miniron wrote:
8)
Morris 1100,
You are the man!
Those pics are exactly what I was hoping for. I can now see how the pistons and valves etc work. The vacuum pump was the mystery bit as I wasn't sure if it was just a simple plunger type pump or something a bit more complicated with diaphragms etc. Its just a simple plunger with 2 sealing rubber washers sandwiched between those plates.
The check valves in the bases can be replaced by separate inline check valves so it looks as though a both pumps can be made from some small hydraulic cylinders with separate external check valves. From the pics it looks as though the pressure pump piston is about 3/4" diameter and the vacuum piston is about 1 1/2" to 2" diameter.
Are you able to take some measurments or is the pump all back together?
Thanksfor your help.
Regards
RonR
Hi Ron, the pump is back together but you are just about on the money with the measurements.
The pressure pump was 3/4" and I never measured the vacuum pump but I would guess 1 1/2" (I just did a rough measurement using the photo of the pump in the 4" vise and it looks like 1 1/2"

)
The pressure pump seal looks like a hydraulic seal of some sort. I don't recall any numbers on the seal.
As you can see by my photos the way the valves are so simple it would be easy to make or just fit off the shelf check valves.
The only thing I would change in the design would be to fit a second tank to drain and evacuate the system into rather than contaminating the single tank.