AN IMPROVEMENT IN THE APPLICATION OF SAFETY VALVES TO Sun RATED BOILE
Year: 1872

page_text: LETTERS PATENT to John Randolph Cazier, of North East, Erie.
County, State of Pennsylvania, United States of America, for the
Invention of "AN IMPROVEMENT IN THE APPLICATION OF SAFETY VALVES TO
Sun RATED"
County, State of Pennsylvania, United States of America, for the
Invention of "AN IMPROVEMENT IN THE APPLICATION OF SAFETY VALVES TO
STEAM BOILERS."
Sealed the 16th August 1872, and dated the 27th June 1872.
COMPLETE SPECIFICATION filed by the said John Randolph Cazier
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 27th June 1872, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
RANDOLPH CAZIER, of North East, Erie County, State of Pennsylvania,
United States of America, send greeting.
WHEREAS I am in possession of an Invention for "AN IMPROVEMENT
IN THE APPLICATION OF SAFETY VALVES TO STEAM BOILERS," and have petitioned
Her Majesty to grant unto me, my executors, administrators, and
assigns, Her Royal Letters Patent for the same, and have made solemn
Declaration that I am the first and true Inventor thereof :
NOW KNOW YE, that I, the said John Randolph Cazier, do hereby
declare that the following Complete Specification, under my hand and

page_text: seal, fully describes and ascertains the nature of the said Invention, and
in what manner the same is to be performed, in and by the following
statement, reference being had to the accompanying Drawing, forming
part of this Specification:-
The nature of my Invention consists in the introduction between the
boiler or dome and the valve of a tube turning downward in a part of its
length so that water condensed from steam generated in the boiler shall
apply to the valve, the water thus condensed being interposed between
the valve and the steam. The object of this is to keep the safety valve
moist and cool, and thus to prevent it from adhering to the valve seat.
if
This depends upon the fact that water conducts heat but little, any,
so that the lower portion of the water in the tube may be comparatively
cool while the upper portion is at the temperature of the steam from
which it was condensed.
In order to enable others skilled in the art to which my Invention
appertains to make and use the same, I will now proceed to describe its
construction and operation, referring to the annexed Drawing, in which
Figure 1 is a side view of both boiler and safety valve, the valve being
above the boiler; Figure 2 is an end view of the boiler with the valve
to one side and below it; Figure 3 is another view of the tube and valve
on a somewhat larger scale; and Figures 4, 5, and 6 show certain modi-
fications of the same applied to the top of the dome.
A represents a cylindrical boiler; B, the dome; and C, the tube turning
downward and bearing the valve seat at its lower extremity. The valve
hinges upon the graduating lever at D, the fulcrum of which is at E, and
the poise at F. The valve may be in any form suitable for the purpose.
In its practical working the water in the tube must be discharged before
the steam can issue, and some kind of a conductor will be required to
receive and conduct it away.
For a cheap fixture a wooden trough and canvass covering will probably
be sufficient, but a metallic cap and pipe can be supplied if desired.
The valve tube may be made longer, and the valve placed to one side
and below the boiler, as shown in Fig. 2, in which the boiler is shown
endwise. In Figure 3 the lower part of the tube has a bend upward, so
that the valve G may open upward in the usual way. It is also supplied
with a cap. and an exhaust pipe. The open end of the exhaust pipe
where it enters the cap is seen at H.
When the tube turns up near the

page_text: bottom, as in Fig. 3, a stop-cock to discharge water should be supplied,
as seen at I. A stop-cock or valve is also desirable, as seen at J, in
Fig. 2, so that the flow of steam may be cut off when it is desired to
detach the pipe below the elbow. In absence of the dome the pipe must
be bent over and extended down into the boiler to take its place.
In Figures 4, 5, and 6 I have shown the tube C applied to the top of
the dome, and it may be arranged so that the valve will open either
upward or downward, as desired. To open upward a casting K may be
used, as shown in Fig. 4, screwed on to the end of the bent pipe C, with
the valve on its upper side, and the stop-cock I at its outer end. A still
simpler form would be, as shown in Figure 6, to have a short tube C in
the top of the dome with a casting K screwed on top of the same, and
said casting have an interior curved or bent passage forming a continua-
tion of the tube, and with the valve opening upward. In these cases
space is economized and the same results obtained, except that the water
around the valve will not be as cool as in the cases where the pipe is
extended down along the side of the boiler.
Having thus fully described my Invention, what I claim as new and
desire to secure by Letters Patent is,-
1st. The arrangement of the boiler with the tube C between it and the
safety valve, substantially as and for the purposes herein set forth.
2nd. In combination with the tube C arranged between the boiler and
the safety valve the stop-cock J, as and for the purposes set forth.
In testimony that I claim the foregoing I have hereunto set my
hand and seal, this Fifth day of May, in the year of our Lord One
thousand eight hundred and seventy-two, at Washington, in the
District of Columbia, United States of America.
JOHN RANDOLPH CAZIER. (L.S.)
Witnesses,
CHARLES LEOPOLD EVERT.
ARTHUR NELSON MARR.