IMPROVEMENTS IN VALVES APPLI- CABLE FOR THE AIR AND CIRCULATING PUMPS OF STEAM ENGINES AND FOR OTHER PURPOSES
Year: 1879

page_text: LETTERS PATENT to Charles Mattathias Jacobs, of Bute Works, Cardiff, in the
County of Glamorgan, for the Invention of "IMPROVEMENTS IN VALVES APPLI-
CABLE FOR THE AIR AND CIRCULATING PUMPS OF STEAM ENGINES AND FOR
OTHER PURPOSES."
Sealed the 1st July 1879, and dated the 20th January 1879.
PROVISIONAL SPECIFICATION left by the said Charles Mattathias Jacobs at
the Office of the Commissioners of Patents on the 20th January 1879.
"
CHARLES MATTATHIAS JACOBS, of Bute Works, Cardiff, in the County of
Glamorgan. IMPROVEMENTS IN VALVES APPLICABLE FOR THE AIR AND CIRCU-
LATING PUMPS OF STEAM ENGINES AND FOR OTHER PURPOSES."
This Invention has for its object improvements in valves applicable for the air
and circulating pumps of steam engines and for other purposes.
The valves of the air pumps and circulating pumps of steam engines are now
ordinarily formed of a flexible disc of vulcanized india rubber lying over and closing
the openings in a circular grating, the disc being held to the centre of the grating
but around its circumference allowed to turn freely upwards away from the grating
to allow of the passage of fluid through the openings in it. In place of forming the
valves in this manner I employ, instead of the flexible disc of vulcanized india
rubber, held at its centre to the grating, a disc of wood, which is free to rise a
distance entirely away from the grating. To strengthen the disc and to hold it in
form I place above it a circular metal plate, having around it a descending rim
to embrace the outer edge of the disc, and so keeping the disc in form; the face of
the disc of wood projects beyond this rim, so that the rim does not prevent the disc
of wood from resting upon the top of the grating.
The wooden disc is retained at its centro to the metal plate by a projecting
collar on a tubular brush which is screwed into a hole in the centre of the plate.
The collar is received into a recess in the face of the wooden disc so as not to pro-
ject beyond the face.
A short stands up from the centre of the face of the grating, as heretofore;
this tube has a screw thread cut on its exterior, on to which screws a tubular nut ;
the exterior of the tubular not forms a guide for the moving portion of the valve to
make it rise and fall truly; it passes through and fits loosely within the central
brass busling of this valve. At the top of the tubular nut is a projecting flange
which forms a stop to limit the lift of the valve. A ring of vulcanized india rubber
is carried in and projects from a groove in the face of the collar that acts as a
stop and serves to prevent noise when the valve lifts and comes up to the stop.

page_text: Figure 1 is a transverse section and Figure 2 is a plan partly in section of a valvo
constructed according to my Invention, and adapted especially for the delivery
valve of an air pump; Figures 3 and 4 show a similar valve adapted for an air
pump bucket.
a is the grating; b is the disc of wood closing against the grating, and c is the
piston rod.
To strengthen the disc b and to hold it in form I place above it a circular metal
plate b, having around it a descending rim 61x to embrace the outer edge of the
disc, so keeping the disc in form; the face of the disc of wood projects beyond this
rim, so that the rim does not prevent the disc of wood from resting upon the top
of the grating.
The wooden disc is retained at its centre to the metal plate by a projecting
collar on a tubular bush 62, which is screwed into a hole in the centre of the plate
b. The collar is received into a recess in the face of the wooden disc b, so as not to
project beyond the face.
A short tube a' stands up from the centre of the face of the grating as heretofore ;
this tube has a scrow thread cut on its exterior, on to which screws a tubular nut a³;
the exterior of the tubular nut forms a guide for the moving portion of the valve to
make it rise and fall truly; it passes through and fits loosely within the central
brass bushing of this valve. At the top of the tubular nut is a projecting flange
a2x, which forms a stop to limit the lift of the valve. A ring of vulcanized india
rubber a* is carried in and projects from a groove in the face of the collar a** that
acts as a stop and serves to prevent noise when the valve lifts and comes up to
tho stop.
In the case of the air pump bucket the tubular nut a³ is screwed directly upon
the piston rod.
Having thus described the nature of my said Invention and the manner of per-
forming the same, I would have it understood that I claim my improvements in
valves applicable for the air and circulating pumps of steam engines and for other

page_text: purposes, such valves consisting of a metal grating and of a disc of wood strengthened
and held in form by a metal case or frame, such disc being free to rise a distance
entirely away from the grating, substantially as described.
In witness whereof, I, the said Charles Mattathias Jacobs, have hereunto set
my hand and seal, this Sixteenth day of July, in the year of our Lord One
thousand eight hundred and seventy-nine.
CHARLES MATTATHIAS JACOBS. (Ls.)