Pressure regulator

My first attempt for a throttle for my air engines.
I haven't printed it yet....

uses m3 screws, som old inner tire als diaphragm and a fairly strong spring that seems to take 2.5kg per mm compression.

Intake and exhaust are at the bottom for now.

It will fit nicely between de cylidners of my v-twin engine ;)

Be careful...

update 2019-06-02
It sort of works but takes a lot of effort and needs a fine adjustment.
seen the design and me putting a constant pressure on the lever, it won't work if operated manually. attaching a servo should work.