×
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

Retainerless Duo Wafer Check
2

Retainerless Duo Wafer Check

Retainerless Duo Wafer Check

(OP)
How is this design different from regular wafer check and what are High performance Duo wafer check?

Please help!

RE: Retainerless Duo Wafer Check

A duo check valve is considered a sub-category of the wafer check valve. The main characteristic of a duo-check is that the disc is split in two, and opens similar to a butterfly valve. The original/standard wafer check only has 1 disc.

Here's a link to an image of a duo check:
http://www.aguamarket.com/sql/productos/fotos/V%C3%81LVULA%20RETENCI%C3%93N%20DUO%20CHECK.JPG.

Here's a link to an image of a "standard" wafer check:
http://upload.ecvv.com/upload/Product/20095/China_Wafer_Check_Valve20095515271310.jpg.

Most wafer checks nowadays are duo style.

Heather Smith
My interests: Alloy valves, duplex valves, super duplex valves, 6Moly valves, inconel valves, incoloy valves, alloy 20 valves and titanium valves.

RE: Retainerless Duo Wafer Check

(OP)
Thanks for the reply.

What makes a duo wafer check a High performance Duo wafer check?

RE: Retainerless Duo Wafer Check


A recent thread in this forum discuss what a high performance BFL valve is  thread408-266485: what is high performance type for butterfly valve?

This might be relevant.

Without retainer indicates perhaps a direct metal to metal sealing with direct contact, again the definitions for HP butterfly valves might be significant.

The above said, i must admit that I have never seen  this descriptin in connection with a check valve.

On the other hand it is quite common that the description for a check valves leans towards somthing used in 'an almost similar' , but older/previous solution, without adeqatly giving the necessary fluid and operation parameters necessary to dimension and select the optimum type: eg.: correct dimension, type, placement etc. necessary to avoid pressure peaks and slamming or gulping operation, partially open valve, minimum pressure loss and soft opening and closing.

The correct solution in you case might be a metal to metal seated disc check valve, for instant of type gestra disco: http://www.flowserve.com/files/Files/Literature/ProductLiterature/FlowControl/Gestra/810294.pdf or similar types of same brand or other

RE: Retainerless Duo Wafer Check

Retainerless wafer duo check valves have been designed by Goodwin UK.
It is a design that allows all internals to be assembled from the downstream side without any potential leak pass to the athmosphere.
Have a look at www.checkvalves.co.uk
 

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