Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Measuring Output pressure

Measuring Output pressure

Measuring Output pressure

Hi im a student trying to control/set the pressure of air going out of our air compressor, the air compressor has only one gauge for the tank and we're trying to control it by installing a valve and another gauge to read the output. is this correct?

RE: Measuring Output pressure

Why is outlet pipe connected (green hose) back to tank? The downstream (outlet) gage will read lower than the tank pressure depending upon the regulator valve setting.


RE: Measuring Output pressure

The outlet isn't connected; a zoom of the image shows the hose clamp touching (maybe) the tank, but there is typically no connector to the tank located there.

What you show is one possible way of doing it, although most configurations only have a single valve.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Measuring Output pressure

Good catch with image zoom showing hose end is NOT attached to tank! The regulated pressure output looks to be at the quick-connect coupler. The hose looks to be connected directly to tank pressure and in-line with pressure relief valve. I would not run my compressor with this hose connection scheme, since there is no regulator control!


RE: Measuring Output pressure

I also believe regulator is in middle (red knob). I believe tank connection is at left where relief valve (red knob) is located. Typically a small air compressor like this one has two pressure gages; one for tank pressure (at left) and one for regulated output pressure (at right). Perhaps the OP can indicate why the output hose is connected directly to tank pressure and not to the regulated output quick-connect coupler. If the manifold is connected to tank on left side, then I would connect the pressure gage (left one) directly to the relief valve, and move the shut-off valve and output hose over to the quick-connect coupler (with adapter) on the right side.


RE: Measuring Output pressure

Hmm, my impression is the exact opposite; the gauge on my right is the tank pressure, which is showing a non-zero value, then the air goes left through the regulator, through a first shutoff valve, through the second gauge, which is showing zero pressure, through the output valve, and finally out the flex hose. The gray hose behind the relief valve doesn't make much sense. But, typically, you would not have a flex hose coming from the tank, since it has the highest pressure and all the plumbing up to the final valve is typically solid metal.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Measuring Output pressure


If you expand the photo, it looks like the tank connection is on the left size directly under the pressure relief valve (red hat with metal ring and pin). I could be wrong, and this is getting to be a waste of time!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
Modern cars, trucks, and other vehicles feature an ever-increasing number of sophisticated electrical and electronic features, placing a larger burden on the wiring harness that enables these new features. As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - Modeling and Optimizing Wire Harness Costs for Variation Complexity
This paper will focus on the quantification of the complexity related costs in harness variations in order to model them, allowing automated algorithms to optimize for these costs. A number of real world examples will be provided as well. Since no two businesses are alike, it is the aim of this paper to provide the foundational knowledge and methodology so the reader can assess their own business to model how variation complexity costs affect their business. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close