Improvements in Throttle or Stop Valves for Steam-engines.
Year: 1886

page_text: : Improvements in Throttle or Stop Valves for Steam-engines.
"
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for IMPROVEMENTS IN THROTTLE OR STOP VALVES FOR STEAM-
ENGINES" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
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This invention relates to improvements in that class of throttle or stop valves in
which the valve chamber is cylindrical and has an opening at one side, and the
valve is of a segmental shape and concentric with the cylindrical valve chamber,
and is adapted to be turned therein to open or close the opening for the passage of
steam.
In the usual construction of this class of valve, a spindle extends longitudinally
and concentrically through the chamber, by means of which the valve is turned,
and the valve is adapted to engage the spindle so that the turning of the spindle
will turn the valve; to hold the valve against the surface of the cylinder when the
steam pressure is not sufficient for that purpose, or when the valve is turned away
from the opening, a spring is introduced between the spindle and valve, creating
necessarily a very considerable pressure between the valve and spindle, and. a
corresponding friction upon the spindle in its bearings.
The object of my invention is to make the support of the valve entirely indė-
pendent of the spindle, and it consists in the use of a cylindrical valve chamber,
into which steam is admitted; having an opening through which the steam inay
pass to the cylinder, combined with a valve, consisting of a segment of a cylinder,
corresponding to the interior of the valve chamber and having circumferential
extensions therefrom, forming one or more divided rings to extend around the
interior of the cylinder, and a valve spindle arranged in bearings and concentric
with the chamber and valve, free" connections being arranged between the said
TD 71

page_text: valve, as more fully hereinafter described.
In the accompanying drawing,
Figure 1 is a side view looking toward the end of the valve case.
Figure 2 is a top view of the same.
Figure 3 is a vertical central section cutting through the valve chamber at right
angles to its axis.
Figure 4 is a vertical central section through the valve chamber on line < x of
Figure 3.
Figure 5 is a perspective view of the valve detached.
I show the shell of the throttle or stop valve made as an integral part of the
shell of the governor-valve, A representing the governor-valve shell, and B the
throttle or stop valve shell. This peculiar construction of shell constitutes the
subject of another application bearing the same date as the present application.
The throttle or stop valve chamber D is cylindrical throughout, and is provided
with a head E at one end and a similar head F at the opposite end. G is the
valve-spindle, which extends through a stuffing-box arrangement and the head F,
into the opposite head longitudinally through and concentric with the valve
chamber. His the inlet to the valve chamber. I an opening from the chamber
which leads to the governor valve chamber, or to the cylinder as the case may be.
Jis the valve, which is a segment of. a cylinder, the diameter of which
corresponds substantially to the internal diameter of the valve chamber, and is of a
length and width sufficient to cover the opening I, as indicated in broken lines,
Figure 3.
From the edges of the valve circumferential extensions K K are formed, pre-
ferably two on each side, and these extensions come nearly together, forming
divided ring like connections between the two edges of the valve, these extensions
substantially completing the circle and corresponding to the interior of the
valve chamber. The division permits a considerable degree of elasticity to the
extensions K K, so that as the valve is introduced into the cylinder the extensions
will be somewhat compressed, their elasticity tending to force the valve upon the
surface of the cylinder; and they also serve as guides and supports for the move-
ment of the valve independent of the spindle, that is to say, the valve is located in
the cylinder so independent of the spindle that it will maintain its position in the
chamber whether or not the spindle be present.
.
The spindle is provided with one or more radially projecting arms L L corre-
sponding to the recesses M M on the valve, so that they may set therein, as seen in
Figure 3, and so that as the spindle is turned, the arms will engage the valve and
impart corresponding rotation to it. Suitable collars P P are introduced onto the
spindle at each end of the valve, to hold it in its proper position longitudinally.
By this construction the valve may be introduced and fitted to its place in the
chamber independently of the spindle, a very great convenience in fitting the valve,
or assembling the parts.
The spring extensions readily take up any wear which may occur upon the face
of the valve, so that it is sure to always maintain its proper position in the
chamber, and being thus supported entirely independent of the spindle, there is no
friction upon the spindle independent of its own bearings, and the friction is not
effected by the steam pressure in the valve chamber.
The valve spindle is provided with a suitable handle R, or other device, by
which it may be rotated to open, close or adjust the valve.
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Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to me
by my foreign correspondent I declare that what I claim is
The herein described improvements in a throttle or stop valve consisting of, the
cylindrical valve chamber D, having an inlet passage thereto for the admission of

page_text: steam and an opening for its exit, combined with a spindle G passing longitudinally
and concentrically through said chamber, and supported in suitable bearings, and
with the valve J in the shape of the segment of a cylinder corresponding to the
cylindrical shape of the chamber, and constructed with circumferential extensions
from its edge, forming one or more divided rings corresponding to the internal
circumference of the cylinder, the said spindle being provided with one or more
radial arms L, and the valve with one or more corresponding recesses M, sub-
stantially as described.
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