Valve Stem twisting

[EEENGRX]

What are some of the options or solutions to consider if its possible to restric airflow to a few valves that are thawing out to to avoid twisting the stems. Any ideas will be very welcome. Most of these valves have actuators with Air/Air Actuators with a speed of 1''/sec and have a size range of 1'' to 8'' max. Suggestions are very well appreciated

 

[LittleInch]

Eh? Thawing out?

You're going to need to explain your system a lot better than two lines.

Isolation valves maybe?

In any event, the valves should not fail or twist due to actuator max pressure unless something is incorrectly designed. Valve stems are normally able to withstand max actuator torque and actuators are sized not to twist valve stems. What's going on here?

 

[EEENGRX]

Oh yes, when the ambient is cold, sending pressure down to actuate the valves typically results in the stems getting twisted and damaged. This could be due to the sudden response of the valves after the very low temperature

 

[EEENGRX]

Eh? Thawing out?

You're going to need to explain your system a lot better than two lines.

Isolation valves maybe?

In any event, the valves should not fail or twist due to actuator max pressure unless something is incorrectly designed. Valve stems are normally able to withstand max actuator torque and actuators are sized not to twist valve stems. What's going on here?

What do you think about the actuator response time? what if the response time was slowed down?

 

[LittleInch]

Like I said - more details required if anyone is going to help you.

Actuators should be sized not to twist valve stems even for stuck valves so something doesn't sound right from the off.

So far you haven't really explained your system, provided any actual engineering data or pictures to help anyone understand your issue.

Whilst airflow can be restricted very easily in terms of pressure or flow, the fact remains that either will compromise the performance of the actuator, about which we know exactly zero. Do you get my drift here?

 

[EEENGRX]

Yes isolation valves

 

[EEENGRX]

Like I said - more details required if anyone is going to help you.

Actuators should be sized not to twist valve stems even for stuck valves so something doesn't sound right from the off.

So far you haven't really explained your system, provided any actual engineering data or pictures to help anyone understand your issue.

Whilst airflow can be restricted very easily in terms of pressure or flow, the fact remains that either will compromise the performance of the actuator, about which we now exactly zero. Do you get my drift here?

yes sure

 

[EEENGRX]

I will gather more details are get back to you. and possibly pictures