Neal:
I do not know the brand and model number of mine. I looked at it before I mounted it, and found no data plate. I suspect it is a Gresen because that seems a dominant brand, and there is probably a cast logo on it somewhere.
Mine seems to reduce the rate a bit, but not the pressure. That is pure impression, however, since it hooks the lines to a completely separate circuit from that previously used, so the difference may not be the valve, at all. The tilt function (Valve inactivated) seems unaffected, so there really isn't reason to suspect that flow is much affected when the diverter valve is activated.
The lift and tilt hydraulics all have a fairly fast leakdown rate on the PT, even cold, so leakdown in the new valve wouldn't be noticable.