Useful engineering Data

Useful Solenoid Valve Engineering Data

Liquid Flow Formulae

Air Flow Formulae

Q=Kv x √(DP/d)

or

DP = d x (Q/Kv)²

DP <1/2 of P1

DP = 1/2 of P1

 Q = 1.69 x Kv √(DP x P2)

Q = 0.84Kv x P1

Q = Flow L/Min

DP = Pressure Drop (Bar)

d = density i.e. Water = 1

Kv = flow factor coefficient of valve (L/Min)

(N.B. DP 5 - 10% is preferred)

Q = Flow (M³ Hr)

DP = Pressure Drop (Bar)

Kv = flow factor coefficient of valve (M³ Hr)

P1 = inlet pressure + 1 bar

P² = absolute downstream pressure = (inlet pressure + 1 bar - DP)

Saybolt Universal (seconds)

Engler (degrees)

Kinematic (centistokes)

Saybolt Universal (seconds)

Engler (degrees)

Kinematic (centistokes)

-

1.05*

1.5

103

3.0

21.3

 PRESSURE

1 Bar = 14.5 PSI

1 Bar = 100 kPa (Kilopascal)

1 PSI = 6.9 kPa

1 Kg/cm² = 0.98 Bar

1 Atmosphere = 1.013 Bar

1 Inch Water gauge = 2.49 mbar

1 mm Mercury = 1.33 mbar

1 Ton / in² = 154 Bar

 Volume

1 Gallon (UK) = 4.54 Litres

1 Gallon 9USA) = 3.79 Litres

1 Pint (UK) = 0.57 Litres

1 Pint (USA) = 0.47 Litres

1 Fluid Once (UK) = 28.4 cm³

1 Fluid Once (USA) = 29.6 cm³

 Flow

1 CFM = 0.472 Litres a second

1 CFM = 0.000472 m³/Sec

1 CFM = 28.32 Litres a minute

 Temperature

From °F to C°

Add 40 then multiply by 5 then divide by 9 then -40

 or

From C° to F°

Multiply by 9 then –40 divide by 5 then +40 

Length

1 Inch = 25.4mm

1/16” Inch = 1.5875mm

1 foot = 0.305 Meters

1 Mile = 1.609 Kilometre

Read our FAQ section for more information at solenoid-valve.world

1.15*

2.5

109

3.2

22.8

37

1.25*

3.4

115

3.4

24.1

40

1.3*

4.2

125

3.7

26.7

42

1.4*

5.0

137

4.0

29.2

45

1.45*

5.7

148

4.3

31.7

50

1.6*

7.5

160

4.6

34.2

57

1.8*

9.4

171

4.9

36.8

62

1.9

11.0

183

5.2

39

68

2.1

12.6

205

5.9

44

74

2.2

14.2

242

7

50

79

2.4

15.5

256

7.3

55

85

2.6

17.0

285

8.1

62

92

2.7

18.6

313

8.9

68

98

2.9

20.0

342

9.8

74

Degrees Of Protection Provided By Electrical Enclosures (IP ratings)

1^st No.

Definition

Test Type

2^nd No.

Definition

Test Type

1

Protected against objects >50mm Protect from access with hand 

1

Protected against vertically falling water drops

2

Protected against objects >12.5mm Protected against access with finger

2

Protected against vertically falling water drops up to 15° inclination.

3

Protected against objects >2.5mm Protected against access with tool

3

Protected against vertically falling water drops up to 60° inclination.

4

Protected against objects >1.0mm Protected against access with wire 

4

Protected against splashing water in any direction

5

Dust protected

5

Protected against water jets from any direction

6

Dust tight

6

Protected against powerful water jets from any direction

7

Protected against temporary immersion in water

8

Protected against the effect of submersion