Diagram of the early Stölzel valve (an early model Stölzel valve with horizontal guiding screw)
Left: valve operated
Right: valve not operated
Far right: turned through 90 degrees
a = valve casing
b = piston
c = valve loop with slide
d = main tubing
f = touch piece, finger tip, lever
g = valve stem
h = top valve cap
l = return spring
See also photographs of Stözel valves
© the authors, 2004.
This page updated 5.1.05