IMPROVEMENTS IN SPRING SAFETY VALVES
Year: 1872

page_text: LETTERS PATENT to Thomas Turton, of Liverpool, in the County
of Lancaster, Steel and Iron Manufacturer, for the Invention of
"IMPROVEMENTS IN SPRING SAFETY VALVES."
Sealed the 5th November 1872, and dated the 6th May 1872.
PROVISIONAL SPECIFICATION left by the said Thomas Turton at the
Office of the Commissioners of Patents, with his Petition, on the
6th May 1872.
I, THOMAS TURTON, of Liverpool, in the County of Lancaster, Steel
and Iron Manufacturer, do hereby declare the nature of the said In-
vention for "IMPROVEMENTS IN SPRING SAFETY VALVES," to be as follows :—
:
i
My Invention consists essentially in constructing spring safety valves
for steam boilers and other vessels with parts which I term compensating
struts. The object of these so-called compensating struts is to ensure
that the springs shall practically offer the same resistance to the rising
of a valve at every portion of its lift, from the time it leaves its seating
until it reaches its limit of travel, which latter I prefer should be in
accordance with the regulations of the Board of Trade.

page_text: The springs or spring employed under my Invention may be so
applied as to offer resistance when in tension or compression.
Several modifications illustrative of the manner of combining the
springs with the compensating struts and other parts are delineated on
the accompanying Sheet of Drawings.
Fig. 1 is a view in side clevation and section, and Fig. 2, a plan of
so much of a safety valve as is necessary to clearly show the arrangement
of parts of a valve with two springs and two pairs of struts. For con-
venience one spring is drawn arranged so as to offer tension resistance,
and the other compression resistance. 1 denotes the valve; 2, spindle
with fixed collar; 3, 4, stationary guide bar; 5, 5', compensating struts,
bearing at their inner ends against the collar 3 and guide bar 4, and at
their outer ends against the rocking picces 6. The backs of the rocking
pieces are formed with blunt edges, which bear against the transverse
bars 7, to which the springs 8, 8', are connected through adjustable
rods 9. The metal spring 8 here offers tension resistance, whilst the
disc rubber spring offers compression resistance.
In practice I prefer to employ two springs of the same kind. The
rods 9 are fitted with nuts or their equivalents to allow of adjustment of
the springs. During the rising of the valve 1 it will be evident that the
inner ends of the compensating struts 5 are caused to travel towards
the inner ends of the struts 5', and that lateral motion is at the same
time imparted to the transverse bars, such motion being resisted by the
springs 8, 8'.
Fig. 3 is a view in side elevation and section of a modification with
two struts and two rubber springs offering compression resistance.
2, valve spindle; 3, collar; 4, standards and guide bar; 5, compensating
struts bearing on 3 and against the rubber disc springs 8.
Fig. 4 is a side elevation showing a curved metal spring 8, bearing
on the collar 3 of the valve spindle 2; 4, guide bar; 5, compensating
struts.
Fig. 5 has the same parts as Fig. 4, marked with the same figures, but
the spring and struts are inverted.
Fig. 6 shows a modification with two metal springs 8 secured to a
stationary frame at their lower ends, and adapted to receive the thrust of

page_text: the struts 5 at their upper ends, the struts being arranged to bear on
a collar 3 on the valve spindle 2; 4, guide bar.
Fig. 7 has two metal springs 8 hooked under pins 10, and over pins
on the rod 9, the struts being fitted to bear on the collar 3 of the
spindle 2, and against the centre of the springs 8.
Fig. 8 has a curved metal spring marked 8, with struts 5 bearing
against its free ends. The inner ends of the struts bear on the collár 3
of the valve spindle 2.
Fig. 9 has two coiled springs 8 fitted with levers 11, which receive
the thrust of the struts 5.
Although I have shown all the bearing ends of the struts of a blunt
knife-like edge on the Drawings, I would have it understood that they
may be connected to the springs and intermediate parts, and also to the
valve spindle by pin or other joints.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Turton in the Great Seal Patent Offico
on the 6th November 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
TURTON, of Liverpool, in the County of Lancaster, Iron and Steel
Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of May, in the year of our
Lord One thousand eight hundred and seventy-two, in the thirty-fifth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Thomas Turton, Her special licence that I,
the said Thomas Turton, my executors, administrators, and assigns,
or such others as I, the said Thomas Turton, my executors, adminis.
trators, 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 thọ
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN SPRING SAFETY VALVES,"
upon the condition (amongst others) that I, the said Thomas Turton,
i

page_text: Fig. 8 has a curved metal spring marked 8, with struts 5 bearing
against its free ends. The inner ends of the struts bear on the collar 3
of the valve spindle 2.
Fig. 9 has two coiled springs 8 fitted with levers 11 which receive the
thrust of the struts 5.
Although I have shown all the bearing ends of the struts of a blunt
knife-like edge on the Drawings, I would have it understood that they
may be connected to the springs and intermediate parts, and also to the
valve spindle by pin or other joints.
In practice I prefer that the springs and compensating struts should 1
be so arranged and adjusted with relation to each other, and to the valve
'spindle, that the same resistance is offered to a valve both when closed
and at every part of its lift until it reaches "full open;" but it will be
evident that the said struts may be so arranged and adjusted that the
springs offer less and less resistance the higher the valve rises from its 1
seating.
Having now described the nature of my said Invention, and par-
ticularized the same by various modifications, in such manner that others
will be enabled to carry my improvements into effect, I claim, con-
structing spring safety valves for steam boilers and other vessels, with
the parts herein described as compensating struts, operating substantially
as set forth.
In witness whereof, I, the said Thomas Turton, have hereunto set
my hand and seal, the Fourth day of November, in the year of
E
In the presence of
JAMES JOHNSON,
Clerk to J. T. King,
Liverpool.
THOMAS TURTON. (L.S.)