That's the ones I am familiar with and have had pretty good luck with them NOT sticking closed, and some of the systems are on some rather nasty well water, and some run antifreeze. Generally the only problem I've had to deal with is them sticking OPEN, as I wrote about before, or an occasional motor failure.
Is it possible the 24 Volt transformer that operates the valves is weak, or there is voltage drop in the circuitry somewhere, not giving full power to the motors? (Or are they the more rare 120 Volt units?)
When you say you are turning on the "nut" to loosen them, do you mean the flats on the stainless steel stem that the operator fits over?
When you have replaced parts, did you replace the valve kit, or the whole valve, or the operator?
If the operator has not been replaced, either by itself, or as part of a complete valve, I would really wonder if it is not actually the motor or gear train that is sticking, as I have never seen the stainless stem stick so tight in it's brass bushing a good operator couldn't open it.
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