Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
2(~18~
EXHAt~ S T VA LV r
The present invention relates to exhaust valves
comprising a valve housing, a valve seat formed
g thereln and a valve elemen~ supported by movable
supporting means ~or moving the valve element into
and o~ o~ sealing contact wlth t~e valve seat. The
.~nvention par~lcularly relates to exhaust valves of
~his ~in~ for use in the exhaus~ duct ~rom the en-
0 gine of a sub~arine.
One problem inherent ln exhaust valves is that
due to the flow of usua~ly hot exhaust gases through
the valve, dust particles and impurities tend to de-
posit on the sealing surfaces o the valve element
and the valve seat, and this gradially reduce~ the
sealing ef fect of ~he valve . In o~der to reduce the
amount of remaining deposit8 on the sealing surfaces
of the valve element and on the valve seat. it is
previously known in exhaust valves used in internal
combustion enginDs to impart to the valve ele~ent a
certain small rotary motlon in connection wl~h open-
in~ ~d ~ iA~ a~ ~h~ ~l~c, .~ ~h~ ~o~
' valve element moves into contact with the seat it
h~s been rotated a small angle in relation to the
~5 valve seat. Even if thi~ to a certain extent ~ay
have a cle~n~ng effect lt does not provlde such
grindlng effect as ob~ained by relative movemenc be-
tween the sealing surfa~es, and as re~uired in order
to eff~iently remove lmpur1ties which have adhe~ed
3~ to S~id sealing ~ur~aces. This may be one of ~he
reasons why the met~od men~ioned above has not been
~ractised in exhaust valves of the kind used in the
exhaust ducts of enaines of submarines. ~hen using
exhaust valves o~ ~his kind it has proved nece~s~ry
~o dismount the valve regularly at relatively sho~
zn~ 8
intervals and to carry out grind~ng of the sealin~
surfaces between the valve element and the valve
~eat by means of spe~ia~. grin{ling t.ools.
EP-A-O 226 l~J dis~loses a valve ~Ise~ in lines
~ox liq~ids containiI~y pa~ti.cles, sa.id v-a1ve co~-
prisirlg a valve housing, a valve seat formed therein
and a valve element movable i~l said ho~sing between
Opell position and closed posi~ion in e~lgage~ent with
the valve seat. l`he valve elenlent is connected to a
rod whic}l is axially displacea~le irl a cylin~rical
s:l.eeve for ItlOVinS7 t.h~ valve element L)etween open anc~
closed pO~itiOIIs. By means of a dr~ve motor said ~od
may be rotate~ to and fro for ~ransmittillg sald
rotary mo~io~ to the valve e1ement when ~he valve
15 ell~ent is i.n its closed posi.t10rl
znl~s6s
2~
One ob~ect of the ~resen~ inven~ion is ~o pro-
S vlde an exhaust valve of t2le kln~ men~ioned initial-
ly, ~n WhiCh an efficient grin~in~ action on the
sealing suraces between valve element and valve
sea~ is obtaine~ each time ~lle valve is opened and
closed, said grlncling action b~in~ obtaine~ by ~e-
0 la~ve move~nen~ be~ween the seallng sur~aces, saidsurfaces si.multaneously being urged towards each
other 2~ a predetermine~ pressure force. Another
ob~ect of the invention ir~ to prov~.de an exhaust
valve includihg me~ns ~hicll automa~icall~ provides
sai~ grindin~ action and ~hi~h is simple wit~ re-
spect to its design and which without difficultY may
be lrlcluded into t2~e supporting device used for mov-
in~ the valve element into and oùt of engage~ent
wlth the v~lve seat.
The objects mentioned above are obtalned by
means o~: a desl~n in accordance wi~l1 the appended
C 1 aims .
The inventlon will be described below wlth ~e-
ference to an embo~imen~ o~ an exl-aust v~lve of the
26 kin~ used in the exhaust ~et rr~ln tlle en~ine of a
submarine and Which iS ill~.ratefl on ~.he a~ended
drawing, on whlc2~
- fi~ 1 is a lon~i~udinal section thxough an ex-
h~ust valve in a~cordance with the invention, and
3~ - flg 2 is a section taken as indicated by I - I
in rig 1.
The exh~ust v~lve lllustrated in the ~iaures
include a subs~antially spherical valve housing 1
pxovlde~ with two pipe sockets 2 and 3 ~espectively
connec~ed wi~ll t2-e valve housina and extending ~o-
2nlss6s
axially wit~ respect to each other. The pipe socket2 extends a certain dis~ance into ~he valve housing
an~ terminates in~o a ci~cular valve seat 4 co-
operating with a valve disk S which ma~ be brou~ht
into en~agement wi~h the valve seat~ By means o a
supporting device 6 whicll is swingably mo~r1ted in
the valve housing l. the valve disk 5 may be swung
between closed position as indicated ~ ~nbroken
lincs in fi.g 1 and open position as ~ n~i~ated by
0 dash-and-dot lines in fig 1. This supporting device
6 includes a sh~ft 7 rota~ably s~ppor~e~ in the
valve housing l. said shaft extending within the
v~lve housing l, through the ~alls thereo~ and ter-
minateS outside the valve housing. A~ least une end
of said shaf t 7 is connected to hy~raulic, pneu-
matic, electrical or other power means, by means of
wh~ch ~ha~t 7 may be rota~ed between two angula~
positions. Shaft 7 is disposed siae~ays and above
the valve seat 4 and extends in parallel with a
pl~ne through the upper edge of the valve sea~ 4.
Inside the valve housing l the shaft 7 is rigidly
conne~ted with a hub 8 froln ~hich an arm 9 ex~ends
in the directlon towards the valve sea~. Supporeed
at the ~xee end of arm 9 is a pr~erably cy~1ndrical
2~ sleeve lO of annular c~oss section. said sleeve ex-
.tending coa~iall~ with the p~pe socket 2. ~ rod ll
of clrc~lar cross section is axi~lly displacable in
said sleeve lO and extends throuyh end walls 12, 13
of said sleeve. At the end portion of rod 11 extend-
ing ~owards the ~alve disk 5, rod ll is connected ~o~he v~lve disk 5 so that a rotati.onsl ~ovement of
rod ll about i~s own aY~is is transmitted to the
valve disk 5, thus l~parting to t~e valve disk a
corresponding rotational movement. As shown in fig l
35~ the connection be~ween ~od 11 and valve disk 5 is
znlss6s
obtained by means of a spherl~al, ball-like member
14 ~ormed at the end of rod 11, said spherical
membe~ being provided wi~h ~wo pins 15 extending
from the ~phex~cal member 14 in opposite dirèctlons.
The spherical ~nember or ball 14 including the pins
15 is joun~led in the hub SA o~ the valvQ di~k S 90
t~at valve dis~ 5 ~ill have a ce~tain freedom of
movement with respect to the rod 11, but so that
when ro~ 11 is being rotated about i~s own axls, a
coxxesponding rotational movem~nt is imp~rted to the
valve dis~. Inside sleeve 10 the rod 11 is provided
with a washer 16, rigidly connected to the rod. Dis-
posed between the washer 16 and ~he upper end wall
3 of sleeve 10 is a compression spring 17 ~hich
~ontinuously exerts a press~re force on ehe washer
~nd thus on rod 11 ln the direction towards the
.
valve seat. The sle~Ve 10 ~s provided W~th stopS 18
disposed on the inner surface of the sleeve above
the washer 16, sald stops limiting the movement o~
washer 16 ln the sleeve 10 between the bottom 12
thereof and said stop 1~. ~asher 16 ls f~rther pro-
vided with ~rooves, which cooperate wlth a cor-
responding number o~ rims 19 which are rigidly con~
hected with sleeve lO on the insid~ the~eof between
the bottom 12 of the sleeve and said stops 18. The
rims 19 extend under a ~ertain inclination with x~-
spe~t to the direction of the ~entral axis of rod 11
and sleev~ 10 respec~lvely. so that when rod 11 is
being di~placed in the axial dire~tion of the sleeve
10, a rotatlonal movement about its own axis is im-
parted to rod 11 by me~ns of washer 16. As mentioned
previsously the rotational ~ovement is transmieted
to the valve disk 4. Axial displacement of rod 11
thus imparts a rotational movement to the valve disk
~orresponding to the rotational movement of rod 11.
8968
When opening the valve, which is shown in its
c~osed position in fig 1. the arm 9 is made to swing
counter-clockwise by rotating sha~t 7 counter cloc~-
wi8e. During the ~irst sequence of said swln~ing
movement tS~e valve ~isk 5 will rema~n in con~act
w~th ~ e ~eat d under tlle inf~uenc~ o~ the force o~
the conpresslon sprin~ 17. due to the fact tha~
spring 17 expands~ Dùe to ~his ro~ 11 ls displa~ed
axially with respecC ~o the sleeve. a rotational
movement at the same time being imparted,to rod 11
vi~ rims 19 and ~lash~r 16. Thls rotational movement
is trans~ltted to the valve disk whi~h thus is ~aus~
ed ~o carry out a correspondin~ rotational movement.
~uring this rotational movem~nt the valve dis~ is
lS s~ill urged by p~essure ~orce towards the valve seac
undex the influence of the force exex~ed by the
spring. Due to this rotational movement, ~he valve
disk performs a periferal sllding movement along the
valve seat, thus exerting a grinding action on the
2~ ~alve ~eat, and due to this the valve seat is kept
free from impurities. The swinging movemen~ of arm 9
ls continu~d until ~he fully open position of the
valve has been reached, as indicated by dash-and-dot
lines in fig 1.
When closing the valve arm 9 is made to swing
in the opposite direction, 1 e clockwise. Under the
in~l~ence o~ the ~orce $rom sprlng 17 the washer 16
in the sleeve 10 is kept in ab~tment against the
bottom wall 12 of the sleeve 10. When the valve dlsk
5 during continued swinging movement ha~ ben swung
in~o engagement with valve seat ~. continued swing-
ing move~ent of arm 9 resul~s in th~t xod 11 is dis-
placed with respect to the sleeve 10, at the same
time comPressing sprlng 17. Via rims 1~ a~ld washer
16 ~ rotational mov~ment ls imparted to ~he rod 11
9~8
and thus also to the valve disk 5. During this rota-
tional movemenl ~he valve dls~ 5 is in engagement
with the valve xeat 4, thus exerting a grind~ng a~-
tion on the seat.
6 The lnvention 1~ not limited to the embodlment
described above with referen~e to the figures, but
may be sub~ect to modifications wi~hin the scope of
the ~ppended claims.
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