every engine needs an throttle valve, so i have asked my library. I found two different solutions, a piston valve (STUART Undertype) and a slide valve (Navy K engine). The advantage of a piston valve is that the actuating forces are independent of the effective vapor pressure. That's why I chose it.
The valve body i have built from three gun metal parts, they were silver soldered.
The soldered valve body.
FahrVent026kl.jpg (40.72 KiB) Viewed 37376 times
There are four ventilation holes in the piston to prevent it from sucking at "full throttle" position.
Piston with ventilation holes.
FahrVent036kl.jpg (41.63 KiB) Viewed 37376 times
The completed valve.
FahrVent044kl.jpg (57.66 KiB) Viewed 37376 times
Best Dietrich
Last edited by dampfspieler on Tue Jul 07, 2020 7:45 pm, edited 1 time in total.
to be sure that the measurements are correct and the valve actuation works as desired, I cut out the parts with the cutting plotter and built the quadrant on a trial basis.
The result can be seen here. I am satisfied and will now have the parts laser cutted.
Throttle valve - lever in closed position
FahrVent086kl.jpg (37.57 KiB) Viewed 37102 times
Throttle valve - lever in position "full throttle"
... I look forward to seeing it finished in polished bronze/brass or whatever.
some actual pictures of stainless steel and some other materials.
The valve is mechanical ready and all parts move well.
to make the size clear
FahrVent141kl.jpg (50.16 KiB) Viewed 36935 times
The backside
FahrVent143kl.JPG (37.31 KiB) Viewed 36935 times
The frontside
FahrVent145kl.JPG (37.69 KiB) Viewed 36935 times
The operating lever can be clamped in any position with the handwheel. The handle is stained and oiled beech wood, its shade is pear. The handle is screwed onto the operating lever, so it sits firmly. The pivot pins are made from the shaft with M5 x 0.5 mm thread and the head from 8 mm hexagonal brass, both are silver soldered.