Negative pressure sampling valve
Thread Content
The negative pressure inside the reactor is 1 MPa. Samples from the reactor are taken in a negative-pressure environment. Air must not enter the reactor. Is there a better way? The method we’re using currently involves adding two ball valves below the sampling bottom valve (with the bottom valve kept in the open position); by closing one ball valve and opening another, sampling is done gradually, which is quite troublesome. Moreover, the ball valves tend to break easily and allow air to get in. Are there any more suitable valves for reference? Thank you to all the experts and masters for offering some suggestions; thanks a lot!
I don’t believe that the negative pressure is 1 MPa. If the negative pressure is within a reasonable range, it can be used as a small pump to draw out the material from the reactor for recycling, with a sampling point installed at the pump outlet. You can consult the sampler manufacturer.
We have encountered the same situation as well – no mature, corrosion-resistant specialized products available. The sampling tube I have made currently is basically the same as one used upstairs; the only difference is that an additional vacuum valve has been added between the two valves. Before sampling, this section of the tube is evacuated, then the upper valve is opened to allow the material to flow out, after which the upper valve is closed and the lower valve is opened. It’s very troublesome. Thank you!
Negative pressure sampling systems all use double valves; we employ PPH ball valves, which are corrosion-resistant
What kind of vacuum valve do you use?
Is a vacuum pump needed, or manual evacuation?