Improvements in Safety Valves for Domestic and such like Boilers.
Year: 1896

page_text: Date of Application, 11th Jan., 1896
Complete Specification Left, 10th June, 1896-Accepted, 18th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in Safety Valves for Domestic and such like
Boilers.
I, JOHN GOURLAY, of 460 Duke Street, in the County of the City of Glasgow,
Plumber, do hereby declare the nature of my invention to be as follows:-
This invention has reference to and comprises improvements in the construction
of safety valves specially designed for use on domestic boilers, such as are usually
employed for providing a circulating supply of hot water in dwelling houses, or
other buildings where such boilers are used, and has for its object the prevention
of explosions by permitting the escape of any high pressure steam that may be
generated therein."
The valve, which may be placed on the circulating tauk, or on any convenient
part of the circulating pipes, or may be placed on the mantelpiece above the
kitchen fire heating the boiler, and be connected to the circulating pipes by a pipe
led to same, would be constructed as follows:-
The valve chest would be preferably bulbous in shape and have a screwed neck
at the lower part for securing it in position, and a plain tubular part at the top to
receive and fit the valve spindle, while the valve seat would be formed at the lower
part of the bulb.
The valve spindle would be hollow with closed ends and the valve would be
formed at its lower end to fit the valve scat. Openings would be formed through
the lower part of this hollow spindle above the valve, to permit any escaping steam
to pass within the spindle, and openings or a slit would be formed through the
upper part of the spindle to allow the steam to escape to the atmosphere. A slot
would be formed through the hollow spindle, and a pin would be screwed through
the tubular part at top of the valve chest and enter this slot to prevent the valve
spindle being lifted out, or higher than necessary. A collar would be formed on or
secured around the lower part of the valve spindle to support one or more annular
weights placed thereon.
Dated the 10th January 1896.
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Safety Valves for Domestic and such like
Boilers.
I JOHN GOURLAY of 460 Duke Street in the County of the City of Glasgow
Plumber do hereby declare the uature 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 and comprises improvements in the construction
of safety valves specially designed for use in domestic boilers, such as are usually
employed for providing a circulating supply of hot water in dwelling houses, or
other buildings where such boilers are used, and has for its object the preventiou
077

page_text: of explosions by permitting the escape of any high pressure steam that may be
generated therein.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended an explanatory sheet of drawings in the two
figures of which corresponding parts are marked with the same letters of
reference.
Fig. 1 is a front elevation of my improved safety valve and Fig. 2, is a vertical
section of the same showing the valve raised to its maximum height.
The valve which as indicated by the letter A, may be placed on the circulating
tank or in any convenient part of the circulating pipes, or may be placed on the
mantlepiece above the kitchen fire heating the boiler and be connected to the
circulating pipes by a pipe lead to the same is constructed as follows:-
The chamber B. of the said valve as seen both in Figs. 1, and 2. is bulbous or
spherical in shape and terminates downwardly in a screwed neck in order to secure
it in position wherever it is intended to be mounted, while the upper end of the
said chamber is of a cylindrical configuration in order to afford free motion to the
valve spindle C, which it embraces. The tendency of the said spindle C, is to rise
from its seat D. and that in proportion to the pressure exerted upon it. The
cylindrical form of the upper part of the said chamber performs the function of a
guide during the rise of the said spindle C, as well as to retain it in its normal
position.
An elongated slot e, is formed in the said spindle C, and a transverse pin or
stud d, screwed in the valve chamber B, and working in the said slot prevents the
spindle rising too high and determines its maximum limit.
The said spindle C, is of a hollow tubular form with closed ends, top and bottom.
Orifices e, and, are formed around the said spindle above its seat which
communicate with its interior.
Steam from the boiler at a certain pressure will raise the valve C, from its
seat D, and find its way into the bulbous portion of the valve chamber escaping by
the orifices or ports e, and f, aforesaid to the upper end of valve spindle where
it will finally issue from the blow off ports or orifices g. To ensure the steam
blowing off at any given pressure, one, two, three, or more counterweights E, F,
and G, may be employed. These counterweights are supported or carried by the
collar or shoulder h, formed on the said valve spindle.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :
The general arrangement and combination of parts constituting the safety valve
operating substantially as and for the purposes hereinbefore described and shown
on the accompanying sheet of drawings.
Dated this 20th - M 1000
JOHN GOURLAY.