Improvements in or applicable to Pressure Gauge Mountings of Steam Boilers.
Year: 1896

page_text: Date of Application, 15th Aug., 1896
Complete Specification Left, 13th May, 1897-Accepted, 19th June, 1897
ONAL SPI CIFIC TION.
Improvements in or applicable to Pressure Gauge Mountings of
Steam Boilers.
We JAMES ASHTON FLETCHER and SAMUEL FLETCHER of Borough Brass
Works, Ashton-under-Lyne, Brass Founders, do hereby declare the nature of this
invention to be as follows:-
Our said invention relates to improvements in or applicable to the mounting
carrying the pressure gauge of a steam boiler.
The object of our said invention is to enable a second or testing pressure gauge
to be applied to the mounting (for the purpose of checking the accuracy of the
working gauge) without cutting off the steam pressure from the working gauge by
turning the cock controlling the flow of steam from the boiler. To accomplish
this we apply to the mounting a second cock or valve which when closed prevents
the escape of steam or water from the syphon or other pressure gauge mounting
but which when open gives access to the testing pressure gauge for which a fitting
is applied to the mounting.
By the use of two cocks on such a mounting a testing gauge may be applied and
removed without temporarily interfering with the communication between the
working pressure gauge and the interior of the boiler. The testing of the working
gauge is thus performed with the working gauge in its normal working and more
reliable comparisons are obtainable than when the steam is first cut off and
readmitted before the comparison is made.
12th do
1806
E. T. WHITELOW, A.M. Inst., C.E.,
70 Deansgate, Manchester, Agent for the Applicants.
Improvements in or applicable to Pressure Gauge Mountings of
Steam Boilers.
We JAMES ASHTON FLETCHER and SAMUEL FLETCHER of Borough Brass
Works, Ashton-under-Lyne, Brass Founders, 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 :-
Our said invention relates to improvements in or applicable to the mounting for
carrying the pressure gauge of a steam boiler.
The object of our said invention is to enable a second or testing pressure gauge
to be applied to the mounting for the purpose of checking the accuracy of the
indications of the working gauge under its actual working conditions without
cutting off the steam pressure from the working gauge while applying the testing
gauge.
To accomplish this we apply to the mounting a second cock or valve which when

page_text: closed prevents the escape of steam or water from the syphon or other pressure
gauge mounting but which when open gives access to the testing pressure gauge
for which a fitting is supplied to the mounting.
In order to more clearly set forth our said invention we will describe it with
reference to the accompanying drawings, in which
Fig. 1 is a sectional elevation of a syphon type of gauge mounting.
Fig. 2 is a sectional elevation through - (at right angles to the elevation in
Fig. 1) of an annular internal fitting hereinafter described.
In the said drawings a is a so called syphon mounting connected by a flange b or
in any other convenient manner to the boiler. Steam enters the mounting along
the passage c. The lower part a' forms a closed tube to contain water. In the
centre thereof is a syphon tube d descending nearly to the bottom of the tube a¹
and communicating interually with the working pressure gauge which is fixed at e
by means of a screwed connection.
The accessory mounting is attached to or formed integral with the mounting a
and is provided with a suitably screwed party' on or into which the testing gauge
may be applied and to which steam passes from the mounting a along the passage c¹.
A cap or plug closes the outlet fl when the testing pressure gauge is removed.
The main cock for admitting or shutting off the steam supply is fixed at g.
In mountings as heretofore constructed it has been necessary to first close the
cock g before applying the testing pressure gauge and then to readmit steam to the
mounting. By such a procedure the working pressure gauge is however not tested
under its actual working conditions inasmuch as any dirt or other accumulated
matter in the mounting or in the steam passages may be removed or displaced by
such shutting off and readmission of the steam.
In order to avoid the necessity of closing the cock g we apply a second cock g¹ to
the accessory mounting by closing which the testing gauge may be attached.
When the testing gauge has been applied the cock 9 is opened and steam is
admitted to the testing gauge.
The testing of the working gauge is then performed with the working gauge in
its normal working state and more reliable comparisons are obtainable.
It order to facilitate the cleaning of the steam passages co¹ we prefer to apply
to the upper part of the syphon tube d a tube carrier d' consisting of an annular
tube which forms in effect a double branched tube with its ends reunited. The
interior of the annulus or the clear way between the branches is placed in line
between the passages cc of the mounting. When thus constructed the syphon
tube does not offer any obstacle to the passage of a cleaning rod through the
passage in the accessory mounting f to that in the principal mounting a.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
A steam pressure gauge mounting having a seating or fitting for the working
gauge and a separate seating or fitting for a testing gauge in combination with an
intervening cock or valve substantially as and for the purpose set forth and
shown.
Dated L AL
E. T. WHITELOW, A.M. Inst. C.E.,
70 Deansgate, Manchester, Agent for the Applicants.