Cla-Val 50-49 User Manual

Page 11

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background image

Model 100-20 Flow Chart

(Based on normal flow through a wide open valve)

20 24

10

20

30 40

60 80 100

200

500

1000

2000

5000

10,000 20,000 50,000

1

2

3

4

6

8

10

20

30

40

60

80

100

5

3

Angle Valve Sizes (Inches)

Globe Valve Sizes (Inches)

3

4

6

8

10

12

6

8

16

Pressure Drop — psi

4

18

30

14

Flow Rate gpm (water)

K =

894d

4

C

2

v

L =

K

12 f

K Factor (Resistance Coefficient)
The Value of K is calculated from the formula:
(U.S. system units)

Equivalent Length of Pipe
Equivalent lengths of pipe (L) are determined from the formula:
(U.S. system units)

Fluid Velocity
Fluid velocity can be calculated from the following formula:
(U.S. system units)

d

V =

.4085 Q

2

d

C

V

Factor

Formulas for computing C Factor, Flow (Q) and Pressure Drop

V

( P):

C

V

=

Q

P

C

V

=

Q

P

C

V

=

Q

P

2

V

Where:

U.S. (gpm) @ 1 psi differential at 60 F water

(l/s) @ 1 bar (14.5 PSIG) differential

or

at 15 C water

inside pipe diameter of Schedule 40 Steel Pipe (inches)

friction factor for clean, new Schedule 40 pipe

(dimensionless) (from Cameron Hydraulic Data,

18th Edition, P 3-119)

Resistance Coefficient (calculated)

Equivalent Length of Pipe (feet)

Flow Rate in U.S. (gpm) or (l/s)

Fluid Velocity (feet per second) or (meters per second)

Pressure Drop in (psi) or (bar)

=

=

=

=

=

=

=

=

=

P

V

Q

L

K

f

d

C

Functional Data

Model 100-20

*Estimated

Valve Size

Inches

3

4

6

8

10

12

14

16

18

20

24

30

mm.

80

100

150

200

250

300

350

400

460

500

600

760

C V

Factor

Globe

Pattern

Gal./Min. (gpm.)

62

136

229

480

930

1458

1725

2110

2940*

3400*

4020

7900*

Litres/Sec. (l/s.)

15

32.5

55

115

223

350

414

506

705

816

965

1895

Angle

Pattern

Gal./Min. (gpm.)

—

135

233

545

—

—

—

—

—

—

—

—

Litres/Sec. (l/s.)

—

32

56

132

—

—

—

—

—

—

—

—

Equivalent

Length

of

Pipe

Globe

Pattern

Feet (ft.)

293

251

777

748

621

654

750

977

983

1125

3005

2130

Meters (m.)

89.3

76.4

237.1

228.1

189.5

199.4

228.7

298.1

299.9

343.2

916.6

649.6

Angle

Pattern

Feet (ft.)

—

254

751

580

—

—

—

—

—

—

—

—

Meters (m.)

—

77.6

229

176.9

—

—

—

—

—

—

—

—

K

Factor

Globe Pattern

20.6

12.7

23.1

15.7

10.4

8.5

8.9

10.2

8.4

8.8

19.1

10.5

Angle Pattern

—

12.9

22.3

12.2

—

—

—

—

—

—

—

—

Liquid Displaced

from Cover Chamber

When Valve Opens

Fl. Oz

—

—

—

—

—

—

—

—

—

—

—

—

U.S. Gal.

0.32

.08

.17

.53

1.26

2.51

4.0

4.0

9.6

9.6

9.6

29.0

ml

—

—

—

—

—

—

—

—

—

—

—

—

Litres

.12

.30

.64

2.0

4.8

9.5

15.1

15.1

36.2

36.2

36.2

110

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