Improvements in or applicable to Safety Valves.
Year: 1899

page_text: Date of Application, 10th July, 1899
Complete Specification Left, 5th Apr., 1900-Accepted, 12th May, 1900
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Safety Valves.
I, WILLIAM LOCKILART BONE. of 16, Plymouth Grove, Manchester, in the
County of Lancaster, Mechanical Engineer, do hereby declare the nature of the
said invention to be as follows:-
My invention relates to improvements upon the invention described in the
Complete Specification of an Application for Letters Patent No. 16038 of 1898.
At the high pressures for which safety valves are now required and used, and
with the increased temperature to which the valves are consequently subjected,
the valves in lifting and lowering, require to be kept as true centrally as possible,
as in case of only a slight departure from truth, the valve begins to discharge
steam before it has attained the maximum fixed upon, and more on one side than
another owing to this want of truth, and consequently the hot high pressure
steam produces an uneven eroding effect on the facings and seatings of the valve
as steam may escape from one side or more on one side than the other, which
eroding or uneven wear prevents the valve from closing tightly when near its
maximum load.
According to the invention described in my said Complete Specifica-
tion, the lower end of the valve spindle (c) rests in a cavity in the upper side of
the valve (b) and then passes upwards through a guiding tube (3)
secured to the casing of the valve and the upper rounded end of the spindle (c)
passes into a cavity at the upper end of a cylinder (f) at a point above the level
of the abutment of the loading spring (2) at its upper end, the lower end of the
loading spring resting upon a flange (1) at the lower end of the cylinder (f).
The letters of reference given and hereinafter used, are those used on the parts,
referred to in my said Complete Specification. According to my present inven-
tion, the said guiding tube (e) is made to extend upwards and within the cylin-
der (f) to near the upper end of the spindle (c) at which end there is or may be a
bush screwed into it, the interior bore of which, fits the spindle (c) which can
pass freely through it-this guide at its upper end is by preference above the
level of the abutment of the loading spring at its upper end.
The lower end of the interior of the cylinder (f) for the loading spring (1)
nearly touches the exterior of the guiding tube, or there is an enlargement on the
exterior of the lower part of the guiding tube which nearly touches the interior
of the lower end of the cylinder (f) for the loading spring. Thus arranged the
loading spring (2) can give no lateral tilting action to the valve spindle, and the
up and down movements of the spindle and valve when opening or closing are
free and are kept perfectly central at all times.
There is a slot in the side of the lower part of the guiding tube for a finger or
arm () on the lifting shaft (7) to pass through to come under a collar (c¹) on the
valve spindle (o):
There are or may be holes in the collar part of the valve spindle opposite the
slot in the guiding tube so that the spindle may be rotated by a pin or rod, the
end of which can be passed through the slot and placed in the holes in the spindle.

page_text: The other parts of the improved valve for both single and double safoty valves
are or may be as described in my said Complete Specification.
The details above described may be varied.
"
+
I, WILLIAM LOCKILART BONE, of 16, Plymouth Grove, Manchester, in the
County of Lancaster, Mechanical Engineer; do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
My invention relates to improvements upon the invention, described in the
Complete Specification of an Application for Letters Patent No. 16038 of 1898,
and will be illustrated by the accompanying drawing which is a sectional eleva,
tion, and shows the parts of my invention described in my said Complete Speci-
fication and hereinafter referred to, and also my present improvements thereon!
At the high pressures for which safety valves are now required and, used, and
with the increased temperature to which the valves are consequently subjected,
the valves in lifting and lowering, require to be kept as true centrally as possible,
as in case of only a slight departure from truth, the valve begins to discharge
steam before it has attained the maximum fixed upon, and more on one side than
another owing to this want of truth, and consequently the hot high pressure
steam produces an uneven eroding effect on the facings and seatings of the valve
as steam may escape from one side or more on one side than the other, which
eroding or uneven wear prevents the valve from closing, tightly when near its
maximum load.
According to the invention described in my said Complete Specifica-
tion, the lower end of the valve spindle (c) rests in a cavity in the upper side of
the valve (6) and then passes upwards through a guiding tube (e) of short length,
secured to the casing of the valve, and the upper rounded end of the spindle (c)
passes into a cavity at the upper end of a cylinder (f) at a point above the level
of the abutment of the 'loading spring () at its upper end, the lower end of the
loading spring resting upon a flange () at the lower end of the cylinder (f)..
The letters of reference given and hereinafter used, are those used on the parts
referred to in my said Complete Specification. According to my present inven-
tion, the said guiding tube (2) (which is only of short length as shown in my
aforesaid specification) is made to extend upwards and within the cylinder (f),
(which is enlarged in diameter accordingly) as shown, to near the upper end
of the spindle (e) at which end there is or may be a bush (es) screwed into it, the
interior bore of which, fits the spindle (c) which can pass freely through it-this
guide at its upper end is by preference above the level of the abutment of the
loading spring (2) at its upper end as shown. The lower end of the interior of the
cylinder (f) for the loading spring (2) nearly touches the exterior of the guiding
tube (e) or there is an enlargement on the exterior of the lower part of the
guiding tube at. (e) which nearly touches the interior of the lower end of the
cylinder (f) for the loading spring.
A "1.5"
-
Thus arranged the loading spring (2) can give no lateral tilting action to the
valve spindle, and the up and down movements of the spindle and valve when
opening or closing are free 'and are kept perfectly central at all times, tệ
Tin

page_text: There is a slot in the side of the lower part of the guiding tube for a finger or
arm (1) on the lifting shaft (₫) to pass through to come under a collar (¹) on the
valve spindle (c) or there are two arms (d) one on each side of the spindle.
There are or may be slots in the lengthway of the guiding tube (3) and also
in the weighting cylinder (f) to lighten them and allow steam or Huid to pass
freely.
There are or may be holes (c) in the collar part of the valve spindle opposite
the slot in the guiding tube so that the spindle may be rotated by a pin or rod,
the end of which can be passed through the slot and placed in the holes in the
spindle.
The other parts of the improved valve for both single and double safety valves
are or may be as described in my said Complete Specification.
The details above described may be varied.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
-
1. Guiding the valve spindle, which rests on the valve at its lower end and in
the hollow of the cylindrical tube for weighting the valve at its upper end by a
long tube secured to the base frame of the valve and extending as high as pos-
sible within the weighting cylinder substantially as and for the purpose herein-
before described and illustrated by the drawing.
2. In safety valves, the combination and arrangement of the spindle (c) guid-
ing tube (e) and weighting cylinder and weighting spring substantially as and
for the purpose herein before described and illustrated by the drawing.
3. The combination and arrangement of safety valve mechanism substantially
as herein before described and illustrated by the drawing.
Dated this Fourth day of April. 1900.
PETER J. LIVSEY,
Agent.