Year: 1893

page_text: I, WILLIAM CRAIG of No. 1055, Herkimer Street, Brooklyn in the County of
Kings and State of New York, United States of America, 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 :-
My invention relates to improvements in double-acting pumps in which the
valves are arranged to open inwardly, and are located in close proximity to the
ends of the cylinder.
A practical embodiment of my invention is represented in the accompanying
drawings, in which
Fig. 1 is a horizontal section through the cylinder inlet and discharge
chambers.
Fig. 2 is a vertical section through line x, x of Fig. 1.
Fig. 3 is a vertical section through line y, y of Fig. 1; and
Fig. 4 is a vertical section through line z, z of Fig. 1.
In the form of pump which I have chosen to illustrate my invention, I have
shown the inlet and discharge valves on the same side of the cylinder, but they
might be arranged upon opposite sides, if so desired.
I have also shown the pump arranged to act as a force or compressor pump, and
in the form which I have shown it may be used for moving either aeriform
fluids or liquids.
The pump cylinder is denoted by A, the piston by a, and the piston rod by a¹.
The structure of the cylinder, its piston, and rod, may be of any well known or
approved form.
The cylinder is located in a vertical position, and the inlet and discharge
chambers B and B are located side by side in proximity to one side of the cylinder.
The lower inlet valve is denoted by C, the upper inlet valve by C₁; the lower
discharge valve by D, and the upper discharge valve by D¹.
Their corresponding valve seats are denoted respectively by c, c', d and d'.
The several seats are made removable, and may be screwed into position, the
openings for the reception of the two inlet valves and of the two discharge valves
being located in alignment, one above the other, so that each pair of openings
may be bored and fitted by a single advance movement of the tool.
The valve chambers in which the inlet valves C and C¹ operate, are separated from
one another by a screw cap E, the opening for which may also be provided in
a diaphragm at the bottom of the inlet chamber B, by the same advance
movement of the tool which forms the openings for the reception of the valve
seats. The lower valve chamber communicates with the lower end of the
cylinder A through a port e, and the upper valve chamber communicates with
the upper end of the cylinder through a port e¹. The valves C and C¹ both
move upwardly away from their seats, and are guided by means of central
studs and c, preferably formed integral with the valve seats c and c¹, the
upper ends of the studs being adapted to fit within sockets c and c³, the former
formed in the under face of the cap E, and the latter formed in the under
face of the top cap F, which forms the ceiling of the valve chamber for the
upper valve C
The fluid to be moved, entering through the inlet pipe G into the inlet chamber B,
passes thence either up through the passage-way opened or closed by the upper
valve C', or down into the chamber E underneath the lower valve C, and thence up
through the passage way opened and closed by the said lower valve C to the
cylinder.

page_text: The discharge valves D and D' are also both arranged to lift from their seats,
and the chambers in which they move are separated from each other by a cap H, the
opening for which may be formed in a diaphragm extending across the discharge
chamber, by the same advance movement of the tool which forms the openings for
the valve seats d and d¹. The discharge valves D and D' are guided in their
movements away from, and toward their seats by central studs d and d³, preferably
formed integral with the valve seats, the upper end of the stud d' being received in
a socket d' formed in the under face of the top cap F1, which forms the ceiling of
the chamber in which the valve D¹ operates.
The fluid escaping from the cylinder A, passes into a chamber I, underneath the
lower valve D, thence through the passage way opened and closed by the valve D,
into the discharge chamber B', or into a chamber I underneath the valve D¹, and
thence through the passage-way opened and closed by the valve D', and thence into
the discharge chamber B₁, from which it may pass through an outlet G'.
The operation may be briefly stated as follows:-Supposing the piston to be in
the position shown in Fig. 2, as it moves upwardly it will discharge the fluid above
it, through an upper discharge valve D', into a discharge chamber B', and will, at
the same time, fill the cylinder below it through the lower inlet valve C from. the
inlet chamber B. On its downward stroke, the piston will discharge the fluid below
it, through the lower discharge valve D, into the discharge chamber B', and will,
at the same time, fill the cylinder above it through the upper inlet valve C¹ from
the inlet chamber B.
It will be observed that the ports connecting the interior of the cylinder A with
the valves are short, requiring but slight travel of the fluid being moved; that the
entire set of valves open upwardly, and hence seat under the influence of gravity,
so that there is no derangement of the action of the pump caused by the breaking
or weakening of the springs, and that the valve seats and the separating caps or
plugs are so arranged that access thereto may be conveniently had at any time, and
the necessary fitting for their reception may be made with great facility.
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:
The arrangement of double-acting punip above described, wherein, in combination
with a cylinder and piston, there are two inlet valves in alignment, and separated
by a removable partition in alignment with the valves, two outlet valves in
alignment, and separated by a removable partition in alignment with the valves, an
inlet chamber in open communication with the two inlet valves upon opposite sides
of the partition, an outlet chamber in open communication with the outlet valves
upon opposite sides of the partition, inlet conduits leading from the inlet valves to
the opposite ends of the cylinder, and outlet conduits leading from the opposite
ends of the cylinder to the under sides of the outlet valves, substantially as set
forth.
Dated this 26th day of Sentember 1893
NEWTON & SON,
Agents for the Applicant.