Quick Connect Flow Oscillations
Quick Connect Flow Oscillations
(OP)
Our plant uses small diameter hoses (1"nps) with quick connect fittings to slurry water and resin mixtures. These quick connects have spring loaded, internal reverse flow stops in both the plugs and sockets to reduce spills when connecting and disconnecting. Severe flow oscillations and flow stoppage has occured when moving viscous mixtures, which is thought to be due to the 'floating' stop valves in each fitting moving back and forth causing intermittent flow restriction.
I am looking for anyone with similar experience and a solution to this problem.
I am looking for anyone with similar experience and a solution to this problem.





RE: Quick Connect Flow Oscillations
Ted
RE: Quick Connect Flow Oscillations
Here is a sketch provided by our Maintenance staff. Apparently this floating stop valve is not a problem with our 'older' style of quick connects. Perhaps the spring compression was higher or there was a back stop which prevented excessive movement.
Bambie
RE: Quick Connect Flow Oscillations
Good luck,
Latexman
RE: Quick Connect Flow Oscillations
Good luck,
Latexman
RE: Quick Connect Flow Oscillations
Ted
RE: Quick Connect Flow Oscillations
RE: Quick Connect Flow Oscillations
According to our old hands in Maintenance, this is definitely a "new problem in an old operation", caused by a recent switch from one quick connect Manufacturer to another.
I don't have any information on the nature of the slurries but I have attached a .doc file for viewing. The two sketches show that the stop valves are free to shunt back and forth regardless of the flow direction.
If this is a common occurrence in industry, I won’t be so quick to blame the new design.
RE: Quick Connect Flow Oscillations
Where were they made? If China, or India, it could very likely be a design or manufacturing error. I've seen numerous examples of a product being sourced to China or India with engineering documentation that was not complete or 100% accurate or maybe not understood and followed exactly.
RE: Quick Connect Flow Oscillations
A different coupling construction which has a fixed pintle to push the check valve poppets open would work. A larger coupling with less flow loss in the slurry would reduce the forces acting on the check valves.
Ted
RE: Quick Connect Flow Oscillations
Ted, By a "fixed pintle" do you mean a back stop for each poppet that would limit how far open they can move when engaged? This is also Maintenance's suggestion.
I have attached a .pdf of the sketches.
Bambie
RE: Quick Connect Flow Oscillations
Ted
RE: Quick Connect Flow Oscillations
Good luck,
Latexman
RE: Quick Connect Flow Oscillations
http://www.snap-titequickdisconnects.com/products/...
Check valve poppets held open mechanically.
Ted
RE: Quick Connect Flow Oscillations
Thanks for this link, I will inquire further.
Latexman,
Suffice it to say their product quality assurance program didn't meet our company's 'new' standards.