French has dozens of words for what we simply call 'valves', though these can be qualified, as here.

A rotary airlock valve is like an écluse in that it has a barrier at each end. It is unlike an écluse in that neither end opens and that it works with air instead of water (!).

Imagine a disk with a certain number of vertical ribs across it, then attach a nother disk to those ribs. You have created a part with a certain number of cells opening to the periphery of the double-disk contraption.

Put the assembly on a horizontal shaft (thereby creating a rotor) and place it inside a circular void with an opening at the top corresponding to the size of the cell openings, and another opening at the bottom. Place a hopper at the top and fill it with dried haricot beans. The beans will flow into the first cell. As the rotor is turned, successive cells will be filled. When each cell reaches the bottom, it will discharge through the bottom opening, giving you your dose of beans.

The same principle is used on our cat's automatic biscuit feeder.

No idea for your écluses moteur" or écluses sous tarare.

--------------------------------------------------
Note added at 10 hrs (2023-05-09 08:24:44 GMT)
--------------------------------------------------




--------------------------------------------------
Note added at 15 hrs (2023-05-09 12:51:29 GMT)
--------------------------------------------------

Do you have context for where écluse moteur is used? For the moment I'm left wondering if this is not an extension of the French moto-pompe thing ... When an English-speaking fire brigade turns up to remove water from your flooded cellar, they bring pumps. It is assumed the pumps are associated with motors i.e. they are not turning up with those hand-operated pumps on a horse-drawn carriage of olde. French sapeurs-pompiers will of course turn up with moto-pompes to do the same thing. So maybe you customer is talking about the 'rotary airlock pump/motor unit'.

As for your écluse sous tarare, I can only imagine the (rotary airlock) pump is placed directly beneath a winnowing machine (tarare).

"Winnowing is the process of removing the outer shell from the cocoa beans. We refurbished a Spanish-made antique winnowing machine, converting it to run with our factory’ssolar-power system. The machine first cracks the roasted cocoa beans into pieces of cocoa meat and shell. The pieces are sent cascading down a series of screens by means of vigorous vibration. As they fall through chutes under the screens, a vacum system sucks away all the shell and dust material and forces it into a collection bag. The pieces of cocoa bean meat or “nibs,” as they are called in the chocolate-world, fall through the chutes and into collection buckets and are ready for grinding"
https://www.grenadachocolate.com/tour/winnowing/#:~:text=Win...


--------------------------------------------------
Note added at 15 hrs (2023-05-09 13:07:38 GMT)
--------------------------------------------------

It is possible that this tarare made for separating heavy from lighter particles is actually a cyclone separator these days, as you will see here:
https://sediroglu.com/se-ac-lecluse-dair-cyclone/
https://www.usinenouvelle.com/expo/ecluses-rotatives-sous-cy...
https://girardeau-air.com/produits/ecluses-rotatives/

Rotary airlock placed under the cyclone is used to control the bulk solid discharge from the cyclone under pressure or vacuum and feed equipments like conveyor, screw feeder, mixer etc.
https://polimak.com/en/urun/rotary-airlock-applications/#:~:...

"Rotary valves can also be placed under a cyclone. This applies a pressure seal between the storage and conveying systems so material flows uniformly from the outlet."
https://www.pneuvay.com.au/pneumatic-conveying/news/Rotary-v...