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Oct.'25,1938.
v
HLENTZ ET AL
'
2,134,466
‘COMPOUND STEAM ENGINE '
Filed Jan. 29, 1937
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7 Sheets-Sheet 1
Oct. 25, 1938;
H. LENTZ ET AL
. 2,134,466
COMPOUND STEAM ENGINE
Filed Jan. 29, 1937
7 Sheets-Sheet 2
Oct. 25, 1938. ‘
H. LENTZ ET AL
'
2,134,466
COMPOUND STEAM ENGINE
med Jan‘. 29, 1937
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COMPOUND STEAM ENGINE
Filed'Janl 29, 1957
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Oct. 25; 1938.
I H, LEQTZ ET AL‘
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COMPOUND STEAM ENGINE
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Filed Jan. ‘29, 1937
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H LENTZ ET'AL
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2,134,466
COMPOUND STEAM ENGINE
Filed Jan. 29, 1937
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‘7 Sheets-Sheet s '
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oct'; 25, 1938.
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‘
H‘ LENTZ ET A].
v
COMPOUND
STEAM
' 2,134,466
ENGINE
‘ Filed Jan. 29, 1957
7 Sheets-‘Sheet 7
5a
‘192
‘' Patented oer. 25, 1938]
22,134,466 >
UNITED STATES PATENT. OFFICE [
.
comomm STEAM ENGINE '
Hugo llentz, Berlin, Germany, and Hugo Johannes
. Lents, Vienna, _Austrla
.IApplication January 29,1931, Serial No. 122,994
'
.
>
In Germany January 29, 1936
'1 Claims. * (01. 121-102)
Compound steam engines of the Woolf type valves for the high pressure to open separately
’
when starting so that the live steam is immediate
1y fed to the low pressure cylinder and there‘ de
velops a high pulling moment until the normal
with poppet valve gear are known, in which these
valves are arranged side by side at each end of
the cylinder block and in which each of the
5 valves is controlled by a separate cam. However,
the object of this arrangement, namely to keep
vthe steam passages short and the clearance small,
running can begin.
'
_
,
of Fig. 2 through the high pressure cylinder, the 10
low‘ pressure cylinder and the valve chest inter
trol valves with spindles located the one'within
posed between these two cylinders of- a com
pound steam engine of the Woolf type with con
trol drive actuated in the middle.
Fig. 2 is an end view of the cylinder block on 15
the other at each end ‘of the cylinder, to thus ar
rangethem coaxially one behind the other and
control them by a common cam.
‘
Fig. 1 is a longitudinal section on line 1-1
10 cylinder steam engines, to~ construct the two con
1.5
,
lustrated by way of example in the accompany
ing drawings, in which:----
.is not entirely‘attained.
It is likewise. known, in connection with single
'
(
Several embodiments of the invention are il
‘
The invention goes still farther, in that in com
pound steam engines of the Woolf type a com
larger scale.
*
t Fig. 3 shows on larger scale and in longitudinal
bined cam controls the setsgo‘hvalves arranged
at each end of the cylinder block between high
section the valve chest situated at one end of the
cylinder block with built-in valve set.
pressure and low pressure cylinders, each set com
20 'prising three coaxial valves arranged one behind
Fig. 4 shows the intermediate levers in side ele- 29, '
the other with their spindles mounted one within
the other. By this arrangement an extrelnely
compact construction of the valves and conse
vation.
_
Fig. 5 is a longitudinal section through the
valve chest and valve set of a compound engine
quently a considerable reduction in the clearing of the Woolf type, in which a cam shaft is pro
25 is obtained but at the same time the whole gear vided at each end of the cylinder block for con- 25
trolling the valve set.
drive is considerably simpli?ed.
.
_
Fig. 6 is an elevation on a larger scale showing .
The combined cam serving for controlling the
a combined cam acting on the valve spindles.
Fig. 'I is a section on line VII-VII of Fig. 6.
Fig. 8 is a diagram showing the curves of the 30
valve lifts in dependency upon the crank angle.
sets of valves can have all three control surfaces
for the admission, bypass and exhaust, in which
.30 instance it is driven by a cam shaft. It is then
' possible to use the control. surfaces for the ex
haust also for-controlling the admission; if the '
Figs. 9 to 12 ‘show a“ cam drive, in which the Y
admission cam is arranged adjustable relatively
valve so that it opens later than the/exhaust “ to the exhaust cam and separately driven.
, Fig. 13 shows a section through the valve chest 35
35 valve. The combined cam can,'however, be also
constructed as a two-part cam, one part having‘ of another form of construction of gear employ
,
'
the‘control surfaces for the admission and the ing single seat'valves.
Fig,(14 is a similar section with open by-pass
second part the control surfaces for bypass and
admission valve is constructed as piston slide
.exhaust, each part being driven by a‘ separate
40
shaft.
.
‘
_
d.
-
The combined cam for controlling both sets of
valves can be arranged in the middle ‘of the
' cylinder, in which case the valve spindles mount
ed one ‘within the other are directed the one
45 against the other. The valve spindles may, how
ever, also be outwardly directed, in which case
a combined cam is arranged on each end of the
valve chest. This arrangement presents the ad
vantage that in the case of repairs being neces
50 sary each set of valves can be removed as a whole
and replaced by a new set.
’
For closing the valves an elastic pressure me
dium .(for example steam) acting on the valve
spindles is employed, which medium, however,
55 enables in the new arrangement the admission
valve.
.
-
Fig. 15' is a section showing a control valve for 40
>
the closing steam in the position corresponding
to coasting of the engine.
-
-,
,
_
Figs. 16 and 17 are diagrams showing, respec
tively, the position of the control valve for start
ing the engine and for closing all valves.
The form of construction illustrated in Figs. 1
to 4 will ?rst be described.
I
-
is a cylinder block of a compound engine
with a high pressure cylinder 2 and a' low pres
sure cylinder 3. At each end of the cylinder block 59
a valve chest 4 is cast between the two cylinders,
the feed and exhaust passages for the steam lead
ing into this chest. In each valve chest an admis
sion valve 5,‘ a by-pass valve 6 and an.exhaust
valve 1-, are arranged ‘coaxially one behind the
2
2, 184,466
other and effect the steam distribution for one, with a certain overlapping, so that it opens later
piston side of the two cylinders. For this purpose than the exhaust valve 1. This presents the ad
a cup-like member 8 is inserted in the endwali vantage that the acceleration of the admission
8 of the valve chest and carries the lower seat valve takes place already before it opens, so that
of the exhaust valve 1. The upper seat of the the admission passage is exposed very quickly and
exhaust valve is arranged on’ ‘an inwardly pro
the steam can flow into the high pressure cylin
- jecting edge to of the valve chest 4. Radial slots
der without being throttled.
9' in the tapered part of the cup member 0 guide
To maintain the gear elements permanently
the ribs ‘I’ of the exhaust valve 1 and preventthis in contact and to return the valves on to their
10 .valve from turning. The exhaust valve ‘I shuts seats, an elastic pressure medium such as steam
off a space H from the side of which an exhaust
passage I2 extends.
.
The seats for the by-pass valve I are arranged
on a valve cage l3 inserted in the valve chest 4.
15 This cage can bear against the cup member 9
and has an annular extension I4 which engages
in a central bore in the, member 9. The inner
part of the valve cage i3 is of smaller diameter
than the outer part so that an annular space It
20 remains between the by-pass valve i and the
exhaust valve 1, said space being connected with
a by-pass passage l6 leading to the low-pressure
cylinder 3.
acting on the valve spindles is employed instead
_ of springs.
‘
'
In the valve cage It a second valve cage i1
25 is arranged for the admission valve I constructed
as a piston slide valve. The valve cage I‘! has
passages i8 which lead into an annular space
I! situated above the by-pass valve I. A pas
sage 20 leads from the annular space I! to one
30 end of the high-pressure cylinder 2.
.
A space 22 situated above the admission valve
5 and closed by a cover II is connected with the
For this purpose the following ar
rangement is provided:
Firstly, a bore 12 is provided in the cover ii,‘
to which wet steam or some other pressure me
dium is supplied‘ through a conduit 3i.
This
medium acts on a pressure piston 33 mounted in
the bore 32, which piston is pressed against the
spindle to of the admission valve into its closed
position. With a view to maintain also the other
valves 5 and 6 in closed position by steam pres
sure, the bottom of the Tvalve cage II is con
structed as a hollow body 34, the internal space
35 of which is connected by a bore 38 in one of the
reinforcement ribs with a steam conduit 8|; The 25
space 35 communicates by means of a bore 81
in the hollow spin e is with an annular space
85a produced by re using the spindle la of the
admission valve from its normal diameter iii
to a smaller diameter dz. The admission valve 80
spindle 5a is pressed towards the right by the
closing pressure acting on it. It can therefore
live steam'conduit by a laterally arranged tubu
lar connection 23 indicated in dotted lines in
be regarded as a rigid counter bearing-so that
..
35 Fig. 2.
' As already mentioned, the spindles of the valves
are mounted one within the other. For this pur
towards the right with a pressure which acts in
pose the spindle ‘Ia of the exhaust valve ‘I is-a
hollow spindle, which is mounted at one end in a
40 central bore 9" of the valve cage 9 and at its
other end in a central bore II’ in an inserted
member It. The hollow spindle ‘Ia accommo
dates the hollow spindle 8a of the by-pass valve
6 and in this hollow spindle 6a the spindle Ia
45 of the admission valve 5 is mounted, The ends
of the spindles project into the cam shaft cham
the pressure prevailing in the chamber Ila
presses the spindle 6a of the by-pass valve 4
the annular chamber formed between the diam
eters iii-dz. The steam pressure prevailing in
the. space 35 may also act on the end of spindle
‘la of the exhaust valve. Thus, all the valves 40
are maintained under‘ closing pressure during
the service.
The steam conduits 30 and 3| leading respec
tively to the chambers 32 and 35 are ‘at the same
time connected with a control valve 41 in a cas
ing 46, the valve being adjustable from the
ber 25 in which the cam shaft 24 and the other ' driver's stand through a suitable rod, not shown,
and a lever e and serving at the same time as
arranged. The cam shaft 24 is oscillated in the _ starting and coasting pressure compensation de
elements serving for controlling the valves are
50 usual manner by/a rod system.
The gear drive comprises a combined cam
keyed on the cam shaft 24 and carrying the
cams for actuating all the valves.
-
The admission valve 5 of the high-pressure
cylinder and the exhaust valve ‘I of the low
vice The valve 41 has a passage I and controls
four passages in the casing 46. Passage a is con 50
nected to the boiler of the engine, or to a com
pressed-air reservoir, by a pipe 53; the passages
b and c are connected, respectively, to the con‘
duits III and'tl; and a vent passage d is con
nected to a discharge pipe d’ opening into the 55
pressure cylinder are actuated by the same cam
21. When this cam swings, it presses against an atmosphere. In the coasting position, Fig. 15,
intermediate lever 28 oscillatable about an axis; the supply of medium under pressure through
28' and'having a forked end. A middle finger conduit 83 and passage a is closed by the valve
60 28a comes into contact with the end of the ad
41, and the pipes 30 and 3| are connected to at
mission valve spindle 5a, whereas two ‘outer fin
, gers 28b come into contactwith the end of the
hollow spindle ‘la.
-
On the other hand the by-pass valve 6 is ac
(i5 tuated by a cam 28 which acts on an interme;
diate lever 29 oscillatable about an axle 29’.
x The free end of the intermediate lever 29 is
also forked.- Its ?ngers 29a engage between the
fingers of the intermediate lever 28 and’act on
70 the end of the spindle 6a of the by-pass valve
As in this construction of the cam the lifting
surfaces 2'! lift the admission-and exhaust valves
simultaneously, but the two valves must open'at
di?'erent times, the high-pressure admission
.76 ,valve 4 must be constructed as piston slide valve
mosphere. The valves brought into their open
position by the cams then remain in this posi
tion, so that free communication is established
between the two ends of the cylinder.
When“ starting a compound ‘locomotive, it is 65
found necessary to ?rst supply steam only to the
large surface of the low pressure piston, so as to
obtain a stronger pulling moment, whereas the
. high pressure cylinder is only connected up later.
This can be effected in a simple manner with the 70
gear according to the invention by placing, when
starting the control valve 41 into the position
shown in Fig. 16. In this position, steam from
passage (1 flows to the conduit 30 and the hollow
space "a. The vent passage d is closed. The 75
2,134,443!)
3
pressure prevailing in the annular ‘chamber Ila same manner as in the form of construction first
If the regulator is then slowly opened, the live
described, and ‘they are controlled in the same
mannerby a cam shaft 24 which is, however,
here journalled in a hollow cover 45 covering the
bore of the valve chest 4 and at the same time
securing the different inserted- members in the
valve chest.
'steam passes from the chamber 22 through the
opened admission valve .5 and the by-pass valve
This construction of gear presents the advan
tage that in the event of repairs, the whole valve
acts on the spindle in and brings the admission’
valve 5, as there is no counter-pressure, ?rst into
its open position. It then places the spindles 6a and 1a under pressure, so that the by-pass valve
6 and the exhaust valve 1 can, operate normally.
set can be taken out, after the removal of the 10
cover 45, and a fresh valve set inserted. The
dismantling and fitting of the gear can there
.fore be carried out in a very short time.
The operation of the gear is the same in both
forms of construction. If for example, the cam 16
'21 moves out of its middle position towards the
left, the exhaust valve 1 will ?rst be opened and
allows the exhaust steam to pass out of the low
10 controlled by the cam, directly into the low-pres-_
.sure cylinder 3 which, owing to the larger piston
‘surface, can produce the power necessary for
K starting.
When it’ is desired .to change over to
normal service, the control valve 41 is placed
15. into the position illustrated in Fig. 17 in which
passages b and c, and pipes 20 and SI, are con;
nected to the supply passage 41, and the venture
sage d is closed. All valves are now'under closing
pressure.
v
.
_
'
pressure cylinder 8 through the passage i6 into
the exhaust space H, from which it escapes
through the tubular connection l2. Shortly
thereafter the same cam “opens the admission
f
. Undercertain circumstances, if the pressure
surfaces are correspondingly proportioned,‘ the
pressure piston 33 can be entirely omitted in that,
20]
by gradually opening the regulator the increas-s valve 5, so ‘that live steam can pass from the
space 22 through the inflow passage 20 to the
‘high-pressure ‘cylinder 2 in which it expands
after the closing of the admission valve 5. During
this time the by-pJass valve remains closed. Be
fore the change of stroke and when the admis
controlling position and the engine then operates sion- and exhaust valves are closed, the by-pass
ing steam pressure acts on the spindle 5a of the.
admission valve until it is able to overcome the
counterpressure in the annular chamber 25a act
ing on the same spindle. when this occurs the
admission valve is‘ automatically brought into the
30
in its normal manner.
.
opens. so that partly expanded steam can pass
- ‘
from the high-pressure cylinder 2 through the
The form of gear shown. in Fig. 5 di?ers sub
passages to and it into-the low-pressure cylin
der. in which, after the closure of the vby-pass
valve, the steam expands to its ?nal pressure.
At the other end ‘oi’ the cylinder the same series
stantially from that above described only in that
the valve sets arranged on both ends of the cyl
inder block I are insertable as anaggregate into
the bores of the valve chest 4 and the valves are
controlled each by a shaft arranged at each end
of the cylinders.‘ In this ‘instance each valve set
of operations take place only displaced through
a phase of'i80".
'
If the admissionvalve is not constructed as a
- comprises an insert member 38 adapted tobe'
piston‘ slide‘valve' ‘but, like the other valves, as '
slipped into the bore in/the valve chest,‘ in the
an ordinary double seated poppet valve, sepa
rate lifting surfaces are necessary for controlling
the admission and inlet valves. In Figs. 6 and 7
- the exhaust valve 1. vThe other seat of the ex
haust valve is arranged on an annular extension such‘a gear drive is shown in section and eleva
tion. The ?nger-shaped end of an intermediate
38" of the insert member 38.
lever 50, mounted on the axle 2t and actuated
'45 A valve cage 40 for the by-pass valve t is ?tted by
a cam ‘ti, bears against the end‘ of‘the ad
in the casing '38 from the rear side thereof and
bears at one end against the‘ inner edge of the mission valve spindle ta. To enable this inter
insert ‘member 38 and at its other end against mediate lever W to swing out, the end of the
spindle ta of the by-pass valve t has an aperture
the edge of the cup 39, this cage having an an
6b, through which the‘ end of the intermediate 50
nularextension
40,’
which
engages
in
the
cup
39.
50
The valve cage 40, which carries the seats for lever til can’ pass. The forked end of an inter
mediate lever 60 mounted on the axle‘ 29' and’
the by-pass valve _6 has passages 4! which estab
end wall of which provided with a hub W’ a cup
$9 is inserted, which carries the lower seat for
actuated by a cam ti bears against the end of
lish communication between the space I! above‘
the spindle to of the by-pass valve 6. The spindle
‘lq. of the exhaust valve ‘I, however, is controlled“ 55
the by-pass valve 6 and'the annular space vi5;
between the by-pass valve 8 and the exhaust
valve 1. A by-pass passage l6 ‘branches from the
by two intermediate levers ‘Ill mounted on the
axle ‘2B’ and by two similarly shaped exhaust
space l5 and leads to the end-70f the low pres
sure cylinder 3.
I
I
'
»
,
'
A second valve cage 43 for the piston slide
60. valve 5 is ?tted in the valve cage 40. This valve
cage 43 bears at its inner end against the bottom
of the valve cage 40 constructed as a'hollow body
_ '° 35 and at its outer side has an edge 43'. bearing
' against the edge of the valve cage 40.‘ The ad
mission valve 5 opens directly into the live, steam
space 22, to which live steam is supplied through
the tubular connection 23. The admission valve
5\ controls the-passages 44 provided in the valve
cage 43 which, whenthe valve is open, establishes
70 connection between the live steam space 22 and
the’ space l8, from which the by-pass passage
cams ‘ii.
The two intermediate levers ‘l0 bear
against the end‘of the spindle ‘la above the mid
dle plane of the spindle. The lower half of the 00,
spindle has an aperture ‘lb vwhich allows the
intermediate lever 60 to move without hindrance.
The cams 5i, ti and ‘II are in this instance
cut from a block keyed on the cam shaft 245.
Where necessary, apertures areprovided in this cs
block to enable the unimpeded adjustment of
the intermediate levers. The control surface of
the admission cam 5i lags slightly behind the
control surface of the exhaust cam ‘H, so that
*the exhaust valve opens earlier than the admis 70
sion valve as shown diagrammatically in Fig. 8 .
20 leading tothe end of the high pressure cylin
wherein the periodicity and extent of the valve
der branches. The spindles 5a, to, ‘la of the three _
valves are mounted one within the other and are
lifts are indicated.
'
J
The 'block with the cams is also constructed
"(is held in closed position by steam pressure in the ‘ symmetrically to the vertical medial plane so 75
H
4
9,184,486
one behind the other, valve spindles one carry
which only one shaft is arranged in the middle ing each‘ of said valves and mounted one within
of the cylinder and two shafts are provided at - the other, and a combined cam adapted to con
I that the block can be employed for gears in
the cylinder ends.
In the gear above described the admission cam
5| is stationary relatively to the exhaust cam
‘H. In Figs. 9 to 12 a gear drive is shown which
trol said sets of valves.
2. A compound steam engine as speci?ed in
claim 1, in which the combined cam is com
differs from that previously described only in
having a control surface for the admission, and
the other the control surfaces for the by-pass
and exhaust valves, and‘ the two parts are each 10
that the admission cam 5| is adjustable rela
10 tively to the exhaust cam 6| for the purpose
of varying the charge. For this purpose the
shaft 24 is constructed as a hollow shaft, the
cam block removed from between the exhaust
cams ‘H, and in this recess thus formed the
15 admission cam is turnably arranged, this admis
sion cam being driven by a second shaft 24a
mounted in the hollow shaft 24 and extending
through a central bore therein and coupled there
with by projections engaging in longitudinal
20 grooves in the shaft 24a.
Each of these shafts is separately driven. Con
sequently the admission cam can be displaced
from the outside relatively to the exhaust cam,
so that it opens sooner or later, which enables
the steam distribution to be regulated within
wide limits.
The kinds of gear above described employ
double seated valves. The-same gear drive can
also be employed for- single seated valves which
30 are easier to produce and by which primarily
the clearance can be kept very small. They are
suitable for more slowly running marine steam
engines. Figs. 13 and 14 show such a gear,
wherein the valves are driven by a control drive
35 according to Figs. 6 and 7. Therefore, the cor
responding gear elements are designated by the
same references. Consequently, it is not neces
sary to particularly describe this gear drive.
Differing from the types of valve gear already
described,'the valves are constructed as cone
posed of two relatively adjustable parts, one part
driven by a cam shaft.
3. A compound steam engine as specified in
claim 1, in which the combined cam is driven
by a cam shaft and a control surface adapted
tocontrol both the exhaust valve and the ad 15
mission valve for the high-pressure cylinder and
said admission valve is constructed as piston slide
valve adapted to open later than said exhaust
valve.
'
4. In a compound steam engine as specified in 20
claim 1, in each valve set a valve cage carrying
the by-pass valve, a valve cage carrying the ad
mission valve and mounted in said by-pass valve
cage, a bottom on said by-pass valve'cage con
structed as a hollow body, and means for sup
25
plying steam to said hollow body to exert clos
ing pressure on the spindles of said by-pass and
exhaust valves.
5. In a compound steam engine as specified in
claim 1, in each valve set a valve cage carrying 80
the by-pass valve, a valve cage carrying the»
admission valve and mounted in said by-pass
valve cage, a bottom on said by-pass valve cage
constructed as a hollow body, and means for
supplying steam to said hollow body to exert 85
closing pressure on the spindles of said by-pass
and admission valves, the spindle of the admis
sion valve mounted in the tubular spindle of the
by-pass valve being reduced to a smaller diam
eter and forming with the tubular spindle of the 40
shaped single-seat valves 52, 62 and 12.; The _ by-pass valve a chamber communicating with the
by-pass valve 62 and the low-pressure exhaust space in said hollow body through a bore in the
valve 12 are provided with ?anges “and 13, tubular spindle.
respectively, mounted to slide in bores 64 and
45 14, respectively, of the valve casings I3 and 4,
respectively. The stroke of the valves is equal
- to the width of the corresponding by-pass pas
sages l6 and 20. Fig. 14 shows the full-open
position of the by-pass valve 52 in which the
50 ?ange 63 of the valve enters the bore 64 and
the steam ?ows through the by-pass passage is
from the high-pressure cylinder to the low-pres
sure cylinder without being throttled. The low
pressure exhaust valve 12 in its full-open posi
55 tion enters the bore 14 with its ?ange 13 so
that the exhaust steam ?ows in the passage 20
without being throttled.
0f the nested valve spindles 5a, 8a and la the
latter is guided on an insert member 48. They
spindles 6a and 1a are secured against turning.
by a key 49 which engages in longitudinal grooves
in these spindles.
To maintain the valves in closed position it
is su?icient in this instance to connect the in
ternal space 55 of the gear housing with an
evacuated space (for example to a condenser)
by means of a conduit 58.‘
We claim:--
'
1. A compound steam engine of the Woolf type
70 with valve gear, comprising in combination a
cylinder block having a high. pressure cylinder
and a low pressure cylinder, sets of valves ar
ranged at each end of ‘said block, each set com
prising an admission valve, a by-pass valve and
an exhaust valve said valves arranged coaxially
I 6. In a compound steam engine as speci?ed in
claim 1, in each valve set a valve cage carrying 45
the by-pass valve, a valve cage carrying the ad
mission valve and mounted in said by-pass valve
cage, a bottom on said by-pass valve cage con
structed as a hollow body, and means for sup
plying steam to said hollow body to exert clos 50
ing pressure on the spindles of said by-pass and
admission valves, thespindle of the admission
valve mounted in the tubular spindle of the by
pass valve belng reduced to a smaller diameter
and forming with the tubular spindle of the by 55
pass valve a chamber communicating with the
space in said hollow body through a bore in the
tubular spindle, a pressure piston subjected to the
in?uence of a pressure medium and adapted to
act on said admission valve spindle, and a cover
‘plate having a bore coaxial with said spindles and
accommodating said piston.
-
7. A compound steam engine of the Woolf type
with valve gear, comprising in combination a
cylinder block having a high pressure cylinder
and a low pressure cylinder, sets of valves ar
ranged at each end of said block, each set com
prising an admission valve, a by-pass valve and
and exhaust valve, said valves arranged co-axially
one behind the other, valve spindles one carrying 70
each of said valves and mounted one within the
other, a combined cam adapted to control said
sets of valves, a hollow seat for the by-pass valve.
9. cover plate having a bore, a piston on the outer
end of the admission-valve spindle mounted to II
slide in the bore, a. reduced portion on the ad
to the cylinder, and to the interior of the hollow
; mission-valve spindle de?ning an annular cham- \ seat, a. vent on the casing, and a. manually oper
ber between this spindle‘ and the tubular spindle
of ‘the by-pass valve which chamber communi
ated control valve in the casing for controlling
the conduits and the vent.
v
,
\ cates with the interior of the hollow seat through
the tubular spindle, a/ casing; conduits connect
in; the casing to a suppiyoi' ?uid under pressure,
HUGO LENTZ.
HUGO JOHANNES LENTZ.
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