Improved Valve Mechanism for Compression and Vacuum and other Pumps.
Year: 1899

page_text: Date of Application, 27th Apr., 1899-Accepted, 26th Aug., 1899
COMPLETE SPECIFICATION.
Improved Valve Mechanism for Compression and Vacuum and other
Pumps.
I, ERNST WILHELM KOSTER, of the Firm of Maschinengesellschaft Koster & Co.,
of Kochstrasse 73, Berlin, in the Empire of Germany, Engineer and Manager,
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 relates to a piston valve mechanism for compression, vacuum
and other pumps, in which the piston valve regulates the entrance and exit of
the fluids and the slide box is formed so that the suction and pressure spaces for
both sides of the cylinder of the pump are separated from one another.
Thus both sides of the pump can be used for different purposes, to compress
for instance with one side and to suck up with the other.
The annexed drawing represents in section the cylinder of an air pump
provided with such valve mechanism.
The slide box connected with cylinder a by screws which can of course be
unscrewed, consists of two parts 61 and 62 connected together by an intermediate
piece C so that the suction spaces provided with openings S1 S2 and the pressure
spaces provided with openings d² and the valves h¹ h² for both sides of the
cylinder are entirely separated and independent one from another. The entrance
and exit of the fluids is regulated by the piston valve e whose manner of working
during the to and fro movement of the working piston f is as follows:-
At the beginning of the suction stroke that is to say when the working
piston quits its left hand end position, the left piston el of the valve e which
till then closed the left channel g sets the latter free by its movement towards
the right, so that piston f sucks air or gas through the suction opening S¹ into
the cylinder a. At the end of the suction stroke, that is to say when the cylinder
is full, the valve e closes the channel g¹ by its back movement towards the left
in order to re-open it again at the beginning of the pressure stroke whereby it
produces a junction between the cylinder a and the pressure opening as shown
in the drawing. As soon as the fluid is compressed to the tension in the pressure
pipe, the spring valve his opened and the fluid passed into the pressure pipe.
The fluid being expelled valve e¹ closes again the channel gland
immediately after the beginning of the next suction stroke again towards the
other side by going to the right. The valve e moves in this direction so far
that its left piston el goes close to the intermediate piece e and thus pushes
forward or displaces the fluid between its right hand face and the valve h' so
that the same cannot go back into the cylinder a on re-opening channel gl. On
the right side of the cylinder the same events takes place in reversed succession
that is, when piston e¹ connects the left hand part of the cylinder with the pressure
pipe, the piston e² connects the right hand part of the cylinder with the suction
pipe and vice versa.
opens
it
The described arrangement of valve mechanism has moreover the advantage
that the same model of the slide box constructed for a certain suction quantity