sampling valve 1

[embjh]

I am looking for a solution to sample oil (300ml), recirculating over a pump back into its own tank.
A simple tap can not be used as "bottom" tankvalve, as it is not reliable.
We do have experience with a bypass stream but is a messy operation (maybe not the right type of bypass (or operator..)).
Of course should the sample point be as clean as possible, so any voids need to be avoided.

 

[JimCasey]

There are specific "sampling" valves. Picture a ball valve with a "pocket" in it. When it is turned to the "sample" position, the pocket is isolated and drains to a lab-type sample bottle that screws into the side of the valve.

Here's one.

http://www.flowserve.com/eim/v/inde...010VgnVCM1000005e191eacRCRD&vgnextfmt=default

Other types exist: One style pushes a piston into the line and opening a void behind the piston which then fills, then when the piston is retracted, the void drains into a sample cup.

 

[embjh]

Thanks Jim.
The flowserve thing looks workable, some concern about the remaining dripping after sampling. The second, I recognised but I do not want to rely on the small seal for tightning....
Anybody with experience in using the flowserve type of sampler?

 

[Ashereng]

How about a block and bleed valve and some tubing?

Century Valves makes several models, you may want to take a look.

http://www.centuryvalve.com/

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[NGiLuzzu]

embjh,
maybe you'll find useful to check out the following webpage:

http://www.tycoflowcontrol-na.com/products_results.asp?Selection=Special+Valves&m=1

Hope this helps, 'NGL