Improvements in Slide-valves for Steam and other Fluid-pressure' Engines.
Year: 1890

page_text: Date of Application, 4th Mar., 1890-Accepted, 5th Apr., 1850
COMPLETE
SPECIFICATION.
Improvements in Slide-valves for Steam and other Fluid-pressure'
Engines.
.I, PETER BROTHERHOOD, of Belvedere Rond, Lambeth, in the County of Surrey,
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 :-.
My invention has for its object to simplify the construction and action of slide
valves for steam and other fluid pressure engines, to obtain compactness in their
arrangement, and at the same time to secure large area of passage for the working'
fluid consistently with very small clearance space in the passages to the cylinder.
For this purpose, I subdivide the slide valve into a number of separate valves,
each in the form of a piston valve governing a circular hole close to the cylinder port,
and I connect the stems of these separate piston valves to one operating rod which
is worked by eccentric or other ordinary gear.
The accompanying drawings shew my invention applied to steam engine cylinders'
under various conditions. +
Figure 1 is a vertical section and Fig. 2 is a sectional plan shewing valves according
to my invention applied to a single cylinder.
Fig. 3 is a vertical section and Fig. 4 is a sectional plan shewing an arrange-'
ment of the valves for a compound engine having a high and a low pressure
cylinder:
Fig. 5 is a longitudinal section shewing the valves applied to an engine having two
cylinders side by side as for a locomotive.
.
Fig. 6 is a transverse section of the same through the steam supply passage and,
Fig. 7 is a transverse section through the exhaust passage. In these figures corre-
sponding parts are marked with corresponding letters of reference.
Referring to Figs. 1 and 2, the slide rod A has attached to it a crosshead B to
which are attached the rods C of the several upper valves D and lower valves E,
each valve being a simple piston fitting a circular hole formed in a partition close to
each cylinder port.
The steam enters at F into the space K surrounding the bodies of the slide valves
which are tubular so that the exhaust from the upper ports passes down through
them to the space G below in which the crosshead B is free to move.
Referring to Figs. 3 and 4, the main slide rod A is attached to two crossheads B B₁
within a cap H, and to these crossheads are attached the rods C of the high pressure
slides D and E and also the rods C' of the low pressure slides D' and E'. At the
top there is a cap H' forming a communication between the upper ports of the two
cylinders, the cap H forming a similar communication between the lower ports.
The steam enters at F into the space K surrounding the bodies of the high pressure
slides; the exhaust from the high pressure cylinder passes directly through the
cap H or H' to the low pressure cylinder, and the exhaust from the low pressure
cylinder passes into the space K' surrounding the bodies of the low pressure slides,
and thence by the exhaust passage G.
The slides in this case are tubular so as to equalise the pressure above and belowin
the spaces H' and H.
Referring to Figs. 5, 6 and 7, the two main slide rods A A' are attached
respective y to crossheads B B' to which are attached the rods CC of a number of
piston slide valves. The steam enters by the spaces K K' surrounding the slide
rods between the two pistons D and E and D and E'. The exhaust steam passes
into a middle space L whence it passes away by G. As shewn in Fig. 5 the slide
rods CC pass through separate stuffing boxes.

page_text: The crossheads B B' might however the accommodated within
a cap indicated by
the dotted lines H, only the two main slide rods.A 'A' passing through stuffing boxes
in the cap.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
elaim, is:
1. Constructing the slide valve of a steam or other fluid pressure engine in several
separate parts each consisting of two connected pistons working through circular
holes close to the cylinder ports, and all the rods of these pistons being connected to
the main slide rod, substantially as and for the purposes set forth.
2. The construction of slide valve for a single cylinder in several separate parts
attached to one main slide rod, each part consisting of two connected pistons working
through circular holes close to the cylinder ports, substantially as described with
reference to Figs. 1 and 2.
3. The construction of slide valves for a compound engine the valve for the high
pressure cylinder in several parts, and the valve for the low pressure cylinder in
several other parts, each of these parts being in the form of connected pistons
working through circular holes close to the cylinder ports, and all these connected
pistons being connected to one main slide rod, substantially as described with reference
to Figs. 3 and 4.
4. The construction of slide valves for two separate cylinders side by side, the slide
valve for each cylinder being divided into several parts, and all the connected
pistons for each cylinder being connected to one main slide rod, substantially as
described with reference to Figs. 5, 6 and 7.
Dated this 4th day of March 1890.
ABEL & IMRAY,
Agents for the Applicant.