Improvements in Stop Valves.
Year: 1895

page_text: Date of Application, 25th Sept., 1895-Accepted, 26th Oct., 1895
Improvements in Stop Valves.
"I, EMIL HERMANN NACKE, of Koetitz, near Coswig, in the Kingdom of Saxony
and the Empire of Germany, Machine-maker, 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 stop valves of the kind in which a movable tubular
piece is provided which, when the valve is in its closed position, is caused to press
the valve against its seat so as to make a very tight joint.
In the accompanying drawings,
Figs. 1 and 2 are respectively a cross section and a longitudinal section of a
valve provided with my improvements;
Fig. 2 shews a detail.
Figs. 3 and 4 are similar views io Figs. 1 and 2, of a modification of the
arrangement shown in those figures.
Referring to Figs. 1 and 2, a is the sliding valve which is at right angles to the
valve passage; c is a tubular piece that has an internal diameter equal to that of
the valve-passage and is screwed into the valve casing with its axis coincident
with that of the valve. This tubular piece will be pressed against the valve a or
be withdrawn from it, according as it is rotated in one or the other direction by
means of teeth provided on one end of the tubular piece. In these teeth c
engage the teeth of a piece f, the axle of which is fitted so as to make a fluid-
tight joint in the wall of the valve-casing. The piece is provided, outside the
casing, with a lever d, by turning which the tubular piece e is, by means of the
teeth of the piece f, moved longitudinally to and fro and consequently screwed up
to the valve or away from the same.
In order to be able also to open and to close the valve by turning the lever d,
the toothed piece fis provided with a lateral piu g, which engages in an eye at
the top of a ring that fits loosely around the valve a. The said eye is somewhat
longer than it is broad, as shown in Figs. 1 and 2; and when the pin g has almost
reached its lowest position (Figs. 2 and 2) and has consequently closed the
valve a, the teeth of the piece begin to engage with the teeth c¹ of the tubular
piece c. If the pin g be new moved for a short distance beyond its lowest position,
by turning the lever d still further in the closing direction, the tubular piece c will
be partly revolved and thereby screwed up to the valve a to such an extent that
the latter will be pressed tightly against its seat. During this pressing action,
the pin g will not move the valve a, because the ring will rotate around the
valve a and the eye of the ring is so shaped that the pin g can be moved a
short distance beyond its lowest position without acting on the valve a. In
opening the valve a, the tubular piece c is turned by the teeth of the piece for
such a distance, that the slide a is relieved from all pressure against its seat before
the pin g raises the valve a by means of the ring h.
The movements of the valve a and the tubular piece c just described will occur
in due succession by simply turning the lever d in the one or in the other
direction, the amount of turning necessary to move the valve from its completely
closed and secured position to its completely open position amounting to a little
more than 180°. The position of the lever indicates whether the valve is
completely or partly closed, or is open.
Fig. 4 is a cross section and Fig. 5 a longitudinal section of a modification of

page_text: the above described arrangement, which modification I prefer to employ in the
case of valves that exceed certain dimensions and therefore require greater power
for working them, or that are used for controlling high pressure steam or other
fluid.
In this case I employ the lever d only for moving the toothed piece f-that is
to say, for moving the tubular piece c in order to press it against the valve a or
to withdraw it therefrom, the valve itself being moved by a special screwed
spindle o.
The position of the external lever d will in this arrangement indicate whether
the tubular piece c is pressed against the valve or is withdrawn from the same.
If the lever d rests against the stop i, the tubular piece c is withdrawn; if it is
in the position indicated in dotted lines, the tubular piece c is pressed against the
valve. The manipulation of this arrangement is as follows:-
If the valve a is to be opened, the lever d is moved from the position indicated
in dotted lines into that shown in full lines, so that it rests against the stop i, and
the valve is then opened by means of the spindle o. If the valve is to be closed,
care should be taken to ascertain that the lever d rests against the stop i; the
slide is then closed by means of the spindle o, the lever d being afterwards turned
in the direction of the position shown in dotted lines until the tubular piece c
presses the valve a against its seat.
In place of the lever d, a spur wheel may be employed and be arranged to be
rotated by means of worm or other gear; or any suitable mechanism may be
employed for moving the axle b.
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
so
1. A stop valve comprising a valve proper a, a tubular piece c screwed into the
valve-casing at right-angles to the direction of motion of the valve, and provided
with teeth on its periphery, and meaus comprising a toothed piece f having an
axle b and a lever d (or its equivalent) for partly rotating the tubular piece
as to press it against or withdraw it from the valve a, the toothed piece being
provided with a pin g that engages in a ring surrounding the valve a and opens
and closes the said valve, substantially as herein before described.
2. A modification of the arrangement referred to in Claim 1, in which the pin g
is dispensed with and the closing and opening of the valve a are effected by a
spindle o, the pressing of the valve against and the withdrawal thereof from its
Beat being effected by a toothed piece through its axle b, lever d (or equivalent),
and tubular piece c, substantially as herein before described.
'
3. Valve apparatus constructed and operating substantially as described with
reference to Figs. 1, 2 and 3, or to Figs. 4 & 5 of the accompanying drawings.
Dated this 25th day of September 1895.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.