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N06. 16,1948.
E. T. BIRSCH E'rAI. _
SERIES FILTRATION
‘ ,
'
2,454,124
'
Filed April 25, 1946
'
INVENTORJ.
EDWIN T BIRSCH
Y WILLIAM D. SILCOX
I’ Patented Nov. 1.6,‘ 1948
, 2,454,124
‘UNITED ‘STATES PATENT OFFICE
Edwin 'r. Birsch and William 1). Sllcox, Lewis
town, Pa., assignors to American Viscose Cor
poration, Wilmington, Del., a corporation of
Delaware
Application April 25, 1948, Serial No. 664,879
2 Claims. (Cl. 210-62)
1
2
This invention relates to the ?ltration of dis
ence character I. From this reversing valve sys
tem the dispersion proceeds through two sets
of ?lters A‘ and B in either sequence depending
upon the setting of the reversing valve 5. Each
set oL?lters comprises at least two individual
?lters (six being shown in each set). The ?lters
of each set are connected in parallel and are pref
persion through two or more sets of ?lters in se
quence and is particularly concerned with a sys
tem for insuring the best possible ?lter action
continuously while cutting out at intervals the
' exhausted ?lters for cleaning.
Accordingly, the invention provides an 'im
proved method and apparatus for ?ltering which
provides continuous ?ltration while permitting
cutting out each ?lter at intervals for cleaning
as it becomes completely clogged or exhausted,
' and what is most important the restoring of the
cleaned ‘?lters to a position in the ?ltration sys
tem always in advance of the more seasoned or
' erably of the closed pressure type. For example,
any sort of ?lter press may be provided, such as
a rotary leaf press, or a. plate and frame. press,
and these ?lters may or may not be provided with
washing connections. .As shown, a simple, non
washing, plate and frame press may be used.
,
Set A of ?lters has ‘a supply headerii and a
partially clogged ?lters currently operating at the
discharge header ‘I. Each of the connections 8
time of such restoration of cleaned ?lters to the
and 9 which the branch lines to each ?lter make
with the headers is provided with a three-way’
system. By restoring the cleaned ?lters in ad
vance of the more seasoned ?lters, the best pos
' cock or valve. Similar connections are provided
' for the set of ?lters B. The dispersion leaves the
sible ?ltration is maintained, since the cleaned
?lters have a somewhat larger pore size and would 20 valve reversing system through a port l0 and may
take out the largest particles, so that the smaller
proceed to any subsequent stage, such as a storage
particles in the dispersion which leaves the rela
tank, or in the case of viscose, to the spinning
machines through a line Ii.
,
tively clean ?lters are removed in the latter or
The reversing valve system 5 comprises a set of
last stages or stage of ?ltration in which the sea
soned ?lters are used exclusively. Other objects 25 four 4-way valves or cocks l2, l3, l4 and i5. Each
and advantages of the invention will be apparent‘
valve or cock has four ports and each valve may be
from the drawing and the description‘ thereof
disposed at the corner of a square as shown, to
hereinafter.
facilitate simultaneous operation by means of a
In the drawing, which is illustrative of the in
common gear ill (see Figure 3) which may be
vention,
30 driven by a hand wheel ii and four gears mesh
Figure > 1 illustrates diagrammatically a pre
ing with the common gear it. Each of the four
ferred ?ltration apparatus for carrying out the
gears I8 is secured to the stem of one of the tour
?ltration system;
4-way valves.
.
Figure 2 is a similar diagrammatic view of the
same apparatus with the relations .between the
sets of ?lters reversed; and
v
_
The opposed ports of adjacent valves are con
. nected as at i9, ‘whereas the lateral ports 20 and
2| of valves l2 and I! are connected by a pipe
Figure 3 is a plan view showing the reversing
22. The port 23 is connected to the supply header
valve system.
The invention may be applied to the ?ltration
of dispersions of any sort whatsoever ‘and one par
ticular use for which the system is advantageous
is for the ?ltering of a viscose'solution as it is
forced from spinning tanks to arti?cial ?lament
of the set of filters A by a conduit 24. The dis
charge header of the set of ?lters A is connected
by a pipe 25 with the port 26 of valve l5 and the
port 21 of valve 15 is connected by a line 28 with
the supply header of the set 'of ?lters B. The
discharge header of the set of ?lters B is con
spinning machines, the ?lters being interposed in
nected by a line 29 to the port 30 of valve I4 and,
as stated before; port ill of valve it is connected
with line I l for discharging the ?ltered dispersion
the line from the tanks to the machines.
With reference particularly to Figure l, the dis
persion, such as of viscose, may proceed from a
supply tank 2, such as one or more spinning tanks,
through a line 3 to one port 4 of the reversing
valve system designated generally by the refer
from the system.
,
Figure 1 shows one setting of the reversing
valve 5 by which the dispersion supplied to it
50 through line 3 is sent ?rst through the set of
2,454.,124
3
?lters A and then through the set of ?lters B and
Figure 2, so that the dispersion is ?rst directed
through the ?lters B and then through ?lters A
is ?nally discharged from the system through
line H. in Figure 2, the individual valves of
' which by this time have become partially clogged.
reversing valve 5 are turned through a 90° angle
clockwise as viewed in Figures 1 and 2 so that the
After the valve 5 has been turned to the setting
of Figure 2, the balance or the dirty ?lters in the
dispersion supplied through line 8 is directed ?rst
through the set of ?lters B and then through the
‘ set E can be cleaned and restored to, service in I
set of ‘?lters A and ultimately is discharged from
the system through line it as before.
the set after cleaning.
Whereas the preceding description indicates
that tank 2 is a supply tank and line II is the
10 discharge line from the ?ltering system, it is
clear that the dispersion to be ?ltered could as
tion is as follows: At the start of ?ltration, both
well be supplied through line H and discharged
sets of ?lters A and B may be clean, or the set
The manipulation of the system during ?ltra
of ?lters B may be partially clogged. Assuming
that both start out in clean condition with the
from the ?lter system through line 3, and the
reversing valve 5 would be shifted between the
valve setting in the position of Figure 1, the set 15 settings of Figure l and Figure 2 in the same
manner as in the preceding description for ac
of ?lters A will do practically all of the ?ltering
complishing the same highly emcient ?ltration.
at the start. When the set of ?lters A has be
come partially clogged, such as by allowing a
It will thus appear that the invention pro
vides a simple procedure and arrangement for
substantial period of ?ltering to occur, say from
$4; to 1/2 or" the normal useful ?ltration period of 20 maintaining the highest ei?ciency of ?ltration
in a system comprising a series of two or more
the ?lters, the individual valves of the reversing
sets of parallel-connected ?lters. The procedure
valve 5 are turned clockwise through 90° into
assures that whenever cleaning ?lters are re
the position shown in Figure 2 so that the dis
stored to operation, they will always be the ?rst
persion passes ?rst through the less clogged ?lters '
B and then through the more completely clogged 25 through which the dispersion is passed.
It is to be understood that changes and varia
?lters A. This assures the best emciency of ?l
tions may be made without departing from the
tration since both sets of ?lters are working,
spirit and scope of the invention as de?ned in
filters B removing the larger particles and filters
the appended claims.
\
A removing the ?ner particles. When ?lters A
We claim:
7
J
approach near the end of their useful ?ltering 30
1. Apparatus for ?ltering dispersions compris
period, 1. e., when they may be said to be exhausted
ing a set of ?lters connected in parallel between
or nearly completely clogged, it is necessary-to
a supply header and a discharge header therefor,
clean them. At this time, one or more but not
a second set of ?lters connected in parallel be
all of the ?lters A may be cut out of the set by
closing the cocks t and 9 against the branch line 35 tween a supply header and a discharge header
or lines to the ?lters. The ?lters thus out o?
may be cleaned but they cannot be restored until
the reversing valve 5 has been turned into the
therefor, a supply conduit, a discharge conduit,
a set of four four-way valves arranged at the
corners of a quadrilateral conduit system, each
position shown in Figure 1, this being done by
valve having four ports, of which two are con
turning the individual valves counterclockwise 40 nected with the adjacent ports of the adjacent
through 90° as viewed in Figure 2. If desired,
valves, the third port of two adjacent valves be
ing connected together, the remaining port of
the reversing valve may thus be turned back into
the position of Figure 1 before any of the ?lters
one of the last-mentioned adjacent valves being
A are cut out for cleaning. By restoring the
connected to the supply conduit, the remaining
clean ?lters in the set of ?lters A after the valve 45 port of the other of the last-mentioned adjacent
5 has been turned back into the position of Figure
valves being connected to the supply header of
1, the dispersion will pass through clean ?lters
the second set of ?lters, the adjacent port of
?rst and then through partially clogged ?lters of
another valve adjacent the last-mentioned valve
the set B, thereby maintaining again the best ?l
being connected to the discharge header of the
tration ef?ciency. While the valve 5 is in the po 50 ?rst set of ?lters, the remaining port of said
sition of Figure 1, all of the remaining dirty ?lters
other valve being connected to the discharge con
in the set A‘ may be cut out one or more at a
duit, a third port of the remaining valve adja
time until all have been cleaned, it being essen
cent the last-mentioned port being connected to
tial only to maintain one or more of the set
the discharge header of the second set of ?lters,
whether cleanv or dirty in the line to maintain
and the remaining port of the last-named valve
continuity of flow.
‘
being connected to the supply header of the ?rst
Coming back to the situation in which the sys
set of ?lters.
tem is operating with the reversing valve in the
2. Apparatus for ?ltering dispersions compris
setting shown in Figure 1 and in which the set
ing a set of ?lters connected‘ in parallel between
of ?lters B were started in an initially clogged 60 a supply header and a. discharge header therefor,
condition, whereas the set of ?lters A are clean
a second set of ?lters connected in parallel be
or in a relatively clean condition as compared to
tween a. supply header and a discharge header
the ?lters B, the setting of valve 5 may remain
therefor, a. supply conduit, a discharge conduit, a
as shown in Figure 1 until nearly the end of the
set of tour four-way valves arranged at the
useful ?ltration period of the ?lters B. At this 65 corners of a quadrilateral conduit system, each
time when such ?lters have almost reached the
valve having four ports, of which two are con
maximum permissible clogging, cleaning is in
nected with the adjacent ports of the adjacent
valves, the third port of two adjacent valves be
ing connected together, the remaining port of one
after the reversing valve 5 is turned into the 70 of the last-mentioned adjacent valves being con
‘position shown in Figure 2 while maintaining
nected to the supply conduit, the remaining port
continuity ‘of ?ow through the balance of the
of the other of the [last-mentioned adjacent
dirty ?lters in the set B. However, before the
valves being connected to the supply header of
cleaned ?lters are restored to the set, the re
the second set of ?lters, the adjacent port of
versing valve 5 must be turned to the position in 75 another valve adjacent the last-mentioned valve
order. As in the case mentioned before, one or
more of the ?lters B may be cut out before or
2,454,124
heing connected to the discharge header of the
?rst set of ?lters, the remaining port of said
UNITED STATES PATENTS
other valve being connected to the discharge con-
“2338571
cult, e third port of the remaining valve Mia-cent
the lest-mentioned port being connected to the 5
. discharge header of the second set of ?lters, and
.
the remaining port of the last-named valve being
connected to the supply header of the ?rst‘set
‘
of ?lters, and means for simultaneously operatlng seld valves.
EDWIN T- BIRSCHWILLIAM D. SILCOX.
REFERENCES CITED‘
The following refezfences erect record in the 15
?le of this patent:
1360131281832
Jewel] ___________ n Juiy 1' 1390
Knight''''''' jun-3m 13' 1391
535’366
Hem
629'942
wannérlfg """ " Aug' 1’ 1399
1805’374
344L138
1“
“game
431,229
444’754
" """"" "‘ Mar' 12’ 1895
v McDonald
Bayley
____ n'n Nov/21’ 1905
Feb.'19,, 1907 '
1,328,045
Hills _____________ __ Jan. 13, 1920
2314s“
Hagan _______ _‘_____ Sept. 10,1940
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