Emerson Exchange 365

Tip #80: Use Sliding Stem Valves for Tighter Control

For pH control, where the requirements for precision are extraordinary, the reagent flow rates are so low that I was never tempted to use rotary valves other than as expendable on-off valves for pulsing. I once used small solenoid actuated ball valves for pulse duration control because the frequent stroking would wear out any other [...] Read the full text.

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