# Control valve about help

**URL:** <https://forumautomation.com/t/control-valve-about-help/10528>\
**Category:** Valves\
**Created:** [July 13, 2022, 4:17am UTC](https://forumautomation.com/t/control-valve-about-help/10528 "2022-07-13T04:17:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Arda95](https://forumautomation.com/letter_avatar_proxy/v4/letter/a/f05b48/32.png) [@Arda95](https://forumautomation.com/u/Arda95)\
**Post date:** [July 13, 2022, 4:17am UTC](https://forumautomation.com/t/control-valve-about-help/10528/1 "2022-07-13T04:17:48Z")

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Hello my dear automation friends, I work as an instrument maintenance in the factory. Additional scope has been made, there are 15 valves, 5 of these valves are fail open, and these 5 of them want 20-4 ma instead of 4-20 ma. Reverse is requested, I wonder what the purpose is, not many people know. Respects.