×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

HAVE YOU EVER HEARD OF SOMEONE DOING THIS?
5

HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

(OP)
Has anyone ever heard of the placement of a valve into (through) a piston before?

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

Sure, depends on the application and type of valve. I have seen this in an aerospace use. Please describe the application and reasons.

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

This is done all the time on certain types of small vaccumn/pressure compressors. Many are manufactured by GAST or Thomas.
 

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

I would guess that the "small" reference is pretty important.  I wouldn't think that you would be successful pushing very many hp through a set of valves on a piston.  

David

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

Ok, I take the back the "small" statement.  I've never heard of these beasts being marketed (and I've been involved in a bunch of Ajax acquisitions), any idea what their market is/was?

David

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

I've operated two of the IR VIP machines.  One was in gas gathering near Canadian, TX. The compressor was driven by a cat398.  The other was in air service, compressing air to a Nitrogen generator system, again driven by CAT 398.

Notice I said "was".   

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

The IR VIP was a great idea, but it was all downhill from that point forward:)

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

(OP)
Thanks for the info everyone!  To answer your question, IsraelKK, the application is for a pressure boost from roughly 175psi to 500psi and a volume of about 240 cubic inches...roughly.  So what happened with this IR VIP machine?  Is it now defunct?

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

Recently there is a safety issue raised by IR on VIP units. VIP units are there in market for almost 10years.

RE: HAVE YOU EVER HEARD OF SOMEONE DOING THIS?

VIP compressors are a very rare beast. Only end user I know outside of the US is Petrovietnam (Vung Tau),pumping natural gas, mol 21.2.  
These machines are 4 cylinder, single stage. 900 rpm.
Inlet 675 psia @ 77 F
Delivery 1643 psia @ 190 F
The inboard and out board heads act as inlet valves. and the pistons double as (delivery) valves,they also carry the piston and rider rings.
Not (in my opinion)user friendly when it comes to maintenence.
Plenty of information available on Dresser site.

FYI, Thomassen also make use of a valve in piston on their "floating piston" machines, but this is to pressurise the piston which allows the gas to bleed back and float the piston during operation.
 

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!


Resources