AUTOMATIC in its action, unique in its simplicity and absolutely
reliable in its time-tested design, the Penberthy Automatic
Injector is the result of 40 years of careful manufacture and
The entire mechanism contains only two moving parts, both of
which are simple heck valves built into the injector where they can
never get out of adjustment or be subject to trouble.
All that is need to start it is to open the steam valve full,
then open water supply valve full and adjust to point where it does
not overflow. Without any other adjustment, the injector
immediately draws up water from the supply tank, passes almost
instantly through the five cycles illustrated below and continues
to force a steady stream of water into the boiler until it is shut
off. It is a perfect restarting, automatic machine. Once it is in
operation, no attention is necessary to keep it going.
If the flow of water should be suddenly broken by any cause,
such as a sudden jar or jolt as in the case of a traction engine or
road roller, or in the case of a marine boiler by the vessel
throwing the sea cock out of the water for a moment, the injector
will pick up the water and again establish the steady flow into the
boiler, automatically, without the manipulation of a single valve
or the least attention from an attendant.
It is this quality which has made ‘Penberthy’ a by-wood
among all engineers.
The Penberthy delivers water to the boiler at from 160 to 212
Fahrenheit, according to operating conditions. The stock model
injector will start with steam pressures as low as 20 to 25 lbs,
operating on a three foot lift. With from 60 to 80 lbs, steam
pressure available it will operate on lifts of 20 to 24 feet.
Special Injectors can be furnished to meet all conditions and
The Penberthy Injector Co. flyer which appears on pages 19, 20,
21 and 22 describes and shows how an injector works. The copy was
sent to us by L. D. Solomon of 1205 E. Logan, Moberly, MO 65270,
who thought it would be of interest to our readers.
WHEN THE STEAM VALVE IS OPENED HIGH VELOCITY STEAM RUSHES
THROUGH- THE JETS OUT THE RING VALVE AND SPILL HOLE OPENINGS-AND
ESCAPES THROUGH THE OVERFLOW VALVE
SUCTION CAUSED BY THE RUSHING STEAM NOW DRAWS WATER THROUGH THE
SUPPLY PIPE WHERE IT COMES IN CONTACT -. WITH THE FLOW OF
THECOLD WATER CONDENSES THE STEAM CREATING A PARTIAL VACCUM AT
WHICH TIME THE RING VALVE CLOSES
ESCAPE OF WATER THROUGH SPILL HOLES DECREASES AS MIXTURE OF
STEAM AND WATER’ REACHES PROPER PROPORTIONS
HIGH VELOCITY PAST THE SPILL HOLES NOW TENDS TO DRAW IN AIR
WHICH WOULD BREAK THE FLOW BUT THIS IS PREVENTED BY THE CLOSING OF
THE OVERFLOW VALVE AND THE BUILT UP VELOCITY DRIVES THE WATER
COMPLETELY THROUGH AND INTO THE BOILER.