Improvements in Pipe Couplings and Traps for the Steam Heating and Air Brake Systems of Railway Vehicles.
Year: 1891

page_text: Date of Application, 8th Oct., 1891
Complete Specification Left, 7th July, 1892-Accepted, 13th Aug.; 1892
PROVISIONAL SPECIFICATION.
Improvements in Pipe Couplings and Traps for the Steam Heating
and Air Brake Systems of Railway Vehicles.
I, EDWARD ETHEL GOLD, of Number 107 West 95th Street, in the City of
New York, in the County and State of New York, United States of America,
Manufacture", do hereby declare the nature of this invention to be as follows:-
This invention relates in part to couplings for joining together flexible or articu-
lated pipes or hose, being especially designed for coupling the terminal lengths of
hose applied to the steam-heating or air-brake pipes of railway carriages. My
improved coupler is of that general class wherein the coupling heads have ports or
seats at their ends and coupled together end to end so that the steam passage is not,
diverted laterally, the heads being provided with reciprocally engaging locking
projections which wedge together by a downward movement so that the weight of
the coupling tends to hold them in engagement. My invention provides certain
improvements applicable chiefly to couplings of this class, although applicable also
in part to other types of couplings.
My invention also in part relates to steam trape or trap-valves for draining off
water of condensation from the couplings and pipes of heating systems of railway
vehicles. My improved trap is a dynamic or pressure trap, its valve being con-
structed to open outwardly so that it is closed and held to its seat by internal
pressure, but when the pressure is turned off it opens automatically and drains out
any accumulated water of condensation. My invention provides an improved con-
struction of such valves applicable particularly to steam-pipe couplings, as well as
other parts of the steam-piping of railway carriages.
I will now proceed to more particularly describe my improved pipe or hose
coupling, and the application of my improved trap thereto. The coupling comprises
two coupling heads or sections having ports or seats at their meeting ends formed
with a steam passage through them, and provided at their opposite ends with suitable
means for attachment to the respective lengths or sections of hose (or flexible or
articulated pipe as the case may be) that are to be coupled or joined together, this
hose connection being ordinarily a tubular neck or shank entering the hose and
fastened to it by an external clamp or ring. The coupling heads are preferably in
the form of blocks or cylinders fitting together at their ends, each head being
provided with a projecting seat or seating face so arranged that as the heads are
locked together these seats are forced into firm contact to make a tight joint with
one another. The heads are provided with reciprocally engaging locking projections
consisting preferably of a lug or disk-like projection on one side of the head, and a
locking arm projecting forward from the other side and carrying at its outer end
a hooked projection having a cam-shaped or eccentric locking face adapted to
engage the projection on the side of the opposite head. This latter projection
formed as a wheel or roller mounted on a pivotal stud projecting from the side of
the head. The hooked projection has its locking face of such shape that in
engaging with the side of the projection or roller it forms a tight wedging engage-
ment therewith which presses the two heads firmly together. The heads are
coupled by being put together in an upward oblique position and then moved down-
ward with a rocking movement which wedges their locking projections firmly
together and forces their seating faces into tight contact.
To ensure the correct abutment of the heads and bring their seating faces into
exact coincidence, the heads are formed with guides which project from their
meeting ends and by their mutual engagement bring the seating fates into exact

page_text: coincidence and hold them against displacement. These guides consist of a pro-
jecting pin or male guide on each head on one side of the seat, and a female guide
or socket on each head on the opposite side of the seat, so that in coming together
the male guide on each head enters the opposite female guide on the other. The
female guides are formed as projecting bosses with flat outer faces sufficiently
extended to avoid injury to the seating faces in case of contact therewith, the
sockets formed in these bosses extending backward and being made bottomless by
branching laterally, so that any dirt which may enter the socket will find its way
out through the side opening. Both the male and female guides project a distance
less than twice the projection of the seating faces, in order that they shall not
interfere with the intercoupling of the head to which they are applied with a similar
coupling head unprovided with such guides. Thus a carriage provided with my
improved coupling may have its steam-heating or air-brake pipes readily coupled
with those of another carriage having couplings of the same general type con-
structed as has heretofore been usual.
An important feature of my invention consists in the construction of the seats as
compensating seats. To this end I form them as rings or gaskets of suitable shape
having flat outer seating faces and convex rear faces, the latter being fitted into
concave sockets of corresponding shape formed in the ends of the coupling heads.
The convex rear faces of the seats are formed either as segments of spheres or as
segments of cylinders. If formed as segments of spheres they are capable of tilting
in any direction and thereby affording a universal compensation, which ensures that
the seating faces shall make a steam or airtight joint with one another notwith-
standing any degree of wear to which they may have been ordinarily subjected. If
made as segments of cylinders, the seats will compensate in one direction only. For
a coupling of the type already described wherein the seating faces are joined by
a rocking movement in coupling, and wherein consequently the wear upon the
seating faces is chiefly at the lower sides thereof, it is sufficient to make the seats as
segments of cylinders, the axis of the cylinders being horizontal, and this form
presents certain advantages as applied to such couplers.
For general purposes, however, it is preferable to construct the seats as segments
of spheres fitted into segmento-spherical sockets in the ends of the heads, whereby
each seat constitutes in effect a ball-and-socket joint affording compensation for wear
in all directions. When the two seats come together, if their flat outer faces are
not perfectly parallel, one or both of the seats will oscillate in its socket sufficiently
to bring the two seating faces into the same plane. In order that the seats shall
form a steam or airtight joint not only with the face of the opposite seat but with
the socket in the head, it is either formed of rigid material and ground to a true fit,
or preferably is moulded of a sufficiently yielding composition. In the latter case,
in order to prevent the compression of the seat and the contraction of the steam
port or opening through it, the composition is formed around a metallic thimble.
To limit the tilting movement of the seat, it is formed with two projections or
fingers at top and bottom held within notches formed in the socket, by striking
against which notches the fingers serve as stops.
To hold the seat in place and prevent its dropping out of the socket, I provide
by preference a spring-clip pivotally engaging the seat and having an elastic
engagement with the interior of the head. This clip is preferably formed of wire
with its ends turned outwardly and entering pivotal holes in the opposite sides of
the seat, and extending thence backwardly and curving outwardly within the head.
so that the sides of the wire spring into notches in the sides of the head so as to
form a strong frictional engagement therewith, and by reason of the elastic outward
pressure thereagainst, tending to move inward within the head and thereby holding
the seat drawn firmly back into its socket. The clip is formed with a reverse loop
at the middle, so that by inserting a hook through the seat engaging this loop and
then pulling forward, the clip is contracted laterally and the clip and seat are
drawn outward until disengaged, so that the sent may be readily examined or a new
seat substituted for an injured or defective one. Each coupling head is provided

page_text: back of the seat and locking projections with a lateral opening in which is applied
my improved drainage trap. This trap consists of a screw plug or body having
preferably a hexagonal projecting head by which to screw it in or out, formed with
an opening through the body and provided with a self-seating gravity-valve at the
inner side of the body. This valve consists of a disk seating against the seat
formed on the inner end of the body or plug. The valve is fixed on a stem which
passes through the hole and has mounted on its outer end an impact or baffle-disk
preferably arranged within a protecting chamber formed in the hexagonal head.
The disk is kept in central position on the seat by the stem nearly filling the inner
end of the hole, which is conical. The baffle-disk and outer end of the stem serve
as a counterweight to throw open the valve by tilting it on its seat. In this position
the water of condensation drains out of the coupling head. When the steam or com-
pressed air is turned on the pressure closes the valve, or if it fails to do so, the jet
of escaping steam or air impinging against the baffle-disk will throw the latter
outward and thereby close the valve. The inner end or seating face of the plug
may be made vertical, or preferably it can be inclined, so that as the valve seats it
will be thrown diagonally upward, thereby affording a larger area of opening when
the valve is open. Either of these constructions of gravity valve is very simple,
requires no spring, and it has no parts liable to get out of order. In some instances
I omit the valve stem and baffle-disk and mount the valve on a pivot or hinge,
arranging a spring to press it away from its seat.
In order to prevent the clogging of the trap-valve by impurities, 1 place a
strainer within the coupling head through which the steam or condensed water must
pass before reaching the valve. This strainer consists of a hollow cylinder of
perforated sheet metal or of wire gauze placed within a suitable cylindrical socket
in the coupling head so that the steam passage through the head passes through it,
and an annular chamber is formed around it communicating with the trap. By this
means a much greater area of strainer surface is attained than would be otherwise
possible, so that the openings may be made very small.
My improved drainage trap may be applied to other parts of the steam-heating
system, as for example it may be applied to drain off the water of condensation from
the steam radiators, or from catch-pockets or sediment wells for separating the
water of condensation from the main or branch steam-pipes. In my system 1
provide the main steam-pipe extending through the train with one or more con-
densation water separators or sediment wells to each carriage, each such separator
or well being provided with one of my improved traps, in order that whenever the
steam pressure is turned off these traps shall open and allow the accumulated
condensed water to run off. For use in such separators or wells, I prefer to provide
the trap with a strainer consisting of a cap or thimble of perforated sheet metal
fastened over the inner end of the body of the trap so as to enclose the valve
thereof.
كيم
1
1001
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.
COMPLETE SPECIFICATION.
Improvements in Pipe Couplings and Traps for the Steam Heating
and Air Brake Systems of Railway Vehicles.
I, EDWARD ETHEL GOLD, of 107 West 95th Street, in the City, County and
State of New York, United States of America, Manufacturer, 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:—
This invention relates in part to couplings for joining together flexible or articu-
lated pipes or hose, being especially designed for coupling the terminal length; of

page_text: hose applied to the steam-heating or air-brake pipes of railway carriages. My
improved coupler is of that general class wherein the coupling heads have ports or
seats at their ends and are coupled together end to end so that the steam passage
is not diverted laterally, the heads being provided with reciprocally engaging
locking projections which wedge together by a downward movement so that the
weight of the coupling tends to hold them in engagement. My invention provides
certain improvements applicable chiefly to couplings of this class, although
applicable also in part to other types of couplings.
My invention also in part relates to steam traps or trap-valves for draining off
water of condensation from the couplings and pipes of heating systems of railway
vehicles. My improved trap is a dynamic or pressure trap, its valve being
constructed to open outwardly so that it is closed and held to its seat by internal
pressure, but when the pressure is turned off it opens automatically and drains out
any accumulated water of condensation. My invention provides an improved
construction of such valves applicable particularly to steam-pipe couplings, as well
as to other parts of the steam-piping of railway carriages.
The preferred construction of couplings and traps according to my invention is
illustrated in the accompanying drawings, wherein
Fig. 1 is a side elevation of a pair of couplings coupled together;
Fig. 2 is a side elevation of the couplings on a larger scale showing them in
the act of being coupled, one of the coupling heads being partially in vertical
mid-section;
Fig. 3 is a plan of the couplings showing them coupled, the coupling heads being
partially broken away and in horizontal mid-section;
Fig. 4 is an end elevation of one of the coupling heads;
Fig. 5 is a transverse section through the head and trap, cut on the line 5-5 in
Fig. 3, and showing the trap-valve closed by an internal pressure;
Fig. 6 is a similar section of the trap removed showing the valve open ;
Fig. 7 is a similar section of a modified construction of trap;
Fig. 8 is a rear view of the trap shown in Fig. 7;
Fig. 9 is a section showing a modification of the trap shown in Fig. 6;
Fig. 10 is a vertical section of a steam separator or sediment well and the trap
applied thereto;
Fig 11 is a transverse section in the same plane as Fig. i showing a modification
of the trap.
I will now proceed to more particularly describe my improved pipe and hose
coupling, and the application of my improved trap thereto. The coupling comprises
two coupling heads or sections B B having ports or seats at their meeting ends,
formed with a steam passage through them, and provided at their opposite ends
with suitable means for attachment to the respective lengths or sections of
hose A A (or flexible or articulated pipe as the case may be) that are to be coupled
or joined together, this hose connection being ordinarily a tubular neck or shank b
entering the hose and fastened to it by an external clamp or ring a. The coupling
heads are preferably in the form of blocks or cylinders fitting together at their
ends, each head being provided with a projecting seat or seating face C so arranged
that as the heads are locked together these seats are forced into firm contact to
make a tight joint with one another. The heads are provided with reciprocally
engaging locking projections cousisting preferably of a lug or disk-like projection c
on one side of the head, and a locking arm projecting forward from the other
side and carrying at its outer end a hooked projectione having a cam-shaped or
eccentric locking face adapted to engage the projection con the side of the opposite
head. This projection c is formed as a wheel or roller mounted on a pivotal stud f
projecting from the side of the head. The hooked projection has its locking
face of such shape that in engaging with the side of the projection or roller o it
forms a tight wedging engagement therewith which presses the two heads firmly
together. The heads are coupled by being put together in an upward oblique
position, as shown in Fig. 2, and then moved downward with a rocking movement

page_text: which wedges their locking projections firmly together and forces their seating
faces CC into tight contact.
To ensure the correct abutment of the heads and bring their seating faces into
exact coincidence, the heads are formed with guides which project from their
meeting ends and by their mutual engagement bring the seating faces into exact
coincidence and hold them against displacement. These guides consist of a projecting
pin or male guide g on each head on one side of the seat, and a female guide or
socket on each head on the opposite side of the seat, so that in coming together
the male guide on each head enters the opposite female guide on the other. The
female guides are formed as projecting bosses with flat outer faces sufficiently
extended to avoid injury to the seating faces in case of contact therewith, the
sockets formed in these bosses extending backward and being made bottomless by
branching laterally, so that any dirt which may enter the socket will find its way
out through the side opening. Both the male and female guides project a distance
less than twice the projection of the seating faces, in order that they shall not
interfere with the intercoupling of the head to which they are applied with a
similar coupling head uuprovided with such guides. Thus a carriage provided
with my improved coupling may have its steam-heating or air-brake pipes readily
coupled with those of another carriage having couplings of the same general type
constructed as has heretofore been usual.
An important feature of my invention consists in the construction of the seats C C
as compensating seats. To this end I form them as rings or gaskets of suitable
shape having flat outer seating faces and convex rear faces, the latter being fitted
into concave sockets of corresponding shape formed in the ends of the coupling
heads. The convex rear faces of the seats are formed either as segments of spheres
or as segments of cylinders. If formed as segments of spheres they are capable of
tilting in any direction and thereby affording a universal compensation which
ensures that the seating faces shall make a steam or airtight joint with one another
notwithstanding any degree of wear to which they may have been ordinarily
subjected. If made as segments of cylinders, the seats will compensate in one
direction only. For a coupling of the type already described wherein the seating
faces are joined by a rocking movement in coupling, and wherein consequently the
wear upon the seating faces is chiefly at the lower sides thereof, it is sufficient to
make the seats as segments of cylinders, the axis of the cylinders being horizontal,
and this form presents certain advantages as applied to such couplers.
For general purposes, however, it is preferable to construct the seats as segments
of spheres fitted into segmento-spherical sockets in the ends of the heads, whereby
each seat constitutes in effect a ball-and-socket joint affording compensation for
wear in all directions. When the two seats come together, if their flat outer faces
are not perfectly parallel, one or both of the seats will oscillate in its socket
sufficiently to bring the two seating faces into the same plane. In order that the
seats shall form a steam or airtight joint not only with the face of the opposite
seat but with the socket in the head, it is either formed of rigid material and
ground to a true fit, or preferably is moulded of a sufficiently yielding composition.
In the latter case, in order to prevent the compression of the seat and the contrac-
tion of the steam port or opening through it, the composition is formed around a
metallic thimble i, having an inner flange against which the inner end of the
composition seat rests. To limit the tilting movement of the seat, it is formed with
two projections or fingers jjat top and bottom, held within notches k k formed in
the socket, by striking against which notches the fingers serve as stops.
To hold the seat in place and prevent its dropping out of the socket, I provide
by preference a spring-clip pivotally engaging the seat and having an elastic
engagement with the interior of the head. This clip D is preferably formed of
wire with its ends turned outwardly and entering pivotal holes in the opposite
sides of the seat, and extending thence backwardly and curving outwardly within
the head, so that the sides of the wire spring into notches m m in the sides of
the head so as to form a strong frictional engagement therewith, and by reason

page_text: of the elastic outward pressure thereagainst, tending to move inward within the
head and thereby holding the seat drawn firmly back into its socket. The wire
may be notched to form abrupt faces which make a positive engagement with
the inner shoulder of the head, the notches m m being either omitted or made
with abrupt faces. The clip D is formed with a reverse loup at the middle, so
that by inserting a hook through the seat engaging this loop and then pulling
forward, the clip is contracted laterally and the clip and seat are drawn outward
until disengaged, so that the seat may be readily examined or a new seat substituted
for an injured or defective one.
"
Each coupling head is by preference provided back of the seat and locking
projections with a lateral opening p in which is applied my improved drainage
trap. This trap E is best constructed with a screw plug or body 9 having preferably
a hexagonal projecting head by which to screw it in or out, formed with an opening
through the body and provided with a self-seating gravity-valves at the inner side
of the body. This valve consists of a tilting disk seating against the seat s'
formed on the inner end of the body or plug. The valve is fixed on a stem {
which passes through the hole r and has mounted on its outer end an impact or
baffle-disk u preferably arranged within a protecting chamber & formed in the
hexagonal head. The disk is kept in central position on the seat a' by the stem t
nearly filling the inner end of the hole, which is conical. The baffle-disk u and
outer end of the stem serve as a counterweight to throw open the valves by
tilting it on its seat. In this position the water of condensation drains out of
the coupling head or other part of the system to which the trap is applied. When
the steam or compressed air is turned on the pressure closes the valve, or if it
fails to do so, the jet of escaping steam or air impinging against the baffle-disk
will throw the latter outward and thereby close the valve. The inner end or
seating faces of the plug 9 may be made vertical, as shown in Fig. 9, or it can
be inclined, so that as the valve seats it will be thrown diagonally upward, as
shown in Fig. 5, thereby affording a larger area of opening when the valve is
open (see Fig. 6). Either of these constructions of gravity valve is very simple,
requires no spring, and has no parts liable to get out of order.
In some instances I omit the valve-stem and baffle-disk and mount the valve on a
pivot or hinge, as shown in Figs. 7 and 8, arranging a spring w to press the valve♪
away from its seat s².
In order to prevent the clogging of the trap valve by impurities, I place a
strainer within the coupling head through which the steam or condensed water must
pass before reaching the valve. This strainer consists of a hollow cylinder of
perforated sheet metal or of wire gauze placed within a suitable cylindrical socket
in the coupling head so that the steam passage through the head extends through it,
and an annular chamber is formed around it communicating with the trap. By this
means a much greater area of strainer surface is attained than would be otherwise
possible, so that the openings may be made very small.
My improved drainage trap may be applied to other parts of the steam-heating
system, as for example it may be applied to drain off the water of condensation from
the steam radiators, or from catch-pockets or sediment wells for separating the
water of condensation from the main or branch steam-pipes. In my system I
provide the main steam-pipe extending through the train with one or more con-
densation water separators or sediment wells such as is shown in Fig. 10 to each
carriage, each such separator or well being provided with one of my improved
traps, in order that whenever the steam pressure is turned off these traps shall open
and allow the accumulated condensed water to run off. For use in such separators
or wells, 1 prefer to provide the trap with a strainer consisting of a cap or thimble v
of perforated sheet metal fastened over the inner end of the body of the trap so as
to enclose the valve thereof.
It is not strictly necessary that the trap be formed with a lateral opening from the
coupling head or other part to which it is applied and its valve be made to close
against a substantially vertical seat, although this construction is preferable. That

page_text: which is believed to be characteristic of this feature of my invention, is that the
valve-stem projecting rigidly from the valve shall extend in such direction that its
weight (or that of a disk or other counterweight hung on it) shall have its center
of gravity sufficiently to one side of the contact of the valve with its sent to over-
come the weight of the valve and impart to it a tendency to open by tilting on its
seat; thus the edge on which it tilts constitutes a rocking fulcrum for it. By
this means the construction is rendered very simple and the use of a spring is
avoided.
In the construction shown in Fig. 11, the trap is made to be attached to the under
side of the coupling head or other part. The hole or opening through the body of
the trap extends first downwardly and then is diverted laterally, so that it
discharges the steam and condensed water in horizontal direction, an the valve-
stem is likewise bent laterally and carries on its end the counterweighting baffle-
disk u, the weight of which when the pressure is removed causes the valve to tilt
upon its seat to the position shown. Upon turning on pressure, the steam escaping
through the valve not only tends to press the valve to its seat, but by its
impingement upon the baffle-disk throws the latter outwardly and thereby seats
the valve.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A pipe coupling consisting of a coupling head or section provided with
a rocking seat consisting of a segment of a sphere or of a cylinder fitting in a
concave socket in said head, and provided with a fastening pivotally connected to
the seat to hold it in place in said socket while permitting it to execute a rocking
movement, essentially as described.
2. A pipe coupling consisting of a coupling head or section provided with a
rocking seat consisting of a segment of a sphere or of a cylinder fitting in a
concave socket in said head, and provided with a spring fastening engaging said seat
and formed to make elastic engagement with the interior of the head, whereby it
holds the seat in place in the socket but is adapted to yield sufficiently to enable
it to be withdrawn to remove the seat, essentially as described.
3. The combination with a pipe coupling head and a tilting or compensating seat
therefor movable in a socket therein, of a fastener for retaining the seat in place
constructed with pivotal ends engaging the seat and outwardly springing portions
engaging the interior of the head, essentially as described.
4. The combination with a pipe coupling head and a tilting or compensating
seat therefor movable in a socket therein, reciprocally engaging stops on the seat
and head to limit the tilting movement of the seat, and an elastic fastener
engaging the seat and head to hold the seat in place in said socket, essentially as
described.
5. The combination with a pipe coupling head and a seat therefor consisting
of a segment of a sphere fitting in a socket in said head, notches formed in the
head, and projections on said seat entering said notches to prevent the rotative
displacement of the seat, essentially as described.
6. A seat for a pipe coupling consisting of a ring of yielding material formed
externally as a segment of a sphere, having a central opening, and a flat seating face
on one side around said opening, and a thimble or sleeve of rigid material within
said ring lining said opening and preventing the inward expansion of the ring,
essentially as described.
7. In a pipe coupling, reciprocal coupling heads having locking projections
for coupling them together, and projecting seats at their abutting ends, and
reciprocally interengaging male and female guides y and h projecting from the
end faces of the heads on opposite sides of the seats to an extent not exceeding
twice the projection of the seats, whereby the guides engage during the act of
coupling and direct and retain the seats and locking projections in proper

page_text: relative positions, while the projecting guides do not interfere with the coupling
of either head to a similar head devoid of such guides, essentially as described.
8. In a pipe coupling, a coupling head having a projecting seat at its end, and
locking projections, and formed with male and female guides g and hon opposite
sides of said seat, the female guide h being formed as a laterally branched bore or
passage in the body of the head, its lateral branch opening at the side of the head
to discharge any dirt that may enter it, essentially as described.
9. In a pipe coupling, the combination of a coupling head having a direct longi-
tudinal passage through it terminating in a seat at its end, a rigid locking arm on
one side projecting beyond the plane of the seat, and having a flanged wedging or
eccentric locking face on its end, and a locking projection on the other side
consisting of a pivotal roller or wheel c mounted on a horizontal axis, and
having a flange on its outer side, whereby in the act of coupling or uncoupling,
said roller by rotating against the wedging face on the locking arm of the opposite
coupling head with which it engages, reduces the friction and wear, essentially as
described.
10. In a pipe coupling, the coupling head having an end seat and locking
projections, and a lateral opening back of said projections, combined with an
automatic drainage trap applied in said lateral opening adapted to open upon the
cessation of internal pressure and thereby to drain off the condensed water within
the coupling, essentially as described.
11. In a pipe coupling having an end seat and locking projections, and a drainage
opening back of said projections, a strainer consisting of a foraminous tube open at
both ends, and arranged within the coupling head with the steam passage extending
through it, and with an annular chamber outside of it, and an automatic drainage
trap applied to the coupling head and communicating with said annular chamber,
essentially as described.
12. A steam drainage trap for railway steam heating systems consisting of a
body portion having an opening through it, and formed with a seat, combined with
a valve arranged to close outwardly against said seat under an internal steam
pressure, and a counterweighted stem attached to said valve and projecting laterally
therefrom with its centre of gravity arranged sufficiently to one side to impart to
the valve a tendency to open by tilting on its seat, whereby upon being relieved of
pressure it automatically tilts open and drains out the water of condensation,
essentially as described.
13. A steam drainage trap for railway steam heating systems consisting of a body
portion having an opening through it, and formed with a seat at its inner end,
combined with a valve arranged to close outwardly against said seat, and having a
stem passing through said opening, and a baffle-disk mounted on said stem in the
path of an issuing current of steam, whereby the weight of said disk and stem
imparts to the valve a tendency to open, while the impact of steam against the
disk contributes a tendency to close the valve, essentially as described.
14. A steam drainage trap for railway steam heating systems consisting of a body
portion having an opening through it discharging laterally, made tapering and
smaller at the inner end of said body, a valve arranged to close outwardly against
said seat, and having a stem passing through said opening and nearly filling the
smaller end thereof, whereby it guides the valve relatively to the seat, and said stem
projecting rigidly from the valve and in lateral direction, so that by its weight it
acts to tilt the valve on its seat and open it upon the cessation of internal
against it, essentially as described.
pressure
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.