Year: 1885

page_text: I, WYBE BRANDSMA of Cappelle on the Yssel in the Kingdom of Holland,
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 :-
The present invention has for its object improvements in the construction of
pump valves especially applicable to pumps of large size designed for drainage,
sewage and similar purposes, but it is also applicable to pumps of smaller
dimensions, water pumps, mining pumps and so forth. The usual valves turning
upon a horizontal shaft, or which lift vertically require very large passage openings
and a large surface in order to obviate the injurious hammering, moreover when
the pump works somewhat quickly and the valves are consequently caused to
change the direction of their motion rapidly the objectionable hammering is still
caused. The construction hereinafter described obviates this hammering altogether
and the pump can work at any given speed and pressure without noise.
Referring to the accompanying drawing which shews a walled in vertical pump
for drainage purposes.
Figure 1 is a view in section through the middle of the pump.
Figure 2 a cross section one half on the line xx and the other half on line y y of
Figure 1.
Figure is a graphic representation of the speed of the pump piston in
comparison with the speed of the shut off rings and the apertures controlled
thereby.
The pump plunger F moves up and down in the cylinder H propelled by crank
shaft G rotated by a steam engine E. On the sides of the cylinder H are two slide
boxes A A'. These boxes consist of two halves separated by a partition K. In
each of the slide boxes is placed a cylinder B open above and below, provided with
two rows of trapeziform openings Z. These openings are so arranged that through
each row of the same, a connection is established between one half of the slide box
and the interior of the cylinder B. In this a cylindrical slide C can move up and
down, which is cut away sideways at top and bottom and is open. The motion of
this is effected by the shaft G. The cranks are connected at an angle of 90 degrees
with reference to the plunger F and at an angle of 180 degrees with regard to each
Dmine 21

page_text: other. By the arrangement of trapeziform openings in B and the sloping cut
slide C a maximum opening is secured even at the commencement of the stroke.
The apparatus works as follows.
The plunger F (Figure 1) moves downwards whereby a drawing in of the liquid
to the space above it and a corresponding pressing out of that below it is effected,
consequently the liquid flows from the space on the right as indicated by the
arrows through the openings z and the upper part of A¹ into the cylinder H above
the plunger F, which presses simultaneously the water underneath it into the under
half of A and through the openings Z into the discharge pipe N. When the
plunger ascends the water above it is in turn forced into N, while fresh water flows
in under the plunger.
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
A pump in which the ordinary valves are replaced by cylindrically shaped
slides C which move in cylinders B placed in the valve box A having above and
below trapeziform openings 2, whereby the motion is communicated by cranks on
the main pump shaft fixed at an angle of 90 degrees with respect to the plunger
crank and at an angle of 180 degrees with respect to each other.