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  PRODUCTS
BUTTERFLY VALVE
DN40-DN300 Butterfly valve
DN350-DN600 Butterfly Valve
DN550-DN1000 Single Flange Butterfly Valve
DN700-DN1200 U-Section Butterfly Valve
DN50-DN150 Thread End Butterfly Valve
DN50-DN300 Groove End Butterfly Valve
DN50-DN1200Flange Type Butterfly valve
CHECK VALVE
DN50-DN800 Wafer Type Dual-Plate Check valve
DN15-DN400 Wafer Type Single-Plate Check Valve
MANUAlL VALVE OPERATOR
Manual Valve Operator-Lever Handle
Manual Valve Operator-Gearbox
Operating Torque (In-Lbs)
Sheet of Cv Value
HomeProducts   → MANUAlL VALVE OPERATOR  → Operating Torque (In-Lbs)
Operating Torque (In-Lbs)
 
 
 

 

Valve Size

1.0MPa

1.6MPa

2.0MPa

Inch

mm

Wet

Dry

Wet

Dry

Wet

Dry

1 1/2

40

82

104

96

106

109

112

2

50

108

121

115

124

159

254

2 1/2

65

136

159

152

180

184

313

3

80

192

226

204

240

245

392

4

100

328

387

352

440

439

724

5

125

512

684

548

750

777

981

6

150

831

1462

907

1100

1208

1936

8

200

1527

1895

1697

2100

1870

3085

10

250

2530

3346

2857

3700

3210

5457

12

300

3794

5092

4338

5900

4891

8070

14

350

4870

7305

5527

8580

6497

10395

16

400

6685

10027

7484

11566

13730

21968

18

450

8958

13437

10010

15819

17435

27896

20

500

11950

17925

12667

20425

18379

29407

22

550

16942

26089

18637

29819

33741

53968

24

600

18680

28020

20361

32840

37176

59482

26

650

26472

41285

/

/

/

/

28

700

28958

43438

/

/

/

/

30

750

33336

50004

/

/

/

/

32

800

38124

57188

/

/

/

/

34

850

43917

65482

/

/

/

/

36

900

46528

69792

/

/

/

/

40

1000

78993

118490

/

/

/

/

42

1050

79864

119796

/

/

/

/

48

1200

111112

166668

/

/

/

/


Note: 1. The above 'WET' means the test fluid is water or other non-lubricating mediums. 'DRY' means the test medium is dry compressed air.
      2. When the valve serves in a too low working temperature, operating torque will increase with the consequence of increased hardness of rubber in low temperature.

Flow Coefficient of Butterfly Valve: Cv Value
Cv Value has an expressions to calculate and definition as follow
Note: Q---Fluid Volume that pass the valve per minute(Usgal/min)
P---Pressure Difference between import and export of the valve(psi)
G---Density of Fluid
With the above expressions, You may calculate the flow volume that pass the a valve or pressure loss between the two end of a valve.
Example1)A 6" butterfly valve is at 70¡ãopening, and a kind of fluid, which density is 0.8, pass the valve with volume 1200 Usgal/min£¬then the pressure loss between the two end is
P =GQ^2 / Cv^2=0.8*1200^2/958^2


                    
Example2)10" butterfly valve is at 90¡ãopening, and there is a pressure loss 0.6 psi between the two end of the valve when a kind of fluid, which density is 0.8, pass the valve£¬then the flow volume that pass the valve is