IMPROVEMENTS IN VALVES FOR REGULATING THE PRESSURE OF STEAM, AIR, WATER, OR OTHER FLUID."
Year: 1874

page_text: LETTERS PATENT to William Lockwood, of Sheffield, in the County of
York, Engineer, for the Invention of "IMPROVEMENTS IN VALVES FOR
REGULATING THE PRESSURE OF STEAM, AIR, WATER, OR OTHER FLUID."
PROVISIONAL SPECIFICATION left by the said William Lockwood
at the Office of the Commissioners of Patents, with his Petition,
on the 21st March 1874.
I, WILLIAM LOCKWOOD, of Sheffield, in the County of York, Engineer,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN VALVES FOR REGULATING THE PRESSURE OF STEAM, AIR, WATER, OR OTHER
FLUID," to be as follows:-
The object of this Invention is the better regulation of the pressure,
whether of steam, air, water, or other fluid, and the novelty of the
improvements consists in arranging within a chest or casing two com-
pound balance safety valves, also in coupling them together by one
lever, and in balancing them by one weight in such a manner as to

page_text: enable them to act together to accomplish the desired purpose of
regulating pressure.
"
The chest or casing is made of a suitable size and shape, and is fitted
and secured to the boiler, cylinder, pipe, or tube in the usual manner.
At an upper and a lower part (or at other suitable parts) the casing is
provided with two valve seats in each of which one of the valves rests.
Each valve is formed with an inwardly projecting "stoke or rod (or
its equivalent), which is provided with a steel "centre." These
"centres" bear one against the upper and one against the lower side of
a lever at different parts so as to support it, and this lever is provided
with a sliding balance weight, which can be adjusted and set to the
weight or pressure required, and held in such position by a set screw or
otherwise; thus, the one weight balances and equally controls both
valves in every way. The upper part of the casing is made with a hole
provided with a bolted flanged cover, through which the lever and weight
are introduced. The action is that the internal pressure of the steam,
air, water, or other fluid forces both valves outwards, and the one weight
by means of its lever brings them both back when the said internal
pressure is sufficiently relieved.
The Invention is applicable to various kinds or descriptions of valves,
such as to safety and feed box valves of locomotive, marine, and
stationary boilers, and to regulation, air, and pressure valves for
governing blast and other engines, and also to
escape and pressure
valves for steam, air, and water cylinders, overflow pipes, and such like
uses.
:
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Lockwood in the Great Seal Patent
Office on the 21st September 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
LOCKWOOD, of Sheffield, in the County of York, Engineer, send greeting. 3
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent bearing date the Twenty-first day of March, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-seventh
year of Her reign, did, for Herself, Her heirs and successors, give and

page_text: grant unto me, the said William Lockwood, Her special licence that
I, the said William Lockwood, my executors, administrators, and
assigns, or such others as I, the said William Lockwood, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the, term.
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
VALVES FOR REGULATING THE PRESSURE OF STEAM, AIR, WATER, OR OTHER FLUID,"
upon the condition (amongst others) that I, the said William Lockwood,
my executors or administrators, by an instrument in writing under my,
or their, or one of their hands and scals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the same
was to be performed, and cause the same to be filed in the Great Scal
Patent Office within six calendar months next and immediately after
the date of the said Letters Patent..
NOW KNOW YE, that I, the said William Lockwood, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed; to be particularly described and ascertained in and
by the following statement in writing, and on reference being had to the
accompanying Sheet of Drawings, that is to say:-
The novelty of this Invention, which relates to improvements. in
valves for regulating the pressure of steam, air, water, or other fluid,
consists in arranging within a chest or casing two compound balance
safety valves, and in coupling them together by one lever and balancing
them by one weight in such a manner as to enable them to act
together, the object of the Invention being the better regulation of the
said pressure.
The Invention is illustrated in one modification in Figures 1 and 2 of
the accompanying Drawings.
The chest or casing 1 is made of any suitable size and shape, and is
fitted and secured to the boiler cylinder pipe or tube in the usual way,
and is provided with two valve seats 2, 3, in which two valves 4, 5,
respectively rest. Each of these valves 4 and 5 is formed with an
inwardly projecting "stoke" or rod 6, 7, (or its equivalent) having
bifurcated terminations 8, 9, (scc Figure 2) respectively provided with
stecl centres 10, 11. The centre 11 bears against the upper side of a

page_text: lever 12, against the lower of which bears the centre 10, the lever
passing through the bifurcated terminations 8 and 9. These centres
bear against the lever 12 at different parts (see Figure 1) so as to support;
it. The lever 12 is provided with a sliding balance weight 13 (or balanco.
spring), which can be adjusted thereon and set to the weight or pressure
required, and held in such position by a set screw 14 or otherwise; thus
the one weight (13) balances and equally controls both of the valves 4, 5.
The upper part of the casing 1 is made with a hole 15 (provided with a
flanged cover 16), through which the lever 12 and weight 13 are
introduced. The action of this modification is that the pressure of the
steam, air, water, or other fluid within the chest or casing 1 forces, both
valves 4 and 5 outwards in the direction of the arrows, and the one
weight 13 by means of its lever 12 brings them both back when the said
pressure is sufficiently relieved.
In the modification illustrated in Figures 3, 4, and 5, the valve 5 is
partly balanced by the valve 4 and partly by the weight 13. When the
pressure upon the valve 5 (the farthest removed from the adjustable
centre 17, upon which the lever 12 rocks) is sufficient to overcome that
upon the valve 4 (the one nearest the centre 17) plus the balancing of
the weight 13 (or spring) it lifts and at the same time lifts the valve 4
(both acting in the same direction, see the arrows), and enables the
steam to blow off at both valves. In this modification the chest or
casing 1 is made in two parts, which are bolted together, as shown in
Figure 4. The lower part receives the seating 3 of the valve 5, and is
provided with a bridge 18 provided with steam passages 19 (see Figure 5)
and carrying the seating 2 of the valve 4, the valve chamber 20 being
provided with a flanged cover 21. The lever 12 is adjusted by screw
nuts 22, and receives the pressure of the valves 4, 5, through their pro-
jecting rounded extrémities 10, 11.
The Invention is applicable to various kinds or descriptions of valves,
such as to safety and feed-box valves of locomotive, marine, and
stationary boilers, and to regulation, air, and pressure valves for
governing blast and other furnaces, and also to escape and pressure
valves for steam, air, and water cylinders, overflow pipes, and such like
uses.
Having now particularly described and ascertained the nature and
object of my said Invention, together with the manner in which the.
same is to be or may be performed or carried into practical effect, I.

page_text: would remark in conclusion that I claim as my Invention the above
specified improvements in the construction and arrangement of valves,
substantially as herein described and as illustrated on the accompanying
Sheet of Drawings, and the application and employment of the same for
the purposes herein set forth.
In witness whereof, I, the said William Lockwood, have hereunto
set my hand and seal, this, Nineteenth day of September, in the
year of our Lord One thousand eight hundred and seventy-four.