Improvements in and relating to Slide Valves and their Boxes,
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Slide Valves and their Boxes,
We, ALFRED BRAND, of 32, Milton Street, Euston Square, London, and JOHN.
MARK RICHARDS, of Hyndford House, Inglemere Road, Forest Hill, Kent,
Engineers, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to provide a slide valve which shall be partly
balanced, or in other words, the surface exposed to the pressure of the steam shall
be very small as compared with the ordinary type of slide valve, and to provide
adjustable valve faces of slide boxes which can be taken out and scraped with the
slide valve in position and without interfering with it in any way.
The real object of the whole invention, is to produce a slide valve and
valve faces of boxes of the utmost simplicity of construction which can be re-
adjusted and scraped quickly in the case of breakdowns, and also to decrease the
surface exposed to the pressure of the steam, thereby reducing the friction and
increasing the economy of the power engine.
The valve faces are arranged at right angles to any ordinary slide valve face
and the slide valve works between these faces, so that the surface exposed to, say,
steam pressure is the thickness multiplied by the length, not the breadth by the.
length as in any ordinary slide valve. The shape of this slide valve is rectangular
with a rectangular hole made in it. The two valve face boxes can be readily taken
out for the faces to be scraped and re-set without in any way interfering with the
valve itself.
Various changes in the form, proportion, minor details, and the addition of an
expansion valve may be resorted to, without departing from the principles or
sacrificing any of the advantages to this my invention.
H. GARDNER,
Patent Agent, 166, Fleet Street, London.
Agent for the said Alfred Brand and John Mark Richards.
We, ALFRED BRAND, of 32, Milton Street, Euston Square, London, and Joix
MARK RICHARDS, of Hyndford House, Inglemere Road, Forest Hill, Kent,
Engineers, do hereby declare the nature of this invention and in what manner the
Price 8d 1

page_text: same is to be performed to be particularly described and ascertained in and by
the following statement:-
_
The object of our invention is to provide a slide valve which shall be partly
balanced, or in other words, the surface exposed to the pressure of the steam shall
be very small as compared with the ordinary type of slide valve, and to provide
adjustable valve faces of slide boxes which can be taken out and scraped with the
slide valve in position and without interfering with it in any way.
The real object of the whole invention, is to produce a slide valve and
valve faces of boxes of the utmost simplicity of construction which can be re-
adjusted and scraped quickly in the case of breakdowns, and also to decrease the
surface exposed to the pressure of the steam, thereby ensuring saving of fuel and
reducing the friction and increasing the economy of the power engine and also
power of samie.
The valve faces are arranged at right angles to any ordinary slide valve face
and the slide valve works between these faces, so that the surface exposed to, say,
steam pressure is the thickness multiplied by the length, not the breadth by the
length as in any ordinary slide valve. The shape of this slide valve is rectangular
with a rectangular hole made in it. The two valve face boxes can be readily taken
out for the faces to be scraped and re-set without in any way interfering with the
valve itself.
Various changes in the form, proportion, minor details, and the addition of an
expansion valve may be resorted to, without departing from the principles or
sacrificing any of the advantages to this our invention.
Our invention will be well understood by reference to the annexed drawings.
Figure 1 transverse section. Figure 2 longitudinal section. Figure 3 sectional
plan. Figure 4 detached perspective elevation of one of the slide boxes.
A, cylinder of engine.
B, valve box. C, valve reciprocated by the rod D.
E, E, two interchangeable slide boxes in valve chamber F, one on each side of
the valve C with the valve faces rubbing in contact.
G, G, flanges by which and screw bolts H, H, the two slide boxes E, E, are
secured down to the inner flanges I, I, of the valve chamber F. J, J, ingress ports
for the steam or other motive agent to the distributing passages K, K, of the
cylinder for operation against the piston in the ordinary and well known manner.
L cover of the valve chamber for bolting down upon the valve box by the
flanges M, M. N, exhaust ports.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:-
The combination of the two slide boxes E, E, secured in the valve chamber F and
having a reciprocating valve C in contact with the inner faces of same respectively
form the features of novelty in this invention for the purposes described.
111
000
1
P
1000
H. GARDNER,
Patent Agent, 166, Flect Street, London.
Agent for the said Alfred Brand and John Mark Richards.