Solenoid Valves

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

 

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)

1st No.

Definition

Test Type

2nd 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

 

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