IMPROVE- MENTS IN SLIDE VALVES
Year: 1885

page_text: I JAMES HARTLEY PROCTOR of 10 Rushton Street, Bolton in the County of
Lancaster, Architect, do hereby declare the nature of my Invention for "IMPROVE-
MENTS IN SLIDE VALVES," to be as follows:-
This invention has for its object improvements in slide valves for the purpose of
relieving the same from the pressure of steam or fluid upon the back side, so as to
reduce or minimise the friction on the valve face as far as is consistent with
maintaining a sufficient contact. I form the valve with a passage through it and
a face at its back which works steam tight upon a plate carried by a piston
working in a cylinder attached to the valve box.cover. The piston and plate are
provided with openings through them, by which steam or other fluid is admitted
from the admission pipe fixed on the outer end of the cylinder on the valve box
cover. For the purpose of making the piston and cylinder steam tight and
reducing the friction, the former is provided with suitable metallic springs, or
rings and springs. The cylinder and plate exclude the steam or other fluid
pressure from the back of the valve more or less according to its area, which varies
according to the class of engine to which they may be applied, i.e. "Condensing,"
or "Non-Condensing."
In this arrangement of valve the construction of new cylinders will be con-
siderably altered, by which the ordinary exhaust port will be dispensed with
through the admission being from the inside or centre of the valve; the outside
edges of the same regulating the exhaust into the valve chest, which in this case
becomes the exhaust chamber.
The cylinder and ports can be arranged so that one slide valve and relieving
apparatus can be applied in the centre or otherwise, or by placing a valve at each
end of the cylinder; the same being worked in the ordinary way by suitable valve
spindles and other usual appliances.
If desired, these improvements can be applied with advantage to existing three
ported or other cylinders, which is accomplished by securing to the valve face
of the cylinder a plate or a valve box provided with two admission ports only,
and by which the centre or other exhaust port is permanently closed.
Dated this 4th day of Ma... 100K

page_text: I JAMES HARTLEY PROCTOR of 10 Rushton Street, Bolton in the County of
Lancaster, Architect, do hereby declare the nature of my Invention for "IMPROVE-
MENTS IN SLIDE VALVES," 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 for its object improvements in slide valves for the purpose
of relieving the same from the pressure of steam or fluid upon the back side, so
as to reduce or minimise the friction on the valve face as far as is consistant with
maintaining a sufficient contact.
In order that my invention may be fully understood and readily carried into
operation I will now proceed to describe the drawings hereunto annexed, the same
letters of reference being used throughout all the figures to indicate the same or
corresponding parts of my invention.
DESCRIPTION OF DRAWINGS.
Fig. 1 is a longitudinal section of a cylinder of an engine with my improvements
in slide valves applied. A is the cylinder; B the admission and emission ports
leading to the ends of the cylinder; C the valve box or chest; and D the valve
box cover.
E is the slide valve with the passage or port G through it; this valve
works or slides on the valve face F, the opposite side or face working against the
plate Hattached to the piston I, the latter being mounted in the cylinder K on
the valve box cover D. The piston I and plate H are provided with the openings J
and L respectively, through which steam or other fluid is admitted from the pipe M
fixed to the outer end of the cylinder K on the valve box cover D. To ensure the
piston I being steam or fluid tight in the cylinder K and to reduce friction to a
minimum the springs N are fitted in the piston I. The plate H on the piston I
excludes the steam or other fluid pressure from the back of the valve E more or
less according to its area, which can be varied according to the class of engine to
which it may be applied. By the arrangement above described for forming a tight
joint the position I is always free to follow up and press against the back of the
reciprocating valve E as the valve faces wear away.
In this modification or arrangement of slide valve the construction of new
cylinders is considerably altered, owing to the ordinary exhaust or middle port
being dispensed with and through the admission being from the inside of the
valve E and port or passage G. The outside edges P of the valve E regulate the
emission of the exhaust from the cylinder into the valve box or chest' C-which in
this case becomes the exhaust chamber-being led away by the pipe R to the
condenser in the case of a condensing" engine, or into the atmosphere in a
"non-condensing" engine. The valve E is reciprocated by the valve spindle V,
the latter being worked in the ordinary way by the usual appliances from the
crank shaft, or other convenient part of the engine.
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Fig. 2 is a modification of my improvements with an admission valve at each
end of the cylinder; each inlet being supplied from the pipe M.
In adapting these improvements to existing three-ported cylinders as in Fig. 3,
the plate W is secured to the valve face F of the cylinder by the set screws ✗ or

page_text: their equivalents, by which the centre or exhaust port Q is permanently closed and
dispensed with. The plate W is provided with the ports B, the admission and
emission being regulated by the reciprocating valve E in a similar manner to that
shewn in Fig. 1. The exhaust is emptied into the valve box or chest C and carried
away to the condenser or atmosphere by the pipe R, which was originally the inlet
to the valve box.
The exhaust pipe is removed from the original outlet or exhaust branch Y to
the pipe R.
In cases where the valve box is cast loose from the cylinder and attached by
bolts or other equivalents I remove the original valve box and replace it with one
as shewn in Fig. 4, which operates in a similar manner to those shewn in Figs. 1
and 3.
Fig. 5 is a sectional elevation of another modification of my improvements, and
Fig. 6 is a sectional plan through line S. T. in Fig. 5 shewing the plate H and
valve E underneath.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
1. The combined arrangement for relieving the back of a slide valve from an
excess of pressure, such combination consisting of the cylinder K, piston I, and
plate H for the back of the valve E to work against, substantially as and for the
purposes herein described.
2. The construction and arrangement for admitting steam or other fluid through
the slide valve E to the cylinder, the exhaust being regulated by the outer edges P
of the said valve, substantially as described and shewn.
3. The use of the plate W with the ports B for the purpose herein set forth.
4. The combination and arrangement of valve box to convert three-ported
cylinders to my improved principle, substantially as described and as shewn in
Fig. 4.
Date the 14th day of Janne 1000