It actually works out ok once the filter is established and the flow settles in at it's normal operating level. It also helps that I am using a lily pipe inflow, so the spray bar is not in use. But for the first month, before the filter has matured, the flow is a little much.
So I have a few votes for yes you can use the valve on the outflow side, and a few votes for no, don't do it. Anyone have any reasons to go with the assertions? I am leaning towards it being ok on the outflow side so long as it is not overly restricted. The pump would still get laminar flow with no cavitation, so the only issue is pressure on the fittings and valves, which seem substantial enough to absorb a 25% increase in pressure. I would like to hear reasons for it being bad.