Improvements in connection with Filter Beds for Filtering Sewage Water or other Liquids.
Year: 1898

page_text: Date of Application, 20th June, 1898
Complete Specification Left, 20th Mar., 1899--Accepted, 22nd Apr., 1899
Date of Application, 20th June, 1898
Complete Specification Left, 20th Mar., 1899--Accepted, 22nd Apr., 1899
IMUVIDIONAL DI MUITIVATION.
Improvements in connection with Filter Beds for Filtering Sewage
Water or other Liquids.
I, ROBERT OWEN WYNNE-ROBERTS of Oswestry in the County of Salop, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to means or mechanism in connection with filter beds for
filtering sewage water or other liquids whereby valves are automatically released
or operated to discharge the filtered water from the filter beds, means also being
provided for automatically altering the course of the liquid to be filtered.
My invention is intended for use in combination with several filter beds arranged near
to one another, the mechanism being arranged so as to effect the filling of the filter beds
with unfiltered water and the discharge of the filtered water from the filter beds one
after another. The filter beds communicate with a chamber, common to all the filter
beds into which chamber the filtered water passes from each filter bed in succession,
the said chamber being provided with valves automatically operated or released by a
tilting vessel (actuated by the filtered water) situated in the said chamber and
connected by gearing with a valve-operating or valve-releasing device. Instead
of a tilting vessel, a hydraulic cylinder and piston may be provided for operating the
valve-releasing or valve-operating device by water from a town main, or elevated
cistern, admitted automatically to the cylinder by the rise of the level of water in
a filter bed to a predetermined height and through gearing connected therewith
release or operate the discharge valve. When the water in any one of the filter
beds reaches a predetermined height may be caused to act on a float or floats so
as to open a valve or cock which will allow a portion of the filtered water to flow
into the tilting vessel and cause the said vessel to tilt or to open a cock connected
with the town main or elevated cistern to allow water to flow into the hydraulic
cylinder so as to raise the piston in the cylinder and transmit movement through
suitable gearing to a valve-releasing, or valve-operating mechanism to discharge the
water from one of the fully charged filter beds. The tilting vessel or the rod of
the hydraulic piston as the case may be may carry a pawl, so that when the vessel
tilts or the piston of the hydraulic cylinder rises, the said pawl will actuate a
ratchet wheel fast on a shaft carrying a toothed wheel in gear with a similar wheel
on another shaft on which is mounted the valve releasing or valve operating device
and also a spout for directing the unfiltered water in the required direction. The
axle on which the tilting vessel turns may be provided with an arm connected to a
pawl for giving motion to a horizontal rachet wheel or notched disc fast on a vertical
shaft carrying a cam which, as the shaft rotates, acts on levers to open and close
the valves which govern the discharge passages from the filter beds. Receptacles
containing floats in number corresponding to the number of filter beds may be
arranged so that when the water in any one of the filter beds rises to a predetermined
height it will enter the corresponding receptacle containing a float so as to raise the
said float and through a counter-weight open a cock which will admit water from
the town main or elevated cistern to a hydraulic cylinder to raise the piston therein
and through the said piston impart motion to a trough for directing the unfiltered

page_text: water into an empty filter bed and at the same time release or open the valve of a
fully charged filter bed to discharge the filtered water therefrom. On the shaft or
spindle carrying the valve releasing or valve operating device is an arm which as the
shaft rotates causes the cock or valve, which had been opened to supply water to
the hydraulic cylinder to close, the exhaust passage from the hydraulic cylinder
being also opened to allow the hydraulic piston to return to its normal position, in
readiness for the next operation by an arm projecting from the lever which imparts
rotation to the spindle carrying the valve-releasing device.
Instead of a movable trough for directing the unfiltered water to the several
filter beds in succession, I may provide a fixed trough into which the unfiltered
liquid is fed, and from which it passes to the several filter beds by passages leading
from the said fixed trough, the passage of the liquid from the trough being
governed by sluice valves operated by bydraulic cylinders and pistons connected to
the said sluice valves.
.
Beneath the fixed trough are receptacles for water, each receptacle being provided
with a float and in the bottom of each receptacle is a pipe communicating with a
valve box containing valves for governing the discharge of filtered water from the
corresponding filter beds. As the water in a filter bed rises it also rises in the pipe
leading to the corresponding receptacle containing the float and when the liquid bas
risen to a predetermined height the float causes a tap to open which allows the
pressure of water from the town main or from an elevated cistern to open the sluice
valve in connection with an empty filter bed for admitting unfiltered water to the
said filter bed and at the same time a discharge valve of a fully charged filter bed is
released to discharge the filtered water therefrom.
The inlet valves operated by hydraulic pressure each consist of a cylinder, piston
block, hollow piston rod, and sliding door, and the discharge valves may each consist
of a cylinder, disc, cone, piston block, and hollow piston rod. The hollow piston
rods and blocks are stationary, whilst the cylinders, discs, cones and doors are
moveable.
When the tap hereinbefore described is opened by the rising of the float the
water from the town main or elevated cistern or other source of supply flows
through the hollow piston rod into the cylinder above the piston blocks, fills the
space, and causes the cylinder and parts connected thereto to rise, and allows the
filtered water, from the filter bed in connection therewith, to discharge and also
the unfiltered water from the stationary trough to flow onto the next filter bed to be
brought into operation, the float being retained in its elevated position by a catch
until released by the rising of the float in connection with another of the filter
beds. When the float is released it falls to the bottom of the receptacle and by
means of a chain or equivalent connection opens a cock to discharge the water
from the cylinder of the outlet valve of the next filter bed to be filled, and allow
the disc, cone, and piston block in connection with the said cylinder to return to
the normal position.
When any filter bed requires to be rendered inoperative a tap in the pipe leading
to the cylinder in connection with the outlet valve of this filter bed is closed, and
a tap opened to bring the outlet valve in the next valve box into operation, the
valve which governs the supply of unfiltered water to the said filter bed which is to
be thrown out of action being also closed and the valve for supplying unfiltered
liquid to the bed which is to be worked in its place opened. A three-way cock in
the passage leading from the discharge valve box connected to the filter bed
rendered inoperative to the receptacle containing the float in connection with this
filter bed also turned so as to shut off the liquid from the float receptacle in
connection with this said filter bed and to conduct the liquid to the float receptacle
in connection with the filter bed to be brought into operation.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.

page_text: Improvements in connection with Filter Beds for Filtering Sewage
Water or other Liquids.
I, ROBERT OWEN WYNNE-ROBERTS, of Oswestry, in the County of Salop, Engineer,
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:-
My invention relates to means or mechanism in connection with filter beds for
filtering sewage water or other liquids whereby valves are automatically released or
operated to discharge the filtered water from the filter beds, means also being
provided for automatically altering the course of the liquid to be filtered.
the
My invention is intended for use in combination with several filter beds arranged
near to one another, the mechanism being arranged so
as to effect
filling of the filter beds with unfiltered water and the discharge of
the filtered water from the filter beds one after another. The filter beds
communicate with a chainber common to all the filter beds into which chamber
the filtered water passes from each filter bed in succession, the said chamber
being provided with valves automatically operated or released by a tilting vessel
(actuated by the filtered water) situated in the said chamber and connected by
gearing with a valve-operating or valve releasing device. Instead of a tilting vessel
a hydraulic cylinder and piston may be provided for operating the valve-releasing
or valve-operating device. The said hydraulic cylinder may be supplied with
water, from a town main, or from an elevated cistern and admitted automatically to
the cylinder by the rise of the level of water in a filter bed to a predetermined
height and through gearing connected therewith, release or operate the discharge
valves. When the water in any one of the filter beds reaches a predetermined
height it may be caused to act on a float or floats so as to open a valve or cock
which will allow a portion of the filtered water to flow into the tilting vessel and
cause the said vessel to tilt and operate the valve mechanism, or to open a cock
connected with the town main or elevated cistern to allow water to flow into the
hydraulic cylinder so as to raise the piston in the cylinder and transmit movement
through suitable gearing to the valve-releasing or valve-operating mechanisin to
discharge the water from one of the fully charged filter beds. The tilting vessel or
the rod of the hydraulic piston, as the case may be, may carry a pawl so that when
the vessel tilts or the piston of the hydraulic cylinder rises, the said pawl will
actuate a ratchet wheel on a shaft or spindle and through a cam open a discharge
valve.
I will describe my invention with reference to the accompanying drawings of
which Figure 1 shews in vertical section and Figure 2 in horizontal section on
the lines x and y y a valve chamber provided with a tilting vessel and valve-
operating mechanism constructed and arranged according to my invention. Figure
is a vertical section and Figure 4 a horizontal section, on the lines w-w and z-z
Figure 3, illustrating an arrangement for operating the valves by means of hydraulic
cylinders and pistons. Figure 5 is a part plan and part horizontal section of another
modification, and Figure 6 is a developed view of the valve chamber thereof.
Referring to Figures 1 and 2, A are pipes or passages communicating with filter
beds, which are not shewn in the drawings, A2 are other passages in connection with
a channel A³ communicating with an additional filter bed which can be brought into
action when either of the other filter beds require to be cleaned or placed out of
action. The passages A A2 are each provided with a valve B B₁ which valves
control the passage of the filtered water from the filter beds into a pipe or passage C
leading to a water-course, reservoir or other place. The mechanism by which the

page_text: valves are operated is contained in a chamber D which for compactness is constructed
of cast iron as shewn but which if desired may be built of brickwork or the like.
Mounted on a horizontal shaft E in the chamber D is a tilting vessel or trough F
into which, filtered water from the filter beds enters to cause the said vessel to tilt
and operate mechanism by which the valves are opened to allow the filtered water
to flow from the filter beds as hereinafter described. Extending upwards from
each passage A A2 is a pipe a opening into a chamber or cistern a² in the bottom of
which is an opening closed by a float valve b the said openings being provided with
cocks 62 for governing the passage of water from the cisterns into an annular
trough c supported in any suitable manner in the interior of the chamber D, from
which trough the water flows by a lip 2 into the tilting vessel F. On the axle E
of this tilting vessel is an arm d connected by a rod d¹ to a weighted arm d² fitted
to turn on a vertical shaft or spindle G which is mounted in a foot-step bearing e on
the bottom of the chamber D. The cocks b2 are normally maintained closed by
springs 6x and are opened one after another by an arm G¹ on the vertical spindle G
coming into contact, as the spindle rotates, with a lever G2 on the plug of each cock.
The weighted arm d² carries a pawl d³ which engages the teeth of a ratchet
wheel d so that by the tilting of the vessel F intermittent motions of partial rotation
are imparted to the vertical spindle G. On the upper
end of this
vertical spindle is a trough H into which the sewage or liquid to
be filtered is fed and by which the said sewage or liquid is conducted into channels
leading to the several filter beds. On the said spindle G is also fixed a catu faced
disc which at each intermittent partial rotation of the spindle acts on one of the
levers B2 to which the valves B B are connected so as to open one of the said
valves. The water to be filtered is conducted by the trough H into each filter bed
in succession and as water rises in a filter bed, the filtered water passing there-
through enters the corresponding pipe or passage A, the valve B in the said passage
being maintained closed by the pressure of the water. As the level of the water
rises in the filter bed the filtered water will rise to a corresponding level in the
pipe a connecting the said passage A with the corresponding chamber or cistern a²
and when the water rises to a certain predetermined height the float in the cistern a²
will rise and lift the valve b and allow the water to pass from the cistern through
the spout and cock 62, which in the meantime has been opened by the arm G¹, into
the annular trough cand from the said trough into the tilting vessel F which when the
water accumulates sufficiently therein will tilt and impart motion of partial rotation
through the pawl d³ and ratchet wheel d to the vertical spindle G the tilting vessel
being then returned to its normal position by a counter balance weight f. By the
partial rotation of the vertical shaft or spindle G as described the cam I is caused to
act on the lever B2 of one of the valves B so as to open the valve and so discharge
the water from the filter bed. By the same partial rotation of the said spindle the
trough H is moved into position to conduct unfiltered water into the next filter bed of
the series. The water discharged from the tilting vessel F falls to the bottom of
the chamber D and passes away with the filtered water from the filter bed past the
valve B into the passage C leading to a water-course reservoir or other place. The
filtered water from the next filter bed will in like manner enter the passage A in
connection therewith and rise in the pipe a into the corresponding cistern a² raise
the valve b in the said cistern to allow the water to pass into the annular trough C
and thence into the tilting vessel F which is thus caused to tilt and impart a further
motion of partial rotation to the vertical spindle G together with the cam I and
trough H thereby opening the valve B of the next filter bed to discharge the filtered
water from the said filter bed the trough H at the same time moving into position
to charge with unfiltered water the next filter bed of the series. The same operation
takes place with each filter bed of the series in succession. The cam I is suitably
shaped to maintain two or more of the valves B of the filter beds open for a suitable
time to allow the water to discharge therefrom the said valves closing in due
course by gravitation. When it is required to place any one of the filter beds
out of operation the lever B2 in connection with the valve B of the

page_text: said filter bed can be disconnected from the said valve and be connected to
the adjacent valve B¹ in the passage A² connected with a supplementary filter bed.
By constructing the chamber D of metal and arranging the tilting vessel F in the
said chamber as described and illustrated, the apparatus is rendered very compact.
The arrangement illustrated by Figures 3 and 4 is similar to that hereinbefore
described except that instead of a tilting vessel for operating the vertical spindle Ga
hydraulic cylinder and piston are provided for this purpose. The said hydraulic
cylinder is shewn at F mounted on a pedestal F2 in the chamber D and is supplied
with water under pressure from an elevated cistern or from a town main. The
parts corresponding to those shewn in Figures 1 and 2 are indicated by the same
letters of reference. As the water rises in any one of the filter beds it rises to the
same level in the corresponding cistern a² and when it reaches a predetermined
height it raises the float in the said cistern. K is a pipe in the chamber D com-
municating by a pipe K¹ with the town main or with an elevated cistern the said
pipe K communicating by branch pipes K2 with a pipe K³ communicating by a
pipe K with the hydraulic cylinder F beneath the piston of the said cylinder. The
branch pipes K2 correspond in number to the number of filter beds in the series and
each branch is provided with a cock the plug of which is provided with a lever k¹
connected at one end by a chain or the like to the float in the corresponding cistern a²
the other end of the lever carrying a weight which when the float rises effects the
turning of the plug of the cock k to admit the pressure water to the pipes K³ K*
and thence into the cylinder F so as to raise the piston in the said cylinder. The
piston as it rises operates through its rod g a lever d so as to impart a motion of
partial rotation to the vertical spindle G the said lever carrying a pawl d³ engaging
the teeth of the ratchet wheel d on the said vertical spindle. By the partial
rotation of the spindle G the cam I fast thereon is caused to open a discharge valve
of a fully charged filter bed and at the same time the trough H is moved into
position to charge a filter bed with unfiltered water. The lever d which carries the
pawl ds has pivotted thereto a slotted rod h the slot of which engages a stud h² on
a lever fast on the plug of a cock h³ in connection with the hydraulic cylinder beneath
the piston, the slot in the said rod h being of such a length that when the piston is
about to complete its up stroke one end of the slot by coming into contact with the
stud h² opens the cock h³ and allows the water to escape from the cylinder F. The
piston then descends assisted by weights f on the piston rod, and through the
lever d draws the pawl d³ over the teeth of the ratchet wheel to take up a fresh
position for the next operation. As the piston is about to complete its descent the
opposite end of the slot in the rod h acts on the stud 2 to close the cock h³. The
several cocks which admit pressure water to the hydraulic cylinder are opened in
succession as herein before described and the said cocks are closed one after another
at each partial rotation of the spindle G by an arm g² fast on the said spindle
coming into contact with an arm k² on the plug of each cock.
In the modification illustrated by Figures 5 and 6 a fixed trough H is provided
instead of the movable trough hereinbefore described for conducting the unfiltered
water to the several filter beds, and the vertical spindle G and connected parts are
dispensed with. The trough H has outlets i in number corresponding to the
number of filter beds in the series the said outlets communicating by spouts or
channels H2 with the several filter beds. Each outlet is provided with a sliding
door or sluice valve 22 operated, to permit the liquid to flow from the trough, by a
hydraulic cylinder L' L2, and so on, connected to each door or sluice valve, and
arranged to slide over a fixed or stationary piston l. The passage of filtered water
from the filter beds is governed by valves, 1, 1ª, 2, 2, 3, 3ª and so on, arranged in
pairs, so that either of the valves in connection with one of the said filter beds can
be put out of action and the other valve of the pair, which communicate with a
supplementary filter bed, be brought into use. Each of these valves comprises
a cylinder m disc m¹ cone m² piston m³, and hollow piston rod m². The pistons
and hollow piston rods are stationary whilst the cylinders together with the
discs m¹ and cones m² are movable. The passages or boxes containing each

page_text: pair of valves communicate, by branch pipes, with a pipe k¹ k², and so on,
leading to a cistern (112 and so on, situated beneath the stationary trough H, the
said pipes ¹ &c. being each provided with a three-way cock 21 22 and so on, by
means of which either valve box of the pair of valve boxes, as required, can be
put into communication with its corresponding cistern. K is a pipe communicating
with the town main or with an elevated cistern to which pipe are connected other
pipes S¹ to S8 to which the hollow piston rods m4, of the discharge valve 1, 1, 2, 28,
and so on, are connected. The pipes S¹ to Ss are each provided with a cock o for
discharging the water from the cylinders of the discharge valves, 1, 1, 2, 2" and
so on, the said cocks being opened one after another as floats rise in the cisterns.
The water from a filter bed enters the corresponding valve box, say for instance the
box of valve 1, and as the level of the water in the filter bed rises it will rise to the
same extent in the vertical pipe connecting the said valve box with the small
cistern beneath the stationary trough. When the level of the water reaches a
certain height the float 6 in the cistern will have risen with it and through the
weight attached to the float cause the plug of the cock r¹ in the pipe K, which is
attached to the chain carrying the weight, to turn so as to open a passage in
connection with a drain pipe to allow the water to discharge from the cylinder of
the sluice valve which valve will close by its own weight and cut off the supply of
water to the full filter bed, and at the same time a detent is released, which will
allow the float in the next cistern to desceud and open the cock which will admit
water under pressure to the cylinder of a sluice valve to admit unfiltered water to
the next filter bed to be charged and also water pressure to the cylinder of the
outlet valve of the next filter bed to be emptied. Figure 6 shews diagrammatically
the arrangement and operation of the valves. The filter bed in connection with the
valve box 1 is being charged with unfiltered water through the ontlet i from the
trough H the filtered water from the said filter bed entering the valve box 1 and
rising in the tube into the cistern . When the water reaches such a level
as to raise the float in the cistern the weight 61 connected to the valve
by a chain or the like, will cause the plug of the cock in the pipe K to turn
thereby opening a passage which allows the water to escape from the cylinder of
the sluice valve i which valve will then close and cut off the supply of unfiltered
water to the filter bed in connection therewith. The chain or the like which
connects the float in the cistern to the plug of the cock r¹ in the pipe K passes over
two pulleys t t one of which t is provided with ratchet teeth with which a detent u
engages to maintain the float in its elevated position. The rotation of the pulleys t t¹ by
the rising of the float causes an arm won the pulley t¹ to act, through levers x, on
the detent u of the pulley t on the adjacent cistern - so as to release the said pulley
and allow the float in the said cistern 12 to descend and through the conuecting
chain or the like turn the plug of the cock 2 in the pipe K in the direction to admit
water under pressure into the cylinder L2 of the sluice valve so as to open the said
valve to admit unfiltered water from the trough H into the corresponding filter bed
and also admit pressure water to the cylinder of the outlet valve 6 which is thereby
opened to discharge the filtered water from the filter bed in connection therewith.
In like manner each filter bed may be charged and emptied one after another.
In the diagram the filter bed in connection with the valve 1 is being charged with
unfiltered water, as before described the filter beds in connection with the valves 2
and 3 being at rest the filter beds in connection with the valves 4 and 5 are
emptying whilst the filter beds in connection with the valves 6, 7 and 8 are standing
full. It will be seen from the diagram that when No. 1 bed filling, No. 5 bed is
emptying; while No. 2 bed is filling No. 6 bed will be emptying; while No. 3 bed
is filling No. 7 bed will be emptying; and while No. 4 bed is filling No.
is emptying; while No. 5 bed is filling No. 1 bed is emptying; while No. 6 bed is
filling No. 2 bed is emptying; while No. 7 bed is filling No. 3 bed is emptying;
and while No. 8 bed is filling No. 4 bed is emptying. When any one of the filter
beds 1 to 8 required to be placed out of use for cleaning or otherwise the valve in
connection with the said bed is put out of action, for example suppose say No. 4
bed

page_text: bed requires to be cleaned the hollow piston rod of the valve 4 is closed by a plug
at and the three way cock reversed a like plug z in connection with the piston
of the valve 4 being opened thereby bringing into use a supplementary filter bed
in connection with the said valve 4*. In like manner any one of the other filter
beds may be put out of action and a supplementary filter bed brought into use in
place thereof.
Instead of admitting the filtered water to the float boxes or cisterns a² through
the bottom of the said boxes or cisterns as shewn, each pipe a may extend up the
side of the box, to the height to which the float is required to rise, and then be bent
down to form a syphon the short leg of which enters a small chamber fixed to and
communicating with the float chamber. The water from the filter bed rises in this
pipe until it reaches the bend therein, then passes down the short leg of the syphon
into, the small chamber and thence into the float chamber until by the incoming
water the float is raised and as herein before described cuts off the supply of
unfiltered water to the bed which is filled and releases the float of the next cistern
to open the valves in connection with the next beds to be charged and discharged.
While the bed is emptying the water will discharge from the float box through the
syphou pipe and pass away as before described.
Having now particularly described and ascertained the nature of my said
invention and in what mauner the same is to be performed, I declare that what
I claim is -
1. In apparatus for filtering sewage water or other liquids, the combination with
two or more filter beds of a chamber such as D constructed of metal and having
passages therein connecting the filter beds with a reservoir vatercourse or the like;
valves in the passages for controlling the passage of water from the filter beds to
the reservoir, watercourse, or the like, a vertical shaft or spindle mounted in
bearings in the chamber D a cam disc fast on the vertical shaft or spindle a tilting
vessel mounted in bearings in the chamber D means for admitting filtered water to
the tilting vessel to tilt the said vessel when the water in the filter beds reach a
certain level and means for imparting motion of partial rotation to the vertical
shaft or spindle so as to cause the cam thereon to open, one of the valves opening
the communication between a filter bed and the reservoir or watercourse each time
the tilting vessel is operated substantially as and for the purpose hereinbefore
described.
2. In apparatus for filtering sewage water or other liquids, the combination with
two or more filter beds of a chamber such as D constructed of metal and having
passages therein connecting the filter beds with a reservoir, watercourse or the
like; valves in the passages for controlling the passage of filtered water from the
filter beds to the reservoir, watercourse or the like, a shaft or spindle mounted in
bearings in the chamber Da cam on the shaft or spindle to open the valves in
succession one after another, a hydraulic cylinder and piston in the chamber D
means for opening communication between the hydraulic cylinder and the town
main or with an elevated cistern when the level of the water in a filter bed reaches
a certain level, and means for imparting motion of partial rotation to the shaft or
spindle carrying the valve operating cam so as to open a valve to discharge a filter
bed at each partial rotation of the shaft or spindle substantially as herein before
described.
3. In apparatus for filtering sewage water or other liquids the combination with
two or more filter beds, of a chamber such as D having valve controlled passages
for the filtered water from the filter beds to a reservoir watercourse or other place,
a stationary trough, in the chamber D into which the liquid to be filtered is fed
opening in the trough communicating with conduits leading to the filter beds,
sliding doors or sluice valves governing the passage of unfiltered liquid from the
trough; hydraulic cylinders fixed to the sliding doors or sluice valves stationary
pistons fitting the hydraulic cylinders and having hollow piston rods connected to
a pipe communicating with a town main or elevated cistern; a pipe connecting

page_text: each passage for filtered water from the filter bed with a small cistern situated in the
chamber D, a float on each of the said cisterns connected by a chain or the like to
a lever on the plug of a cock in a pipe communicating with the town main or the
elevated cistern; branch pipes connecting the last mentioned pipe with another
pipe in the lower part of the chamber D and connected to hollow piston rods of
hydraulic cylinders attached to the controlling valves in the passages from the
filter beds to the reservoir or the like, the whole being arranged so that when the
water in a filter bed rises to a certain level the float in the corresponding small
cistern will rise and open a cock in the pipe in connection with town main or
elevated cistern and cause a discharge valve of a filter bed to open substantially as
herein before described.
4. A valve for the purpose herein before described comprising a disc, a cone and
a cylinder connected together, and a stationary piston with a hollow piston rod
through which hollow rod water can enter the cylinder so as to open the valve.
substantially as herein before described.
5. The combination and arrangement of parts constituting apparatus for
automatically charging and discharging filter beds substantially as herein before
described and illustrated by Figures 1 and 2 of the accompanying drawings.
6. The combination and arrangement of parts constituting apparatus for
automatically charging and discharging filter beds substantially as hereinbefore
described and illustrated by Figures 3 and 4 of the accompanying drawings.
7. The combination and arrangement of parts constituting apparatus for
automatically charging and discharging filter beds substantially as herein before
described with reference to Figures 5 and 6 of the accompanying drawings.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.