IMPROVEMENTS IN VALVES
Year: 1884

page_text: I FRIEDRICH WECK of Lilleshall in the county of Salop Engineer do hereby
declare the nature of the said invention for "IMPROVEMENTS IN VALVES " to be
as follows:-
This invention relates to improvements in that class of valves which are operated
by a screw.
In carrying out my invention, the spindle operating the slide or valve is cut with
a right and left handed screw thread, of equal or different pitches; the outer screw
thread works in a nut fixed to the casing of the valve, and the other screw thread
works in a nut or female screw thread in the slide or valve.
By this arrangement it will be obvious that when the spindle of the valve is
turned it and with it the slide or valve will move in the same direction axially the
slide or valve however moving through a greater distance than the spindle whereby
in the case of large valves, the position of the valve may be indicated with a
comparatively short portion of the unprotected screw protruding outside the valve
casing.
The plain portion of the spindle (between the two screw threads) works in a
stuffing box in the usual manner.

page_text: I, FRIEDRICH WECK, of Lilleshall, in the county of Salop, Engineer do hereby
declare the nature of the said invention for "IMPROVEMENTS IN VALVES" 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 improvements in that class of valves which are operated
by a screw.
In carrying out my invention, the spindle operating the slide or valve is cut with
a right and left handed screw thread, of equal or different pitches; the outer screw
thread works in a nut fixed to the casing of the valve, and the other screw thread
works in a nut or female screw thread in the slide or valve.
The plain portion of the spindle (between the two screw threads) works in a
stuffing box in the usual manner.
In order to enable my invention to be fully understood I will proceed to describe
the same by reference to the accompanying drawing in which figure 1, is a
longitudinal section of a slide valve for pipes constructed according to my
invention; figure 2, is a cross section of the same and figure 3, a sectional plan
on line A B of figure 2. In figure 1, the valve is shewn open and in figure 2, the
valve is shewn closed. Similar letters in all the figures represent similar parts.
a, is the spindle of the slide or valve b; the said spindle is cut with right and
left handed screw threads c, and d, respectively. In the drawing the screw threads
are shewn of equal pitches but it will be obvious that they may be of different
pitches. The screw thread c, works in a nut e, fixed rigidly to the valve casing f,
and the other screw thread d, works in a nut g, inside the valve and preferably
placed as shewn in the drawing near the centre of the slide b.
By this arrangement it will be obvious that when the spindle a, of the valve b,
is turned, it, and with it the slide or valve b, will move in the same direction
axially, the slide or valve however moving through a greater distance than the
spindle whereby the valve may be fully opened with but a comparatively short
portion of the unprotected screw protruding outside the valve casing.
I have described my invention as applied to a slide valve for pipes but it will be
obvious that the invention is equally applicable to other kinds of valves which are
operated by a spindle.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is --
(1). A valve or slide operated by means of a spindle having a right and a left
handed screw thread of equal or different pitches the said screw threads working in
corresponding nuts in the casing of the valve and in the slide or valve respectively
as hereinbefore described.
(2). The improved slide valve hereinbefore described and represented in the
accompanying drawing.