Year: 1887

page_text: Date of Application, 29th Mar., 1887
Complete Left, 29th Dec., 1887
Complete Accepted, 3rd Feb., , 1888
•
I, THOMAS WILLIAM WORSDELL, of Gateshead, Durham, Civil and Mechanical
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to compound engines provided with an auxiliary or
starting valve and an intercepting valve to render the engine efficient in starting
without opening the high pressure cylinder to the atmosphere when the crank on the
high pressure side is on a bad starting point such as a dead centre.
The auxiliary or starting valve is to admit steam directly from the boiler to the
low pressure or larger cylinder, and the intercepting valve is applied in the exhaust
pipe or passage or receiver that connects the two cylinders.
Now according to my present invention a plug cock is employed as the auxiliary
or starting valve and the plug is formed or provided with an extension that carries
the intercepting valve, the arrangement being such that when the cock is opened (it
may be by hand) the intercepting valve will be closed, and when steam exhausts
from the high pressure cylinder into the passage connecting the two cylinders the
pressure of the exhaust steam will automatically open the intercepting valve and
close the starting cock.
.nu : ܐܝܝܝ
CL 1007
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.
Agent for the Applicant."

page_text: Improvements in Compound Engines.
I, THOMAS WILLIAM WORSDELL, of Gateshead, Durham, Civil and Mechanical
Engineer, do hereby declare the nature of this invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement :-
This invention has reference to compound engines provided with an auxiliary or
starting valve and an intercepting valve to render the engine efficient in starting
without opening the high pressure cylinder to the atmosphere when the crank on the
high pressure side is on a bad starting point, such as a dead centre.
The auxiliary or starting valve is to admit steam directly from the boiler to the
low pressure or larger cylinder, and the intercepting valve is applied in the exhaust
pipe or passage or receiver that connects the two cylinders.
Now according to my present invention a plug cock or disc valve is employed as
the auxiliary or starting valve and the plug is formed or provided with an extension
that carries the intercepting valve, the arrangement being such that when the cock
or dise valve is opened (it may be by hand) the intercepting valve will be closed
and when steam exhausts from the high pressure cylinder into the passage connecting
the two cylinders the pressure of the exhaust steam will automatically open the
intercepting valve and close the starting valve.
In the accompanying five sheets of drawings
Fig. 1 shows partly in elevation and partly in section a casting provided with
starting and intercepting valves connected and arranged according to this invention
the said valves being shown in dotted lines.
Fig. 2 is a vertical section taken in a plane at right angles to Fig. 1.
Figs. 3 and 4 are similar views to Figs. 1 and 2 illustrating a modification.
Figs. 5 and 6 are detached views drawn to a larger scale of the starting valve
shown in Figs. 3 and 4.
In Figs. 1 and 2, 1 is the starting valve in the form of a plug cock formed with a
passage 2 therethrough. It is fitted to work in a chamber 3 formed at one side of
the casting 4 which when in use forms part of the exhaust pipe or passage or receiver
that connects the high and low pressure cylinders. The valve chamber 3 is in
communication by a passage 5 with an inlet pipe 6 for admitting high pressure steam
from a boiler, and by a passage 7 with the interior of the casting 4 as shown. The
plug cock 1 is formed with a squared spindle 8 upon which is fitted an intercepting
valve 9 (Figure 1), and with a stem 10 that extends through a stuffing box 11 and
gland 12.
13 is a lever or handle fitted to the outer.end of the valve stem 10 whereby
the starting or plug valve may be opened when desired.
As will be seen the relative positions of the starting and intercepting valves are
such that when the starting valve is turned to its open position as shown in Fig. 1
the in rcepting valve vill be closed against its seat 14. High pressure steam will

page_text: then pass from the passage 5, through the starting valve and the passage 7 to the
interior of the casting and thence, by way of the exhaust pipe or passage, to the
steam chest of the low pressure cylinder. The intercepting valve 9 will be forced
upon its seat 14 by this steam which will thus be prevented from passing to the
steam chest of the high pressure cylinder. When exhaust of the high pressure
cylinder takes place the exhaust steam acting upon the other side of the intercepting
valve will automatically open this valve and close the starting valve.
In Figs. 3, 4, 5 and 6 the starting valve 1 is a slide valve in the form of a segment
of a disc secured to the spindle 8 which carries the intercepting valve 9. It is
located within a steam chest or valve chamber 3 closed by a cover 15 and is arranged
to work upon a valve face in which is a port in communication with the opening or
passage 7.
This passage communicates with the interior of the casting 4 as before.
16 is a spring located between the starting valve and the inner part of the cover 1;
serves to keep the said valve up to its seat. 5 is the passage for admitting high
pressure steam from the inlet 6, to the steam chest or valve chainber 3. The
positions of the starting valve 1 and connected intercepting valve 9 when the valve
spindle is so turned that the valve 1 uncovers the passage 7, are shewn by chain
lines in fig. 3, whilst the positions of these valves after the intercepting valve has
been opened by the action thereon of exhaust steam from the high pressure cylinder
is shown by dotted lines.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I desire it to be understood
that I do not claim broadly as of my present invention the use of both a starting valve
and an intercepting valve, an arrangement comprising such is described and claimed
in the specification of a former patent granted to me the 23rd day of January A.D. 1885
No. 999 but I declare that what I claim is :-
In a compound engine the application and use as set forth of two valves such as
described namely a starting valve of rotary kind and an intercepting valve, these
being connected together in such a manner that when one of them is caused to
partly rotate or turn, the other will turn with it as hereinabove explained with
reference respectively to Figs. 1 and 2 and to Figs. 3 to 6 inclusive of the drawings
annexed for the purposes mentioned.
Dated this 27th day of December 1887