Flow Charts - Herz Valves UK

® 

Fig No 4218CS 

Commissioning Set 

HV2740 + 4218 

Flow Data 

In this flow data manual we have endeavoured to make the information 

as accurate as possible. 

We cannot accept any responsibility should it be found that in any 

respect the information is inaccurate or incomplete or becomes so as a 

result of further developments or otherwise. 

Herz Valves UK Ltd. 

Progress House, Moorfield Point, Moorfield Road 

Slyfield Ind Estate, Guildford, Surrey GU1 1RU 

© Herz Valves UK Ltd. 2010 

® 

Tel: 01483 502211 

Fax: 01483 502025 

e-mail: sales@herzvalves.com 

Website: www.herzvalves.com

Technical Data 

HERZ-Stainless steel orifice plate 

PN16 

The flow rate can be calculated using the K vs value and a measured 

signal. 

July 2010 

Issue 1 

Flow Coefficient 

K v = Q K vs = Q 

√ ∆P 

√ ∆Ps 

where Kv & Kvs = flow coefficient (m 3 /hr at 1 bar differential) 

Q = flow rate (m 3 /hr) 

∆P = headloss attributable to orifice plate (bar) 

∆Ps = differential press across tappings (signal) (bar) 

Size DN65 DN80 DN100 DN125 DN150 DN200 

K vs Values 

K vs 100.7 133.6 237.7 339 511 858 

Size DN250 DN300 

K vs 1235 1793 

The pressure loss across the orifice plate can be determined by 

multiplying the signal by the pressure loss factor. 

Pressure Loss 

The pressure loss is always less than measured signal. 

Size DN65 DN80 DN100 DN125 DN150 DN200 

Factor 0.40 0.40 0.35 0.35 0.35 0.35 

Pressure Loss 

Factors 

Size DN250 DN300 

Factor 0.35 0.35 

Under the Pressure Equipment Directive (PED) these commissioning 

sets have been specified for Group 2 Liquids i.e. non-hazardous 

Sizes DN50 to DN300 are classified as SEP 

PED 

Categorisation 




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HERZ-Commissioning Valve 

PN16 

Herz 2740 orifice plates can be installed in isolation or close coupled to 

a globe double regulating valve complying with BS 7350, of the same 

nominal diameter. 

July 2010 

Issue 1 

Installation 

Regardless of installation there must always be a minimum of 5 pipe 

diameters of straight pipe, without intrusion, upstream of the orifice 

plate. 

When used in isolation a minimum of 3 pipe diameters of straight pipe 

are required downstream of the orifice plate. 

When close coupled to a Herz 4218 double regulating valve no straight 

pipe is required after the valve. 

When used in conjunction with a butterfly double regulating valve, a 

spool piece equivalent to a minimum of 2 pipe diameters is required 

between the orifice plate and butterfly valve. 

For more detailed instructions please refer to the Installation, Operation 

and Maintenance Instructions supplied with the orifice plate and valve. 

5D 

3D 

5D 

5D 

2D 

Once the required flow rate has been calculated, the size of the orifice 

plate can be determined based on the following: 

The minimum signal at the design flow rate of 1 kPa. 

For minimum pressure loss, a maximum signal of 4.7 kPa, which 

corresponds to the maximum differential pressure range of a 

fluorocarbon manometer. 

Sizing 

The pressure loss across the commissioning set is the combined loss 

attributable to the orifice plate and double regulating valve. 

The double regulating valve shall not be used less than 25% open. 

Pressure Loss 




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HERZ-Double Regulating Valve 

PN16 

July 2010 

Issue 1 

Position 

Open 

DN65 DN80 DN100 DN125 DN150 DN200 DN250 DN300 

K v Values 

3 31.6 

3.5 12.6 35.8 

4 11.2 13.0 14.2 40.2 60.5 137 

4.5 12.0 14.3 15.8 47.0 69.1 169 195 

5 13.9 15.5 17.6 53.8 77.6 201 216 

5.5 14.8 18.7 21.9 62.8 88.2 233 239 272 

6 15.8 21.9 26.2 71.9 98.8 266 263 302 

6.5 17.1 28.1 34.7 85.9 112 302 290 324 

7 18.4 34.3 43.2 99.9 126 339 317 346 

7.5 20.4 42.7 53.1 120 145 376 358 367 

8 22.5 51.0 62.9 139 163 413 400 389 

8.5 26.0 59.4 73.6 156 189 442 456 455 

9 29.4 67.9 84.2 173 216 472 513 521 

9.5 33.8 73.8 92.5 186 236 501 555 586 

10 38.1 79.7 101 199 257 531 597 664 

11 45.8 89.0 115 219 286 561 697 785 

12 51.8 95.6 128 235 318 591 781 907 

13 57.6 101 138 341 621 846 1009 

14 62.2 106 147 359 649 928 1111 

15 65.3 155 375 676 972 1238 

16 68.2 161 392 1014 1365 

17 166 1065 1447 

18 1083 1529 

22 1785 




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HERZ - Flow data 

Art. HV2740 - 07 

Stainless Steel Orifice Plate 

Dim. DN65 

30 

20 

10 

8 

6 

4 

2 

Kvs = 100.7 

1 

∆P Signal - kPa 

0.8 

0.6 

0.4 

1.5 2.0 3.0 4.0 5.0 6.0 8.0 10 15 

Flowrate - l/s 

We reserve the right to make design modifications 

HERZ Valves UK Ltd. 



Tel: 01483 502211 

Fax: 01483 502025 


Website: www.herzvalves.com 

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HERZ - Flow data - pressure drop 

Art. 4218 - 71 

Douuble Regulating Valve 

Dim. DN65 

Position 

Kv 

4 5 6 7 8 9 10 12 14 16 

11.2 13.9 15.8 18.4 22.5 29.4 38.1 51.8 62.2 68.2 

100 

80 

60 

40 

20 

4 

5 

6 

7 

8 

9 

10 

11 

12 

14 16 

10 

8 

6 

4 

∆P Pressure Drop - kPa 

2 

1 

0.8 

0.7 

1 2 3 4 5 6 8 10 15 






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Art. HV2740 - 08 


Dim. DN80 

30 

20 

10 

8 

6 

4 

2 

Kvs = 133.6 

1 


0.8 

0.6 

0.4 

2.0 3.0 4.0 5.0 6.0 8.0 10 20 






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Art. 4218 - 72 


Dim. DN80 

Position 

Kv 

3.5 4 5 6 7 8 9 10 12 14 

12.6 13.0 15.5 21.9 34.3 51.0 67.9 79.7 95.6 106 

100 

80 

60 

40 

4.5 

20 

3.5 

4 

5 

6 

7 

8 

9 

10 

12 14 

10 

8 

6 

4 


2 

1 

0.8 

0.7 

1.5 2 3 4 5 6 8 10 20 






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Art. HV2740 - 09 


Dim. DN100 

30 

20 

10 

8 

6 

4 

2 

Kvs = 237.7 

1 


0.8 

0.6 

0.4 

4.0 5.0 6.0 8.0 10 20 30 






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Art. 4218 - 73 


Dim. DN100 

Position 

Kv 

4 5 6 7 8 9 10 12 14 17 

14.2 17.6 26.2 43.2 62.9 84.2 101 128 147 166 

100 

80 

60 

40 

20 

4 

5 

6 

7 

8 

9 

10 

12 14 

17 

10 

8 

6 

4 

∆P Presure Drop - kPa 

2 

1 

0.8 

0.7 

2 3 4 5 6 8 10 20 30 






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Art. HV2740 - 10 


Dim. DN125 

30 

20 

10 

8 

6 

4 

2 

Kvs = 339 

1 


0.8 

0.6 

0.4 

5.0 6.0 8.0 10 20 30 30 






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Art. 4218 - 74 


Dim. DN125 

Position 

Kv 

3 4 5 6 7 8 9 10 12 

31.6 40.2 53.8 71.9 99.9 139 173 199 235 

100 

80 

60 

40 

20 

3 

4 

5 

6 

7 

8 

9 

10 12 

10 

8 

6 

4 


2 

1 

0.8 

0.7 

4 5 6 8 10 20 30 40 






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Art. HV2740 - 11 


Dim. DN150 

30 

20 

10 

8 

6 

4 

2 

Kvs = 511 

1 


0.8 

0.6 

0.4 

7.0 8.0 10 20 30 40 50 60 






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Art. 4218 - 75 


Dim. DN150 

Position 

Kv 

4 5 6 7 8 9 10 12 14 17 

60.5 77.6 98.8 126 163 216 257 318 359 392 

100 

80 

60 

40 

20 

4 

5 

6 

7 

8 

9 

10 

11 

12 

14 

16 

10 

8 

6 

4 


2 

1 

0.8 

0.7 

5 6 8 10 20 30 40 50 60 






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Art. HV2740 - 12 


Dim. DN200 

30 

20 

10 

8 

6 

4 

2 

Kvs = 858 

1 


0.8 

0.6 

0.4 

10 20 30 40 50 60 80 100 






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Art. 4218 - 76 


Dim. DN200 

Position 

Kv 

4 5 6 7 8 9 10 11 12 15 

137 201 266 339 413 472 531 561 591 676 

100 

80 

60 

40 

4 

20 

5 

6 

7 

8 

9 

11 

10 12 

15 

10 

8 

6 

4 


2 

1 

0.8 

0.7 

10 20 30 40 50 60 80 100 






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Art. HV2740 - 13 


Dim. DN250 

30 

20 

10 

8 

6 

4 

2 

Kvs = 1235 

1 


0.8 

0.6 

0.4 

20 30 40 50 60 80 100 200 






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Art. 4218 - 77 


Dim. DN250 

Position 

Kv 

4.5 5 6 7 8 9 10 12 14 18 

195 216 263 317 400 513 597 781 928 1083 

100 

80 

60 

40 

20 

4.5 

5 

6 

7 

8 

9 

10 

12 14 

16 

18 

10 

8 

6 

4 


2 

1 

0.8 

0.7 

15 20 30 40 50 60 80 100 200 






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Art. HV2740 - 14 


Dim. DN300 

30 

20 

10 

8 

6 

4 

2 

Kvs = 1793 

1 


0.8 

0.6 

0.4 

30 40 50 60 80 100 200 300 






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Art. 4218 - 78 


Dim. DN300 

Position 

Kv 

5.5 6 7 8 9 10 12 14 18 22 

272 302 346 389 521 664 907 1111 1529 1785 

100 

80 

60 

40 

5.5 

6 

7 

8 

9 

10 

20 

12 14 16 

18 

22 

20 

10 

8 

6 

4 


2 

1 

0.8 

0.7 

20 30 40 50 60 80 100 200 300 






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Fax: 01483 502025 



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Flow Charts - Herz Valves UK

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