Flow Sensor Before or After Gate Valve?

[nickkohrn]

Does it matter whether a flow sensor is placed before or after a gate valve? I don’t think that it would make a difference since the flow is regulated at both points, but this is my first time plumbing a system, so I want to make sure that either place would be okay.

 

[Tom Blevins]

Most gate valves are smaller inside unless you have a full port valve, so these will have an effect on you flow a tad bit.

I always buy the next size up so I am on point.

 

[ryeguyy84]

I'd go after, no real reason but in my head that feels right.

 

[BoSalman]

I would go with the valve after the flowsensor..

In theory, if you put the valve upstream of the sensor, it may disturb the "input" reading of the sensor..

 

[Dabcrusher]

I have mine on the overflow since the return pump has 2 reactors so whatever is left goes in the tank and what goes in must come out plus the return line is 3/4 in and the overflow is 1 in