Improvements in Combined Safety and Stop Valve Fittings for Steam Boilers.
Year: 1886

page_text: Date of Application, 10th Nov., 1886.
Complete Left, 5th Aug., 1887.
Complete Accepted, 13th Sept., 1887.
PROVISIONAL SPECIFICATION.
Improvements in Combined Safety and Stop Valve Fittings for
Steam Boilers.
We, GEORGE COCKBURN, and ALLAN WATSON BAIRD, of the firm of George
Cockburn and Company, of Sussex Street, Kinning Park, in the County of Renfrew,
North Britain, Engineers, do hereby declare the nature of this Invention to be as
follows, that is to say :-
Our said Invention has for its object by improving the construction, or conformation,
to provide combined safety and stop valve fittings, which whilst only requiring the
making of a single hole through the shell of a boiler, are free from the objections to
which some kinds of fittings for the same purpose are liable.
In carrying out our Invention we make a casing for one or two safety valves and
for a stop valve in one casting, which is made with a flange for bolting down upon
the boiler shell, and with a nozzle or pipe end projecting down beyond the flange to
enter the hole in the boiler shell. The hole and nozzle or pipe end are by preference
round but may be made oval or of any other suitable form if preferred. The casting
is formed with an internal partition or otherwise so that the communication between
the interior of the boiler and the safety valve or valves is quite distinct from that
between the interior of the boiler and the stop valve; and in this peculiarity of the
construction lies the essential and distinguishing feature of the Invention. The space
in the casting and the short pipe-like part communicating with the interior of the
boiler may be divided in any convenient way into the two passages or spaces-for
example a flat or curved partition may be formed across the casting so as to divide

page_text: the space in suitable proportions, or an inner pipe-like passage may be formed to
communicate with the stop valve with an annular passage formed round it to
communicate with the safety valve or valves.
Sometimes when cleaning or making repairs especially where there are two or
more boilers in connection, the passage to the stop valve has to be temporarily closed
by a plug or bag to stop leakage from another boiler, and if the plug is neglected to
be removed on restarting the boiler great danger arises if the one passage leads to the
safety valve or valves as well as to the stop valve. With our improved construction
however there never can be any necessity or excuse for closing the separate passage
to the safety valve or valves and the danger referred to is consequently avoided.
Dated this Ninth day of November 1886.
EDMUND HUNT,
Applicants' Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Combined Safety and Stop Valve Fittings for
Steam Boilers.
We, GEORGE COCKBURN, and ALLAN WATSON BAIRD, of the firm of George
Cockburn and Company, of Sussex Street, Kinning Park, in the County of Renfrew,
North Britain, Engineers, 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, that is to say :-
Our said Invention has for its object by improving the construction or conformation
to provide combined safety and stop valve fittings, which whilst only requiring the
making of a single hole through the shell of a boiler are free from the objections to
which some kinds of fittings for the same purpose are liable.
In carrying out our Invention we make a casing for one or two safety valves and
for a stop valve in one casting, which is made with a flange for bolting down upon
the boiler shell. The hole in the boiler shell is, by preference, round but may be
made oval or of any other suitable form if preferred. The casting is formed with an
internal partition or otherwise so that the communication between the interior of the
boiler and the safety valve or valves is quite distinct from that between the interior of
the boiler and the stop valve; and in this peculiarity of the construction lies the
essential and distinguishing feature of the Invention. The space in the casting may
be divided in any convenient way into the two passages or spaces; for example a flat
or curved partition may be formed across the casting so as to divide the space in
suitable proportions; and this partition may either be made in a piece with the
casting or separate and held in position between ribs formed on the casting; or an
inner pipe-like passage may be formed to communicate with the stop valve with an
annular passage formed round it, to communicate with the safety valve or valves
And in order that our said Invention and the manner of performing the same may
be properly understood we hereunto append a sheet of explanatory drawings to he
hereinafter referred to and showing our Invention as applied in connection with two
safety valves and a stop valve.
Figure, 1, on the accompanying sheet of drawings is a plan and figure, 2, is a side
elevation, partly in section, of the valve fitting.
In this modification a single casting, 3, is made so as to contain a stop valve, 4,
and two safety valves, one, 5, of which is shown in section in figure, 2, the safety
valve being shown as of the kind loaded by a spring, 6. The casting, 3, is made.
with a flange, 7, for bolting down upon the boiler shell, 8, a ring, 9, being interposed
as usual. The space in the casting, 3, beneath the valve seats and which communicates
with the interior of the boiler is divided into two passages or spaces, 10, 11, by a
diametrical partition, 12, formed across the casting so that the communication
between the interior of the boiler and the safety valves is quite distinct from that
between the interior of the boiler and the stop valve, 4.

page_text: Sometimes when cleaning or making repairs especially where there are two or
more boilers in connection, the passage, 10, to the stop valve, 4, has to be temporarily
closed by a plug or bag to stop leakage from another boiler; and if the plug is
neglected to be removed on restarting the boiler great danger arises if the one
passage leads to the safety valves as well as to the stop valve. With our improved
construction however there never can be any necessity or excuse for closing the
separate passage, 11, leading to the safety valves, and the danger referred to is
consequently avoided. Also internal priming pipes can by this arrangement be fitted
to the passage, 10, leading to the stop valve without interfering with the passage, 11,
leading to the safety valves.
Having now particularly described and ascertained the nature of our said Invention
and in what manner the same is to be performed, we declare that what we claim is :-
The combination of one or two safety valves and a stop valve in one casting which
has the space in it communicating with the interior of the boiler divided into two
distinct passages substantially as and for the purposes hereinbefore described.
Dated this Fourth day of August 1887.
EDMUND HUNT,
Per pro. David Ferguson,
Applicants' Agent.