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Thanks for the heads-up on the various definitions of Lift :) I saw the datasheet of the one valves I am considering and it mentions Cv vs lift. I guess that manufacturer uses lift instead of %open.

Thanks all for your useful advice. Could you please also comment on my first question regarding the differential pressure used in Cv calculation? :) Forgive me for my naivety but from my understanding, it's just the pressure loss caused by the control valve that will of course vary with flow...

We need to install a control valve in our water filter test system. I see online a lot of formulas and calculators to determine the Cv. However, for it's calculation pressure drop is needed. Is it the max acceptable pressure drop of the valve or something else? Secondly, the formula also...

To clarify, "Only if you get the water flowing past the sample intake tube to be 14.5mm/sec will this idea work, but then I guess the solid material will start to drop out", you mean the 6 mm tube here, correct? Since the sampler has a pump that maintains the flow rate, the sample velocity in...

The intention is to draw a sample isokinetically so the depending upon the main flow rate the sample flow rate should be adjusted. This ensures particles of different sizes will be drawn in the sample and avoid oversizing (more bigger particles counted) or undersizing (more smaller particles...

@EdStainless As mentioned just above, this is an inline sampler and the intention of this oversample method is to overcome difference in sample flow velocity and the main flow velocity. And that is exactly why I plan to use to a pump. The pressure might be sufficient but the pump will ensure...

@LittleInch This sampler is infact supposed to work inline and measure the particle counts. But with the difference in the sampling flow rate and the test flow rate (mentioned in the drawing) I suspect we wouldn't have representative sample unless we do isokinetic sampling Regarding the mixing...

I am trying to measure the no. of suspended particles in water using an inline particle counting sampler. The process setup looks as below: To get a representative sample, the sampling process should be isokinetic. However, the sampler intake rate is fixed at 25 ml/min leading to an average...

Thanks for the suggestions. I don't think 1% deviation should be an issue but I prefer the horizontal installation with a backpressure valve and avoid a new U-bend.

@LittleInch, thanks for the clarification regarding the backpressure valve. It will be a useful addition to the current system. @danW2, I did consider installing it vertically. In the existing layout (as shown above), it is possible to install the meter vertically in the U-bend next to the...

@ 1503-44, Thanks for your detailed feedback. Perhaps it wasn't clear from my previous posts that the purpose of this test rig is to load the filter with contaminants at a constant flow rate. So we don't need to control the pressure drop across the filter. Rather we record the increase in...

@ 1503-44 I don't know a lot about the backpressure regulator valves but after a quick reading on the subject, I doubt it would be appropriate in this setup. It is a filter test setup. We test the filters by presenting them the challenge fluid at a constant flow rate and record the pressure drop...

Great articles and video resources guys. Thanks :) @LittleInch Yes that's correct. Between C & the test vessel a diluted slurry solution will be injected so X will not be a good installation location. Providing even up to 10 x pipe diameters wouldn't be an issue in our layout. Regarding the...

The test fluid is water and the tank looking thing is just another vessel with filters. I know it's not something standard but the black box represents the water reservoir instead of showing the whole big thing :)

The drawing below shows the future layout of our test system. For the position of the magnetic flow meter, I think if provided a few pipe diameters straight length upstream and downstream of the flow meter, it's location wouldn't affect too much on the flow measurement and ultimately the...

Thanks all for your feedback :)

@ 1503-44, in most of our filter testing, we only maintain a constant flow rate and the pressure drop across the filter is just recorded. However, the other variant of this test, requires a maintaining a constant pressure drop across the filter and the flow rate is varied. So answering to your...

I do favor the discharge setup above the tank for the sake of simplicity compared to drilling a new inlet below the water level. However, I have one concern regarding the discharge above the liquid surface. I suppose it may create unnecessary agitation and cause aeration. I think if the...

@ 1503-44 Would cutting off the last bit of the return line and discharging over the tank rim obviate the vacuum breaker or offers any other advantage?

Thanks for explaining the difference :)