Connexion Developments Ltd Solenoid Valve Useful Engineering Data

Connexion Engineering Data

Liquid Flow Formulae

Air Flow Formulae

Q=Cv x Sq Rt (DP/d) or DP=d(Q/Cv)²

Where DP less than P1/2

Where DP equal to P1/2

Q=1.69Kv x Sq Rt (DPxP²)

Q = 0.84Kv x P¹

Q = Flow L/Min

DP = Pressure Drop (Bar)

d = density i.e. Water = 1

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

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

Q = Flow (M³Hr)

DP = Pressure Drop (Bar)

Kv = flow factor coefficient of valve (M³Hr)

P1 = inlet pressure + 1 bar

P� = 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
34	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

PRESSURE

1 Bar = 14.5 PSI

1 Bar = 100 kPa (Kilopascal)

1 PSI = 6.9 kPa

1 Kg/cm� = 0.98 Bar

1 Atmosphere = 1.013 Bar

1 Inch Water gauge = 2.49 mbar

1 mm Mercury = 1.33 mbar

1 Ton / in� = 154 Bar

Volume

1 Gallon (UK) = 4.54 Litres

1 Gallon (USA) = 3.79 Litres

1 Pint (UK) = 0.57 Litres

1 Pint (USA) = 0.47 Litres

1 Fluid Once (UK) = 28.4 cm�

1 Fluid Once (USA) = 29.6 cm�

FLOW

1 CFM = 0.472 Litres a second

1 CFM = 0.000472 m�/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

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

Degrees Of Protection Provided By Electrical Enclosures (IP rating
1st No	Definition	Test Type	2nd No	Definition	Test Type
1	Protected against objects � 50mm		1	Protected against vertically falling water drops
2	Protected against objects � 12.5mm		2	Protected against vertically falling water drops up to 15 degrees inclination
3	Protected against objects � 2.5mm		3	Protected against vertically falling water drops up to 60 degrees inclination
4	Protected against objects � 1mm		4	Protected against splashed 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 water immersion
			8	Protected against the effects of submersion