I need a valve for controlling the flow of drilling cuttings. I can't use a ball valve cause it will block up with drilling cuttings. In fact, all valves that control the flow by "strangle" are out of the question.
I need a valve that can handle small rocks and stuff without blocking up.
The pressure will not be high. Max 0,5 bar.
Normally one regulates the flow of the coolant to the drill BEFORE it gets to be a slurry with the cuttings.  COntrolling the coolant INTO the drill is relatively simple.  Controlling the slurry coming OUT of a drill sounds like a job for a pinch valve.
he pinch valve is designed specifically for lumpy slurries, and the sealing/throttling element is a reinforced rubber hose.  Rubber is nicely resistant to erosion/abrasion, as demonstrated by auto tires that easily last 50,000 miles.
There are pneumatic pinch valves that use air pressure in a chamber on the outside of the tube to collapse the tube shut.  With this method the tube is free to conform around rocks and chunks.  Without the air pressure, the process pressure inflates the tube to an essentially round, obstructionless flowpath.  And, if you are wondering, I do not work for a pinch valve company. 

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