Improvements in Safety Valves for Kitchen Range and other Hot Water Boilers.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Safety Valves for Kitchen Range and other
Hot Water Boilers.
I, JOHN WATKINS BARBER, of 40 Fitzwilliam Road, Clapham in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention has for its object the more effectual protection of domestic water
boilers such as kitchen range boilers and the like from liability to explosion
consequent upon the blocking of circulating pipes through incrustation, frost, or
otherwise, and to enable the fires of such boilers to be kept alight at all times
without risk to life or property.
In safety valves as ordinarily constructed for boilers such as referred to the
working parts are not readily accessible for inspection and cleaning; dirt is liable
to collect and to become gradually baked into scale, thus in a short time fastening
the valve to its seat, in the event of slight leakage of the valve water is liable to
collect around and on top of the valve, and during a cold night to freeze and
prevent proper action of the valve; it cannot be readily ascertained whether the
valve is free to act, and the opening leading from the boiler is so small that the
valve when in its place almost fills the aperture consequently the valve is liable to
become fixed by being furred up.
Now my invention is designed to obviate these evils and to produce a strong
durable and reliable safety valve, for which purpose my improved construction is
as follows:-
A tubular part I will call the union is formed with a flange and with a screw-
thread around its lower part provided with a nut for connection with the boiler;
on the top of the union is a raised annular valve seat upon which the valve normally
rests. The valve is circular in form with wings, and a vertical spindle or stem
which may be in one piece with the valve or the valve and may be formed with a
lug having in it a slot through which there is passed a pin with clearance above
and below it in the slot the ends of this pin being secured in the valve spindle at
the respective sides of a slot formed in its lower end to receive the lug.
A more or less open casing that is screwed at bottom on to the portion of the
union just below the valve seat encloses the valve and part of its spindle as also a
spiral spring that is interposed between the valve and the top of the casing; and
the casing is secured from unscrewing by a rivet placed in a hole formed partly in
the union and partly in the lower portion of the casing. The valve spindle
projects through a hole in the top of the casing and is or may be formed with a
knob by pulling which it can at any time be ascertained if the valve is in working
condition or has perchance stuck fast.
For higher pressures, a lever arm is pivoted to the upper end of the valve
spindle and a fulcrum is provided at the top of the casing, the top portion of this
fulcrum being formed with an edge on which the lever loosely rests.
In the above described construction the valve itself is exposed to view, and there
is no place in which dirt will be liable to collect to such an extent as to render the
valve inoperative-which is an important advantage seeing that safety valves of

page_text: this class are mostly fixed in positions where dust and grease accumulate and
frequently are left for years without examination.
. Dated this 19th day of March 1895.
ppeab
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
Improvements in Safety Valves for Kitchen Range and other
Hot Water Boilers.
I, JOHN WATKINS BARBER of 40 Fitzwilliam Road, Clapham, in the County
of Surrey, 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 has for its object the more effectual protection of domestic water
boilers such as kitchen range boilers and the like from liability to explosion
consequent upon the blocking of circulating pipes through incrustation, frost or
otherwise, and to enable the fires of such boilers to be kept alight at all times
without risk to life or property.
In safety valves as ordinarily constructed for boilers such as referred to, the
working parts are not readily accessible for inspection and cleaning; dirt is liable
to collect and to become gradually baked into scale, thus in a short time fastening
the valve to its seat; in the event of slight leakage of the valve, water is liable to
collect around and on top of the valve, and during a cold night to freeze and
prevent proper action of the valve. It cannot be readily ascertained whether the
valve is free to act, and the opening leading from the boiler is so small that the
valve when in its place almost fills the aperture, consequently the valve is liable to
become fixed by being furred up.
Now my invention is designed to obviate these evils, and to produce a strong,
durable, and reliable safety valve, which is exposed to view and easily accessible
for the purpose of cleansing; and beneath or near the valve there is no place in
which dirt would be likely to collect to such an extent as to render the valve
inoperative; this being an important advantage seeing that safety valves of this
class are in general fixed in positions where dust and grease accumulate, and
frequently are left for years without examination.
In order that my invention may be fully understood and ascertained I append a
sheet of drawings in which :-
Fig. is a vertical section of a valve and casing according to my invention.
Fig. 2 is an elevation of a valve removed from the casing.
Fig. 3 is a horizontal section through the valve casing shewing the valve seat.
Fig. 4 is a view of underside of valve.
A designates a tubular base or seating which I have called a union, and this is
formed with a flange a, a hexagonal part a', and a screw threaded end a² for
screwing into the top or other part of the boiler. It has also a screw-threaded
part a³
upon which a casing B screws, and its upper end at is shaped so as to form
an annular valve seat upon which the valve normally rests.
The casing B is annular in shape near its ends but has portions of the inter-
vening parts cut away to form openings 6 through which the valve C can be seen,
and handled. The upper end of the casing is bored so as to allow the valve stem c
to pass through and slide freely in it, while the lower end has a female screw-
threaded part 6 which is screwed upon the part a³ of the seating A, and which
may be secured in position by inserting a rivet, pin, or screw 62 in a hole

page_text: formed partly in the part a³ of the seating A and partly in the part 6' of the
casing B.
The valve C is circular in form and has wings c', which entering the bore of the
seating A act as guides and serve to prevent lateral movement of the valve. The
stem which projects through the top of the casing B may be formed integrally
with the valve but is preferably connected to it in the following manner as shewn
in the drawings. Formed integrally with or rigidly attached to the top of the
valve C is a lug c² having in it a slot through which passes a pin c. The lower
end of the stem c is slotted at c in such manner as to allow the lug c³ to move
freely in it to an extent which is limited by the pin e, this pin being fixed in the
slotted end of the valve spindle. The vertical height of the slot 3 being greater
than the diameter of the pin c, the lug c² and valve C can consequently rise from
the valve seat without moving the stem c.
A helical spring c" of any desired strength encircles the stem c, and its upper end
pressing against the end of the casing B and its lower end upon the valve C
normally tends to retain the latter upon its seat.
The upper end of the stem c projects through the top of the casing, and is formed
into a knob c', and a pin c³ passes through the stem and prevents it from falling
below its normal position. By pulling the knob c the valve can be lifted from its
seat and its condition ascertained.
For higher pressures a lever arm D and fulcrum d are employed as shewn in
dotted lines in Fig. 1. The fulcrum is formed by the projection d which is formed
integrally with or rigidly attached to the top of the casing B, and upon it rests the
lever D which is pivoted to the knob c or equivalent upper end of the stem c. By
making the lever sufficiently long the valve can be lifted from its seat for
examination even when an exceptionally powerful spring is employed.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. I safety valve for kitchen range or other hot water boilers in which the
casing surrounding the valve is so cut away that the valve and seating are exposed
to view, and the valve is easily moveable from its seat, substantially as shewn and
described.
2. In a safety valve for kitchen range and other hot water boilers, the com-
bination of a casing which is cut away so as to expose the valve to view, a union
forming a valve seat, and a valve normally pressed upon the seat by means of a
spring, and having its stem projecting through the top of the casing in such
manner that the valve can be easily lifted from its seat for examination, substan-
tially as described.
3. In a safety valve for kitchen range and other hot water boilers, the com-
bination of the casing B, the union A forming a valve seat, the valve C having a
slotted lug 2, the stem c, having a pin c passing across it, and the spring c
substantially as described and shewn.
4. In combination with the safety valve as hereinbefore described and claimed,
the lever D and fulcrum d arranged in the manner and for the purpose described
and shewn.
Dated this 19th day of December 1895
WILLIAM J. MUNDEN,
106 Priory Park Road, Kilburn, London, N.W.,
Agent for the Applicant.