Weatherhead proportioning valve

I'm in the middle of rebuilding my brakes, new lines, calipers, rear wheel cylinders and master cylinder. The master cylinder seals went and blew debris into the valve on the frame. I have the rebuild kit, but it must cover a few valve blocks. Mine is stamped 347-B, does anyone have a diagram of the valve?? I think I have it back together right but want to be sure.