Note: Descriptions are shown in the official language in which they were submitted.
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Pump-Protecting Armature
The invent~ion relates to a pump-protecting armature
having an armature hou6ing, further having a punp
connecting branch dispo~ed in a primary ~low direction, a
feed-water connecting branch opposite rhe pump ~onnecting
branch, as well as a bypas~s branch di~posed rrans~er~ely
to the prirrLary ~low direction and a mounting-pl~ate cap
oppo~ite the bypass branch, betwee~n which a chock-valve
disk is seated, possibly spring-ln~e~, on a valve spindl~ :
so as to be di-~placed with re~pect to a valv~ ~eat
oppo~lta the mounting-plate cap, with the chec~-valve diQk
actuating an a~ lea~t single--~tage throttle va~ve coaxial
~o the val~e disk, the valve being:-completely open when
the check-valve disk is closed and producing a ~ypas3 from
t~e pump-connection ~ide to the bypass branch.
High pre6sure6 can occur in 6uch pump-pro~ecting
armat~re~ or valve~, which are known in variow
:embodiments, for example from D~3 g4 22 7~9 C2; a
disadvantage o~thi~ is that, becau6e o~ the ~eating of
the ~alve spindle with~throttling bodies in the armature
housing, the valve spindle~ can break of~ or loosen from
their seat (holding device) and fall down in the armature
housing, causing~alfunctjo~;n~. ~
DiQposed a~ the valve pindle i~ one or a plurality
of coaxial throttling bodies ~erving ln ~hrote,ling the
pre~3ure on ~he inflow side when the control armature~is
closed and the thro~tling valve (bypass ~alve~ is open.
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The disadvantage of ~his arrangemen~ is tha~ the
thro~tling bodie~ cannot have an arbitrarily-large size,
because the orces effec~ed by the val~e ~pindl~ would
reach an unacceptable magnitude Furthermore, ~t i8
disadvantageous that, when the pump is ~witched of$, the
medium can flow back out of the bypass branch disposed on
the di~charge 6ide a~ the ~hrottle val~e.
It ls ehe object of the inven~ion to improve a pump-
protecting armature ha~ing the design mentione~ at the
outset such tha~ the valve ~pindle ha~i~g throttling
bodie~ i~ secured in its poaition in a simple and cost-
effective ~n r, which increaseE the reliability and
safety of the armature and a~oids malfunctioni~g.
In accordance with the invention, this ob~ect is
accompli~hed in that a safety stop for limi~ing ~alls;
which iq dispo~ed in:the bypa6s ~ranch, i~ assQciated with
the end side (lower end) of the val~e 3pindle having one
ar more throttling bodiee.
The derend~nt claims disnlose design fea~ures that
represent ad~antageou~ and beneficial modifica~lon~ of the
~ol~ion, in different variations.
A ~ignificant~advantage attained with th~ ~afety stop
of the inven~ion, which is aQsociated with th- end side of
valve spindle having throttling bodie~, is tha~ the valve
~pindle cannot fall into ~he bypa~s branch after loo~; ng
from its holding de~ice or being damaged, bre-king o~ or
the like, but the discance i~ can fall is limited, and i~
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iB caught by the s~op, which precludes malfunct~.oning, and
the throet}ing bodies continue ~o be held with ~
sufficien~ flow-through ~pacing from the throttle tage~.
Thi6 safety stop i~ formed:from simple co~conent~,
and can be embodled in the form of constriction~ in the
control bl~hin~ of the bypas~ valve, through th~ insertion
of perforated di k or perforated baskets into the control
bll.ch~ n~ or in~o a separate, ~econd control bushing:, by
di3ks, etc., and is alwayQ fipaced beneath the la t
throttling-body s~age. ~Pin~ and piston~part~ ~f the valve
~apindle can also cooperate with the safety StO~.
With respect to the valve spindlo~and~the throttling
stages, the diameter of the thro~tling bodie~ elected
such that the recoil ~orces on the main valve body ca~ be
kept mall. ~The throttling ~odies should not ha~e an
exceesively-large diameter so ae ~o l~mit the recoil
o~ce~ on the check-valve di~k, : -
a) for keeping material stre~e6 at ehe val~e spindle
: f~rom bec~ g exce~sive in th- smalle t Cro~s
~ ection, and~
b) ~or keeping the pressure loss in the :main ~low as-
small a~ posslble.
On the other hand, ho~ever, the recoil fcrce~ must belarge enough to as~ure a proper re~toration o~ the check-
val~e disk.
A further advantage~is the use of a le~e~ mec~n;.sm
in connection with the throttling bodies and ehe bypa~s
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valve as a building block that permlts easy:as~embly and
has a positive influence on the safety o~ the armature
function.
A further advantage i3 the friction dalnpi ~ , which i~
formed by a mecha~ical, s-lf-ad]u3ting friction-damping
element or a hydraulic friction damper surrolln~ the
val~e ~pindle above the~check-valve disk, and acting on
the disk. ~
Another advantage i3 the ~ hoA~lnent of th- throttle
valve (~ypass ~alve) wlth a piseon mounted to the valve
epindle, whLch pi ton extend3 into a control~bushing
acting a~ a safety stop, wi~h the e~fec~ of a pi ton valve
or a partially-re}ieved bypass valve re~ulting from the
cros6-section ratios between the piston and the control
bu-~hing and a bore ext~n~ing in the ~alve 6pi~dle.
The drawings illu~trate variatione of an ~mbodiment
of the invention, which~will be explalned in detail below.
9hown are~ in:
Fig.~l a longitll~in~l sec~ion thro~gh ~ pump~- ,
protecting armature having a hou~ing with a
pump~connecting branch, a feed-water
connec~ing bra~ch opposite the pump
connecting branch, a che~ck-val~e disk
cooperating with a ~alve ~eat, a bypa s
branch having a thro~tle valve-and oriented
transver~ely to the branches, ~nd a single-
stage throt~ling body dispo~ed at a valve
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splndle and a safety ~top formed by a
con~triction in the throttle val~e for the
val~e spindle having a ~hrottlin~ body;
Fig. 2 a longitudinal ~ection through the pump-
procecting arma~ure having a sa~ety stop
~ formed by a perforated di6k;
Fig. 3 ~ a longitl~;n~l section through ~he pump-
protecting armature having a safe~y stop
f~rmed by a disk;
Fig. 4 a longit~ldi~l section through the pump-
protecting armature ha~ing a sa2ety ~top
~ormed by a perforated dls~, with which a
spring-loaded clo ing diQk is a~sociated;
Fig. 5 a 1onglt~i n~l s~ction through the pump-
pro~ecting armature having multl-stage
-throttling bodies and a perforated di~k a~
a 6afety top;
Fig. 6 a longit~l~;nAl ~ection through the pump-
protecting aXmature having a sa~ety 2top
- formed by a perforated ba~ket that has
guide and support pins;
Fig. 7 a longitll~i~a~ Bection through the pump-
proteccing armature ha~ing a sa~ety stop
formed by a perforated ~asket and
cooperating with a pin tha~ iB exrended at
the lowermo6t ~hrottling ~ody, the armature
~urther having a spring-loaded, ~eparate
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throttling body and an addi~ional
perforated disk;
Flg. a :a longit~in~l 6ection through the pump-
protecting armature corre p~n~ tO Flg.
7, but without a perforated disk;
Fig. 9 a section through the pump-prot~_ting
armaturc having a~safety stop formed with a
perforated di~k and a spring-loaded valve
~pindle~having thro~tling bodie~ tha~ i~
~supported on th~ per~ora~ed di6~;
Fig. lo a longitudinal sec~ion through the p~mp-
protecting armature having a safety ~~op formed
by a perforated basket and additiona~ throt~ling
bodie~ thae are displaceable, with s~ring
loading, on a guide and support pin of:the valve
~pindle;
Fig. 11 a longitudinal Ecction through the pump-
prorecting armature ha~ing a perforated basket
~a~ a sa~ety ~top and a compres~ion pring
di6posed between the perforated bask-t and the
throttling body;
Fig. lla an enlarged 6e~ion from Fig. 11;
- Fig.-12 a longitudinal section through ~he p~mp- ~
protecting armature having a second control
bl~hing, which forms ~he ~a~ety s~op and a
piston of the valve 6pindle tha~ ext4nds into
the bushing;
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Fig. 12a an enlarged section from Fig. 12;
Fig. 13 a lo~gitudinal 6ection through the p~p-
pro~ecting armature having a second c~ntrol
bushing a3 a ~afe~y ~top and a ~prin~-loaded
pi3ton of the val~e spindle, and a -~elf-
adjusting fric~ion ~m~er surroundln~ ~he val~e
spindle and acting on the valve disk;
Fig. 13a an enlarged section:from Fig. 13;
Fig. 14 a longitl~i n~ 1 ~ection ~hrough ~he pump-
proteceing armature having hydraulic damping;
and
Pig~ 14a an enlarged section from Fig. 14.
The armature hou~ing ~1) of a pump-protec~ing:
armature ha~ a pump connecting branch (2) disposed in a
main flow direction (R), a ~eed-water connectiAg branch
(3) di~posed opposite the pump conne~ting bran~h, a bypass
branch (4) dispo~ed~transv-r~ely tc the ~ain f~ow~ :
dlrec~ion (R) and a moun~ing-plat- Cdp ~housir~ lid) (s)
opposite the bypass branch ~4). Between the m~unting-
plate cap (5j and the:bypa~s branch ~4), a check-valve
disk (7) i~ ea~ed, possibly spring-loaded, to be
di~placed~with a ~alve 6pindle (6) with re~pect to a val~e
seat (8) opposite the mount~ing-plate cap (5). The check-
valve disk (7) io coupled to a throttle valve ~!9) that is
coaxidl to the diSk and has at least one stag~. ~he valve
being completely open when the check-valve di~k ~7) is
closed, and prdduclng d byPa~ (10) ~rom th~ pun~p-
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connection side (2) to the bypass branch (2) ~ic]. A
safety stop (SA) for limiting falls, which is disposed in
~he bypa~6 branch ~4), i~ associated wleh the ond side
(lower end) of ~he valve spi~dle (6) having ono or more
throttling bodies.
The throt~le valve (9) has a control bushing (12)
that i~ secured in the bypass branch (4), the ~.q~l n~
forming single- or multi-stage cascades (~) wlth the
throttle body (bodies) (11) loca~d therein. -~he safety
9top (SA) according to Fig. l is formed by a ccnstriction
~13) of the control bushing (12) secured, pref~rably
screwed, in the bypass branch (4), the con~triction ha~ing
a smaller dia~meter than the throttling body (11); in the
region of the constriction (13), the control h~ n~ (12)
has on the inside flow-through chAnn~ 14) t~at extend
in the ~ypa~-flow dlreccion, and permit a byp~s~ flow for
avoiding mal~unctioning in the armature when the valve
spindle ~6)~ha ~allen with a throttling body ~ll)
di posed i~ the constriction (13).
The cafety stop ~SA) accordlng to Fig. 2 ~9 formed by
a perforated di~k (15) ~ecured in the bypass branch (4),
beneath the control bll~h~; n~ (12).
In accordance wlth Fig. 3, a second, do.~ d-
projecting ~control b~sh;n~ (16) is inserted, preferably
scre~ed, into the control bu3hing (12), with a disk (17)
being:ln~erted, with a sealing e~ ect, a~ a saSety stop
(SA) i~to the second control bushing. The valve Qpindle
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(6) ha~ two throttling bodies (11) and, at i~s lower end,
a piston (18) having axial flow-~hroug~ ch~nnPls (19) ~ the
pi~ton being fornted onto the val~e spindle ~6) ~s a
further throttling body. The second con~rol bushing (16)
has on it8 jacket side flow-through openings (~0), which
are closed by the pisto~ (18) when the throttle ~alve (9)
i~ closed.
In accordance with Fig. 4, ~ the safety st~o~ (SA) is
formed b~ a per~orated disk (22) that rest~ against the
lower end f ace of the control bus~,ting ( 12 ) and i6 held in
a shoulder (21) of the bypa~ branch ~4)S bene~h the
perfora~:ed :di6k (22) is ~a closing di3k (23) th~c i8
axially~movable with re pect ~o the perforated disk into
th- position that enables and blockq ~he flow-through by
meanq of a cap bolt:(24) that i:s ~ecured, pref~rably
riveted,~to the pcrforated disk (2~), and by mean~ of a
compression ~pring (25) ~urrounding ~he cap bo~t. The
~valve spindle (6) has three thrott:ling bodle ~11) that
are spaced axially one h~ the other, and ef~ect three-
stage cascada6 ~K).
-The cascade~ (K) are formed by annular constriccions
(26) of the control btl.sh~ (12), which are ad~pted in -
diameter to the throttling bodie ~ll) and for~ the valve
~eat for the throttling body (11). One thro~t~ing ~ody
(11), ~pecifically the lo~ermost or uppermo~t throttling
body ~ll), cooperateg with a valYe seat ~26) in the clo~ed
position; the other throt~ling bodies (ll) have no closing
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function, but lie with a loo~e fit in the control bushing
~12).
In the further embodiment according to ~iq. S, a
per~orated disk ~2'~ inserted aB a safety stop (SA~
into the control b~sh~ l12~ and held thereln ~y a
retaining ring (2fi). The end-side throttling body (11)
has an axial pin (29), which is surrounded by a
co~pression spring (30) ~upported on the perfor~ted disk
: (27) and against the throt~ling body ~11).
In accordance with Fig. 6, a cup-shaped, per~ora~ed
ba~ket (32) ha~ing on its jacket and botrom si~es flow-
through openings (31) i-~ ~ecured to the lower ~nd of the
control bushing (12); this basket support~ a c~tral guide
and support pin ~33~,: which ~orms the safety s~p (SA),
around which the two 3uperposed, spaced, separ~te
throttling bodies ~35), which are re~pectively ~cted on by
a compression pring (34~, and:reqpective1y have a valve
eeat ~35a), are seated so as to be di placed ir.to a c10sed
and an open position.
A cup-shaped, perforated ba~ket~(32) havir.g flow-
through oren1n~s ~31~ on its jacket and bottom ~ides i~
1ikewise secur~d as a sa ety ~top (SA) at the ~ower end of
the control b~ n~ (12) according tO Flg. 8, ~nd the
lowermo~t throttli~g body (11) has an axial, downward-
ext~Ai-l~ pin (36) provided with~ a~ collar (37) that is
screwed onto the ide of the free end; seated ~round the
pin ~36~ ~o as ~o ~e axially dispIaced in~o an open and a
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closed posicion is a 6eparate throttling body ~3S) that i~
acted on by a co~pre~s~ion spring (34) and has a valve seat
(35a).
A perforated disk (38) can additionally be secured
with ~pacing beneath the perforated bot:tom (32a) of the~
perforated ba.~ket (32) ~(Fig. 7).
The e~boAlment according to Fig. lO corr~ o~d.~ to
the embodiment according to Fig-. 8, but the ~eparate
throttling body (35) ha~ cwo val~e seats 135a) -~isposed
one hek;~d the other in the axial direction.
In accordance with Fig.:9, a perforated di6k (27) is
in~ertcd a-~ a ~afety stop (SA~ into the contro~ bu~h;
(12) and held therein by a retA~in~ ring (~B); the
lowermo~t throttling body (ll) :has a formed-on, axial
hollow pin (39), ineo which~a cG,-.~easion pri~g (40)
~uppor~ed o~ the p-rforated disk (27) extend6.
In accordance with Figs. 1l and lla, a cu~-6haped,
perforated basket (41) having flow-through ope~ings (31)
on it8 j acket and bottom sides i~ ~ecured as a 6afe~y stop
~(S~) benoath and at the control bllQhin~ ~l2)~ ~referably
screwed with a~sealing ef~ect onto the control b~h~
(12); between the cup botto~ ~3~2a) o~ the perforated:
basket :(32) and the:lowermost throttling body ll~ i~ a
compre~sion spring ~40) that i~ ~upported on the cup
~octom ~32a) and in a-hole (~l) of the ~hrottll.ng body
(11) . -
In ehe further ~aria~ion according to Fig-. 12 and
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12a, a second cup-shaped control b~q~n~ (42) 12~ving flow-
through openings (42a) on i~s jacket side iQ ~-cured ae a
eafety stop (SA) at the control bushing (12); a piston
(43) formed onto the lowermoet throttling body (ll), ~ith
the int~rpo3ing of a compreesion spring ~40), ~xtends into
this control bushing ~o as ~o be axially di~pla ed, with a
~ealing effect, with~reapect to the oecond con~rol bushing
(42~.
~ igs. 13 and 13a 6~0w a socond cup-ehaped control
bushing (42) that hae:~lo~-through or~ s ~42a) on ite
jacket ~ide and i~ ~crewed, with a 6ealing effect, onto
the first concrol buehing (12).
The valve ~pindle (6) displaceably extend~ ineo the
- second control- bllQhln~ (42) with a piston ~4~) that i~
secured to a valve-~pindle pin ~44a) with spac~ng from ~he
lowermost throttling body (11), with ehe 1~terposing o~ a
compression spring (4 o ) ~ ~
In rhe valve-spindle pin (44a), an axial ch~nn l (54)
extendg ~rom the lower, free pin end face proj-cting
beyond the piston (44), from which ch~nnel an ~xit bore
(54a) ~hat i~ emaller in diameter extends~laterally from
above the piston (44).
The further e~oA;~nt according to Figs. 14 and 14a
:corresponds to t~e ~ho~ment aocording to ~ig~. 11 and
lla, with a second cup-shaped control bushing ~32) that
ha~ flow-through apenings (313 on it jacket a.qd bottom
~sides likewis~ being ~ecured to the control bUi-hin~ (12)
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addicionally, a perforatcd dlsk ~38) i~ in6ert~d as a
~afe~y stop ~SA) into thi6 control bushing, with 3pacing
above the cup bottom (32a), and a compression ~pring ~40)
supported on the perforated di~k (38) a~d in a blind bore
(gl) of the throttling body (ll) i9 disposed b~tween the
perforated di~k (381 and the lower ehrottling ~ody lll).
At the moun~ing-plate cap (5~, a pivotally-seated
lever mechanism ~H) is coupled to the throttle val~e (9j
via ~he check-valve di~k (7) ! and the lever meehani~m (H)
and the throttle ~alve (9) are connec~ed to form a unit.
Surroll~A~n~ the valve ~pindle (6) i~ a self-adjusting
friction damper (~D), which coopera~es with th~ check-
val~re diek ~7) and coTnprise~ a cup housing (45 3 detachably
ee~cured to th~ check-valve di~k t7) by meane o~ a flange
joint (48) and~plastlc ~unk ring~ (47), which are disposed
in the hou~ing ln a roo~ shape~an~ are held wir,h
prestressing oppo6ite t~e check-valve di3k (~ with the
interposing of a compree ion spr1ng (46) (Figs 11, lla,
12, 12a,; 13, 13a).
Fig~. 14 and 14a show a hydraulic damper ;HDi ~
comprising a pistQn ~50~) t~at is provided at~ the control
bushing (12), i~ seated around the valve spind~e (6),
extends lnto a valve bore ~49a) o~ the check-~alve di~k
(7) ~o aR to be axially di~placeable, with a 3ealing
effect, and i~ self-deventilating.
In ~e ~ho~;ment~according~to Pigs. 12 and 12a, the
aelf-adjusting, spring-loaded friction damper (RD) formed
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. .,
from junk rings:(47) is a3sociated with the ch-~k-val~e
disk t7), and the pi~ton (43) o~ the throttlin~-body ~alve
spindle (6) that extend~ into the second control bushing
142) scre~ed on~o the control b~ h;~g (12~, an~ is under
6pring ten6ion (~0), i~ associated with the thr3ttle val~e
(9) as a hydraulic damper (HD); exten~jn~ in ~h piston
(43) and in the throttling bodies (ll) is a lo~g
connecting chA~nel (51), which lead~ from tho c~nrrol
bl-~hi n~ (42) and exi~s the control bu~hing (12) by way of
a bore (52) that ha~ a smaller cros~ section, ~ith
identical preçsure raeios pre~o~ln~tlng in the ~pace (53)
between the piston (4~) and the control bl~Ahlng (42), and
in the connecting ~h~nnel ~51, 52), the objective being to
keep the recoil force ~mall. :
The d~rer (HD) effects par~ially-relieved ca cade~
(K), and the:difference between the largest width o~ the
throttling body (11~) and the lower end face of the piston
(43) results in~a partia~l relief of the entire ~hrottle
valve/bypa~ valve (9).: :
In accorda~ce with Fig~. 12, 12a, the fric~ion damper
(RD) i~ scY~ d ineo the valve disk (7).
The self-adju~tlng friction ~Am~er ~RD) ~ serves in
preventing vibrationq of the check-valvè di~k l7).
The spring (46) holds the plastic ~unk ring~ (~7)
under stre~ss, and automati~ally adjusts the- fr~cti~n
damping a~ wear occur .
In the e~bodiment accordlng to Fig~. 13 ar~d 13a, che
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last stage ~throttling bQdy ~1 with piston 44) ~perate as
a piston ~alve, with the rellef being effected ~ia ~he
ch~n~el (54)~extending wi~h the bore (54a) in the valve-
6pindle~pin (44aj, thus effecting an additiona- hydraulic
damper.
In the ~hoAiment according eo Figs. 3 and 13, the
stop disk~ ) and the piston (18), and the bottom of the
perforated basket (42~ and the pi n (44~, re~pectively,
form a pre ure-relieved piston valve; here th~ piston
(18, 44) ~an have an arbitrary diameter without addi~ional
force being exer~ed on the lever ~e~nlQm ~H), and thus
on the throt~ling body (11~. The~perforated dl~ks (15,
22, 27,:38~ and the per~rated baske~s (32, 42~ likewise
~orm throttling ch~nnPls for the~bypas~.
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