Correct never throttle a gate valve, they should be either fully open or closed. Globe valves can be throttled but in the case of the Purasan tablet dispenser the water supply is thru 1/2" vinyl tubing and the flow is adjusted in ounces not gallons.
I thought a brass needle valve but then I thought about the rachet type flow control that came with the Purasan and opted for a KISS solution. A spring clamp used by wood workers, so far it's working.
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