How do one reduce the pressure?

  • Thread starter hanson
  • Start date
  • #1
319
0
Hi all.
I have a air pressure supply of 4 bar and I need to reduce it to say a few thousands Pa.
What I have now is a pressure regulator that can reduce the pressure to 0.1 bar, but I need a even smaller pressure.
Is there any device that I can use?
I heard something called throttle valve? is it something I can use?
It reduces pressure by percentage or to a certain level?
Please kindly help. Thanks.
 

Answers and Replies

  • #2
Q_Goest
Science Advisor
Homework Helper
Gold Member
3,001
39
A throttling valve doesn't reduce pressure, it is simply a restriction in the line. It will serve the purpose of reducing pressure if the flow rate is constant, upstream pressure is constant, and there is some inherent feature in the system which compensates for minor variations in flow. Without knowing what your system looks like however, it's best not to speculate on whether or not a throttling valve would work.

There are many manufacturers of very low pressure regulators. I'd suggest looking into Fischer to start.
http://www.fisherregulators.com/
 
  • #3
Mech_Engineer
Science Advisor
Gold Member
2,575
172
You should also do a search on www.globalspec.com based on your specific requirements to see if anything turns up.
 
  • #4
Danger
Gold Member
9,647
251
Would running a couple of regulators in series do it?
 
  • #5
stewartcs
Science Advisor
2,177
3
Would running a couple of regulators in series do it?

No, it has to be designed for low pressure applications.

CS
 
  • #6
Danger
Gold Member
9,647
251
Sorry, then, pal. I know nothing about this; I was just throwing in my 2 cents. Times like this, I really wish that I had an education.
 
  • #7
Mech_Engineer
Science Advisor
Gold Member
2,575
172
He's only trying to reduce 50 psi to around 0.5 psi, so 2 regulators in series wouldn't really be necessary. I did a search on GlobalSpec and found many regulators that have adjustment ranges similar to the OP.
 
  • #8
FredGarvin
Science Advisor
5,067
10
Depending on the fluid and the flowrates, there are indeed a lot of vendors that make applicable regulators. If it is a relatively low airflow requirement (when compared to large industrial applications), look at someone like Fairchild regulators or, for a more expensive but very nice regulator, look at Tescom.
 
  • #9
Actually a throttle valve may work if you need to fill a vessel up to a specific pressure and the regulators output pressure is to high you can slow the fill rate down and more accurately fill your application. you will need a separate pressure transducer downstream of the throttle valve probably about 0-100 torr. The fact that you need sub-atmospheric pressures makes me believe you are probably not dealing with a continuous flow device.

http://www.swagelok.com/search/find_products_home.aspx?SEARCH=/id-10000277/type-1" makes good products just don't use the brass ones!!
 
Last edited by a moderator:
  • #10
13
0
also take look to parker products. similar to swagelok

Rick
 
Last edited by a moderator:

Related Threads on How do one reduce the pressure?

Replies
17
Views
234K
Replies
2
Views
1K
Replies
3
Views
1K
Replies
20
Views
8K
Replies
2
Views
8K
Replies
1
Views
1K
Replies
6
Views
3K
Replies
4
Views
20K
Replies
4
Views
24K
Top