# Differential pressure ratio for selection control valve type

**URL:** <https://forumautomation.com/t/differential-pressure-ratio-for-selection-control-valve-type/1236>\
**Category:** Valves\
**Created:** [August 7, 2016, 11:46pm UTC](https://forumautomation.com/t/differential-pressure-ratio-for-selection-control-valve-type/1236 "2016-08-07T23:46:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![automate](https://forumautomation.com/letter_avatar_proxy/v4/letter/a/51bf81/32.png) [@automate](https://forumautomation.com/u/automate)\
**Post date:** [August 7, 2016, 11:46pm UTC](https://forumautomation.com/t/differential-pressure-ratio-for-selection-control-valve-type/1236/1 "2016-08-07T23:46:34Z")

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What is limitation on differential pressure ratio for selection control valve type i.e Ball type,Butterfly Type? What is international standard for this point?