Improvements in Valves for Pulsating Steam Pumps.
Year: 1899

page_text: Date of Application, 14th Nov., 1899
Complete Specification Left, 11th Aug., 1900-Accepted, 15th Sept., 1900
PROVISIONAL SPECIFICATION.
Improvements in Valves for Pulsating Steam Pumps.
I, JOHN BURFORD FOXWELL, of North Parade, Parsonage, Manchester, in the
County of Lancaster, Mechanical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention is designed to provide an improved steam admission or dis-
tributing valve which will allow the bottom of the valve to come to its seat at
the same time as the top.
By my arrangement I obtain a double or duplex movement of the valve which
practically amounts to a parallel motion thereby enabling the valve to oscillate
between the two steam orifices so as to close the whole area of the steam port at
the same time.
I also obtain a more regular and even wear over the surface of the valve and
the adjustment or alteration of the position thereof to compensate for wear.
In carrying out the invention I make the valve annular rectangular hexagonal
or of other suitable shape with two faces in parallel planes. Between the two
faces is formed a groove annular or corresponding to the shape of the valve
which makes the valve somewhat of bobbin shape or the valve may be formed
of a V or rounded edge to fit into a groove in its saddle support.
To support the valve I provide an oscillating saddle or support. This saddle
or support is provided with sides or cheeks between which the valve sits to
prevent its rolling or moving away and missing its faces.
In one form the saddle.rests upon a curved or rounded base to the valve chest.
or chamber and in another form it is provided with pivots at the ends of the
sides thus bringing the lower part considerably below the point of suspension
and the centre of oscillation.
The groove in the valve between the faces rests upon a correspondingly shaped
edge of the saddle or if the groove be made in the saddle the valve rests thereon.
The valve rests upon and is free to oscillate upon the saddle between the side
supports so that as the valve is drawn over to one side or the other the double
movement maintains the faces of the valve to freely adjust themselves to the
seatings.
The aunular or other form of the valve and the corresponding form of the
groove permits of it being turned round or moved to alter its position. Although
the annular form of valve is preferred other forms may be used with a groove on
one two or more sides.
The saddle may be made with distance pieces at the sides and in the ends or
corners of the valve chamber the bearing of the saddle may be made adjustable
by set-screws or the saddle may be provided with an adjustable shoe or otherwise
to compensate for wear.

page_text: Improvements in Valves for Pulsating Steam Pumps.
I, JOHN BURFORD FOXWELL, of North Parade, Parsonage, Manchester, in the
County of Lancaster, 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 is designed to provide an improved steam admission valve for
pulsating steam pumps which will be self-adjusting to its seat top and bottom.
By my arrangement I obtain a double or duplex movement of the valve thereby
enabling the valve to oscillate between the two valve seatings so as to close the
whole area of the steam port at the same time or immediately adjust itself to
the seating.
I also obtain a more regular and even wear over the surface of the valve
facings and the adjustment or alteration of the position thereof to compensate
for wear.
I construct the valve with parallel faces of annular rectangular or other shape
with its central axis coincident with the central axis of the valve seating and
mounted upon an oscillating support so that the valve may be readily turned
round from one position to another say or less part of a revolution to alter its
position relatively to the face of the valve seating.
The invention will be fully described with reference to the accompanying
drawings:
Fig. 1. Sectional elevation of the head of pump and valve chamber.
Fig. 2. Transverse sectional elevation.
Fig. 3. Sectional elevation of valve removed.
Fig. 4. Side elevation of same.
Fig. 5. Sectional elevation of oscillating saddle
Fig. 6. Side elevation of same.
Fig. 7. Plan of saddle.
Fig. 8. Sectional elevation of modified form of valve.
Fig. 9. Side elevation of same.
Fig. 10. Sectional elevation of modification of the saddle.
Fig. 11. Side elevation of same.
Fig. 12. Sectional plan of same.
Fig. 13. Another modification of the saddle.
I construct the valve A of annular rectangular hexagonal octagonal or of
other suitable shape with two faces a and a¹ parallel to each other and to the
vertical axis. I prefer to make the valve annular as it will be more readily
moved or adjusted than if of any other shape. Between the two faces a a¹ is
formed a groove B annular or corresponding to the shape of the valve which
makes the valve preferably somewhat of bobbin shape.
The valve is supported upon an oscillating saddle or support C with a recess e
into which the bobbin shaped valve A fits loosely the projecting parts or arms c¹³
embracing the valve to prevent it rolling or moving away and missing its faces.
The recess may be curved as shown to approximately fit an annular groove
in the bobbin or if the groove be made with 3, 4, 6 or more sides the recess will
be_made of corresponding shape.
In cross section the sides of the recess c and projecting parts c¹ c³ are shaped
to correspond with the shape of the groove B in the valve.
Instead of constructing the valve with a groove B it may be made with a
rounded edge B' as shown in Figs. 8 and 9 or with a V edge to fit into a corre-
sponding groove in the saddle support as shown in Figs. 10 to 12.

page_text: The saddle rests upon a curved or rounded base formed in the bottom of the
valve chest or chamber D upon which it is free to oscillate.
Or in the modification shown in Fig. 13 the saddle is provided with pivots ³
at the upper ends of the projections and thereby bringing the lower part
upon which the valve rests considerably below the point of suspension and the
centre of oscillation. The pivots e³ may be supported in holes in the cover E
of the valve chamber or by sliding journals placed in slots or grooves therein
with set screws to adjust the height for wear.
The valve rests upon and is free to oscillate upon the saddle between the side
supports so that as the valve is drawn over to one side or the other the double
movement permits the faces of the valve to freely adjust themselves to the
seatings.
The annular or other form of the valve and the corresponding form of the
groove permits of it being turned round or moved to alter its position.
The saddle may be made with distance pieces at the sides and in the ends
or corners of the valve chamber the bearing of the saddle may be made adjust-
able by set-screws or the saddle may be provided with an adjustable shoe or
otherwise to compensate for wear.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
-
1. A valve for pulsating steam pumps of annular or other shape mounted
upon a saddle or support and capable of being moved therein around its central
axis substantially as described.
2. The combination with an annular or other valve capable of being placed in
different positions around its central axis of an oscillating supporting saddle with
upwardly projecting arms to support it and retain it in position substantially as
described.
3. A valve for pulsating steam pumps constructed and arranged substantially
as described and shown with reference to either of the figs. of the drawings.
1000
WM. P. THOMPSON & Co.,
Manchester, Liverpool, London, & Birmingham,
Patent Agents.