×
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

ventomat air valves

ventomat air valves

ventomat air valves

(OP)
Hi,

does anyone have any experience of using the ventomat air valves as a surge protection system, instead of using the standard surge vessel and compressor etc?  All of the information I have been able to find so far is supplied by ventomat themselves and I was hoping to get some independent verification that the units work as claimed.

RE: ventomat air valves

Check out thread408-89648 for a great discussion.  The gist is that they can help from a transient perspective but may allow contaminated water into a distribution system.  I’m assuming this is a potable water system since it’s in this forum.  Also, it is important to note that they are not a panacea for transients either, still need to do the analysis with these valves.

RE: ventomat air valves

The ventomat is a slow closing air valve. It lets air into the pipeline under negative (sub atmospheric pressure) and slowly releases under positive pressure. Air in the pipe attenuates the surge.
You need to do the transient analysis. Obviously the Ventomat valve will not do anything if the pipeline pressure does not fall below atmospheric.
The non slam slow closure characteristics also prevent transients during pipeline filling. This can be a problem on filling long pipelines.
As Ccor notes allowing air into a potable water pipeline is a potential source of pollution and may not be permitted as a solution. In such cases I have installed the valves on riser pipes above ground in a valve house with screened ventilators.

There are other slow closure non slam air valves on the market.  Ventomat is generally recognised as a good product. .

RE: ventomat air valves

Further you should note despite claims few transient analysis programmes are able to model two phase (air/water) flow and once air is admitted into the pipeline through air valves the analysis thereafter will probably be unreliable.

Also, for clarification, obviously as noted above the use of non slam air valves is only an option if the transient analysis shows the pressure to fall below atmospheric. In this case you should also examine other options for transient suppression to maintain positive pressures.  I generally consider allowing air into the pipeline as a last resort solution.

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