Improvements in Fittings for Water Level Gauges for Boilers.
Year: 1895

page_text: Date of Application, 2nd Nov., 1895
Complete Specification Left, 4th Aug., 1896-Accepted, 5th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Fittings for Water Level Gauges for Boilers.
I, REUBEN THOMAS PRESTON of the Firm of J. Stone & Co. of Deptford in
the County of Kent Engineers do hereby declare the nature of this invention to be
as follows:-
According to this invention I provide in connection with ball or other valves
which close automatically by the steam pressure in the boiler when the gauge glass
bursts, ready means for moving said valves from off their seatings again. The
means which I employ consist in the first instance in the steam pressure itself
which I employ in such manner that the shutting off the said taps opens a bye pass
or communication between the boiler and the back of the said valves thus restoring
equilibrium of pressure on both sides of the said valves which then immediately
by their own weight drop or roll from their seats. By this mode of action I
obviate the use of mechanical means such as thrust spindles for pushing the valves
off their seats, and I am enabled to ensure clear passages through the cocks for
cleaning purposes.
:
In the case of so-called steam packed cocks that is to say those in which the
steam acts in a space on the large end of the plug I provide the plug on one side
with a groove leading from the said space which communicates with the boiler,
down to the middle of the plug. The effect of this arrangement is that when the
cock is turned into the closed or off position steam from the boiler will flow from
the aforesaid small space behind the plug by the groove in the side of the plug.
to the main passage between the plug and the valve, thus establishing equilibrium
and causing the valve to drop or roll off its seat.
The valve I use is by preference a ball valve which normally lies in a recess
with gently sloping approaches towards the boiler and towards the cock; the
bottom of the recess consists by preference of the concave end of a set screw or
plug which is screwed into the fitting from below and can be removed for cleaning
purposes. The top of the ball would be about level with the bottom of the port
to the boiler, so as to give a clear vent through. The upper part of the chamber
may be made with a slight dip or downward projection or have a set screw with
wedge shaped point for the purpose of deflecting and guiding the rush of steam
and causing it to strike the ball more forcibly or surely.
In the case of fittings with ordinary cocks the arrangement of passages is very
similar the slanting passage leading directly to the groove in the side of the plug...
When the invention is applied to fittings with a ball valve arranged next to the
boiler in the port or passage thereto and generally provided with a guard wire
across said port I provide a small passage about parallel with the main port or
passage to the boiler and leading to a horizontal groove recess in the plug of the
cock.
Dated this 2nd day of November 1895.
፡

page_text: •
▸
• Improvements in Fittings for Water Level Gauges for Boilers.
I, REUBEN THOMAS PRESTON of the Firm of J. Stone & Co. of Deptford, in
the County of Kent, 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 :-
According to this invention I provide in connection with ball or other valves
which close automatically by the steam pressure in the boiler when the gauge
glass bursts, ready means for moving said valves from off their seatings again.
The means which I employ consists in the first instance in the steam pressure
itself which I employ in such manner that the shutting of the said taps opens a
bye pass or communication between the boiler and the back of the said valves thus
restoring equilibrium of pressure on both sides of the said valves which then
immediately by their own weight drop or roll from their seats. By this mode of
action I obviate the use of mechanical means such as thrust spindles for pushing the
valves off their seats after a fresh gauge glass has been put in and the apparatus is
to be put in action again and I am enabled to ensure clear passage through the
cocks for cleaning purposes.
Fig. 1 is a sectional side view of a water level gauge provided with so-called
steam packed cocks that is to say those in which the steam acts in a space on the.
large end of the plug; Fig. 2 is a plan section of one of the fittings. These
views shew a suitable mode of applying the invention to such a water level gauge
which moreover is constructed with glass shield held in a hinged framing as
described in my Patent Specification No. 21,455 of 1894. The steam acts on the
large end of the cock plug A in a space B which by the slanting passage C
communicates with the boiler. A steam packed tap having such a passage C is
described in Calaspane's Patent Specification No. 21937 of 1893. I provide such
a plug A on one side with a groove D leading from the aforesaid space B down to
the middle of the plug. The effect of this arrangement is that when the cock
plug A is turned into the closed or off position steam from the boiler will flow by
the slanting passage C, the space B and the groove D in the side of the plug A to
the main passage F between the plug and the valve seat G, thus establishing
equilibrium and causing the valve to drop or roll off its seat G.
The valve which I find perfectly efficient is a ball valve H which normally lies
in a recess with gently sloping approaches towards the boiler and towards the cock
as shewn in Fig. 1; the bottom of the recess consists by preference of the concave
end of a set screw or plug I which is screwed into the fitting from below and can
be removed for cleaning purposes. The top of the ball should be about level with
the bottom of the port F to the boiler so as to give a clear vent through. The
upper part of the chamber should be made with a slight dip or a downward
projection K shewn in end view in Fig. 3 (or it might be a set screw with wedge
shaped point), for the purpose of deflecting and guiding the rush of steam and
causing it to strike the ball more forcibly or surely. The projection K is in
Figs. 1 and 3 formed on the ferrule K, but in Fig. 4 it is shewn formed in the
fitting itself and of a little different shape.
Fig. 5 is a plan section of part of a fitting shewing the cock plug packed by
means of stuffing box and gland and provided with a groove D which when the
plug is turned one fourth round communicates with a slanting passage C and with
the passage F leading to the boiler.
Fig. 6 is a plan section of a fitting with a ball valve H arranged next to the
boiler in the port or passage F thereto and provided with a wire gauze guard Q
across said port as is well known. I provide in connection therewith a small
passage C. D is a groove in the plug of the cock. By turning the latter one

page_text: quarter round the passages C and D are connected and steam led from the boiler
to the back of the valve H.
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. In a gauge glass fitting and for the purpose of dislodging from its seat and
thus opening the valve which by reason of the breaking of the gauge glass had
been self actingly closed by the pressure from the boiler, the application and use,.
in connection with the shut off cock, of passages which when the said cock is turned
conduct steam from the boiler to the back of the valve and thus establish equilibrium.
on both sides of same, substantially as set forth.
2. The construction of gauge glass fitting as described with reference to
Figs. 1 to 4.
3. The construction of gauge glass fitting as described with reference to Fig. 5.
4. The construction of gauge glass fitting as described with reference to Fig. 6.
Dated this Fourth day of August 1896.
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents..
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents..