
BRONKHORST HIGH-TECH B.V.
9.17.057 page 22
4.1.5 Maximum pressure drop
Forsolenoidoperatedcontrolvalveswithsmallorificesthemaximumallowablepressuredropforgasesisaccording
tothegeneraltablebelow.PleasekeepinmindthatthepressureratingforFLOW‐SMSis10baronly.TheKvvalueof
theshut‐offvalves,infrontofandbehindtheflow/pressurecontrollers,mustbe1.5timeslargerthantotalKvvalue
ofthecontrollers.Otherwisethepressuredropovertheshut‐offvalvewilldisturbthecontrolperformance.
Diameter[mm] K
v
Normallyclosed
pmax.[bard]
Normallyopened
pmax.[bard]
0,05
0,07
0,10
0,14
0,20
0,30
0,37
0,50
0,70
1,00
1,30
1,50
1,70
2,00
4,33x10
‐5
8,48x10
‐5
1,73x10
‐4
3,39x10
‐4
6,93x10
‐4
1,56x10
‐3
2,37x10
‐3
4,33x10
‐3
8,48x10
‐3
1,73x10
‐2
2,93x10
‐2
3,90x10
‐2
5,00x10
‐2
6,63x10
‐2
40
30
30
30
30
30
30
30
24
12
8
6
5
3,6
30
20
20
20
20
20
20
20
15
8
5
n.a.
n.a.
n.a.
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