Heated Fluid for Heating and owner rurposes.
Year: 1888

page_text: Heated Fluid for Heating and owner rurposes.
A communication from abroad by THE NATIONAL HEATING COMPANY, of the City,
County, and State of New York, United States of America.
I, CHARLES AUBREY DAY, Fellow of the Institute of Patent Agents, of 321, High
Holborn, in the County of Middlesex, do hereby declare the nature of the said Inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:
This invention is an improvement in central station heating systems and consists in
the construction, combination and arrangement of parts hereinafter described and
claimed. The principle involved is that of the Prall system of Central Station Heating
wherein heat for warming, cooking and power purposes is supplied to large districts of
buildings, by means of superheated water, or other circulating agents, conveyed
through underground mains, supply pipes, etc., the circulation being maintained by
force pumps or other equivalent means.
In the following description, reference is to be had to the accompanying drawings
forming part of this specification, in which similar letters of reference designate like
parts throughout the several views.
Fig. 1, is a general perspective view of an apparatus involving our improvements.
Fig. 2, is a perspective view of the house connection, the casing for the valves,
joints, etc., being broken away.
Fig. 3, is a central vertical section of the house supply pipe, valves, etc., taken on
the line, x, of figure 2.
Fig. 4, is a central vertical section of one form of converter and pressure regulator,
the plane of the section passing through the centre of the supply pipe.
Fig. 5, is a central, longitudinal, vertical section of an expansion joint and ball
valve.
Fig. 5 a, is a cross section through the valve and valve chamber shown in figure 5.
A

page_text: Fig. 6, is a transverse section on the line y, y, figure 5.
Fig. 7, is a vertical longitudinal section of a combined expansion and branch main
joint or coupling.
Fig. 8, is a transverse vertical section of the underground conduit, the supply and
return mains, the bracket which supports the mains, and showing also other features
of construction. The plane of the section being that of the line z, z, figure 1.
Fig. 9, and 10, are central vertical sections of modified forms of converter and
pressure regulator.
Referring to figure 1, A, is the heater or boiler where the water is superheated,
and C, C, the supply main leading from the heater at C, and returning to the same
at C A force pump B, is provided for the purpose of keeping up a circulation in
the supply main, which extends through one street and returns usually through another
and is connected with the heater at both ends, whereby a closed circuit is formed and
the circulation made continuous.
The heater should be of sufficient capacity to furnish all the water necessary to
supply heat, for any purpose whatever, to the district reached by the circulating main.
The heater may be supplied by means of a force pump connected with the ordinary
water main of the street, or in any other desirable way, with water in such quantities
as may be desired to supply the place of that taken from the main C, for any purpose
or by any means whatever. The power for driving the pumping engine may be taken
from steam generated in the heater, or from a boiler erected for the purpose.
It is
evident that there may be several heaters employed for the purpose of supplying
water for circulation and thoy may all be connected, or they may be separated by
means of cocks placed in the connecting pipes so that one or more of them may be
used independently of the others.
The hot water mains are to be covered with a considerable thickness of some non-
conducting substance, such as asbestos, wool and paper, or other non-heat-conducting
material, and are enclosed in a strong, water-tight rectangular box of wood, or in a
strong hooped, cylindrical box of wood, or a brick or stone conduit may be employed;
a section of the latter form is shown in figure 8. The essential features of the conduit
are that it have a considerable free space between it and the contained pipe, that it be
water-tight, or as nearly so as possible, and that it be strong enough to sustain a
moderate internal pressure. All these details, however, form no part of the present
invention, which relates to the construction of the expansion joints, the combination,
expansion and branch main couplings and valves, the supports for the supply and
return mains within the conduit, the manner of and means for, connecting the supply
and return mains with the converter within the house or other building to be heated
and other features of construction, relating and pertaining thereto.
In this system of heating the water of condensation, instead of being conducted
from the steam trap into the sewers after it has passed through the radiators and
possesses no further heating power, is conducted back to the heater by means of return
pipes, mains, etc., and being again heated to the required temperature, is again circu-
fated through the supply main for heating purposes. The means for doing this consist
of a return main D, laid parallel with and immediately under the supply main; and
branch return mains and return pipes, which correspond with the branch supply mains
and supply pipes connected with the supply main. Both ends of the return main are
connected with a return water tank D', situated in proximity to the heater, and a force
pump D, is employed for forcing the water from the said tank into the heater. In
construction, protection, etc., the return mains and pipes are in all respects similar to
the supply mains and pipes, the only difference being that the strength of the latter
must necessarily be much greater than that of the former, in order that they may
withstand the much greater pressure to which they are subject in this system because
of the high temperaturo at which the heating medium is circulated.
Having now described the main features of the system we will proceed to set out
the features thereof to which our invention more particularly relates.
The supply and return mains C, and D, are usually placed in an underground
conduit and are connected with the heater and return water tank as shown and

page_text: described; the latter together with the force pumps and other portions of the system
pertaining thereto being located in a building constructed for that purpose.
At suitable points along the lines of the mains, usually at the junction of the streets,
are arranged combination expansion and branch main couplings E, and bracket
supports F, and expansion and automatic valve coupling G, the latter being applied to
the supply mains and pipes only-are placed wherever necessary. The supply mains
are also provided with ordinary gate valves H, as shown and these valves may also be
applied to the branch supply mains and pipes, wherever desired. Flanges or wings
are also formed upon the bottom of the coupler by which it may be bolted or secured
to the base of the conduit.
The construction of the first of these couplings is that shown in Fig. 7. The main body
of the coupling E, is cast in a single piece and is provided with two longitudinal bores E¹,
and E, as shown, with which the supply and return mains respectively connect, and
with two transverse bores or passages with which the branch supply main c, and branch
return mains d, communicate. At one end of this coupling-in this case on the left
of the figure--the mains C, and D, are connected with the coupler in any desired
manner. At the other end, however, each of the bores, E, and E, are enlarged as
shown at e, and e¹; a rib or flange e", separates the enlarged chambers e, and e¹.
Attached to the supply and return mains C, D, aro brass slips or tubes K, and
surrounding these are heads L, which fit within the enlargement e¹, of the main bores
and are provided with flanges L', by means of which the heads may be bolted to the
coupler as shown. A flange L", is also formed on the head I, attached to the supply
main which is somewhat larger than the tube or slip K, and within which is placed a
packing 1, of asbestos or other suitable material. K is a brass ring or wiper provided
with a flange which presses upon the packing 4, and a head or flange by which it is
bolted to the head L. The space or chamber e', is also provided with packing similar
to that at l.
The means by which the branch mains are attached to the coupler are the same as
those above described and their illustration in section and detail description are not
therefore deemed necessary. By this construction the free and easy expansion of
the mains is secured and a perfectly tight joint provided. The object in forming
the slips or tubes K, and the wiper or band K", of brass is to prevent the formation
of rust and to permit of the ready movement of the parts in the expansion and
contraction thereof.
The ball valve shown in figures 5, and 5a, is placed in a circular chamber, as
shown, in the lower part of which are inclined, longitudinal ribs or ways upon which
the valve rests; these ribs are deepest at the centre, and taper gradually to the lower
edge of the pipe openings at each end of the chamber. Each of said openings may
be large enough to admit the valve, and valve seats may be formed upon the end of
each pipe, or the construction may be that shown in figure 5, in which a valve seat
is formed at one side of the chamber and on the end of the main or pipe on the other
side in either case, the valve can be inserted before the pipe is screwed in.
By this construction of chamber and valve, the water or other heating medium is
permitted to flow entirely around the valve, which is so graded in weight as to remain
in the centro of the chamber when the water or other fluid is flowing normally, but
in case of a rupture or other breakage of the main the pressure on the side opposite
the break will be sufficient to throw up the valve and cut off the flow. By allowing
the hot water or other heating medium to flow freely underneath and on all sides
of the valve, the valve chamber is kept clean and the deposition of any and all
substances prevented. This form of valve and coupling may be located wherever
desired along the supply and branch supply mains.
The construction shown in figure 8, involves a bracket M, for holding the mains
in position, means for securing the same to the bottoin of the conduit and means
for admitting of the casy movement of the mains under the process of expansion
and contraction. The conduit shown consists of double brick walls and a concrete
base to which the bracket is bolted. The bracket M, is provided with a cap M³,
and between the bottom or main portion and the cap M, is formed a circular

page_text: Space or opening through which the supply main (1, passes and in the bottom of
Said opening is placed a roller m, constructed as shown, upon which the main rests.
The lower part of said bracket is also open, the upper part of the opening being
circular in form and through this opening passes the return main D. The bracket
is also provided with bottom flanges or wings by which it is bolted to the bottom
of conduit, metal plates being placed beneath or in the concrete substance forming
said bottom for this purpose, and vertical side ribs or flanges which add strength
thereto. A plate m¹¹, is also bolted to the concrete bottom of the conduit within
the sides of the bracket M, and this plate is provided with vertical notched lugs
which support a second roller m', upon which the return main D, rests. The central
portion of the plate m", is cut away to admit of the movement of the roller m².
Arranged centrally along the bottom of the conduit is a channel for carrying off
any water that may collect therein. This channel may be connected by means of
pipes with the street sewer. Of course the conduits, supports, branch connec
tions, etc., for the branch mains are the same as those berein before described and the
branch mains after passing through the district to be heated are returned to and
connected with the mains in the same manner.
111
,
Having now described the general features of the system and the details thereof
relating to the underground street mains, branch maius and their connection with
each other, we will now point out and describe the means by which the superheated
water is conducted from the supply main into the house, converted into steam, when
steam is used as a heating medium, and the water of condensation returned to the
return main.
For this purpose a supply box or housing N, preferably of metal and of the general
form shown either in figure 1, or 2, is placed in a space prepared therefor beneath the
pavement and usually in such a position that two houses may be supplied by branch
pipes leading therefrom. Within this box or housing are brackets or ways n³, which
may be formed either on the sides or back of the housing, or attached thereto in any
desirable way. The sides of the housing are provided with longitudinal slots N,
and N, as shown; in the bottom thereof is placed a block N, which is preferably
provided with a horizontally concaved upper surface. A plate n¹¹, rests upon the
ways n, and is also provided with a horizontally concaved upper surface.
A supply
pipe c, extends from the main C, and a return pipe d, from the return main D.
Attached to the inner end of pipe c', is a T, connection c", which is convex on its
under surface and rests upon the horizontally concaved surface of plate n". The
pipe d', is also provided with a T, connection 1, which is also provided with a convex
surface on its lower side.
House supply pipes O, connect with head c", as shown in figures 2, and 3, and each
is provided with an asbestos or other suitable cock 01, in order that the supply from
either or both may be cut off when desired. Return pipes P, connect with the head d",
in the usual way.
By this construction a free movement of the heads c¹¹, and d", forward and back
and laterally is provided for and the slots N¹, and N", also admit of the movement
of the pipes O, and P, in the sides of the box or housing N. The pipes c', and d',
and O, and P, will usually be quite short and by means of the construction shown,
ample provision is made for their expansion and contraction. Of course expansion
joints similar to those herein described may be placed in each if desired.
The means for utilizing the superheated water, for heating purposes, within the
building consist of a converter, an automatic differential pressure regulator, steam and
water pipes, radiators, a meter and a tank to receive the water of condensation from
which it is returned to the return main.
The converter and regulator is shown at 01, in figure 1, and in central vertical section
in figure 4. As shown in figure 4, the regulator consists of a casting R, having a cap
bolted thereto and is itself secured to the converter R, which in this case consists of
a chamber cast in a single picce with an opening in the top for the admission of water
and an opening r, in the side, at which point the steam pipe », leading to the radiators
is attached.

page_text: The casting R, is provided with a enlarged chamber R", in the top thereof, the
bottom of which is hollowed out forming an auxiliary chamber 01, which communi-
cates by means of a passage o, with a chamber 01. This chamber has an open
bottom and a side passage with which the supply pipe 0, communicates. The opening
in the bottom of chamber 01, is closed by a head or nut o', which is provided with a
screw o Arranged within the chamber R. is a diaphragm R, and upon or above
this diaphragm is placed a convexo-concave disk S, which is provided with an opening
in the centre thereof. This disk is provided with an upwardly projecting lug S¹, to
which is pivoted a lever S", provided with a weight S. Arranged within the
chamber, is a valve s, provided with a valve stem s¹, which passes through the
centre of the diaphragm R, and is secured thereto by an upper and lower nut as
shown. The lever s", rests upon the upper end of this valve stem to which it may be
movably secured in any desired manner. The purpose of the screw ol, is to properly
locate the valves. The diaphragm R11, is made of metal, preferably of brass, and is
capable of vertical movement.
By providing the chamber R₁, and having a removable top attached thereto, the
weighted lever and other elements of construction connectod therewith are securely
protected and the danger resulting from the bursting of the diaphragm and its
inclosing plate, if the same occur, is avoided.
The operation is as follows: The heater A, being filled with water and heated to a
high degree-for example say 332° Fahrenheit, which would give a pressure of about
100 pounds to the square inch-and be kept at that point, which would be 120°
above the steam generating point, and if the connection at both ends of the supply
main be open, the pressure upon said main and tho water therein will be the same as
upon the water in the heater; and if the force pump be put in motion, the water will
be forced through the main at about a temperature equal to that in the heater. If
now the cocks in the supply pipe be opened the hot water under pressure will be
forced through the supply pipe into the chamber 01, and will rise in said chamber
and How therefrom through the passage T, into the converter R, where it will
instantly expand into steam because of the great reduction of pressure, as it contains
many degrees of heat above the steam generating point as above mentioned. Suppose
now it is desired to employ the steam for heating purposes at a pressure of say
15 pounds to the square inchi. The weight S, on the lever S", is, in this instance,
so placed as to admit of 15 pounds pressure upon the diaphragm 1, before the same
will be moved by the pressure of the steam in the converter R¹. As soon, however,
as the pressure of the steam in the converter is greater than 15 pounds to the square
iuch, the diaphragm will raise the valve stem and valve against the prossure of the
weighted lever and the valve will cut off the flow of hot water into the chamber Q",
and converter R¹. As soon, however, as enough of the steam has escaped into tho
steam pipe to reduce the pressure in the converter below 15 pounds, the weighted
lever will operate to open the valve s, and admit the water to the converter, when it
is converted into steani and the operation above described is repeated as long as the
cocks in the supply pipes are open. The steam is conducted by means of a pipe »,
to the radiators for heating purposes, and the water of condensation returned through
pipe P, to the return water tank P, from which it is conveyed to the return main
by means of pipes P, and c', and thence through the return main to the tank D', from
which it is pumped into the heater A, by pump D", where it is again raised to the
required temperature and again circulated through the supply main C. If because
of the irregular surface of the street in any particular plant or system, the difference
in the temperature of the circulating medium in the supply and return mains will not
cause a circulation in the latter, or cause the water therein to return to the heater,
force pumps may be applied to the return main at any point desired.
For the purpose of determining the exact amount of heat consumed by cach
customer, we employ any well known water meter U, with which the return water
pipe communicates after leaving the tank P. The condense water discharged through
this pipe and meter will always bear the same unvarying relation to the amount of

page_text: steam produced in the converter R', under a given pressure and it will thus be an
easy matter to calculate thereby the number of cubic feet of steam or units of heat
consumed.
In figures 9, and 10, we have shown modified forms of converters and regulators.
In figure 9, the converter R¹, is surrounded by a hot water chamber V, into which the
water enters from the branch supply pipe O from this chamber the water passes by
means of a pipe V, into the chauber 01. Instead of a diaphragm we employ a
double elastic piston R", which is convexo-convex in form, and is composed of two
copper plates united as shown, the outer edge of the upper plate being bent upward
and the outer edge of the lower plate being downward, the said bent portion forming
a bearing surface for the piston. A hot water chamber is formed between the
chamber O, and the converter and the stem s', is provided with two valvess, and s¹¹,
as shown. The chamber 01, might evidently be omitted. The operation is as
follows: The superheated water enters the chamber V, passes by means of pipo V,
into chamber O, the valve s", being open and the valves, being closed, the
chambers O, and O", will be filled until the pressure on the piston RT, is sufficient
to raise the valve stem against the force of the weighted lever, when the valve s",
will be closed and the valve s, opened. The water will then pass into the converter
and be converted into steam as in figure 4, which will be conducted by the pipe,
to the radiators. As soon as the water in chamber 01, is vaporized, the weighted
lever will open valve s", and close valves, and the above operation will be repeated.
The size of the piston and the location of the weight on the lever are such that the
pressure of the water alone in chamber O", on the piston can never keep the valve s",
closed. This can only occur when each of the chambers O", and O, are filled
and the pressure of the superheated water operates both upon the piston and
valve s¹¹.
The construction shown in figure 10, is the same as that of figure 4, with the
exception that the converter is partly surrounded with a hot water chamber as in
figure 9, into which the water enters by means of pipe O, and from which it passes to
chamber O, through pipe V. By surrounding the converter with a hot water
chamber as in figures 9, and 10, the temperature of the converter is kept many
degrees above the steam generating point and the rapid and complete evaporation of
the water is thus assured and the condensation thereof prevented. Of course the
water chamber may be applied to the form shown in figure 4, if necessary.
If desired, these hot water chambers may be connected with the supply main by
means of pipe W, the same as in the Prall system referred to, and a complete circuit
between the said chambers and the supply main thus established. The pipe W, is
shown only in figure 9, but it is evident that the same may be applied to the water
chamber V, in figure 10, if deemed necessary.
In addition to supplying steam or hot water for heating and cooking purposes, as
herein shown and described, it is evident that this system may be employed for the
purpose of supplying steam or hot water for power purposes; propoiling street cars,
by charging receiving tanks located thereon, with hot water, at intervals along the
line, stations being provided for that purpose; also running stationary engines for
any and all purposes, wherever an engine may be located in proximity to the
circulating mains and pipes.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed, 1 declare that what
I claim is :-
1. In a heating system the combination of a superheater, a supply main, a force
pump, an expansion joint, or coupling, provided with a double acting check valve,
and means for conducting water from the supply main into a house or other building
and utilizing the same for heating purposes.
2. In a heating system, the combination of a superheater, a supply main, a force
pump, a supply pipe leading from said main, a box or housing, N, a movable coupler

page_text: or T, head attached to said supply pipe and located in said box or housing and branch
pipes leading from said coupler to the buildings to be heated, substantially as shown
and described.
3. In a heating system, the combination of a superheater, a supply main, a force
pump, a supply pipe, a box or housing into which said supply pipe extends, a coupler
attached to said pipe within said housing and a branch pipe or pipes leading from
said coupler into the house or houses to be heated, substantially as shown and
described.
4. In a heating system, the combination of a heater, a supply main, a force pump.
a supply pipe, a housing into which said supply pipe extends, a coupler within said
housing, a branch pipe or pipes attached to said coupler and extonding out of said
housing into a building or buildings to be heated, a regulator and converter, and a
radiator or radiators, substantially as shown and described.
5. In a heating system, the combination with a heater, supply main, and a force
pump, of a box or housing located beneath the sidewalk, said box being provided
with ways or bearings and a block ", resting thereon, a supply pipe extending from
the said main into said housing a coupling attached to said supply pipe and resting
movably upon the block n", and branch supply pipes communicating with said
coupling and extending into the house or houses to be heated, substantially as shown
and described.
6. In a hot water heating system, the combination of a superheater, a supply main,
a force pump, a box or housing provided with side openings N', as shown, a supply
pipe leading from the main into said housing, a coupler and branch supply pipes
leading from said coupler through said openings in the building to be heated,
substantially as shown and described.
7. In a hot water heating system, the combination of a heater, a supply main, a
force pump, a box or housing provided with side openings N1, and ways or brackets n',
as shown, of a block as n", resting on side ways, a coupler resting on said block, a
supply pipe connecting the main and coupler, and branch supply pipes leading from
said coupler into the building or buildings to be heated, through the openings, N',
substantially as shown and described.
S. In a lot water and steam heating system, the combination of a heater, a supply
main, a force pump, a housing N, provided with ways or brackets n', a block 11,
having a longitudinally concaved upper surface, a coupler C, having a convexed
lower surface, resting on said block, a supply pipe connecting the main and coupler
and a branch pipe or pipes leading from the coupler to the building or buildings to be
heated, substantially as shown and described.
9. In a hot water circulating system, the combination of a superheater, a supply
main and force pump, an automatic check valve located in the supply main, a return
main, a return water tank and a pump for forcing the water from the tank into the
heater substantially as shown and described.
10. In a central station heating system, the combination of a heater, a supply and
a return main, a bracket as M, having an upper and lower opening, and a removable
cap and revoluble supports in said openings, whereby the mains are permitted to move
freely in the direction of their lengths, substantially as shown and described.
11. In a central station heating system the combination of a heater, a supply and
a return main, a bracket M, having upper and lower openings, a removable cap for
the upper opening and revoluble supports for the mains in said openings, said bracket
being secured firmly to its support, whereby said mains are held in place and their
free longitudinal movement provided for, substantially as shown and described.
12. In a hot water circulating system, the combination of a superheater, a supply
main, a force pump therefor, a return main, a supply pipe, a box or housing, a
movable coupling within said box, a branch supply pipe leading from said movable
coupling to the house to be heated, a branch return pipe leading from the house to
the side box and provided with a movable coupling therein and a return pipe leading
from said coupling to the return main, substantially as shown and described.
13. In a hot water circulating system, the combination of a superheater, supply

page_text: and return mains, a force pump, supply and return pipes, branch supply and return
pipes and a box or housing within which the supply and return pipes and branch
supply and branch return pipes connect, substantially as shown and described.
14. In a hot water circulating system, the combination of a heater, force pump,
supply and return pipes, a housing within which the supply and return pipes connect
with branch supply and return pipes, a regulator and converter, a radiator or
radiators, a condense-water tank and connecting pipes, substantially as shown and
described.
15. In a hot water circulating system, the combination of a heater, supply and
return mains provided with expansion joints, forco pumps, supply and return pipes,
movable couplings, a housing containing the couplings, branch supply and return
pipes, a regulator and converter and radiators and connecting pipos, substantially as
shown and described.
16. The combination of the heater, the supply and return mains and the branch
supply and branch return mains, a coupler formed in a single piece having two
longitudinal and two transverse bores, and means to permit of the longitudinal
expansion and contraction of the supply mains, substantially as shown and described.
17. The combination of the heater, the supply and return mains, the branch supply
and branch return mains and a coupler formed in a single piece provided with two
longitudinal and two transverse bores, and means to permit of the longitudinal
expansion of the supply and return mains and the brancli supply and branch return
mains, substantially as shown and described.
18. In a hot water and steam heating system the combination with the supply main
of an automatic pressure regulator provided with a steam or converting chamber,
said chambor being surrounded by a hot water chamber, the supply main, hot water
chamber, the regulator and steam or converting chamber being in communication with
cach other, substantially as shown and described.
19. In a hot water heating system, an automatic pressure regulator provided with
a steam or converting chamber, said chamber being partially enclosed by a hot water
chamber, the hot water chamber, regulator and steam or converting chamber being in
communication substantially as shown and described.
20. An automatic differential fluid pressure regulator, consisting of a casing or
casting having an upper chamber provided with an auxiliary chamber 01, a
chamber O, below the auxiliary chamber and separated therefrom by a partition
having a central opening in which is a valve seat, in combination with a piston
provided with the stems, to which is attached the valve s", and a weighted lever S",
substantially as shown and described.
21. An automatic differential fluid pressure regulator consisting of a casing having
upper and lower chambers, an auxiliary chamber formed in the bottom of the upper
chamber and separated from the lower chamber by a perforated partition, in combi-
nation with an clastic piston R, provided with the valved stem s¹, and the weighted
lever S, and a connection between the piston and lever substantially as shown and
described.
22. An automatic differential fluid pressure regulator, consisting of a casing pro-
vided with chambers R", 0, 0, a piston R₁, provided with a valved stom s',
and a weighted lever S, in combination with a converter R, provided with the
chamber R³, and a pipe or passage communicating with the chamber 01, of the
regulator as shown and described.
23. An automatic differential fluid pressure regulator, consisting of a casing having
the chambers R", O", and "", and a removable top, in combination with a piston
situated in chamber Q", provided with the valved stem s', and a weighted lever S",
in chamber R, connected with said piston, substantially as shown and described.
24. In a heating system, the combination of a superheater, a supply main, a force
pump, expansion joints or couplings, a supply pipe, a housing N, branch pipes
leading from said supply pipe to different houses, a converter and regulator with
which the branch supply pipes communicate and a radiator connected with the
converter, substantially as shown and described.

page_text: 25. In a heating system, the combination of a heater, a supply main, a force pump,
a supply pipe leading from the supply main, a movable coupling c, pipes leading
from said coupling to a regulator and converter, a regulator and converter, and
radiators, substantially as shown and described.
26. In a hot water heating system, the combination of a heater, a supply main, a
force pump, a supply pipe, a box or housing constructed as shown and described,
a movable coupler attached to said supply pipe within the housing, a branch pipe
or pipes connected with said coupler a regulator and converter, and a radiator or
radiators, the supply mains and pipes being provided with expansion and movable
joints and couplings as shown and described.
1
ր
2 1000
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.