Hi, Can anyone point me to a device for limiting the maximum rate of slew of a control valve? I'm looking for adjustable full scale stroke time adjustable from about 10 secs to about 1 minute. Something at or close to the valve is required, so that, for example, if the 4-20 signal line breaks the rate limit is respected while the valve moves to the failure position. Valves are to be driven by standard air actuators with I/Ps.
Would prefer something more accurate than would be provided by an air tank and restrictors.
Have looked at a couple of websites for the common manufacturers, haven't come across an obvious fit.TIA