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Solenoid Valve for gas

K

koma

Jan 1, 1970
0
Will a solenoid valve specified for "lubricated or non lubricated
compressed air" at 0-8 bar work with for example water?

(Also 0 to 8 bar pressure of course...)
 
H

Homer J Simpson

Jan 1, 1970
0
Will a solenoid valve specified for "lubricated or non lubricated
compressed air" at 0-8 bar work with for example water?

Probably not well. Is it a pilot type?



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K

koma

Jan 1, 1970
0
Probably not well. Is it a pilot type?


I don't think it is a pilot type since it is specified for operation
from 0 bar.
A pilot type needs some pressure to actually keep the valve closed,
right?

It is a spring return on this one.

I just don't understand how it can be specified for gas and not work
with for example water?
If it is airtight it should be watertight as well?
(For a non-pilot type valve that is...)
 
R

Rich Grise

Jan 1, 1970
0
Will a solenoid valve specified for "lubricated or non lubricated
compressed air" at 0-8 bar work with for example water?

(Also 0 to 8 bar pressure of course...)

Why can't you ask the place where you got the cylinder?

Good Luck!
Rich
 
P

Paul Hovnanian P.E.

Jan 1, 1970
0
koma said:
I don't think it is a pilot type since it is specified for operation
from 0 bar.
A pilot type needs some pressure to actually keep the valve closed,
right?

It is a spring return on this one.

I just don't understand how it can be specified for gas and not work
with for example water?
If it is airtight it should be watertight as well?
(For a non-pilot type valve that is...)

It will probably work for a while. But using equipment in environments
not originally intended may shorten its life.
 
H

Homer J Simpson

Jan 1, 1970
0
I don't think it is a pilot type since it is specified for operation
from 0 bar.
OK

A pilot type needs some pressure to actually keep the valve closed,
right?
Yes

It is a spring return on this one.

I just don't understand how it can be specified for gas and not work
with for example water?
If it is airtight it should be watertight as well?
(For a non-pilot type valve that is...)

I would try air type valves with hydraulic fluid, but water is a different
thing. It's corrosive and not lubricating. You'd do better to find a water
type valve.
 
J

Jamie

Jan 1, 1970
0
koma said:
Will a solenoid valve specified for "lubricated or non lubricated
compressed air" at 0-8 bar work with for example water?

(Also 0 to 8 bar pressure of course...)
use solenoid air valves.
They are designed for water because air gets wet how ever, you
need to check for the operating temperature of the valve if you
plan on passing hot water like we do at work.
 
J

joseph2k

Jan 1, 1970
0
koma said:
I don't think it is a pilot type since it is specified for operation
from 0 bar.
A pilot type needs some pressure to actually keep the valve closed,
right?

It is a spring return on this one.

I just don't understand how it can be specified for gas and not work
with for example water?
If it is airtight it should be watertight as well?
(For a non-pilot type valve that is...)
No, not very well. There is this issue of density, gasses at 22 L/mole vs
water at 18 mL/mole.
Then there is also the issue of viscosity, it involves how much flow you can
get through a given size hole. You can get more mass per unit time of a gas
through a given size hole than you can get of any liquid; in spite of the
1000:1 density difference.
 
R

Rich Grise

Jan 1, 1970
0
No, not very well. There is this issue of density, gasses at 22 L/mole
vs water at 18 mL/mole.
Then there is also the issue of viscosity, it involves how much flow you
can get through a given size hole. You can get more mass per unit time
of a gas through a given size hole than you can get of any liquid; in
spite of the 1000:1 density difference.

I'd also seriously worry about bang-bang control, since water isn't
(or is only negligibly) compressible - air will do some shock absorbing
for you.

Cheers!
Rich
 
J

jasen

Jan 1, 1970
0
Will a solenoid valve specified for "lubricated or non lubricated
compressed air" at 0-8 bar work with for example water?

water hammer could do it in pretty quick.

get a solenoid designed for water, mains ones are used in washing machines,
low voltage ones in irrigation automation.

Bye.
Jasen
 
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