Year: 1894

page_text: Date of Application, 9th Oct., 1894-Accepted, 2nd Feb., 1895

page_text: pressure of steam. e represents recesses in the upper valve seat. e represents
independent steam passages connecting recesses e with the lower valve ports so as
to obtain the same pressure on both faces of the valve at all times. The delivery
port E' in the seat of the auxiliary valve is centrally over the main valve when it
is at the cut-off position shown in Fig. 2, and supplies steam alternately to each set
of ports of the main valve so that the single cut-off valve is employed with a duplex
main valve and both are balanced under pressure: Surrounding the main valve is
an exhaust chamber I which communicates with the exit passage I cored in the
cylinder. The engine here shown is illustrated as adapted to be used as a
locomotive engine and the steam is received into the live steam chamber through
the passages J pierced through the walls.of the steain chest.
As will be seen the auxiliary valve is in the live steam chest and the main valve
is surrounded by the exhaust steam the live steam being supplied through one ond
of the main valve in one part of the stroke and the steam being compounded upon
the larger piston is passed through the opposite end say ports 4, 5, as shown in
Fig. 1, and the exhaust steam is being exhausted say from port 3, into chamber I
outside of the valve.
It is sometimes desirable especially in the case of locomotives and marine engines
to convert the compound into a direct acting engine so as to utilise the live steam
on the entire or larger piston areas. For this purpose there is employed what may
be termed "converting" valves. L, L, represent poppet valves which are preferred
for this purpose. These valves seat in the auxiliary stean.chest M. m represents
ports pierced through the shell of the cylinder upon each side of the division
ring K which separates the cylinder into two compartments and within which ring
the shell piston journals. When valves L, L, are raised up in the position shown
in Fig. 1, the steam flows in the direction of the arrows through said poppets valvo
chest say through ports m thence around the cylinder of the piston through
port 4, thence through port 5 on to the end of piston P, so that pistons P, PI,
are each subjected to the action of live stean.
N represents a cam lever for
operating said poppet valves. It is shown as adapted to be attached to and
operated by the cut-off lever of a locomotive and for this purpose the pin p
engages with the cam groove n the said pin p being inserted in the yoke R to
which is attached the stems of the poppet valves so that both valves are raised
and lowered simultaneously by the incline n' of the cam groove n near the end of
the stroke of the caun lever N. Thus if the cut-off valve of a locomotive be thrown
to the extreme forward position the poppet valves L, L, will be raised as they are
shown in Fig. 1, when the pin would occupy the position r. But as soon as the
cam lever N has moved a little way the valves are closed and the live steam is cut-
off from entering through the ports m, m, and the engine is converted back to the
compound. In order that the cam lever N may convert the engine from a simple
to a compound when the engine is reversed as well as when it is running forward
the cain groove has an incline n' at each end.
go
The cut-off lever of the locomotive standing normally in the central position
to the segment when it is moved forward toward the extreme position the poppet
valves would be raised or lowered when the lever is pulled back. As shown in
Fig. 1, the cam lever N is pulled backward and the pin poccupies the position in
the forward end of the groove which is indicated by in the rear end of the groove.
An important advantage is obtained by this as a single lever will operate the
poppet valves as well as the cut-off valves, the former being operated at the extreme
end of the movement and only when more power is required. In Figs. 8, 9, 10, 11,
is shown the improved valves and steam chest applied to a simple engine in
which A represents the main skeleton valve which alternately covers and uncovers
the ports 7, 8, for driving piston 9, in alteruate directions. The auxiliary valve C
is constructed and operated the same as that shown in Figs. 1, 2, both valves are
operated under the pressure of steam and operated in the divided steam chest in
the same manner as before described. 11, represents the exhaust pipe from the
exhaust chamber I. Hrepresents the supply opening to the live steam chest D.
:

page_text: Important results are accomplished by locating the main valve in the'exhaust.
chamber and providing through passages for the live steam in the main valve and*
exhausting over the ends of the cut-off sections directly into the exhaust chamber.
The exhaust takes place alternately over the opposite ends of the main valve. In
Figs. 1, 2, the main skeleton valve is of duplex form for controlling the steam in
the two cylinders, while in Figs. 8, 9, it is of single form for controlling the steam
in the one cylinder.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1st. The skeleton main valve provided with a through steam passage between
the cut-off sections, substantially as specified.
2nd. The skeleton main valve provided with a through steam passage upon each
side of the central cut-off sections, substantially as specified..
3rd. In combination with an exhaust chest located between the live steam chest
and cylinder the skeleton main valve with a through passage admitting live steam
to the cylinder ports and exhausting from the same ports outside the ends of the
valve, substantially as specified.
4th. In combination with an auxiliary valve. located in a live steam chest the
skeleton main valve A provided with a through passage between the cut-off section,
substantially as specified.
5th. In combination with an auxiliary valve located in a live steam chest the
skeleton main valve provided with a through passage each side of the central cut-off
section located in the exhaust chamber, substantially as specified.
6th. The combination of the live steam chamber and an auxiliary valve with the
exhaust chamber and a main valve with ports and passages leading from the
auxiliary valve and its seat through the openings of the duplex main valve located
in the exhaust chest, substantially as specified.
7th. In combination with the piston P, P', the valves L, L, with passages
connecting through the valve chamber each side of the partition K, and mechanism
for operating said valves to convert the engine from a simple to a compound and
vice versa, substantially as specified.
8th. In combination with the valves L, L, the ports and passages connecting said
valve chambers with the divided cylinder, the cam lever N provided with a slot n
and incline n' at either end whereby the valves are operated each near the end of
the stroke of said lever, substantially as specified.
9th. The balanced sbell auxiliary valve C located in the live steam chest D,
provided with entrance ports, a series of cut-offs on the bottom face of said valve,
a discharge port E, in combination with the valve seat having a series of ports
coincident with the cut-offs of said valve, substantially as specified.
Dated this 9th day of October 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.