Solenoid Valves

Vacuum Cross Reference Guide.

One of the key criteria for selection of a solenoid valve is the pressure of the media to be controlled. Typical general purpose assisted lift solenoid valves can work with Vacuum up to about 10 Bar (147 psi), however these pressure parameters are dependant on the solenoid valve of choice with other solenoid valves unable to cope under high vacuum applications. This can be additionally complicated when the measurement of vacuum is given in different formats and users can find themselves confused trying to convert from Torr to inches Mercury vaccum.

Below is a cross reference guide to various measurements of vacuum to help users cross reference different measurements from Torr, millimetres of Mercury, Pounds Per Square Inch, Inches Mercury Gauge, Atmospheres, Inches of Water, Kilograms per square centimetre, Kilo Pascals and Millibar.

Vacuum can also be measured as a percentage of absolute vacuum, for example a 50% vacuum would be 7.35 psi (absolute) i.e. half of 14.7 psi (no vacuum at all). 

Torr
mm
HgA
PSIA
Inches HgA
Inches HgV
Atmospheres
Inches H2O(a)
inches H2O(v)
kg/sq.cm
kPa
mBar
760
760
14.7
29.92
0.00
1.00
406.8
0.0
1.03
101.31
1013.3
700
700
13.54
27.56
2.36
0.92
374.7
32.1
0.95
93.31
933.3
600
600
11.61
23.62
6.30
0.79
321.2
85.6
0.82
79.98
800.0
500
500
9.67
19.69
10.24
0.66
267.7
139.2
0.68
66.65
666.7
400
400
7.74
15.75
14.17
0.53
214.1
192.7
0.54
53.32
533.3
300
300
5.80
11.81
18.11
0.39
160.6
246.2
0.41
39.99
400.0
250
250
4.84
9.84
20.08
0.33
133.8
273.0
0.34
33.33
333.3
200
200
3.87
7.87
22.05
0.26
107.1
299.8
0.27
26.66
266.7
175
175
3.38
6.89
23.03
0.23
93.7
313.2
0.24
23.33
233.3
150
150
2.90
5.91
24.02
0.20
80.3
326.5
0.20
20.00
200
125
125
2.42
4.92
25.00
0.16
66.9
339.9
0.17
16.66
166.7
100
100
1.93
3.94
25.98
0.13
53.5
353.3
0.14
13.33
133.3
90
90
1.74
3.54
26.38
0.12
48.2
358.7
0.12
12.00
120.0
80
80
1.55
3.15
26.77
0.11
42.8
364.0
0.11
10.66
106.7
70
70
1.35
2.76
27.17
0.09
37.5
369.4
0.10
9.33
93.3
60
60
1.16
2.36
27.56
0.08
32.1
374.7
0.08
8.00
80.0
51.7
51.7
1.00
2.04
27.89
0.07
27.7
379.2
0.07
6.89
68.9
50
50
0.97
1.97
27.95
0.07
26.8
380.1
0.07
6.67
66.7
40
40
0.77
1.57
28.35
0.05
21.4
385.4
0.05
5.33
53.3
30
30
0.58
1.18
28.74
0.04
16.1
390.8
0.04
4.00
40.0
25.4
25.4
0.49
1.00
28.92
0.03
13.6
393.2
0.03
3.39
33.9
25
25
0.48
0.98
28.94
0.03
13.4
393.5
0.03
3.33
33.3
20
20
0.39
0.79
29.13
0.03
10.7
396.1
0.03
2.67
26.7
15
15
0.29
0.59
29.33
0.02
8.0
398.8
0.02
2.00
20.0
10
10
0.19
0.39
29.53
0.01
5.4
401.5
0.01
1.33
13.3
7.5
7.5
0.15
0.30
29.63
0.01
4.0
402.8
0.01
1.00
10.0
5
5
0.10
0.20
29.72
0.01
2.7
404.2
0.01
0.67
6.7
2.5
2.5
0.05
0.10
29.82
0.00
1.3
405.5
0.00
0.33
3.3
1
1
0.02
0.04
29.88
0.00
0.5
406.3
0.00
0.13
1.3
0.75
0.75
0.01
0.03
29.89
0.00
0.4
406.4
0.00
0.10
1.0
0.5
0.5
0.01
0.02
29.90
0.00
0.3
406.6
0.00
0.07
0.7
0.25
0.25
0.00
0.01
29.91
0.00
0.1
406.7
0.00
0.03
0.3
0.1
0.1
0.00
.000
29.92
0.00
0.1
406.8
0.00
0.01
0.1
%
Vacuum
inHg (rel)
ft H2O (rel)
Torr (abs) 
mmHg (abs)
mbar (abs)
psia (abs)
0%
0.00
0.00
760.0
1013.3
14.70
10%
2.99
3.39
684.0
911.7
13.23
20%
5.98
6.78
608.0
810.4
11.76
30%
8.98
10.17
532.0
709.1
10.29
40%
11.97
13.56
456.0
607.8
8.82
50%
14.96
16.95
380.0
506.5
7.35
60%
17.95
20.34
304.0
405.2
5.88
70%
20.94
23.73
228.0
303.9
4.41
80%
23.94
27.12
152.0
202.6
2.94
90%
26.93
30.51
76.0
101.3
1.47
91%
27.23
30.85
68.4
91.2
1.32
92%
27.53
31.19
60.8
81.0
1.18
93%
27.83
31.53
53.2
70.9
1.03
94%
28.13
31.87
45.6
60.8
0.88
95%
28.42
32.21
38.0
50.6
0.73
96%
28.72
32.54
30.4
40.5
0.59
97%
29.02
32.88
22.8
30.4
0.44
98%
29.32
33.22
15.2
20.3
0.29
99%
29.62
33.56
7.6
10.1
0.15
99.1%
29.65
33.59
6.8
9.1
0.13
99.2%
29.68
33.63
6.1
8.1
0.12
99.3%
29.71
33.66
5.3
7.1
0.10
99.4%
29.74
33.70
4.6
6.1
0.09
99.5%
29.77
33.73
3.8
5.1
0.07
99.6%
29.80
33.76
3.0
4.1
0.06

Here we have some helpful links to solenoid valves suited to vacuum applications.Helpful Hint: If you are unsure of the amount of vacuum in your application there should be a vacuum pressure gauge somewhere in your system or check your vacuum pump label.

Helpful hint: remember that most general purpose solenoid valves will only control flow in one direction, be keep in mind that when installing a solenoid valve into a vacuuum application that the outlet side is attached to the vacuum, so the flow is correct from inlet to outlet. This does not apply to coaxial valves or angle seat piston valves which can control vacuum in either direction.

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