Improvements in and relating to Rotary Valves,
Year: 1898

page_text: Date of Application, 16th Sept., 1898-Accepted, 12th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in and relating to Rotary Valves,
We, WILHELM NACHTIGALL and GUSTAV JACOBY, both of 13 Kohlgartenstrasse,
Leipzig, Reudnitz, in the German Empire, Manufacturers, 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 an improved construction of rotary valve. In rotary
valves which are employed, for example in shutting off steam or water, as in
water gauge cocks for steam boilers, inconvenience frequently arises from the
contact surfaces becoming furred or oxidized and a complete shutting off of
the valve being thereby prevented.
This inconvenience can only be obviated by making the contact surfaces
capable of being withdrawn or released during working. For this purpose, and
according to our invention, the rotary valve is operated by an auxiliary movable
spindle, on which is a wedge shaped" piece so arranged that on the drawing out
of the spindle, the rotary valve is pressed against its seat.
Upon the accompanying sheet of drawings:
Figure 1 is a cross section through the valve in the closed condition.
Figure 2 being a similar view but the passage being shewn open.
Figure 3 is a longitudinal section through the rotary valve.
The rotary valve A is rotated by means of the handled spindle B. The spindle
is also movable in the direction of its axis. Upon the spindle is a wedge or
block C. Should the spindle be moved axially in the direction of the arrow,
the wedge C is drawn under the packing plug D (see Figure 3) and forces
the same against the outlet opening of the valve.
In operation, this axial movement of the spindle is effected by means of the
steam pressure within the body of the valve. The force with which the packing
plug is pressed is therefore dependent on the pressure prevailing within the
body and the inclination of the wedge or block. This pressure, can however,
be altered at will during working independently of the position of the rotary
valve, by the spindle being pressed inwards or forcibly pulled out. It is therefore
possible to remove from the seat the slime or fur which may have accumulated
there, and to reseat the plug D whilst the valve is in use.
The removal of slime or fur is effected in the following manner.
The spindle is pressed inwards and the pressure on the plug thereupon ceases:
the latter can then be easily withdrawn, bevond the laver of slime. In drawing
out the spindle, the plug is forcibly pressed outwards, the valve rotated back-
wards and forwards and the slime thereby scraped away. The seating of the
plug during working is effected by vigorously drawing out the spindle whilst
the valve is rotated backwards and forwards.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
F
1. A rotary valve, in which an axially movable spindle presses on a movable

page_text: packing plug by means of a wedge, if the spindle be pressed outwards by means
of the steam pressure prevailing in the body of the valve, and in which this
pressure on the packing plug can be varied at will by drawing out the spindle
or pressing it in with the hand, whereby the removal of slime or fur from the
seat and the reseating of the packing plug are rendered possible during working.
2. In a rotary valve, the combination with a rotable and axially movable
spindle B, of a wedge or block C fitted to the latter, and of a packing plug capable
of being forced against the valve outlet by the said wedge on the spindle, sub-
stantially as and for the purposes described.
Dated this 16th day of September 1898.
For the Applicante,
CENCE e
CENCE & TEEXY
60, Queen Victoria Street, London, E.C., Chartered Patent Agents."