I am trying to select a 3-way general purpose universal flow solenoid valve and came across a value I don't understand. The valve needs to handle .6 gpm at maximum of about 2 psi pressure drop so I figure a CV of about .400 to .500 would work. But 3-way valves have two CV ratings. One called "body" and the other "stop". For example a valve may have a Body CV of .500 and a Stop CV of .180. What exactly does that mean?
If this means the pressure drop will be different for the two directions I have a problem as I need the upstream pressure to be the same in either direction. In the above example on direction will have a drop of less than 2 psi and the other more than 8 psi.