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sampling valve

sampling valve

sampling valve

(OP)
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.

RE: sampling valve

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/index.jsp?vgnextoid=f22bc512958f8010VgnVCM1000005e191eacRCRD&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.  

RE: sampling valve

(OP)
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?

RE: sampling valve

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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