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Cla-Val 340-02/3640-02 User Manual

Page 24

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A flow range:

Select the sizing chart that matches pipe size and locate required flow range between the minimum and maximum limits of an
orifice bore. Frequently the flow range will fit between more than one bore size. To resolve this, decide the flow rate that
system will be operated at most frequently. Locate the flow which is closest to this under the nominal flow column, and
select the corresponding bore size dimension.

6" Valve / Pipe Size

Bore

Size

Flow - gpm

Min.

Max.

Nominal

4.60

490

1960

1100

4.40

435

1740

980

4.20

380

1520

850

4.00

330

1320

750

3.80

300

1200

670

3.60

265

1060

590

3.40

230

920

520

3.20

200

800

450

3.00

175

700

395

2.80

150

600

340

2.60

130

520

295

2.40

110

440

245

6" Valve / Pipe Size

Bore

Size

Flow - gpm

Min.

Max.

Nominal

4.60

490

1960

1100

4.40

435

1740

980

4.20

380

1520

850

4.00

330

1320

750

3.80

300

1200

670

3.60

265

1060

590

3.40

230

920

520

3.20

200

800

450

3.00

175

700

395

2.80

150

600

340

2.60

130

520

295

2.40

110

440

245

2

1

2

" Valve / Pipe Size

Bore

Size

Flow - gpm

Min.

Max.

Nominal

1.87

80

330

180

1.60

55

220

120

1.40

40

160

88

1.20

28

115

62

1.00

19

80

43

.80

12

50

28

2" Valve / Pipe Size

Bore

Size

Flow - gpm

Min.

Max.

Nominal

1.55

55

220

125

1.50

50

200

115

1.40

42

168

95

1.20

29

116

65

1.00

19

76

45

.80

12

50

28

*For 1

1/2

" bore information please consult the factory

1. In determining a bore size, the nominal flow rate (or range of flow) and the pipe size in which the orifice plate assembly will

be installed must be known.

2. Sizing a bore for:

A constant flow rate:

Select the sizing chart that matches pipe size and locate the flow rate under the nominal column which is closest to
required flow; select the corresponding bore size dimension.

Sizing An Orifice Plate Bore

Orifice Plate Bore Chart

Example:

A 6" pipe with a desired constant flow of 700

gpm

.

Using the 6" chart, the closest flow in the nominal
column is 670

gpm

which has a corresponding bore

size of 3.80".

Example:

A 6" pipe with a flow range of 300-1000 gpm. Using
the 6" chart, more than one bore size can accom-
modate this range. The most frequent flow rate will
be 500 gpm. Using the nominal flow column, the
closest flow is 520 gpm which has a corresponding
bore size of 3.40"