There are 2 types of valve?s that we will like to test, one of them vent to atmosphere and the other one vent to pipe.
We got high precision gauge to measure with.Normally (as for all valves) the manufacturor will test themselves, and you should be able to get advice from the actual or any competitive producer.
For this small and narrow range it is of course important that measurment instruments and testrig are adapted to register accurately, including sufficient  'decimals' to register small percentage variations when testing.The problem is that this  gate valve is so old that the manufacture no longer exists sad So we are not able to get support from this side. What I was hoping is that there are some kinds at standard that describe how it should be carried out.
We have very accurate and calibrated measurement instruments so that?s not a problem at all...

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