'mix valve' design for lift station
'mix valve' design for lift station
(OP)
I am doing a upgrade for an exisiting lift station with a siltation problem. It has been suggested to use a 'mix valve' design that will re-suspend the sediment when pumping begins.
Anyone have experience with this design? I've never heard of it.
Anyone have experience with this design? I've never heard of it.





RE: 'mix valve' design for lift station
http://www.usfilter.com/water/ProductDescription.asp?WID=25&PID=261
At least contact them, they might know where to start looking.
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
The valve is not costly by itself but I think it can only be fitted to Flygt pumps. It attached to the pump casing, not at the discharge pipeline. It stirred up the sediment around the pump when the pump starts. It also allows you to set the "flushing" time. It works well in small pump pits and chambers. However, if you have a large tank, you should consider putting a submersible mixer for continuous mixing.
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
thanks
RE: 'mix valve' design for lift station
The manufacturer is ITT Flygt. It is called a 'flush valve' and they put it under the heading "mechanical accessories".
They have an Acrobat File describing the flush valve, try this one:
http://www.flygt.co.uk/19457.pdf
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
I think Flygt has a patent on the flushing system, and just to add my two cents, it is really horrible in practicle applications....
BobPE
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
Perhaps I should also ask where your pumps lie in the process. Are they before the coarse screen, after the fine screen or somewhere in between?
The 1/8 pipe is a good idea but surely will be cocked up pretty soon even your pump is put after the fine screen. However, you can still use this idea but put pressurised water or air (depends what is easily available in your plant) to stir up during the start-up period. The water/air can be simply control by a solenoid valve. Or you can use larger flushing pipe (i.e. 1 1/2" or 2") control by a valve and flush with the pumped sewage during the start-up period.
There are lots of ways to tackle this problem and you should compare the cost of different method to make your right choice.
BobPE : What is your horrible experience on the Flygt 'flush valve'? I used that in 0.5% sludge and found that it works quite alright.
RE: 'mix valve' design for lift station
I have had the opportunity to retrofit the pumps into existing wastewater pump stations as well as designed new pump stations. You kinda hinted to the problem that is blockage which in most applications is quite bad since they are primarily used in smaller applications, where screening is often no present or quickly neglected after start up. This coupled with the decreased efficiency of the pump makes them not that good of a choice in my design book.
I wouldn't expect a problem with the pumps in a sludge application other than the efficiency.
BobPE
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
Also, consider a high pressure air injection into the bottom of the wet well to stir the solids at the begining of the run cycle.
RE: 'mix valve' design for lift station
KRS Services
www.krs-services.com
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
KRS Services
www.krs-services.com
RE: 'mix valve' design for lift station
RE: 'mix valve' design for lift station
KRS Services
www.krs-services.com