close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3080154

код для вставки
March 5, 1963
J. D. BAKER
3,080,144
ANTI-SCORING VALVE
‘
Filed Dec. 24, 1959
2 Sheets-Sheet 1
Fug . I.
l5
4 I
i
1 :5
-
l6
I:
v
'2
-
I
,
IO
‘L
I
.
I
|
ll
—
l2
l3
,
—'~——
I
1
|
-
'
1
_
INVENTOR
James D. Baker
%
MIWQ W
March 5, 1963
J. D. BAKER
3,080,144
ANTI-SCORING VALVE
2 Sheets-Shee’r. 2
‘Filed Dec. 24, 1959
1/,l7é2mwa! /
Fig.3.
2b
INVENTOR
James D. Baker
@MW
United grates
ice
‘are atent
1
3,080,144
ANTI-SCORING VALVE
James D. Baker, Erie, Pa., assignor to Blew-Knox Com
pany, Pittsburgh, Pa., a corporation of Delaware
Filed Dec. 24, 1959, Ser. No. 861,833
7 Claims. (Cl. 251—-121)
This invention relates to valve structure and more par
3,080,144
Patented Mar. 5, 1963
2
means operatively connecting the operating element with
the valve element to predeterminedly control the ulti
mate open position of the valve element upon a move
ment of the operating element of said predetermined
amplitude. The operating element may be a pivoted
arm having a pivotal movement of predetermined am
plitude, and I preferably provide an adjusting screw con
nected with one of ‘said arms and the valve element and
engaging the other thereof to predeterminedly control
ticularly to valve structure provided with means sepa
rate from the seating portion of the movable valve ele 10 the ultimate open position of the valve element upon a
pivotal movement of the arm of said predetermined am
ment but connected and movable therewith and operable
when the valve is open to control the ?ow of ?uid through
Desirably the valve seat‘ is removable and replaceable
the valve. The invention further relates to valve structure
in the casing. I prefer to employ a removable and re~
designed to minimize wear on the valve seat by ?uid
traversing the valve when the valve is open and having 15 pl'aceable element comprising the valve seat and said pas‘
sage, the latter being preferably of generally funnel shape.
means connected and movable with the movable valve
The passage in the casing may be disposed'relatively
element to accomplish that function.
to
the valve seat in the direction in which thevalve ele
My valve structure has various uses such, for example,
ment
moves relatively to the casing upon opening of the
as to control steam flow to a soot blower. in the use of
valve. Alternatively the passage may be disposed rela
a soot blower it is necessary from time to time to in
tively to the valve seat in the direction opposite the direc
crease or decrease the quantity of steam per unit of time
tion in which the valve element moves relatively to the
passing through the blower. This has heretofore been
casing upon opening of the valve. In the former case
done by using a set of ori?ce plates and substituting one
the throttling portion of the valve element is preferably of
plate for another to alter the steam ?ow. Such -a pro
greater diameter than the seating portion thereof and in
vision was not entirely satisfactory because of the time
the latter case the throttling portion of the valve element
and labor required to change ori?ce plates. It has also
is preferably of smaller diameter than the seating portion
been proposed to employ a ?ow control member separate
thereof. Also in the latter case the portion of the valve
from the movable valve element and adjustable rela
element between the seating portion and the throttling por
tively to a portion of the ?uid passage but that structure
has not proved e?icient in use; moreove'r,- its provision 30 tion is preferably concave in axial cross-section.
plitude.
has involved undesirable complexity of mechanism.
I provide a relatively simple yet highly effective valve
structure having means separate from the seating portion
of the movable valve element for controlling the ?ow
'
_
,
Other details, objects and advantages of the invention
will become apparent as the following description of cer~
tain present preferred embodimentsp'thereof proceeds. }
In the accompanying drawings I have shown certain
through the valve when the valve is open with easily
present preferred embodiments of the invention in which
I provide a valve structure comprising a casing having
FIGURE 3 is another diagrammatic fragmentary view
portion of the valve element and the proximate portion
seat 4 is discharged toward the right viewing FIGURE 1
through a discharge passage 17. Other elements forming
FIGURE 1 is a fragmentary axial cross-sectional view
adjustable means whereby the flow may be increased or
through valve structure embodying my invention utilized
decreased at will. The control of the flow at a zone
in a soot blower;
_
'7
remote from the valve seat results in reduction of wear
FIGURE 2 is a diagrammatic fragmentary view show
on the valve seat since the velocity of ?uid ?ow across 40
ing a modi?ed construction; and
the‘ seat is less than that at the control zone.
showing a further modi?ed construction.
therein a valve seat and a passage substantially coaxial
Referring now more particularly to the drawings, FIG
with the valve seat and a valve element in the casing
having a seating portion adapted to engage the valve seat 45 URE 1 shows a valve comprising a casing 2 having a
generally vertical inlet 3 through which steam or other
to close the valve and a throttling portion disposed rela
?uid from a suitable source is adapted to ?ow upwardly
tively to the seating portion so that upon movement of
under high pressure. The casing 2 has 1a valve seat 4
the seating portion of the valve element away from the
which is of annular shape and may be of relatively hard
seat when the valve is opened the throttling portion moves
ened steel having a generally conical face 5 against which
in said passage into a position in which the annular flow
the seating portion 6 of a valve element 7 is adapted to
area between the throttling portion of the valve element
seat to close the valve. The valve element 7 is carried
and the proximate portion of said passage is less than
by a stem 8 passing upwardly through a packing gland 9
the annular flow area between the seating portion of the
and normally urged upwardly by a compression coil spring
valve element and the valve seat.
Preferably my valve structure comprises a casing having 55 10 as shown in FIGURE 1. Thus the spring 10 normally
maintains the valve element seated to close the valve.
therein a valve seat and a passage of generally funnel
Pivotcd at 11 is an arm 12 having at its outer end a
shape substantially coaxial with the valve seat and a valve
roller 13 serving as a cam follower following a rotary
element in the casing having a seating portion adapted to
cam 14 forming part of the soot blower in which the
engage the valve seat to close the valve and a throttling
valve
is embodied. As the cam 14 rotates it causes the
portion disposed relatively to the seating portion so that 60 arm 12
to partake of pivotal movement about the axis
upon movement of the seating portion of the valve ele
of
the
pivot
11. A screw 15 is threaded through the
ment away from the seat when the valve is opened the
outer end of the arm 12 and maintained in adjusted
throttling portion moves in said passage in the direction
position by a lock nut 16. The lower end of the screw
from the larger to the smaller end thereof into a posi
15 engages the upper end of the valve stem 8 as shown
tion in which the annular ?ow area between the throttling 65 in FIGURE 1. Fluid passing upwardly past the valve.
of said passage is less than the annular ?ow area between
the seating portion of the valve element and the valve
seat.
part of the soot blower but having no relation to the.
I provide means for moving the valve element in the 70 present invention are not described.
I ‘The casing 2 has below the valve seat '4 a passage‘ '18
casing, ‘such means having an operating element having
which is substantially coaxial with the valve seat 4. The
a movement of predetermined amplitude and adjustable
3
3,080,144
valve element 7 has a throttling portion 19 which as shown
in FIGURE 1 may be below the seating portion of the
valve element and of substantially greater diameter.
Upon movement of the valve element downwardly view
ing FIGURE 1 away from the seat 4 the throttling por
tion 19 moves in the passage 18 into a position in which
the annular ?ow area between the throttling portion of
the valve element and the proximate portion of the
4
FIGURE 3 shows a modi?ed structure analogous to
FIGURE 1 except that in FIGURE 3 the inlet is from
the left as indicated at 3]). Otherwise the elements of
FIGURE 3 are analogous to those of FIGURE 1 and
bear the same reference numerals each with the letter “b”
appended.
It is to be understood that the means for operating
the valve element in FIGURES 2 and 3 may be the
passage is less than the annular flow area between the
seating. portion of the valve element and the valve seat.
same as in FIGURE 1; FIGURES 2 and 3 are purely
It will be seen that as the valve element 7 moves down
element with the throttling portion and cooperating pas
wardly viewing FIGURE 1 the seating portion 6 thereof
moves gradually farther and farther away from the seat 4
and the throttling portion 19 moves closer and closer
to the lower portion of the passage 13 so that the annu
lar ?ow area between the throttling portion of the valve
element and the proximate portion of the passage is less
than the annular flow area between the seating portion
diagrams to show di?’erent arrangements of the valve
sage whereby when the valve is open the flow is con
trolled by the throttling portion and not by the seating
portion of the valve cooperating with the valve seat. The
15 control of the ?ow is very simply effected by adjustment
of the screw 15 shown in FIGURE 1. The cooperating
valve elements are shaped so that the ?ow of the ?uid
through the valve is smooth, promoting high e?iciency
of the valve .element and the valve seat. This has the
While at the same time minimizing wear on the valve
advantage that the control of the ?ow of ?uid when the 20 seat and consequently greatly increasing the life of the
valve is open is at the throttling portion of the valve
seat and the seating portion of the valve and reducing
element and not at the valve seat and the velocity of
down time for valve and seat changes.
the ?uid is greatest at the throttling portion.
While I have shown and described certain present
The ‘arm 12 partakes of motion of predetermined
preferred embodiments of the invention it is to be dis
amplitude since it is controlled by a rotating cam. How 25 tinctly understood that the invention is not limited thereto
ever, by adjustment of the screw 15 the extent to which
but may be otherwise variously embodied within the scope
the valve stem and valve are depressed upon a pivotal
of the following claims.
movement of the arm 12 of predetermined amplitude can
I claim:
be determined as desired. Thus the valve may be adjusted
1. A valve structure comprising a casing having there
so that the throttling portion 19 approaches as closely
in a valve seat and a passage substantially coaxial with
as desired to the lower portion of the passage 18 to effect
the valve seat and a valve element in the casing having a
a desired degree of throttling or in other words a desired
seating portion adapted to engage the valve seat to close
control of the flow of ?uid through the valve.
the valve and a throttling portion disposed relatively to
While the passage 18 may be of various shapes I prefer
the seating portion so that upon movement of the seating
to make it of generally funnel shape as shown in FIG 35 portion of the valve element away from the seat when
URE 1. Making the passage of generally funnel shape
the valve is opened the throttling portion moves in said
not only facilitates ?ow control but insures a relatively
passage into a position in which the annular ?ow area
smooth flow of ?uid around the valve element.
between the throttling portion of the valve element and
While in FIGURE 1 the passage 18 is disposed rela
the proximate portion of said passage is less than the
tively to the valve seat in the direction in which the
annular flow area between the seating portion of the
valve element moves relatively to the casing upon open
valve element and the valve seat, said passage being dis
ing of the valve it is possible to dispose such passage
posed relatively to the valve seat in the direction in which
relatively to the valve seat in the direction opposite the
the valve element moves relatively to the casing upon
direction in which the valve element moves relatively to
opening of the valve.
the casing upon opening of the valve. Such a structure 45
2. A valve structure comprising a casing having there
is shown in FIGURE 2 in which the parts generally
in a valve seat and a passage of generally funnel shape
speaking are analogous to those of FIGURE 1 but the
substantially coaxial with the valve seat, a valve element
passage 18a is disposed above rather than below the valve
in the casing having a seating portion adapted to engage
seat 4a. The valve element 7a has an enlarged lower
the valve seat to close the valve and a throttling portion
portion providing the seating portion ea adapted when 50 disposed relatively to the seating portion so that upon
the valve element is moved upwardly to seat against the.
valve seat 4a. The throttling portion of the valve ele
movement of the seating portion of the valve element
away from the seat when the valve is opened the throt
ment in FIGURE 2 is at 19a.
tling portion moves in said passage in the direction from
, When the valve of FIGURE 2 is in closed position
the larger to the smaller end thereof into a position in
with the seating portion 6a seated on the seat 4a the 55 which the annular flow area between the throttling por
throttling portion 19a is disposed above the passage 18a
tion of the valve element and the proximate portion of
of generally funnel shape. When the valve element is
said passage is less than the annular ?ow area between
moved downwardly, as, for example, to the position shown
the seating portion of the valve element and the valve
in FIGURE 2, the seating portion 6a moves away from
seat and means separate from said passage limiting move
the seat 4a and the throttling portion 19a moves down 60 ment of the valve element in the direction in which the
wardly in the passage 18a until the valve element reaches
seating portion of the valve element moves away from
a position in which the annular flow area C-D indicated
the seat upon opening of the valve.
in FIGURE 2 between the throttling portion of the valve
3. A valve structure comprising a casing having there
element and the proximate portion of the passage 18a
in a valve seat and a passage substantially coaxial with
is less than the annular ?ow area A-B between the seat 65 the valve seat and a valve element in the casing having
ing portion of the valve element and the valve seat. The
a seating portion adapted to engage the valve seat to
portion 20 of the valve element between the seating por
close the valve and a throttling portion disposed rela
tion and the throttling portion is concave in axial cross
tively to the seating portion so that upon movement of
section as shown in FIGURE 2 promoting smooth ?ow
the seating portion of the valve element away from the
of ?uid through the valve.
70 seat when the valve is opened the throttling portion
In FIGURE 2 the casing 2a has therein a removable
moves in said passage into a position in which the annu
and replaceable element 21 which comprises the valve
lar flow area between the throttling portion of the valve
seat 4a and the passage 18a. The element 21 may be
element and the proximate portion of said passage is less
made of hardened steel and may be threaded into place
than the annular ?ow area between the seating portion of
in the casing by threads 22 shown in FIGURE 2.
75 the valve element and the valve ‘seat, the valve seat and
3,080,14a
5
passage being formed as a unitary element removably
mounted in the casing.
4. A valve structure comprising a casing having there
in a valve seat and a passage of generally funnel shape
substantially coaxial with the valve seat and a valve ele
ment in the casing having a seating portion adapted to
said passage is less than the annular flow area ‘between
the seating portion of the valve element and the valve
seat and means separate from said passage limiting move
ment of the valve element in the direction in which the
seating portion of the valve element moves away from
the seat upon opening of the valve, said passage of gen
engage the valve seat to close the valve and a throttling
erally funnel shape being disposed relatively to the valve
seat in the direction opposite the direction in which the
portion disposed relatively to the seating portion so that
valve element moves relatively to the casing upon open
upon movement of the seating portion of the valve ele
ing of the valve and the throttling portion of the valve
10
ment away from the seat when the valve is opened the
element ‘being of smaller diameter than the seating por
throttling portion moves in said passage in the direction
tion thereof.
from the larger to the smaller end thereof into a posi
7. A valve structure comprising a casing having there
tion in which the annular ?ow area between the throt
in a valve seat and a passage of generally funnel shape
substantially coaxial with the valve seat, a valve element
tion of said passage is less than the ‘annular ?ow area 15 in the casing having a seating portion adapted to engage
between the seating portion of the valve element and the
the valve seat to close the valve and a throttling portion
valve seat, the valve seat and said passage of generally
disposed relatively to the seating portion so that upon
funnel shape being formed as a unitary element remov
movement of the seating portion of the valve element
ably mounted ‘in the casing.
20 away from the seat when the valve is opened the throt
tling portion of the valve element and the proximate por
5. A valve structure comprising a casing having there
tling portion moves in said passage in the direction from
the larger to the smaller end thereof into a position in
which the annular ?ow area between the throttling por
tion of the valve element and the proximate portion of
said passage is less than the annular ?ow area between
portion disposed relatively to the seating portion so that 25 the seating portion of the valve element and the valve
upon movement of the seating portion of the valve ele
seat “and means separate from said passage limiting move
ment away from the seat when the valve is opened the
ment of the valve element in the direction in which the
throttling portion moves in said passage in the direction
seating portion of the valve element moves away from
from the larger to the smaller end thereof into a posi
the seat upon opening of the valve, said passage of gen
30
tion in which the annular flow area between the throt
erally funnel shape ‘being disposed relatively to the valve
tling portion of the valve element and the proximate por
seat in the direction opposite the direction in which the
tion of said passage is less than the annular ?ow area ‘be
valve element moves relatively to the casing upon open
tween the seating portion of the valve element and the
ing of the valve, the throttling portion of the valve ele
valve seat, said passage of generally funnel shape being
ment ‘being of smaller diameter than the seating portion
35
disposed relatively to the valve seat in the direction in
thereof and the portion of the valve element between the
which the valve element moves relatively to the casing
seating portion and the throttling portion being concave
in a valve seat and a passage of generally funnel shape
substantially coaxial with the valve seat and a valve ele
ment in the casing having a seating portion adapted to en
gage the valve seat to close the valve and a throttling
upon opening of the valve and the throttling portion of
the valve element is of greater diameter than the seating
portion thereof.
6. A valve structure comprising a casing having there 40
in a valve seat and a passage of generally funnel shape
substantially coaxial with the valve seat, a valve element
in the casing having a seating portion adapted to engage
the valve seat to close the valve and a throttling portion
disposed relatively to the seating portion so that upon
movement of the seating portion of the valve element
away from the seat when the valve is opened the throt
tling portion moves in said passage in the direction from
the larger to the smaller end thereof into a position in 50
which the annular ?ow area between the throttling por
tion of the valve element and the proximate portion of
in axial cross-section.
References Cited in the ?le of this patent
UNITED STATES PATENTS
217,745
1,000,455
1,903,816
2,605,107
2,685,294
2,746,471
Pringle ______________ .._ July 22, 1879
‘Studds _____________ __ Aug. 15, 1911
43,582
Germany ____________ __ July 5, 1888
Hanson _____________ .._ Apr. 18,
Glinn _______________ ..._ July 29,
Gold _______________ __ Aug. 3,
Cobb _______________ __ May 22,
1933
1952
1954
1956
FOREIGN PATENTS
Документ
Категория
Без категории
Просмотров
0
Размер файла
610 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа