Allen Cain wrote:

"These employ the venture effect to syphon water from the tender into the

boiler by passing steam thru the venture throat which develops the suction
pressure to move the water."

Mere siphon is not enough. The pressure of the water entering the boiler
must exceed that of the steam pressure inside the boiler.

Gene Green


The kinetic energy of the siphon steam, condensing when
introduced to the "cold" feedwater, such that the mass of
the feed water, together with the exhaust steam will
open the check valve against the force of the boiler pressure.

As simply explained as possible: --
_http://en.wikipedia.org/wiki/Steam_injector#Vacuum_ejectors_
(http://en.wikipedia.org/wiki/Steam_injector#Vacuum_ejectors)


Mal Houck