Improvements in Valve Apparatus applicable to Exhaust and Supplementary Live Steam and other Injectors.
Year: 1899

page_text: Date of Application, 9th Oct., 1890
Complete Specification Left. 5th July, 1900-A ocepted, 11th Aug., 1900
Complete Specification Left. 5th July, 1900-A ocepted, 11th Aug., 1900
PROVISIONAL SPECIFICATION.
Improvements in Valve Apparatus applicable to Exhaust and
Supplementary Live Steam and other Injectors.
We, JAMES CROXON METCALFE and RICHARD DAVID METCALFE, of 32, North
Parade, Aberystwyth, in the County of Cardigan, Engineers, do hereby declare
the nature of the said invention, to be as follows:-
-
1. Our invention refers more particularly to the overflow valve apparatus of the
supplementary live steam injector combined with an exhaust steam injector, but
is applicable to the overflow of the exhaust steam injector when required.
These overflow valves have most commonly consisted of a valve opening out-
wards but controlled so that they are allowed to open and are closed by a dia-
phragm acting upon a diaphragm head connected with the stem of the outward
opening overflow valve, the pressure of fluid acting upon this diaphragm to close
the valve being conveyed by a pipe or passage, from the casing of the injector at
a point before it passes the clack valve to the chamber at the outside of the
diaphragm.
These diaphragms are liable to fail or become damaged, and are a source of
trouble and expense to maintain, and the object of our invention is to dispense
with the diaphragm.
Our invention consists in substituting for the 'diaphragm a piston of small
diameter, the periphery of which has grooves in it and which can be ground to
fit its cylinder so as to be fluid tight without packing by preference, and in order
that the piston may be of small diameter and yet to give the required
pressure to close the overflow valve, the stem of the piston valve is connected
and made to act on the stem of the overflow valve, by a lever which has the
necessary, leverage in favor of the piston by placing its fulcrum nearer to the
stem of one valve than the other.
The stem of the overflow valve passes through a suitable guide and need not
be fluid tight in the guide, which may be a cap or cover enclosing the overflow
valve which has its outlet to a pipe from the casing of the overflow valve.
This arrangement of overflow valve and piston and lever in respect to the casing
of the injector, may be in any desired position, and the lever may also be arranged
in any desired position, and may be all in one piece, or may consist of two arms
secured on a fulcrum shaft-or compound levers may be used.
The piston cylinder, the part for the fulcrum of the lever, and the casing for
the overflow valve may be in one casting or separate.
The overflow valve may also be arranged so that when the injector is not in
action it will open and allow fluids to drain from the injector casing.
In some cases the overflow valve closes when moved outwards, and is drawn
outwards by a helical spring, the piston and lever is or may then be arranged
to open the valve by forcing its stem inwards.
The apparatus may be arranged and combined with the exhaust and supple-
mentary live steam injectors in a variety of ways.
2. Our invention also consists in applying a piston to close the flap nozzle of

page_text: flap nozzle injectors, especially the flap nozzles of exhaust injectors subject to
powerful blast from the exhaust steam.
In this case we use the small piston herein before described and lever and
another similar small piston to pass through the side of the casing of the, injector,
the inner end of which piston comes against the "Hap" of the injector and closes
it as above explained when the jet has been established by pressure of the fluid
delivered by the injector acting on one piston and moving the other as above
explained.
In some cases our invention also consists in using a diaphragm to close the
flap of flap nozzle injectors of the above named class by the pressure of the fluid
delivered from the injector when working, acting upon the diaphragm.
3. Another part of our invention is applicable to injectors supplied with water
from a head which will escape at the overflow opening of the injector when it
ceases to work.
In this case our invention consists in applying a valve to close the overflow
outlet from the injector, which valve we connect with a small piston such as
those above described and by a lever the piston being acted upon by the pressure
of water coming to the feed water branch of the injector, so that when the
injector ceases to work, the pressure of the feed water will act upon the piston
and through the lever upon the valve closing the overflow outlet, and thus prevent
waste of feed water after the injector ceases to work
We also carry out this part of our invention by acting upon the valve by a
diaphragm which is operated by the pressure of the feed water coming to the
water feed branch of the injector and closes it in like manner when the injector
ceases to work.
Dated this Seventh day of October 1899.
PETER J. LIVSEY,
Agent.
Improvements in Valve Apparatus applicable to Exhaust and
Supplementary Live Steam and other Injectors.
We, JAMES CROXON METCALFE and RICHARD DAVID METCALFE, of 32, North
Parade, Aberystwyth, in the County of Cardigan, 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:-
1. Our invention refers more particularly to the overflow valve apparatus of the
supplementary live steam injector combined with an exhaust steam injector, but
is applicable to the overflow of the exhaust steam injector when required.
These overflow valves have most commonly consisted of a valve opening out-
wards but controlled so that they are allowed to open and are closed by a dia-
phragm acting upon a diaphragm head connected with the stem of the outward
opening overflow valve, the pressure of fluid acting upon this diaphragm to close
the valve being conveyed by a pipe or passage from the casing of the injector at
a point before it passes the clack valve to the chamber at the outside of the
diaphragm.
These diaphragms are liable to fail or become damaged, and are a source of
trouble and expense to maintain, and the object of our invention is to dispense
with the diaphragm.
Our invention consists in substituting for the diaphragm a piston of small
diameter, the periphery of which has grooves in it and which. can be ground to

page_text: fit its cylinder so as to be fluid tight without packing by preference, and in order
that the piston or plunger may be of small diameter and yet to give the required
pressure to close the overflow valve, the stem of the piston valve is connected
and made to act on the stem of the overflow valve, by a lever which has the
necessary leverage in favor of the piston by placing its fulcrum nearer to the
stem of one valve than the other.
The stem of the overflow valve passes through a suitable guide and need not
be fluid tight in the guide, which may be a cap or cover enclosing the overflow
valve which has its outlet to a pipe from the casing of the overflow valve.
This arrangement of overflow valve and piston and lever in respect to the casing
of the injector, may be in any desired position, and the lever may also be arranged
in any desired position, and may be all in one piece, or may consist of two arins
secured on a fulcrum shaft--or compound levers may be used.
The piston cylinder, the part for the fulcrum of the lever, and the casing for
the overflow valve may be in one casting or separate.
The overflow valve may also be arranged so that when the injector is not in
action it will open and allow fluids to drain from the injector casing.
In some cases the overflow valve closes when moved outwards, and is drawn
outwards by a helical spring, the piston and lever is or may then be arranged
to open the valve by forcing its stem inwards.
The apparatus may be arranged and combined with the exhaust and supple-
mentary live steam injectors in a variety of ways.
2. Our invention also consists in applying a piston to close the flap nozzle of
flap nozzle injectors, especially the flap nozzles of exhaust injectors subject to
powerful blast from the exhaust steam.
In this case we use the small piston herein before described and lever and
another similar small piston to pass through the side of the casing of the injector,
the inner end of which piston comes against the "flap" of the injector and closes
it as above explained when the jet has been established by pressure of the fluid
delivered by the injector acting on one piston and moving the other as above
explained.
In some cases our invention also consists in using a diaphragm to close the
flap of flap nozzle injectors of the above named class by the pressure of the fluid
delivered from the injector when working, acting upon the diaphragm.
Fig. 1, is a longitudinal section, and
Fig. 2, a cross section at A-B Fig. 1, of the supplementary portion of a com-
bined exhaust and supplementary live steam injector, the exhaust portion of
which not being shown.
Fig. 3, is a longitudinal section, and
Fig. 4, a cross section on the line C-D Fig. 3 of a combined exhaust and
supplementary live steam injector in the same casing.
Fig. 5, is a longitudinal section of the supplementary live steam portion of a
combined exhaust and supplementary live steam injector, the supplementary part
being what is termed a combination injector.
Fig. 6, is a longitudinal section of an exhaust injector illustrating our improve-
ments.
Fig. 7, is a longitudinal section showing the application of our invention in
place of a diaphragm for automatic steam valves used in connection with
injectors.
By Figs. 1 and 2, the application of our invention is shown combined with a
supplementary live steam injector, which is combined with an exhaust steam
injector, the delivery from the latter being connected with the flange a¹, of the
casing a. a², is the flange junction for live steam; a³, is the flange for delivery
from the combined injectors.
The nozzles being well known will be understood by inspection of the figure.
b, is the overflow valve, the stem of which is guided at its inner end in a hole
in a cross bar, and at its outer end in a hole in a disc a, screwed into the casing

page_text: for the overflow; the flange junction a³, for the overflow pipe being indicated by
peculiar dotted line.
On the disc part a, projections are or may be formed to carry the fulcrum c¹
of a lever c, one end of which may be weighted to cause it to rest on the outer
end of the stem of the overflow valve b, the other end of this lever passes into an
eve (see Fig. 2) formed at the upper end of a piston d, which fits into a cylinder e,
in a tube that can be screwed fluid tight into the casing of the injector, coming
into a space or chamber f, in communication by a passage f¹, with the delivery
passage g, from the injector.
At the bottom end of the chamber f, for the piston there is a screw plug f2, the
inner end of which will form a stop to limit the extent to which the end of the
piston may come.
'
The piston is ground by preference into the cylinder e, fivid tight, and the
grooves round its circumference help to prevent the fluid from passing it. The
pressure upon the inner end of the piston d, acts to close the overflow valve b,
and allows it to open when the injector is being started, as then the pressure at
the delivery has not attained its maximum.
Figs. 3 and 4, illustrate our invention applied to an exhaust and supplementary
live steam injector combined together in the same casing.
This combined injector is the subject of Letters Patent granted to Davies and
Metcalfe numbered 970 of 1895 shown by Figs. 13 and 14 and therefore need not
be further described except to name some of the parts.
a, casing of injectors.
a, junction for exhaust steam.
h, supplementary live steam nozzle within exhaust steam nozzle.
a, branch for water.
a², branch for live steam to the supplementary injector.
a, branch for delivery.
a, overflow from exhaust injector.
a, overflow from supplementary live steam injector.
The overflow valve b, for the supplementary live steam injector, the lever c, and
piston d, for actuating it, are arranged as described in reference to Figs. 1 and 2,
and will be readily understood, as the same letters of reference are used in both
modifications.
The overflow from the valve b, is taken by a side passage to the pipe a³.
Fig. 5, illustrates the application of our invention to what are known as
supplementary live steam combination injectors, in which the steam supplied to
the injector and the delivery are in passages in the same flange by which it is
connected with the boiler.
The delivery from the exhaust injector comes to the branch a¹, and passes to
the chamber 8 round the live steam nozzle of the supplementary live steam
injector.
The nozzles and other parts will be readily understood.
a, is the passage for steam from the boiler.
a³, is the passage for delivery from the injector to the boiler,
g, the delivery valve.
a. the junction for overflow.
The overflow valve b, lever c, and piston d, are also arranged in their application
in a manner similar to those already described in reference to Figs. 1 and 2 and
will be readily understood from the reference letters thereon.
Fig. 6, illustrates our invention as applied to the overflow valve of exhaust in-
jectors and for acting upon the hinged flap of the exhaust injector.
The fulcrums c¹, of the levers c, in these cases are or may be on parts from the
casing a, of the injector, both pistons d, are in communication with the delivery
chamber of the injector.
The movement from the piston-d, for the exhaust flap nozzle is transmitted
through a rodd, fitted like a piston into a cylinder as shown.

page_text: This rod, may have a head on its exterior end within a chamber for a
diaphragm, and the diaphragm chamber above the head and exterior of the
diaphragm is brought in communication with the delivery by a small pipe so
that the pressure of fluid in the delivery will act to close the flap nozzle.
When our improvements are applied to the flap nozzle or the overflow valve of
exhaust injectors, the pistons d, are not intended to act upon the rod d, on stem
of the valve b, only when the pressure in the delivery has attained a certain
pressure say 50 lbs. on the square inch, and there is a spring d¹ and b, in each
case, which resists the action of the pistons d, until that pressure is attained.
The injector may be used in any desired position, but when used with the flap
nozzle opening downwards the piston d, helps to close it.
Fig. 7, shows a valve similar to that illustrated in Figs. 1 and 2, of James
Metcalfes Specification of Letters Patent No. 21080 of 1898, of an automatic
steam valve for supplying steam to injectors as therein described, and illustrates
the application of our invention of piston and lever in place of the diaphragın
described in the said Specification No. 21080 of 1898.
h, inlet for steam which after passing the valve i, passes to the injector or
injectors from the branch j.
The stem of the valve i, passes through a disce a, and one end of the lever c,
acts upon its end, and the other end upon the end of the piston d, which is in a
cylinder e, formed in a projection from the casing a.
The lower end of the cylinder e, has a tubular screw plug e¹, to which a pipe is
coupled in connection with the steam chest or other vessel, the pressure of fluid in
which is to act to open and close the valve.
The stem of the valve i, is or may be arranged same as the rod d*, Fig. 6, to
be steam tight in the hole in the part a, guiding it--and the inner face of the
disc at, is or may be formed as a valve seating to be steam tight when the facing
formed on the back of the valve i, in opening comes against it.
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 :-
1. The use and application of a piston, cylinder and lever in combination with
overflow valves, hinged flap nozzle or automatic steam supply valves as a sub-
stitute for diaphragms hitherto used, in combination with injectors and automatic
steam supply valves, substantially as hereinbefore described and illustrated by
the drawings.
2. The combination of piston, cylinder and lever with overflow valves, sub-
stantially as herein before described and illustrated by Figs. 1 and 2; Figs. 3
and 4; Fig. 5; Fig. 6 and Fig. 7 of the drawings.
3. The closing or assisting to close the flap of the flap nozzle of exhaust in-
jectors, by piston or diaphragm, substantially as hereinbefore described and
illustrated by reference to Fig. 6 of the drawings.
4. The closing or assisting to close the overflow valve of exhaust steam in-
jectors substantially as hereinbefore described and illustrated by the drawings.
Dated this Fourth day of July 1900.
PETER J. LIVSEY,
Agent.