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Патент USA US3030991

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April 24, 1962
G, N. CHATHAM ETAL
3,030,981
DIVERTING VALVE WITH INDEPENDENT PISTONS
Filed March 23, 1961
2 Sheets-Sheet 1
' “NV/“Nu
INVENTORS
GEOA’GE' IV. CHAT/944M
8Y0 0 S/YUQTLEFF
United States Patent
ice
1
3,030,981
DIVERTING VALVE WITH INDEPENDENT
PISTONS
George N. Chatham and 0 0 Shurtlelf, Austin, Tex.,
assignors to Chatleif Controls, Inc., Austin, Tex., a
corporation of Texas
Filed Mar. 23, 1961, Ser. No. 97,776
4 Claims. (Cl. 137-628)
This invention relates to valves used for diverting ?uid
vfrom one passage to another.
It is among the objects of this invention to provide a
v_
3,030,981
Patented Apr. 24, 19,62
2
which extends a vertical passage 7 that connects the
upper and lower chambers. The passage is considerably
smaller in diameter than the chambers, and the side
Wall of the passage projects a short distance above and
below the partition to form circular valve seats 8 and
9 spaced from the side walls of the chambers. Midway
between its ends the passage is provided with an outlet
port 10 that extends outward through the partition and
the cylinder. The port communicates with a hollow
?tting 11.
Disposed in the upper and lower chambers of the valve
housing are fluid pressure responsive means, each of
valve for directing ?uid through either one of two cir
which may include a ?exible diaphragm or piston. Pis
cuits, in which the transfer from either circuit to the
tons 12 and 13 are illustrated, each of which preferably
other is made gradually without any interruption of ?ow, 15 is cup-shaped. Each piston separates an end chamber
in which thegrate of movement of the valve during the
into inner and outer sections 14 and 15. The valve
transfer is controlled by the rate of ?uid movement into
housing is provided with an inlet port 17 (FIG. 3) that
and out of it, and which is quiet and positive in operation.
opens into the upper inner chamber section 14, and with
In ‘accordance with this invention a valve housing con
another inlet port 18 ('FIG. 4) that opens into the lower
tains a pair of spaced end chambers connected by a cen 20 inner chamber section 14. A tubular ?tting 119 is con
tral passage of smaller diameter that is provided with a
nected with port 17. Preferably, a T-?tting 20 is con
lateral outlet port. Each end of the passage has a valve
nected to the lower inlet port, although the same result
seat in the surrounding chamber. Fluid pressure re
could be obtained by providing the lower part of the
sponsive means are mounted in the chambers for move—
valve housing with an outlet from lower inner chamber
ment toward and away from the valve seats to close and 25 section 14. To permit the housing to be made as short
open the ends of the passage. The pressure responsive
as possible, parts of partition member 6 at the inner
means, which are provided with central openings, sep
ends of the inlet ports are cut away so that the ports
arate the chambers into inner and outer sections. The
can overlap that member without ‘being obstructed by it.
valve is provided with by-passes permanently connecting
_ When a valve seat 8 or 9 is engaged by a piston, that
each inner chamber section with the adjoining outer cham 30 end of passage 7 is closed. Piston 12 has a central open
ber section. The valve housing has two inlet ports, each
ing 21 through it, and piston 13 is provided with a slightly
of which opens into one of the inner chamber sections.
larger central opening 22. Each piston also has a by
In one outer chamber section there is a movable closure
pass hole 23 through it outside of the adjacent seat, for
member for the central opening in the adjacent pressure
permanently connecting the adjoining inner and outer
responsive means, against which the closure means is 35 chamber sections '14 and 15 as will be explained presently.
pressed by a spring while that pressure responsive means
The same result could be obtained by substituting, for
engages the adjacent valve seat. A rigid tube in the
the by-pass hole, clearance between the piston and side
central passage has one end joined to the other pressure
of the housing.
responsive means around its central opening. The op
In the upper outer chamber section 15 there is a valve
posite end of the tube is smaller than the closed central
member, preferably a plunger 25, ‘for closing the central
opening and is located adjacent the closure member while
opening 21 through the upper piston 12. The plunger
the other pressure responsive means is spaced the maxi
is connected to a solenoid core 26 slidably mounted in
mum distance from the nearest valve seat. The tube
a sealed tube 27 sealed in cap 3 and encircled by an
has a central lateral outlet. A valve member in the
electric coil 28. The core is urged toward the opposite
other outer chamber section is operable to close the cen 45 end of the valve housing by coil springs 29 and 30 en
tral opening in the adjacent pressure responsive means
to cause the latter to engage the adjacent valve seat.
circling the lower end of the core.
'
Inside the lower outer chamber section 15 there is a
The tube is long ‘enough to push the closure member out
check valve for central opening 22. The check valve
of opening-closing position when said other pressure re
includes a closure member 32 and a coil spring 33 for
sponsive means, is seated against its adjacent valve seat. 50 urging it toward piston 13. While the piston is en
The invention is illustrated in the accompanying draw
gaging valve seat 9, opening 22 is closed by this check
ings, in which:
'
valve. Extending through central passage 7 directly
FIG. 1 is a plan view of our valve;
above the check valve is a rigid tube 34, the upper end
FIG. 2 is a side view;
of which is secured to upper piston 12 around its central
FIG. 3 is an enlarged vertical section, taken on the
opening 21. The lower end of the tube is small enough
line III—III of FIG. 1 showing the movable members in
to be projected through lower opening 22 and into en
one position;
gagement with the check valve. The tube is provided
FIG. 4 is an enlarged fragmentary vertical section,
centrally with one or more lateral outlet holes 35 open
taken on the line IV-IV of FIG. 1 at 90° to FIG. 3
ing into the surrounding passage. The top of piston 13
showing the movable members in the other position;
may be provided with a sleeve 36 extending up into
FIG. 5 is a horizontal section, taken on the line V-V
of FIG. 3; and
passage 7 to help guide the tube as it moves in the
piston.
FIG. 6 is a horizontal section, taken on the line VI—VI
The normal position of the valve, in which solenoid
of FIG. 4.
coil 28 is not energized, is shown in FIGS. 3 and 5. In
Referring to FIGS. 1 to 6 of the drawings, in which 65 that position, plunger 25 closes the central opening 21
the valve is shown vertical for convenience of descrip
through the upper piston so the ?uid pressure in upper
tion, a vertical cylinder 1 is closed at its lower end by
chamber section 15 above the piston holds the piston
a bottom cap 2, and is closed at its upper end by a
top cap 3 and the lower part of a solenoid mechanism 4.
on seat 8 because the ?uid pressure is less in passage 7.
At the same time, tube 34 holds closure member 32 down
The inside of the housing thus formed is separated into 70 away from the central opening 22 in the lower piston
upper and lower end chambers by means of a central par
13, whereby lower chamber section .15 is in communica
tition member 6 ?tting tightly in the housing and through
tion with the inside of the tube through holes or notches
3,030,981
3
4
We claim:
1. A diverting valve comprising a housing containing
‘a pair of spaced end chambers connected by a central
37 in its lower end and, by means of holes 35, with the
lower pressure in outlet port 10. If there is clearance
between the side of the tube and sleeve 36, notches 37
are not necessary. Since the ?uid pressure in lower
chamber section 15 now Will be less than in lower cham
ber section 14, the lower piston 13 will sink to the
bottom of the valve housing and thereby open the lower
end of passage 7. At this time the ?uid therefore en
ters one end of the T -?tt-ing 20 and is diverted through
passage of smaller diameter provided with a lateral out
let port, each end of said passage having a valve seat in
through elements (not shown) outside of the valve and
outer chamber section, said housing having inlet ports
opening into said inner chamber sections, a movable
the surrounding chamber, fluid pressure responsive means
mounted in said chambers for movement toward and
‘away from said seats to close and open the ends of said
passage, said means separating the chambers into inner
lower inlet port @18 into lower chamber 14, and then 10 and outer sections and being provided with central open
ings, the valve being provided with by-passes permanently
up into central passage 7 and out through outlet port
connecting each inner chamber section with the adjoining
10. The circuit from the other end of, the T-?tting
back to inlet port 17 is shut off by piston 12 at seat 8.
When the solenoid coil is energized, core 26 is drawn
upward to remove plunger 25 from central opening 21
in piston 12. With the opening of upper chamber sec
tion 15 in this manner, the pressure above the upper
piston is reduced and the piston rises to the top of the
closure member in one of said outer chamber sections,
a spring causing said closure member to close the cen
tral opening in the adjacent pressure responsive means
while the latter engages the adjacent valve seat, a rigid
tube in said passage having one end joined to the other
housing. Simultaneously, the raising of tube 34 permits 20 pressure responsive means around its central opening,
the opposite end of the tube being smaller than said
the check valve to close, so the fluid pressure below the
closed central opening and being located adjacent said
lower piston is increased to move it upward to close the
closure member while said other pressure responsive
lower end of passage 7 as shown in FIG. 4. Fluid there
means is spaced the maximum distance ‘from the nearest
fore can no longer enter the valve housing through lower
vinlet 18 to be short-circuited through the valve, so it ?ows 25 valve seat, the tube having a central lateral outlet, and
a valve member in the other of said outer chamber sec
straight through the T-?tting as shown in FIG. 6 and
tions operable to close the central opening in the ad
around to upper inlet port 17, and then down through
jacent pressure responsive means to cause the latter to
the center passage to outlet port 10.
When the coil is de-energized again, gravity, or springs
29 and 30, will cause plunger 25 to close the central open
engage the adjacent valve seat, said tube being long enough
30 to push said closure member out of opening-closing po
ing through the upper piston and simultaneously open
the check valve in the lower piston. The valve then will
reverse itself to return to the position shown in FIG. 3.
sition when said other pressure responsive means is seated
against its adjacent valve seat.
2. A diverting valve according to claim 1, in which
each of said pressure-responsive means includes a piston
The by-pass holes 23 through the pistons permit the
fluid pressure in inner chamber sections 14 to be trans 35 slidably mounted in the surrounding end chamber, said
by-passes being openings through said pistons outside of
mitted to outer chamber sections 15. The holes are large
said valve seats.
enough to permit the pistons to move at the desired speed,
3. A diverting valve according to claim 1, in which
but not so large that either one would short-circuit the
the tube-carrying pressure-responsive means is movable
of opening its center hole, because in that case the piston 40 through a greater distance than the other pressure re
sponsive means.
would not move. The valve changes gradually from one
4. A diverting valve according to claim 1, in which a
position to the other without any ?ow interruption to
stub tube projects into said central passage ‘from around
cause water hammer, so quiet and positive operation
said closed central opening and receives the adjoining end
are easily achieved. One circuit opens gradually at the
same rate that the other is closed.
45 of said rigid tube.
Although the valve has been described as if the sole
References Cited in the ?le of this patent
noid mechanism were at the top, the valve will operate
satisfactorily in any position. It is very compact, as all
UNITED STATES PATENTS
pressure imbalance created across a piston at the moment
moving parts are concentric with one another.
According to the provisions of the patent statutes, we 50
have explained the principle of our invention and have
illustrated and described what we now consider to rep
resent its best embodiment. However, we desire to have
it understood that, within the scope of the appended
claims, the invention may be practiced otherwise than
,as speci?cally illustrated and described.
2,460,908
2,589,859
2,927,606
Scott _________________ __ Feb. 8, 1949
Phillips _____________ __ Mar. 18, 1952
M-atchett ____________ __ Mar, 8, ‘1960
1,110,895
France _____________ .._ Oct. 19, 1955
FOREIGN PATENTS
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