IMPROVEMENTS IN SPRING LOADED SAFETY VALVES.
Year: 1877

page_text: LETTERS PATENT to Albert Edward Seaton, of the Town and County of
Kingston-upon-Hull, Engineer, and John George Cameron, of the same Place,
Engineer, for the Invention of "IMPROVEMENTS IN SPRING LOADED SAFETY
VALVES.
33
Sealed the 15th September 1877, and dated the 17th March 1877.
PROVISIONAL SPECIFICATION left by the said Albert Edward Seaton and
John George Cameron at the Office of the Commissioners of Patents on the
17th March 1877.
.
ALBERT EDWARD SEATON, of the Town and County of the Town of Kingston-
upon-Hull, Engineer, and JOHN GEORGE CAMERON, of the same Place, Engineer.
IMPROVEMENTS IN SPRING LOADED SAFETY VALVES."
The object of our Invention is to provide a simple, effective, and reliable safety
valve, which from its construction and form shall be free from the tendency to stick
fast or to sluggishness of motion in opening and shutting, and which shall be also casy
of access for examination and repair.
Our Invention consists,―
Firstly. In the form and construction of the valve itself, its under side or part
exposed to direct steam pressure and impact, being concave and in the form of a
cone, paraboloid, or other surface produced by the revolution of a curve about its
axis, and the mitre or bearing face of the valve is on this concave surface, and has a
corresponding convex seat on the outer edge of the usual bush, circle, or orifice on
which the valve sits, thereby causing the steam to be directed from the valve
through the issuing orifice, and in this manner we avail ourselves of the dynamic
effect of the issuing steam to quicken the movement of the valve.
Secondly. In the form of the inner surface of the bush, circle, or orifice on which
the valve sits, which may be cylindrical, conical, or formed by the revolutions of a
curve about an axis at an angle with its own axis, so as to give a trumpet mouth to
further deflect the steam,

page_text: Thirdly. In an arrangement of guiding ring or bush loosely embracing the outer
circumference of the valve, and so formed and arranged that the flow of steam from
the issuing orifice shall be utilized to induce a current of air to flow from the spring
chamber, and so ventilate it, and thereby keep the springs cool, and preserve them
from corrosive and other deteriorating action.
Fourthly. In the arrangement of the said guide ring, to the exact configuration
of which we do not confine ourselves, whereby the said induced current may be
further utilized to cause a partial vacuum above the valve, and of which we avail
ourselves to cause it to lift the more readily, and the valves and embracing ring to
be so set that on a given lift being attained the steam shall check and stop this
current, and so destroy the vacuum, and allow the valve to close immediately.
Fifthly. In an arrangement whereby the spring is contained in a casing which
may be filled with tallow, oil, glycerine, or other suitable liquid which will protect
it from corrosion, or by enclosing the said spring in a flexible waterproof envelope
or case, which will allow it free action, and protect it from vapour, water, or other
injurious substances.
Sixthly. In an arrangement for relieving the spring from compression when it
may be found desirable to do so without interfering with it or its fixings, connec-
tions, etc. This we effect in the following manner, that is to say:-We make the
spring chamber or holder a separate casting, and so formed and made that it fits
into the valve box, and is guided and steadied therein by wings cast with it, and a
flange formed on its outside sits on a corresponding flange on top of the valve
box; the said spring box or chamber is thereby secured to the said valve box by
studs or bolts, the nuts of which are made with a toothed collar. A circular rack is.
fitted so as to connect the said toothed nuts, so that when one of the said nuts is
moved the whole of them move together.
Seventhly. In an arrangeinent whereby the valve may be lifted from its seat at
any time. This we effect in the following manner, that is to say :-We fit a'loose
cross head to the usual hollow cross handle, and connect the said cross head to a.
pair of levers, one on each side of the spring chamber, by side rods; the said levers
are keyed to a weigh shaft carried in a bracket secured to the valve box, which
weigh shaft can be operated on by a relief lever or other suitable gear.
Eighthly. We do not confine ourselves to the use of any particular form of spring,
as either the usual spiral, volute, or other circular form is equally applicable to each
and all of the above mentioned arrangements, and we claim to use any one or more
of the above arrangements either separately or together.
Ninthly. We propose to make the embracing ring herein-before alluded to hollow,
so as to admit water through small holes or slits close to the issuing orifice of the
valve, for the purpose of condensing the steam wholly or partially, and thus mako
the valve wholly or partially noiseless, and we propose applying it for heating water.
in tanks for any purpose, or for condensing fresh water, in which latter case we use
fresh water to condense the steam.
+
SPECIFICATION in pursuance of the conditions of the Letters Patent, and of
an Order of the Lord Chancellor, filed by the said Albert Edward Seaton and
John Georgo Cameron in the Great Seal Patent Office on the 6th October
1877.
ALBERT EDWARD SEATON, of the Town and County of the Town of Kingston-upon-
Hull, Engineer, and JOHN GEORGE CAMERON, of the same Place, Engineer.
"IMPROVEMENTS IN SPRING LOADED SAFETY VALVES."
The object of our Invention is to provide a simple, effective, and reliable safety
valve, which from its construction and form shall be free from any tendency to stick
fast, or to be sluggish of motion in opening and shutting, and which shall be also,
easy of access for the purposes of examination and repair.

page_text: In order that the nature of this our Invention, and the manner in which the same
is effected may be particularly described and ascertained, this Specification is accom-
panied by a Sheet of Drawings having figures and letters of reference marked
thereupon, the like lotter being used to denote a similar or corresponding part in
each Figure.
I. Our Invention consists,-
Firstly (see Figure I. in the Drawings). In the form and construction of the valve
itself, its under side or the part a thereof exposed to direct steam pressure and
impact, which is made concave, and in the form of a cone, paraboloid, or other
surface produced by the revolution of a curve about its axis, and the mitre or
bearing face b of the valve is on this concave surface, and has a corresponding
convex seat on the outer edge of the usual bush, liner, or orifice on which the valve
sits, thereby causing the steam to be diverted from the valve through the issuing
orifice, and in this manner wo avail ourselves of the dynamic effect of the issuing
steam to quicken the movement of the valve. Different forms that we propose to
use are shewn in Figures 2, 3, 4, and 5 in the Drawings.
II. Secondly. In the form of the inner surface of the bush, liner, or orifice on
which the valve sits, which may be cylindrical, conical, or formed by the revolution
of a curve about an axis at an angle with its own axis, so as to give a trumpet
mouth to further deflect the steam. Figures 6, 7, and 8 shew some of the forms of
seat we propose to use with our valves.
III. Thirdly. In an arrangement of guiding ring or bush (c, Figure I.) loosely
embracing the outer circumference of the valve, and so formed and arranged that
the flow of steam from the issuing orifice shall be utilized to induce a current of air
to flow from the spring chamber, and so ventilate it, and thereby keep the springs
cool, and preserve them from corrosive and other deteriorating action.
IV. Fourthly. In the arrangement of the said guide ring (to the exact configura-
tion of which we do not confine ourselves), whereby the said induced current may
be further utilized to cause a partial vacuum above the valve, and of which we
avail ourselves to cause it to lift the more readily, and the valve and the embracing
ring to be so set that on a given lift being attained the steam shall check and
stop this current, and so destroy the vacuum, and allow the valves to close
immediately.
V. Fifthly. In an arrangement (Figure 9) whereby the spring is contained in a
casing, which may be filled with tallow, oil, glycerine, or other suitable liquid which
will protect it from corrosion, or by enclosing the said spring in a flexible water-
proof envelope or case which will allow it free action, and protect it from vapour,
water, or other injurious substances.
VI. Sixthly. In an arrangement for relieving the spring from compression when
it may be found desirable to do so, without interfering with it or its fixings, con-
nections, etc. This we effect in the following manner, that is to say :-We make,
see Figure I., the spring chamber or holder a separate casting, and so formed and
made that it fits into the valve box, and is guidied and steadied therein by wings
cast with it, and a flange formed on its outside sits on a corresponding flange on top
of the valve box; the said spring box or chamber is thereby secured to the said
valve box by studs or bolts, the nuts of which are made with a toothed collar. A
circular rack is fitted so as to connect the said toothed nuts, so that when one of the
said nuts is moved the whole of them move together.
VII. Seventhly. In an arrangement whereby the valve may be lifted from its
seat at any time. This we effect in the following manner, that is to say:-We fit a
loose cross head to the usual hollow cross handle, and connect the said cross head to
a pair of levers, one on each side of the spring chamber, by side rods; the said
levers are keyed to a weigh shaft carried on a bracket secured to the valve box,
which weigh shaft can be operated on by a relief lever or other suitable gear.
We do not confine ourselves to the use of any particular form of spring, as either
the usual spiral, volute, or other circular form is equally applicable to each and all
of the herein-above mentioned arrangements.

page_text: What we claim and desire to secure by the herein-before in part recited Letters
Patent is,―
The arrangement, as described in sections I. to VII. in this Specification, and
illustrated in part in the accompanying Drawings.
And we claim also the use of any one or more of the above arrangements, either
separately or together.
In witness whereof, I, the said Albert Edward Seaton, on behalf of myself and
the said John George Cameron, have hereunto set my hand and seal, this
Seventeenth day of September, in the year of our Lord One thousand
eight hundred and seventy-seven.
ALBERT EDWARD SEATON.
(L.B.).