherical cast iron flange

Carbon and Stainless Steel Flange

mm

MPa

L

H

H1

D

D1

n-d

bolt

D

D1

n-d

bolt

25

2.5

248

360

90

115

85

4-φ14

M12

115

85

4-φ14

M12

4.0

248

360

90

115

85

4-φ14

M12

115

85

4-φ14

M12

6.3

320

358

89

140

100

4-φ18

M16

140

100

4-φ18

M16

50

2.5

350

427

123

165

125

4-φ19

M16

165

125

4-φ18

M16

4.0

350

427

123

165

125

4-φ19

M16

165

125

4-φ18

M16

6.3

460

686

184

175

135

4-φ23

M20

180

135

4-φ23

M20

80

2.5

440

427

160

200

160

8-φ19

M16

200

160

8-φ18

M16

4.0

440

427

160

200

160

8-φ19

M16

200

160

8-φ18

M16

6.3

460

920

260

210

170

8-φ23

M20

216

170

8-φ23

M20

100

2.5

530

528

180

235

190

8-φ23

M20

235

190

8-φ23

M20

4.0

530

528

180

235

190

8-φ23

M20

235

190

8-φ23

M20

6.3

622

996

319

250

200

8-φ25

M22

250

200

8-φ25

M32

150

2.5

650

596

216

300

250

8-φ28

M24

300

250

8-φ26

M24

4.0

650

596

216

300

250

8-φ28

M24

300

250

8-φ26

M24

6.3

640

968

360

340

280

8-φ34

M30

340

280

8-φ34

M30

200

2.5

700

800

300

360

310

12-φ28

M24

360

310

12-φ26

M24

4.0

700

800

300

375

320

12-φ31

M27

375

320

12-φ30

M27

6.3

900

1255

457

405

345

12-φ34

M30

405

345

12-φ34

M30

250

2.5

950

1100

540

425

370

12-φ31

M27

425

370

12-φ90

M27

4.0

950

1100

540

450

385

12-φ34

M30

450

385

12-φ34

M30

6.3

1040

1374

558

470

400

12-φ41

M36

470

400

12-φ41

M36

300

2.5

1000

887

455

485

430

16-φ31

M27

485

430

16-φ30

M27

4.0

1000

887

455

515

450

16-φ34

M30

515

450

16-φ34

M30

6.3

1150

1617

702

530

460

16-φ41

M36

530

460

16-φ41

M36

Note: nodular cast iron flange standard is GB12380.4-90~GB12380.7-90
Carbon steel or stainless steel flange PN2.5MPa executes standard of JB/T82.1-94;PN4.0MPa and PN6.3MPa execute standard of JB/T82.2-94.
 

For LBTC series positive displacement rotary vane flow meter with anchor bolt plate, please see figure 4 and the following table

Nominal Diameter
DN

Structure dimension (mm)

D

D1

H

n-d

Bolt

25

185

160

12

3-φ14

M12

50

235

200

15

3-φ18

M16

80

305

260

18

3-φ22

M20

100

335

300

20

3-φ23

M20

150

385

350

24

3-φ23

M20

200

480

440

25

3-φ25

M22

250

725

660

28

3-φ33

M30

300

855

780

30

3-φ34

M30

Note: anchor bolt disc plate should be ordered individually
Figure 4 Structure and dimension of anchor bolt plate
1-Gas eliminator 2-pressure gauge 3- filter
4、7、8- valve 5- thermometer
6- LBTC positive displacement rotary vane flow meter
Figure 5 Flow meter installation instructions
 

2 Installation requirements  
We suggest LBTC positive displacement rotary vane flow meter should install according to installation instruction as shown in figure 5.
2.1 Connection pipe of LBTC positive displacement rotary vane flow meter should be the same diameter and axis as inlet and exit of flow meter, can not have projections on pipe wall. Connection pipe near flow meter can’t have obvious transformation, and minimizing the impact on flow meter due to expansion and contraction of pipeline.
2.2 Installing flow meter on new pipe, to avoid sundries in pipe along with the fluid entering into flow meter that will cause damage, you can use short pipe instead of flow meter. After cleaning or purging the pipe, install the flow meter. Don’t let scavenging air pass bulk.
2.3 You should take off the sealing-capping of connecting flange on flow meter before installation, if impurity and gas content in fluid is high, we suggest installing filter、gas eliminator or LPXG before flow meter, filter mesh should be used as following ranges: flow meter of DN20-50 should use 20mesh, DN80-150 should use 15mesh, DN200-300 should use 10mesh.
2.4 The flow meter should be installed horizontally on main pipe ,generally the slant angle should be no more than 15°,to make sure clearance of rotary vane of flow meter is equalizing and measurement is accurate.
2.5 Direction of arrow on flow meter should be the same as flow direction of fluid when installing, flow meter and straight pipe of both sides should be on coaxial line.
2.6 Flow throttle valve and switch valve installed on pipe work reliably. For observation and inspection conveniently, abscission of bypass pipe can use closing device which is composed of two switch valves in series, there is a small-bore leak valve on the short connecting pipe between two valves, you can inspect the cutting capacity conveniently.
2.7 Use strictly according to range on the nameplate of flow meter: all of max. flow, operating pressure, operating temperature, fluid viscosity can’t exceed specialized range on the nameplate of flow meter.
2.8 When using the flow meter, you should open the valve slowly and increase the flow gradually until reaching needed flow, but can’t exceed the max. flow limited by nameplate on flow meter.
2.9 The flow meter should be maintained periodically, main content of maintenance as follows:
a) Inspecting whether the flow range exceeds max. flow on the nameplate;
b) Observing whether there is regular noise in the housing of operating flow meter, and whether there is bigger impurity and foreign matter entering flow meter.
c) After the parts replacement, you need to re-calibrate.
d) The flow meter in normally using should be calibrated regularly according to industry stipulation.
e) When using mechanical integrating instrument, you should inject lubricant regularly.
 
◆Specification:
◆Accuracy class:
◆Max. Min. flow value;
◆Fluid:
◆Operating temperature:
◆Fluid viscosity
◆Please note if the transmission distance is
 more than 100m;
◆Brand of material contacting fluid:
◆Other flanges standard: