Improved Combined: Safety Valve and Draw-off Cock, suitable for Kitchen-range and similar Bollers.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improved Combined: Safety Valve and Draw-off Cock, suitable for
Kitchen-range and similar Bollers.
I, ALEXANDER SPENCER, of 77 Cannon Street, in the City of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to an improved construction of combined safety
valve and draw-off cock of the kind in which the valve proper is normally held
upon its seat by a coiled' spring that will yield and permit the valve to open in the
event of the valve being subjected to undue pressure, such as might result from
accumulation of steam in a kitchen range or other "boiler to which it is applied.
In my combined safety valve and draw-off cock, the construction' is such that
normally the spring presses the valve to its seat with a pressure exceeding that due
to the head of water within the boiler, but such nevertheless that a small increase
of pressure beyond that limit in the boiler will cause the valve to open, thus
allowing escape of the steam causing such increase of pressure. The construction
of the apparatus is such that by turning a screwed cap or nut, the spring pressure
is released and the valve is then free to be forced open by the pressure of the
water against it, thus allowing water to flow out of the boiler until the spring
pressure is again applied to the valve so as to close it. An arrangement of such
a combined safety valve and draw-off cock is as follows:-The outer end of the
coiled spring surrounds an extension of the valve, and is normally compressed' by
a cap or cover that is screwed or otherwise mounted upon the body of the cock,
and is, or may be provided with an inward extension to serve as a guide for the
valve, the arrangement being such that upon turning the cap or cover in one
direction, it will be caused to move endways so as to relieve or reduce the pressure
on the spring and permit the valve to open under the pressure of the water thereon,
and when turned in the opposite direction, will compress the spring so as to hold
the valve in place on its seat, but so nevertheless as to permit the valve to open if
subjected to undue internal pressure as aforesaid. The extension of the valve is
tubular, and the extension or guide on the inner side of the cap or cover extends
freely into the valve extension: so that the said cap or cover can be turned in
either direction without rotating the valve. A stop is provided to limit the
extent of opening movement of the cap or cover, which may be in the form of
a wing nut.
"1 1005

page_text: Improved Combined Safety Valve and Draw-off Cock, suitable for
Kitchen-range and similar Boilers.
I, ALEXANDER SPENCER, of 77 Cannon Street, in the City of London, 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:-
This invention has reference to an improved construction of combined safety-
valve and draw-off cock of the kind in which the valve proper is normally held
upon its seat by a coiled spring that will yield and permit the valve to open in the
event of the valve being subjected to undue pressure such as might result from
accumulation of steam in a kitchen-range or other boiler to which it is applied.
In my combined safety-valve and draw-off cock the construction is such that
normally the spring presses the valve to its seat with a pressure exceeding that
due to the head of water within the boiler but such, nevertheless, that a small
increase of pressure beyond that limit in the boiler will cause the valve to open,
thus allowing escape of the steam causing such increase of pressure. The con-
struction of the apparatus is such that by turning a screwed cap or nut the spring-
pressure is released and the valve is then free to be forced open by the pressure of
the water against it, thus allowing water to flow out of the boiler until the spring-
pressure is again applied to the valve so as to close it.
An arrangement of such a combined safety-valve and draw-off cock is illustrated
in the accompanying drawings,
Fig. 1 being a vertical section,
Fig. 2 an end elevation, and
Fig. 3 a plan thereof,
1 is the body of the cock provided with an inlet-branch 2 and an outlet-branch 3;
and 4 is the valve proper, its seat 5 being formed in the body 1. 6 is a coiled
spring which surrounds an extension 7 of the valve 4 and is normally compressed
by a cap or cover 8, that is screwed upon the body 1 of the cock, is furnished with
wings 8, and is provided with an inward extension 9 to serve as a guide for the
valve 4. The arrangement is such that upon turning the cap or cover 8 in one
direction it will be caused to move endways-i.e., away from the seat 5-so as to
relieve.or reduce the pressure on the spring 6 and permit the valve 4 to open under
the pressure of the water thereon, and when the cap or cover 8.is turned in the
opposite direction it will compress the spring 6 so as to hold the valve 4 in place
on its seat ŏ but so, nevertheless, as to permit the valve to open if subjected to
undue internal pressure as aforesaid. The extension 7. of the valve is tubular, and
the extension or guide 9, on the inner side of the cap or cover 8, extends freely
into it, as shown, so that the said cap or cover can be turned in either direction
without rotating the valve. The arrangement shown is the one I prefer, but it is
obvious that the same.end may be attained with a tubular extension on the cap or
cover and a valve-extension fitting freely therein. A stop 10 is provided to limit,
in connection with a projection 11 on the cap or cover, the extent of opening-
movement of the said cap or cover.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A combined safety-valve and draw-off cock of the kind herein referred to,
wherein the spring by which the valve proper is controlled, is held in place by an
endways adjustable cap or nut such as 8 which, when turned in one direction, will

page_text: cause the valve to be pressed upon its seat with a pressure exceeding that due to
the heat of water within the boiler, but such nevertheless that a small increase of
pressure beyond that limit in the boiler will cause the valve to open, and when
turned in the opposite direction will release the spring pressure and permit the
valve to be forced open by the pressure of the water against it, substantially as
herein before described with reference to the drawings.
2. My improved combined safety-valve and draw-off cock constructed arranged,
and operating as hereinbefore described with reference to and shown in the
accompanying drawings.
Dated this 20th day of June 1895.
ALEXANDER SPENCER.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.