Year: 1885

page_text: I, EDUARD BLASS, Engineer, residing in Essen on the Ruhr, Prussia, German
Empire, do hereby declare the nature of this invention to be as follows:-
My invention relates to slide-valves and cocks adapted to put one channel
alternately in communication with either one of two other channels, and its object
is to render innocuous any deficiency in the tightness of the slide-valves or cocks
that might give rise to a leakage of fluid from the shut-off channel to either of the
channels communicating with each other, or vice versa.
For this purpose I provide the surfaces of the valves or cocks that work upon
each other, or either of these surfaces, with grooves communicating with the outer
air, and which are so arranged that, when any fluid may happen to leak from one
of the channels into any space between the working surfaces, it will, on its way to
the other channel, meet a groove and pass out into the surrounding air.
The said grooves may with special advantage be applied to slide-valves and cocks
of water-gas apparatuses.
0
I, EDUARD BLASS, Engineer, residing in Essen on the Ruhr, Prussia, German
Empire, 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 slide-valves and cocks adapted to put one channel
'alternately in communication with either one of two other channels, and its object

page_text: is to render innocuous any deficiency in the tightness of the slide-valves or cocks
that might give rise to a leakage of fluid from the shut off channel to either of the
channels communicating with each other, or vice versa.
For this purpose I provide the surfaces of the valves or cocks that work upon
each other, or either of these surfaces, with grooves communicating with the outer
air, and which are so arranged that when any fluid may happen to leak from one
of the channels into any space between the working surfaces, it will, on its way to
the other channel, meet a groove and pass out into the surrounding air.
Fig. 1 of the annexed sheet of drawings represents in section a slide-valve
provided with my improvement. D is the piece containing the channels A, B
and C, and E the slide-valve proper, adapted to put the central channel C alter-
nately in communication with the channels A and B. a, a¹, a² and a³ are the
aforesaid grooves which, in this case, are cut both into the working face of the
piece D, or port-face, and the face of the valve E, the two grooves a and a¹ being
intermediate to the three ports of the pièce D, and the grooves a³ and a³ being by
preference adapted to register alternately with the grooves a and a¹ when the
valve is at either end of its stroke. It will be seen that, when the valve is in the
position shown by the drawing, any fluid accidentally leaking in, either from A or
from C, between the valve-face and the portion of the port-face containing the
groove a, will pass into the channel formed by this groove and the groove a³, and
be conducted out by the same into the atmosphere. When the valve is in the
other extreme position, the grooves a³ and a³ come into operation.
Fig. 2 shows in transverse section a cock having the three ways A, B and C,
one of which may be put alternately in communication with either of the two
other ones, and in which the shell is provided between the ways A, B and C with
the grooves a, a¹ and a³, while the plug has the grooves a³, a and a³. The effect
.of the grooves is, in this case, precisely the same as with the slide-valve.
The said grooves may with special advantage be applied to slide-valves and
cocks of water-gas apparatuses, as these apparatuses are exposed to danger of
explosion if gas passes into the air-conduct, or vice-versa.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:
In slide-valves and cocks having three ways or channels, the arrangement in
both or either of the working faces of the said valves and cocks, of grooves such
as a, a¹, aª², &c adapted to put into communication with the outer air any space
that may exist between the said faces, substantially as and for the purpose
described.
1000