Improvements in or applicable to Safety Valves.
Year: 1898

page_text: Improvements in or applicable to Safety Valves.
I, WILLIAM LOCKHART BONE, of 16, Plymouth Grove, Manchester, in the County
of Lancaster, Mechanical Engineer, do hereby declare the nature of the said inven-
tion, to be as follows:--
There is a class of safety valves in which each valve of a pair is loaded by an
helical spring which abuts at its upper end against a plate screwed to uprights
from the casing of the valve, the lower end of which spring abuts against a
flange on the lower end of a cylinder, closed at that end and having a hollow to
come against the upper cone end of a spindle, which passes through a guide
above the valve, the cone lower end of which spindle resting in a hollow or cavity
on the upper side of the valve.
The cylinder upon which the spring rests has a centre spindle solid with its
closed end that passes upwards through the abutment plate at its upper end and
an armed screw nut screwed upon it to tighten and hold the spring while being
placed in position.
The helical springs used in the above described arrangement of valves cannot
always be made to act perfectly central, and as they may press more or less on
one side, they cause the spindle to move from its central position and to bind in
the guide more or less, and this interferes with the sensitiveness of the valve so
that it may stick more or less and not allow the valve to open and discharge at
the maximum load fixed upon and imparted by the spring.
My invention consists in arranging the spring which loads the valve as before
described but in leaving the lower end of the cylinder having the flange upon
which the lower end of the spring abuts open, so that the upper cone ended
spindle can come against a hollow or cone at the closed upper end of the cylinder
the spindle being also much longer, so that if the spring by any unequal action
tilts the cylinder to one side it does not move the spindle at the same time which
as thus arranged cannot bind upon the guide through which it passes and the valve
is kept perfectly free from any friction which might cause it to stick.
My invention also consists in combining the above described arrangement of
spring and abutment cylinder spindle, guide and valve, which spindles have sides
for a screw key, by which they may be rotated, and thus also the valve with
which the lower ends of the spindles are loosely connected by a pin. Two of
these valves are combined on the same casing and both can be lifted for testing
purposes by a shaft in suitable bearings on the casing having arms therefrom for
each valve spindle to como under a collar on each spindle.
Dated this Twenty-first day of July 1898.

page_text: I, WILLIAM LOCKHART 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:
There is a class of safety valves in which each valve of a pair is loaded by an
helical spring which abuts at its upper end against a plate screwed to uprights
from the casing. of the valve, the lower end of which spring abuts against a
flange on the lower end of a cylinder, closed at that end and having a hollow to
come against the upper cone end of a spindle, which passes through a guide
above the valve, the cone lower end of which spindle resting in a hollow or cavity
on the upper side of the valve.
The cylinder upon which the spring rests has a centre spindle solid with its
closed end that passes upwards through the abutment plate at its upper end and
an armed screw nut screwed upon it to tighten and hold the spring while being
placed in position.
The helical springs used in the above described arrangement of valves cannot
always be made to act perfectly central, and as they may press more or less on
one side, they cause the spindle to move from its central position and to bind-in
the guide more or less, and this interferes with the sensitiveness of the valve so
that it may stick more or less and not allow the valve to open and discharge at
the maximum load fixed upon and imparted by the spring.
My invention consists in arranging the spring which loads the valve as before
described but in leaving the lower end of the cylinder having the flange upon
which the lower end of the spring abuts, open, so that the upper cone ended
spindle can come against a hollow or cone at the closed upper end of the cylinder
the spindle being also much longer, so that if the spring by any unequal action
tilts the cylinder to one side it does not move the spindle at the same time which
as thus arranged cannot bind upon the guide through which it passes and the valve
is kept perfectly free from any friction which might cause it to stick.
My invention also consists in combining the above described arrangement of
spring and abutment cylinder spindle, guide and valve, which spindles have sides
for a screw key, by which they may be rotated, and thus also the valve with
which the lower ends of the spindles are loosely connected by a pin. Two of
these valves are combined on the same casing and both can be lifted for testing
purposes by a shaft in suitable bearings on the casing having arms therefrom for
each valve spindle to come under a collar on each spindle.
Fig. 1, is a sectional side elevation of a double safety valve the section being
taken through part of the casing, the valve, seating valve, guide for the lower
end of the valve spindle, the shaft for lifting the valves, the spring cylinder and
spring, the abutment cap and the screw upon the upper end of the spindle, of
one valve.
Fig. 2, is a sectional elevation of the double valve in a plane at a right angle
to that of Fig. 1, part of the casing being shown in section, but the exterior
diameters of the weighting springs are indicated in dotted line only.
a, is the casing, the lower end of which has a flange a¹, by which it is united
with a flange attached to the boiler. In this casing, the seating a², of the valve b,
is formed, and also the guide a³, or bearing for its stem b', to keep it in position
over its seating when lifting and lowering.
The upper side of the valve b, in its centre is cup shaped to form a bearing
for the rounded conical lower end of the valve spindle c, which passes through

page_text: a boss formed on the upper side of the valve concentric with the cup above men-
tioned.
There is a cross hole through the boss on the valve and through the lower end
of the spindle for a pin 62, to fit loosely, which pin when inserted is secured by a
split or other cottar passing through a hole in its end.
By this means, the valve b, and lower end of the spindle c, are connected together
so that when the spindle c, is lifted or turned, the valve b, will at the same time
be lifted or turned, the turning being effected by a screw key fitting flats formed
above a collar c¹, on the spindle, and it is lifted by a forked arm d', from a shaft d,
in suitable bearings on the plate e, secured to the casing a, by set screws e¹, and
in which plate, the guide e, is formed for the lower end of the spindle. The
shaft d, has or may have squares at each end so as to be oscillated by a suitable
key when the valves b, are to be lifted. The spindle c, passes up into a cylinder
or tube f, (hereinafter called the cylinder) and its upper cone end is above the
level of the abutment for the spring, and abuts against a cone cavity at the upper
inner end of the cylinder f, which at that end is closed and solid with a shaft f',
or axis passing freely through an inverted cup 9, having two ears connected by
screw nuts to the upper ends of two rods h, the lower ends of which are screwed
into the casing a, of the valve.
The shaft or axis fl, forming the continuation of the cylinder f, is screwed
for a screw nut f, having arms by which it can be rotated, the screw being used
only to compress and hold the spring in tension when being inserted in position,
but the screw nut f, is unscrewed to allow the shaft or axis f', to be at perfect
liberty to move up and down freely when the valve is in working order.
The underside of the inverted cup g, also forms the abutment against which the
upper end of the helical spring comes, the lower end of which rests upon a
flange i, round the lower end of the cylinder f, and thus the reaction of the
compressed spring acts upon the upper end of the long spindle c, to hold down
the valve b, when the pressure of steam or fluid is not in excess of that fixed upon.
To keep the cylinder f, concentric with the spindle c, should the spring i, tend
to lift it to one side, there is a collar c, on the spindle c, near the lower end of the
cylinder f, that fits its bore freely.
This collar, does not cause any friction tending to affect the free lifting
of the valve b, by the action of the steam as the spindle c, its collar c, and the
cylinder f, all move up and down together, and as the spindle when working does
not slide in and out of the cylinder f, there can be no friction obstructing the
outward pressure of the steam or fluid under pressure acting to lift the valve.
The upper ends of the two rods h, in the double safety valve are connected and
steadied by a link h¹, between each pair of upright rods h.
The outlet for steam or fluid is from any convenient part of the casing from
the chamber a, above the valves b.
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. The combination of the upper end of a weighting spindle with the interior
of the upper end of a cylinder having a spring round it, the upper end of which
acts against an abutment, and the lower end against a flange on the lower end
of the cylinder, substantially as and for the purpose herein before described.
2. The combination and arrangement of a safety valve substantially as and for
the purpose herein before described and illustrated by the drawings.
3. The combination of two safety valves with the same casing substantially as
hereinbefore described and illustrated by the drawings.
Dated this Twenty-eighth day of March 1899.