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Патент USA US3078000

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Féb. 19, 1963
M. E. LARKIN
3,077,989
AUTOMATIC SELF CLEANING FILTER APPARATUS
Filed Sept. 5, 1958
2
2
52a
F/G. 2
INVENTOR.
M.E. LARKIN
',a|
BY
United States Patent 0
amass
Patented Feb. l9, 15953
2
3,677,;‘389
AUTGMATEI SELF ‘CLEANENG METER
APE'ARATUS
Marl; E. Larlrin, Bartiesville, Gide, assignor to Phillips
Petroleum Company, a corporation of Delaware
Filed Sept. 5, 1958, Ser. No. ‘7553197
6 Qlairns. (ill. nth-93)
conducted in a plurality of ?lter elements automatically
in a self sustaining manner independent of an external
source of power for switching the ?ow of ?uid to be
?ltered and the flow of wash ?uid.
Another object of this invention is to provide a ?ltra
tion apparatus in which a reversal of the direction of
flow of the ?uid through the ?ltering medium is brought
about by a pressure condition built up in the ?lter during
The invention relates to ?uid handling. in one aspect,
the delivery of ?uid thereto.
this invention relates to a method for conducting ?ltration 10
Another object of this invention is to provide a shuttle
operation in an automatic manner. In another aspect,
valve apparatus adapted to periodically change the how
this invention relates to ?ltration apparauts for conducting
of fluid alternatively in an abrupt and precise manner.
?ltering and washing operations automatically in a plu
Another object of this invention is to provide a shuttle
rality of ?lters. In another aspect, this invention relates
valve wherein the switching of ?ow is dependent upon
to shuttle valve apparatus for switching stream ?ows
a characteristic of the ?uid ?owing therethrough.
abruptly in an alternate manner to separate chambers.
Other aspects, objects and advantages of the invention
in ?ltration processes, suspended material in the ?uid
are apparent from a consideration of the accompanying
to be ?ltered is deposited upon the ?lter element until
disclosure, drawings and the appended claims.
the ?lter element becomes so plugged with deposited
In accordance with the invention there is provided a
material that the ?ow of ?uid therethrough is severely
restricted. In order to clean the ?lter element, the ?ow
of ?uid to the ?lter is cut off and a wash fluid is directed
to the reverse side of the ?lter element to dislodge and
remove the suspended material denosited on the surface
of the ? te . Then, the ?ow wash ?uid is cut oil and
the ?ow of ?uid to be ?ltered is again directed onto the
surface of the ?lter. Usually the changes from ?ltration
operation to washing operation and back to ?ltration
operation are made on a time basis; that is, after a pre
determined period oi‘ time has passed, the flow of ?uid to
be ?ltered is cut off and the washing operation takes
place for a set period of time after which time the ‘low of
wash fluid is cut oil and the flow of ?uid to be ?ltered is
again started. Where the ?uid to be ?ltered contains
varying quantities of suspended material, this method of
operation is very inefficient since the washing operation
can take place either before the optimum quantity of
suspended material has been deposited on the surface of
the ?lter or after the ?lter has become so clogged with
?ltration apparatus, and method for conducting ?ltration
operations, wherein movable ?lter elements are moved
in accordance with the increase in the differential in
pressure on opposite sides of one ?lter element as sus
pended material is deposited thereon to thereby store
power in an actuating means which abruptly switches the
?ow of ?uid to another ?lter element when a prede
termined power level is reached. The power for switch
ing the ?ow of ?uid is obtained from the actuating means,
such as a resilient connecting device disposed between
the movable ?lter element and a shuttle valve means.
A
tension spring is the preferred actuating means. While
a second ?lter element is ?ltering hold, the ?rst ?lter
element is cleaned by the direction of a wash ?uid, pref
35 erably ?ltered ?nid, against the reverse side of the ?lter
element to dislodge deposited material therefrom. The
?ltration and washing steps take place automatically as
determined by the state of the ?lter element evidenced
by the dillerence of pressure on its two sides.
Further, in accordance with this invention, there is
deposited material that the optimum ?ow of ?ltered ?uid 40 provided
a shuttle valve apparatus wherein ?ow is
is not obtained.
In many ?ltration operations, the Switching of ?uid
switched very abruptly and precisely when the power
stored in a resilient actuating means, preferably a spring,
to be ?ltered and wash ?uid is done automatically and
is su?icient to overcome the action of a holding means
usually electrical means are utilized for operating the
preventing the movement of a shuttle valve element in
necessary valve arrangements. It is desirable in many 45 said shuttle valve apparatus. The displacement of mov
?ltration operations, and particularly where the ?ltration
able diaphragm elements or pistons stretches the spring
apparatus is to be used with automatic analyzing instru
means to store power therein and said spring means pro
ments, that the ?ltration apparatus be self-sustaining and
vides the abrupt and quick action effecting switching of
free from the need for an outside source of power for
the shuttle valve element. The shuttle valve element of
controlling the ?ltration operations.
the shuttle valve is held in one position by a holding
I have discovered a method and apparatus whereby the
means such as a spring loaded detent means until the
di?erence of pressure on two sides or" a movable ?lter
power stored in the spring loaded actuating means is
element can be utilized to abruptly switch the ?ow when
suf?cient to overcome the holding action of the detent
the ?lter element becomes clogged to permit automatic 55 means. The movable diaphragm elements are adapted
washing of the ?lter element.
to permit restricted ?ow of ?uid therethrough and two
An object of this invention is to provide a method for
slide valve elements are used to switch the flow of two
switching flow to several ?lters automatically when the
?ow streams in an alternative manner with the ?ow path
pressure diiferential on opposite sides of a ?lter reaches a
of one stream being through the movable diaphragm
predetermined level as ?uid is passed therethrough,
60 elements and the hollow piston rods a?ixed thereto.
Another object of this invention is to provide a method
Referring to the drawings, FIGURE 1 is a longitudinal
for conducting ?ltration operations wherein dirty ?lters
cross sectional view of the ?lter apparatus of this in
are washed automatically in a manner that deposited
vention. FIGURE 2 is a cross sectional view taken along
material dislodged from the ?lters cannot be drawn into
the line 2-2 in FIGURE 1. FIGURE 3 is an end View
the stream of the ?uid being ?ltered.
65 or" the apparatus shown in FIGURE 1.
Another object of this invention is to provide a self
Referring to the drawings, the casing of the ?lter ap
cleaning ?lter apparatus adapted for the automatic re
paratus comprises slide valve body 10 of circular cross
moval of impurities from a ?uid and the automatic re
moval of deposited material from ?lters clogged with such
impurities.
Another object of this invention is to provide a ?lter
apparatus wherein ?ltration and washing operations are
section with end caps 11 and 12 attached on the opposite
sides of slide valve body it} by means of bolts 13. Cap
11 and slide valve body It) form a ?rst cylindrical ?ltra
tion chamber 14 enclosed at each end and cap 12 to
gether with slide valve body 10 form a second cylindri
8,077,989
3
4
cal ?ltration chamber 15 enclosed at each end. Fluid
communication between ?ltrate receiver 54 and ?ltration
inlet 16 for the introduction of ?uid to be ?ltered and
wash ?uid outlet 1'7 for the withdrawal of wash ?uid
chamber 14 on the one hand and between ?ltrate receiver
54 and wash ?uid inlet chamber 52 on the other. This
containing suspended material are provided in slide valve
body 10. Wash ?uid inlets 18 and 19 are provided in
the ends of caps 11 and 12, respectively. Filtered ?uid
outlets 2t) and 21 for the withdrawal of ?ltered ?uid are
slide valve arrangement is also present in the construc
tion of piston ?lter housing 45 within cap 12. Fluid inlet
chambers 52 and 53 are sealed by closure 52a and 53a
respectively.
Slide valve elements 24 and 35 are held in a ?xed
provided in caps 11 and 12, respectively, adjacent the
position in slide valve body 10 by detent members 60
enclosed ends.
Slide valve body 10 is provided with an axially located 10 and 61 as shown in FIGURE 2 of the drawings. Detent
members 60 and 61 are both held in place in circum
ferential groove 29 by the action of springs 62 and 63.
Plugs 64 and 65 in turn hold springs 62 and 63 in place
and inserts 66 and 67 in combination with gaskets 68
comprises an elongated cylindrical rod having axial holes
drilled in each end to form spring housing 25 at one end 15 and 69 provide a ?uid sealing relation. As shown in
the drawings, slide valve elements 24 and 35 project into
and spring housing ‘26 at the opposite end. A plurality
?ltration chamber 15 when detent members 60 and 61
of radially arranged openings 27 and 28 are located ad
are located in circumferential groove 29. Correspond
jacent the solid portion of slide valve element 24 through
ingly, slide valve elements 24 and 35 will be located or
the walls of spring holders 25 and 26, respectively. Cir
projected into ?ltration chamber 14 when detent mem~
cumferentially arranged grooves 29 and 30 are provided
bers 60 and 61 are located in circumferential groove 30.
at the midpoint of slide valve element 24. Slide valve
Connection between piston ?lter housings 44 and 45
element 24 is slidably mounted within bore 22 in slide
with slide valve elements 24 and 35 is provided by ten
valve body 16 and adapted to be moved or reciprocated
sion springs 70 and 71, respectively. Springs 70 and 71
in slide valve body 10 so as to protrude alternatively into
?ltration chambers 14 and 15. The extent of projection 25 are inserted in spring housing 25 and 26, respectively,
with one end of each spring 70 and 71 rigidly ?xed to
into chambers 14 and 15 is limited by support members
slide valve element 24 by spring retainers 72 and 73,
31 and 32 a?ixed to the ends of slide valve element 24.
respectively and the opposite ends of each spring rigidly
Gaskets 33 and 34 provide pressure sealing relation be
a?ixed to ?lter elements 42 and 43 by means of spring
tween inlet chamber 23 and ?ltration chambers 14 and 15,
respectively. Wash slide valve element 35 is located in 30 retainers 74 and 75. Detent springs 62 and 63 and ten
sion springs 76 and 71 are selected with spring charac
slide valve body 16 in bore 36 arranged parallel to bore
teristics which permit detent members 60 and 61 to jump
22. Wash ?uid outlet 17 is in open communication with
bore 22 having a center section of somewhat larger di
ameter forming inlet chamber 23 which is in open com
munication with ?ow inlet 16. Slide valve element 24
bore 36.
Wash slide valve element 35 is milled on op
from one circumferential groove 29 to the other circum
ferential groove 30 when openings 58 and 59 in piston
portions 37 and 38 which are approximately the same 35 rods 48 and 49 are ?rst closed off by bore 50 and bore 51
in the enclosed ends of caps 11 and 12.
diameter as the diameter of bore 36. Hole 39 is drilled
The compression force created by detent springs 62
at the midpoint of wash slide valve element 35 through
and 63 can be readily adjusted by plugs 64 and 65 to
the milled sides of wash slide valve element 35. Wash
regulate the total force required to move valve element
slide valve element 35 is slidably mounted within bore
24 from one position to the other.
36 and arranged to reciprocate therein to protrude into
Filter ?uid outlet 20 is connected to wash ?uid inlet
?ltration chambers 14 and 15 with the movement of slide
19 by means of conduit 76 and ?lter ?uid outlet 21 is
valve element 35 corresponding to the movement of slide
connected to wash ?uid inlet 18 by means of conduit
valve element 24 through the attachment of slide valve
77. Filter ?uid outlet conduit 78 is connected to conduit
element 35 to slide valve element 24 by means of support
elements 31 and 32 af?xed to the respective ends 37 and 45 76 by means of conduit 79 and to conduit 77 by means
of conduit 80. Wash ?uid conduit 81 is connected to
38 of slide valve element 35. Gaskets 40 and 41 provide
wash ?uid outlet 17 and inlet conduit 82 is connected
pressure sealing relation between end portions 37 and 38
to ?uid inlet means 16. Valve 83 in conduit 76 and valve
of slide valve element 35 and slide valve body 10.
84 in conduit 77 provide for controlling the proportion
Movable ?lter elements 42 and 43, located respectively
in ?ltration chambers 14 and 15, are mounted on piston 50 of ?ltered ?uid which is utilized as wash ?uid for remov
ing deposited material from the ?lters.
?lter housings 44 and 45. Long stroke ?exible dia
In operation, ?uid to be ?ltered is introduced through
phragms 46 and 47 provide pressure sealing relation be
?uid inlet 16 into inlet chamber 23 from which it is
tween piston ?lter housings 44 and 45 and the internal
discharged by means of slide valve element 24 through
walls of caps 11 and 12. Piston ?lter housings 44 and
45 are arranged with piston rods 48 and 49 directed to 55 openings 27 into ?ltration chamber 14 as shown in FIG
URE 1. At the beginning of ?ltration, ?lter element 42
wards the closed ends of caps 11 and 12. Axially located
is located adjacent to slide valve body 10 but as ?ltration
bores 50 and 51 are located in the ends of caps 11 and 12,
posite sides throughout its length except for small end
continues and suspended material is deposited upon ?lter,
element 42 the pressure builds up in ?ltration chamber
piston ?lter housings 44 and 45 have been displaced to a.
position adjacent the enclosed ends of caps 11 and 12. 60 14 between slide valve body 10 and the face of ?lter
element 42 to force piston ?lter housing 44 to move in
Wash ?uid inlet chambers 52 and 53 are provided in the
an outward direction away from slide valve body 10. The
ends of caps 11 and 12, respectively, in open communica
?uid collects in ?ltrate receiver 54 and passes through
tion with bores 50 and 51 and also in open communica
bore 56 in piston rod 48 and opening 58 into the portion
tion with wash ?uid inlets 18 and 19. The faces of piston
?lter housings 44 and 45 are provided with ?ltrate re 65 of ?ltration chamber 14 between piston ?lter housing 44
and the end of cap 11. The ?ltered ?uid is withdrawn
ceivers 54 and 55 upon which are mounted ?lter elements
from ?ltration chamber 14 through ?lter ?uid outlet 20
42 and 43. Bores 56 and 57 are drilled longitudinally
and conduits 78 and 79.
from the open face of piston ?lter housings 44 and 45
A portion of the ?ltered ?uid from ?ltration chamber
through piston rods 48 and 49 to a point adjacent the ends
of said piston rods. Openings 58 and 59 are radially ar 70 14 is directed through conduit 76 into wash ?uid inlet
19 and wash ?uid inlet chamber 53 from where it is
ranged in piston rods 48 and 49 adjacent the end thereof
introduced
through opening 59 in piston rod 49 into
to provide open communication to bores 56 and 57 with
?ltrate receiver 55 by means otbore 57 in piston rod 49.
in piston rods 48 and 49. The arrangement of openings
This ?ltered ?uid serves to dislodge the suspended mate
58- in piston rod 48 provide a slide valve in combination
rial
deposited. on ?lter element 43 and carries the sus
75
with» bore 50 inthe and ot- cap 11 so as to provide open
respectively, for receiving piston rods 48 and 49 when
3,077,989
5
pended material from ?ltration chamber 15 by ?owing
through bore 36 in slide valve body 10 and from the
apparatus through wash ?uid outlet 17. The wash ?uid
cannot ?ow into ?ltration chamber 14 because bore 36
is closed by end 37 of slide valve element 35. Slide
valve element 24 prevents the ?ow of wash ?uid into
inlet chamber 23.
At this point in the cycle, slide valve elements 24 and
35 as shown in FIGURE 1, project into ?ltration chamber
6
Te?on, porous glass, ?ne mesh wire and ceramics. Pref
erably, the ?lter elements are stiff in nature and resist
bending; however, it is within the scope of this inven
tion to use ?exible ?lter elements with the attachment of
tension springs 70 and 71 to piston ?lter housings 44 and
45 being secured by means of support members ?xed
to piston ?lter housings 44 and 45. If desired, fully
?exible diaphragms can be used without the necessity for
piston ?lter housings 44 and 45 by securing the attach
15 so that the path of ?ow for ?uid to be ?ltered is into 10 ment of springs 79 and 71 to a tube at the center of
each diaphragm in a manner that the tube replaces piston
rods 48 and 49. Of course, further modi?cation of the
?ltration chamber 14 and the path of ?ow for wash ?uid
is from ?ltration chamber 15. As the ?ltration con
tinues, piston ?lter housing 44 is forced away from slide
apparatus of this invention can be devised by those
valve body It) so that tension spring 70 is stretched to
skilled in the art.
store power therein. The compression on detent springs 15
In some operations, it will be found desirable to place
62 and 63 is adjusted so that detent elements 6% and 61
a pressure regulator in conduit 78 in order to maintain
are released from circumferential groove 2% by the force
a ?xed pressure in ?uid ?ow outlets 2d and 21.
stored in spring 70 just as openings 58 in piston rod
The ?ltration apparatus of this invention ?nds particu
48 contact the end wall of cap 11 to shut off the path
lar use in combination with automatic instrumentation for
of ?ow between ?ltrate receiver 54 and ?lter ?uid out 20 the purpose of removing suspended matter from ?uid
let 2%. With the release of detent elements 65 and 61
streams to be analyzed. For example, the ?ltration ap
tension spring 71} abruptly jerks slide valve elements 24
paratus of this invention can be used to remove suspended
and 35 into ?ltration chamber 14 so that slide valve ele
particles of aluminum chloride catalysts found in an iso
ments 24 and 35 no longer protrude into ?ltration cham
butane isomerization e?luent or in an isohexane isom
ber 15 and detent elements 6% and 61 are seated in cir 25 erization effluent. Further, the apparatus of this inven
cumferential groove 3t). In this location of the slide
tion can also be employed in connection with internal
valve elements 24 and 35 the ?ow of ?uid to be ?ltered
combustion engines to ?lter lubricating oil circulating in
has been switched from ?ltration chamber 14 to ?ltration
the engine. Another use of the apparatus of this in
chamber 15 through openings 28 in slide valve element
vention is as a pilot ?lter employed in combination with
24. Similarly, the ?ow of Washed ?uid from ?ltration
large ?ltration apparatus for controlling the ?ltration and
chamber 15 has been cut off and a path of ?ow for the
washing steps of the large size ?lters. In this latter use,
removal of wash ?uid from ?ltration chamber 14 is pro
the ?uid outlets of the apparatus of this invention are
vided through bore 36 around the end 37 of slide valve
connected with a suitable control system for regulating
element 35. Filtration will continue in ?ltration cham
the ?ltration and washing operations of a large ?lter.
ber 15 until the movement of ?lter element 43 is su?‘lcient 35 Other uses of the ?ltration apparatus of this invention
for the power in spring 71 to overcome the holding ac
will occur to those skilled in the art.
tion of detent springs 62 and 63 holding detent members
The apparatus of this invention can be used with
6% and 61 in circumferential groove 30. When this point
?uids in either the gaseous or the vapor form.
is reached, the slide valve elements again operate to switch
Reasonable variation and modi?cation are possible
the ?ow to repeat the ?ltration in ?ltration chamber 14
and the Washing operation in ?ltration chamber 15.
The proportion of ?lter ?uid used to wash the opposite
?lter can vary over a wide range as can be readily deter
mined by one skilled in the art.
In some operations,
within the scope of the foregoing disclosure, drawings
and the claims to the invention, the essence of which
is that there have been provided: ?rst, a ?ltration ap
paratus, and method for conducting ?ltration operations,
wherein movable ?lter elements are moved in accordance
Where the deposited suspended material is very easily 45 with the dilference in pressure on opposite sides of a
dislodged and the ?lter is very readily cleaned, valves 83
?lter element to thereby store power in a shuttle valve
and 84 are adjusted to provide a minimum ?ow of ?ltered
actuating means which abruptly switches the flow of ?uid
?uid for the purpose of washing the ?lters. In contrast,
to the ?lter elements when a predetermined power level is
where the ?lters are very di?icult to clean, a large pro
reached and second, a shuttle valve apparatus wherein
portion of the ?lter ?uid is recycled to the opposite ?lter 50 ?ow is switched very abruptly and precisely when the
in order to effect cleaning thereof and the quantity of
power stored in a resilient actuating means, preferably
?ltered ?uid obtained from the apparatus is reduced.
a spring, is sufficient to overcome the action of a hold
Preferably, a minimum ?ow of ?ltered ?uid is used for
ing means preventing the movement of a slide valve
wash purposes since the amount used subtracts from the
element in said slide valve apparatus.
total amount of ?ltered ?uid obtained from the appara 55
1 claim:
tus.
1. A ?lter apparatus comprising in combination:
As shown in the embodiment described in the draw
a
casing having separated ?rst and second chambers
ings, pressure sealing relation between caps 11 and 12
with piston ?lter housings 44 and 45 is provided by long
stroke ?exible diaphragms 46 and 47. Preferably, these
diaphragms are Beloframs supplied by the Belofram
Company of Massachusetts. Of course, other long stroke
diaphragrns can be employed. Also, the sealing relation
can be obtained by constructing piston ?lter housings 44
and 45 with piston rings in place of ?exible diaphragms 65
46 and 47; however, it is usually preferred to use ?exible
diaphragms because the ?uid to be ?ltered usually con
tains suspended material which may bind the pistons
within ?ltration chambers 14 and 15.
Filtration elements 42 and 43 can be constructed of
a variety of materials provided the materials are suf 70
?ciently porous to permit the ?ow of ?uid therethrough
and sui?ciently impervious to prevent the passage of solids
therethrough. Suitable ?lter elements can comprise
porous stainless steel, sintered bronze, fabric, paper, 75
therein;
a separate ?lter means moveably mounted in each of
said chambers and dividing its respective chamber
in which it is mounted into a ?rst chamber portion
and a second chamber portion;
each of said chambers having:
a ?rst inlet communicating with its said ?rst cham
ber portion for the introduction of ?lter feed
thereto;
a ?rst outlet communicating with its said second
chamber portion for the withdrawal of ?ltered
?uid therefrom;
a second inlet communicating with its said second
chamber portion for the introduction of wash
?uid thereto; and
a second outlet communicating with its said ?rst
chamber portion for withdrawal of used wash
?uid therefrom;
3,677,939
?rst conduit means communicating with said ?rst out
lets of each of said chambers to withdraw ?ltered
a‘luid therefrom; second conduit means communicat
ing with said ?rst conduit means and each of said
second inlets for supplying said chambers with ?ltered
?uid to be used as said wash ?uid; third conduit
means communicating with said second outlets to
Withdraw used wash liquid from each of said cham
8
outlet when ‘the shuttle valve means is in its said ?rst
position and through the said second inlet when the said
shuttle valve means is in its said second position, said
pistons being mounted within said chambers with said
piston rods directed outwardly from said shuttle valve
means.
3. The ?lter apparatus of claim 1 wherein said ?lter
means are attached to an open face piston and a long
stroke ?exible diaphragm provides pressure sealing rela
bers;
flow control means for controlling the opening and 10 tion between said piston and the internal Walls of that
said chamber in which the latter ?lter means is mounted.
‘closing of each of said inlets and outlets;
a 4. The ?lter apparatus of claim 1 wherein said ?ow
shuttle valve means connected to said ?ow control
control means controlling ?ow through said ?rst inlets
means to actuate the same and moveably mounted
comprises a ?rst slide valve element slidably adapted to
within said casing between said chambers to move
15 open and close said ?rst inlets for the introduction of
between a ?rst position and a second position;
?uid to be ?ltered into said chambers, and said ?ow
holding means for maintaining said shuttle valve means
control means controlling ?ow through said second out
lets comprises a second slide valve element adapted to
open and close said second outlets for the withdrawal
valve means and each of said ?lter means for
abruptly switching said shuttle valve means from 20 of said used wash ?uid from said chambers.
5. The ?lter apparatus of claim 2 wherein ?rst out
one of its said positions to the other when the
lets from said chambers are provided adjacent the closed
buildup of pressure against the said ?lter means of
ends of said casing and wherein the ends of said piston
that said chamber in which ?lter feed is ?ltered
rods are adapted to form a valve means with the closed
becomes suf?ciently great to overcome the holding
25 endsof said casing for the ?ow of ?ltered ?uid through
action of said holding means;
said piston rods and out said ?rst outlets when said
said shuttle valve means in its said ?rst position ‘caus
pistons are positioned away from the closed ends of said
ing said flow control means to maintain:
casing and for the ?ow of wash ?uid from said second
said ?rst inlet and ?rst outlet of said ?rst chamber
inlets into said piston rods when said piston rods are posi
open;
tioned adjacent the closed ends of said casing, the latter
said second inlet and second outlet of said ?rst
mentioned valve means comprising said ?ow control
chamber closed;
means controlling the ?ow through said ?rst outlets and
said ?rst inlet and ?rst outlet of said second
second inlets.
chamber closed; and
6. The ?lter apparatus of claim 5 wherein open com
said second inlet and second outlet of said sec
35 munication between said ?rst outlets of one of said cham
ond chamber open;
bers and said second inlets of the other of said cham
and said shuttle valve means in its said second posi
bers is provided by conduit means for the circulation of
tion causing said flow control means to maintain
?ltered ?uid from said one chamber to said other cham
said inlets and outlets in open and closed condi‘.
her for washing the ?lter means in the latter.
tions the opposite of that maintained when said
40
shuttle valve means is in its said ?rst position;
References Cited in the ?le of this patent
whereby ?lter feed is ?ltered in one of said chambers
UNITED STATES PATENTS
while the ?lter means- in the other of said chambers is
in its said positions;
and means disposed and connected between said shuttle
beingwashed with said wash fluid.
2. The ?lter apparatus of claim 1 wherein each of
45
said ?lter means are attached to an. open face piston
having a» piston rod containing a passageway therethrough
for the ?ow of ?uid through said ?lter means and the
open face of said piston and then through the said ?rst
1,171,611
Hauer _______ _,_ _____ __ Feb. 15, 1916
1,784,103
2,434,427
2,679,320
Lowen ______________ __ Dec. 9, 1930
Muller ______________ __ Jan. 13, 1948'.
Walton _____________ __ May 25, 1954
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