Improvements in Valves.
Year: 1892

page_text: Date of Application, 28th May, 1892
Complete Specification Left, 27th Feb., 1893-Accepted, 15th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Valves.
I, OTTO SCHWADE of Karthäuserstrasse 55 Erfurt, Germany, Engineer, do
hereby declare the nature of this invention to be as follows :-
The object of this invention is to provide means for rendering visible the move-
ments of the valve and enabling the extent of such movements to be ascertained
whilst at the same time allowing the amount of lift of the valve to be regulated.
For this purpose I place over the valve spindle or an extension thereof a glass
tube closed at its outer end on which is provided a scale of divisions. This glass
tube (hereinafter referred to as a sight glass) by reason of its transparency allows
of inspection of the working of the valve.
The valve spindle or its extension is preferably provided at its upper end with an
enlargement or with a cap which may be made of elastic material, and which fits
inside the sight glass. The spindle or extension is made of such a length that in
the position of rest and during the working of the valve it will be visible outside
the valve casing. The sight glass passes through a suitable stuffing box in the
cover of the valve casing and can be adjusted in the said stuffing box in a longitu-
dinal direction. As the sight glass is longitudinally movable in the stuffing box
and is closed at the top, the lift of the valve may, in some instances, if desired be
regulated, that is to say, be diminished or increased by suitably adjusting the sight
glass. The sight glass is of such size that the valve extension and the cap can
work freely in the same, and air or liquid can circulate in the interior thereof.
Dated this 28th day of May 1892.
OTTO SCHWADE,
By L. W., per F. B.
COMPLETE SPECIFICATION.
Improvements in Valves.
1, OTTO SCHWADE of Karthäuserstrasse 55 Erfurt, Germany, Engineer, 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:-
The object of this invention of improvements in valves is to provide means for
rendering visible the movements of the valve and enabling the extent of such move-
ments to be readily ascertained whilst at the same time allowing the amount of lift
of the valve to be regulated.
In the accomanying drawings,
Figs. 1 and 2 are vertical sections of valves embodying this invention.
In each case a is the valve proper enclosed in a case a and from which extends a
spindle b. This spindle may either rest in a recess in the top of the valve as in
Fig. 1, or be formed in one with the valve as in Fig. 2.
Over the spindle or extension, as the case may be, is placed a glass tube e that is
closed at its outer end and on which is provided a scale or division f. This tube
(hereinafter referred to as a sight glass) being transparent enables the working of
the valve to be inspected.
"
The spindle or extension is preferably provided at its upper end with an
enlargement, or with a cap c which may be made of soft material, and which fits
inside the sight glass e. The spindle or extension is made of such a length that in

page_text: its position of rest and during the working of the valve, it will be visible through
the sight glass. The sight glass passes through a suitable stuffing box g in the
cover d of the valve casing and can be adjusted in the said stuffing box in the
direction of its length. This arrangement enables the lift of, the valve, in some
instances, to be regulated, if desired, that is to say, to be diminished or increased by
suitably adjusting the sight glass e. The sight glass is of such size that the valve
spindle or extension and the cap c can work freely in the same, and air or liquid
can circulate in the interior thereof.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A valve provided with a sight glass arranged to extend through the valve
case, closed at its outer end and into which extends a spindle or stem extending
from the upper part of the valve proper, the arrangement being such that the
movements of the valve can be observed substantially as hereinbefore describel.
2. My improved valves constructed with an adjustable sight glass e a spindle or
extension & substantially as herein before described with reference respectively to
and shown in Fig. 1 and in Fig. 2 of the drawings annexed.
Dated this 27th day of February 1893
OTTO SCHWADE,
By L. W., per W. C.