IMPROVEMENTS IN SPRING SAFETY VALVES FOR STEAM BOILERS
Year: 1871

page_text: LETTERS PATENT to William Crees, Taylor, of Liverpool, in the
County of Lancaster, Board of Trade Surveyor of Steam Ships,
for the Invention of "IMPROVEMENTS IN SPRING SAFETY VALVES FOR
STEAM BOILERS."
Sealed the 19th March 1872, and dated the 20th September 1871.
PROVISIONAL SPECIFICATION left by the said William Crees Taylor
at the Office of the Commissioners of Patents, with his Petition,
on the 20th September 1871.
I, WILLIAM CREES TAYLOR, of Liverpool, in the County of Lancaster,
Board of Trade Surveyor of Steam Ships, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN SPRING SAFETY VALVES FOR
STEAM BOILERS," to be as follows:-
First. As means for providing reliable and durable spring safety valves
suitable for steam boilers generally, but more particularly useful on or
in connection with marine steam boilers, I employ over the said valve,
usually in contact with the stem (the valve and seating being of any.

page_text: ordinary kind) a flat, a curved, or an elliptical spring, by preference
built up of several plates, the ends of which are jointed to links secured
at their other ends by pins to the boiler or a fixed foundation. A check
piece is provided to prevent the valve from rising too high. Means for
locking-up are also provided.
Second. As means for rendering the above flat, bent, or elliptical
springs, and steel springs of safety valves generally durable, I take
the said springs and coat them with copper by electro-deposition or
otherwise.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Crees Taylor in the Great Seal Patent
Office on the 20th March 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CREES TAYLOR, of Liverpool, in the County of Lancaster, Board of
Trade Surveyor of Steam Ships, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of September, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Crees Taylor, Her special
licence, that I, the said William Crees Taylor, my executors, adminis-
trators, and assigns, or such others as I, the said William Crees Taylor,
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 SPRING SAFETY VALVES FOR STEAM BOILERS,' upon the condition
(amongst others) that I, the said William Crees Taylor, my executors
or administrators, by an instrument in writing under my, or their, or
one of their hands and seals, 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 Seal
Patent Office within six calendar months next and immediately after
the date of the said Letters Patent.
"

page_text: NOW KNOW YE, that I, the said. William Crces Taylor, 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, reference being had to the accompanying
Sheet of Drawings and to the figures and letters marked thereon,
that is to say:-
First. As means for providing reliable and durable spring safety valves,
suitable for steam boilers generally, but more particularly useful on or
in connection with marine steam boilers, I employ over the said valve
usually in contact with the stem (the valve and seating being of any
ordinary kind) a flat, a curved, or an elliptical spring, by preference
built up of several plates, the ends of which are jointed to links secured
at their other ends by pins to the boiler or a fixed foundation. A.
check piece is provided to prevent the valve from rising too high.
Means for "locking-up" are also provided.
Second. As means for rendering the above flat, bent, or elliptical
springs, and steel springs of safety valves generally durable, I take
the said springs and coat them with copper by clectro-deposition or
otherwise.

page_text: tion of valve is well adapted for use on steam ships. It is here shown
provided with an expansion joint to prevent the steam from reaching
the spring when that part is not coated as specified under the second
part of my Invention, and with a lever so connected that a weight can
be applied and the force necessary to raise the spring, and consequently
the valve tested at any time. Like figures denote the same parts in
these five views.
1, steam pipe; 2, valve seating; 3, valve; 4, valve stem in two
lengths, connected by the adjusting nut 5; 6, curved spring passing
through the stem 4; 7, links jointed at 8, 8, and 9, 9; 10, guards;
11, expansion joint formed of rubber, best seen in Fig. 6, and secured
tightly by clips 12, delineated in Fig. 7; 14, passage for steam or fluid
blowing off; 15, enclosing case. When the expansion joint 11 is not
used the escape passage 14 may be connected to any part of 15. 16 is a
test lever coupled to the stem 4 and supported on the stud 17. As above
mentioned a weight can be placed on this lever, and the spring tested.
18 denotes a hand wheel, rod, and pinion, gearing with teeth on the
upper part of the valve, to allow of movement when desired of the
latter, and consequent tight fitting and even wearing of the faces of the
valve and scating.
The springs shown on the Drawings are of the form and construction
I prefer, but I would have it understood that flat, elliptical, or otherwise
curved springs, either made of one thickness of metal or of several
thicknesses, may be used, and they may either be plain or coated
with copper. When the said springs or springs for other safety valves
are to be coated with copper I effect the coating by electro-deposition
and burnishing, or I cause copper to adhere by rolling or drawing.
The links or radius rods jointed to the springs and to a stationary part,
as above described, are essential features of my Invention, and are of
great value, inasmuch as they begin to travel outwards at their upper
ends so soon as the valve leaves its seating, and by the said outwards
movement impart to the valve a greater lift than is due to the pressure
exerted on the under surface. That movement is unattainable by any
spring safety valve hitherto in use, and it is believed that it overcomes
the main existing objection, namely, the increasing resistance of the
spring with the rising of the valve. The said links or radius rods may
be so constructed that they can be lengthened or shortened at pleasure.

page_text: Having now described the nature of my said Invention, and par-
ticularized the same in such manner that others will be enabled to carry
my improvements into practice, I claim,-
First. The flat, curved, or elliptical springs jointed to links or radius
rods, substantially as described for the purpose set forth.
Second. Coating the above-claimed springs and steel springs of safety
valves generally with copper, for the purpose set forth.
In witness whereof, I, the said William Crees Taylor, have
hereunto set my hand and seal, this Eighteenth day of March in
the year of our Lord One thousand eight hundred and seventy-
two.
In the presence of
J. T. KING,
Patent Agent,
Liverpool.
WILLIAM CREES TAYLOR. (L.S.)