6 replies to this topic

[Ali4269278331]

hi guys

thanks for your helps.

in the our site, the designer use of wafer check valve on the flare gas line. this check valve install on the vertical line. the outlet gas goes to the flare. based on ISOMETRIC documents location and flow direction are correct. my question is do you think this check valve type should be on the vertical line or horizontal line? so, if the gas back to vessel can the check valve flapper close the back flow?

 

thanks  8888888.jpg   39.19KB   0 downloads  888888888.pdf   249.58KB   11 downloads

[breizh]

Ali,

 

A google search:

The Wafer Check Valves are designed to be located within the bolt circle of the pipeline flanges. They are suitable for both vertical and horizontal lines provided that in the latter case the flow direction is upwards.

Breizh

[Ali4269278331]

Ali,

 

A google search:

The Wafer Check Valves are designed to be located within the bolt circle of the pipeline flanges. They are suitable for both vertical and horizontal lines provided that in the latter case the flow direction is upwards.

Breizh

 

Yes, but why some guys imphesized that this type must be install on horizontal piping?

[latexman]

Yes, but why some guys imphesized that this type must be install on horizontal piping?

 

I found one that can be installed vertically upflow.

 

Take a look at the picture below and the attached brochure. If the fluid is flowing down, against the flow arrow, the check valve will not open.  If the fluid is flowing up, with the flow arrow, the check valve will open.

 

 Screenshot 2024-04-25 150649.png   47.83KB   2 downloads

 

 Technical-Guide-Dura-Cast-Iron-Wafer-Check-Valve.pdf   259.34KB   12 downloads

[breizh]

Hi,

Who are some "guys", better to understand the working principle of this technology and refer to installation guide.

This is the way an engineer should work.

Breizh

[Ali4269278331]

 

Yes, but why some guys imphesized that this type must be install on horizontal piping?

 

I found one that can be installed vertically upflow.

 

Take a look at the picture below and the attached brochure. If the fluid is flowing down, against the flow arrow, the check valve will not open.  If the fluid is flowing up, with the flow arrow, the check valve will open.

 

Screenshot 2024-04-25 150649.png

 

Technical-Guide-Dura-Cast-Iron-Wafer-Check-Valve.pdf

 

Ok, my flow orientation is toward down. at this moment the flapper became open but if flow go back the flapper cannot close the fluid flow route.this is my problem. naturaly this type of check valve work without spring behind on flapper.

[latexman]

Ok, my flow orientation is toward down. at this moment the flapper became open but if flow go back the flapper cannot close the fluid flow route.this is my problem. naturaly this type of check valve work without spring behind on flapper.

Then you are in need of a check valve that works vertical downflow. I’m pretty sure it will have spring. A Google search led me to https://www.dft-valv...-vertical-flow/

I’ve never used one of these, so beware.