Improvements in Stop-valves.
Year: 1893

page_text: Date of Application, 10th Feb., 1893
Complete Specification Left, 7th Nov., 1893-Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Stop-valves.
We, JOHN ADDY HOPKINSON, and JOSEPH HOPKINSON, both of the Firm of
J. Hopkinson & Co., of Huddersfield, in the County of York, Engineers, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to stop valves for steam and other fluids and is designed to
further improve valves such as those described in the Specifications of former
Patents granted to us viz., No. 4017 A.D. 1883, No. 3144 A.D. 1884, No. 8147
A.D. 1884, No. 968 A.D. 1886, No. 15905 A.D. 1889, and No. 14098 A.D. 1891.
The chief objects of our invention are to increase the efficiency and con-
venience of our stop valves by providing means for quickly opening and closing
the valve, and at the same time for plainly indicating whether the valve is open or
closed.
We have in the Specifications of the above mentioned prior Patents described
and shown stop valves having spindles formed in two parts, one of which extends
outside of the casing and is capable of rotative movement only, and provided with
means for turning it on its axis, whilst the other part which is connected to the valve
proper does not rotate but is capable of endwise movement.
According to our present invention we modify the above arrangement by forming
each part of the said spindle with a screw-thread and so combining the same with
the valve proper, and the other parts of the apparatus, that by turning the outer
part of the same, both parts will receive an endwise movement, and the rate of
movement of the valve will equal the sum of the movements of the two parts of the
spindle.
The outer end of the spindle will show very clearly the fact of the valve being
open or closed, and we may provide for showing how much it is open by means of
an index and pointer.
One mode of carrying our invention into effect as applied to some of the various
forms of valves described in the aforementioned Specifications in which the threads
are exposed to the fluid pressure is as follows, that is to say, we provide the valve
casing with a removable lid or cover, in which is constructed a stuffing box, and
which is screw threaded internally at its lower end to receive and serve as a fixed
nut for the screw-threaded outer part of the two-part spindle. The upper end of
this part of the spindle is plain and passes through the gland, and on its outer end
is secured the hand wheel for rotating the same. The said outer part of the spindle
is made hollow and is screw-threaded internally to receive the screw-threaded part
The
of the inner spindle which is connected with the valve and cannot rotate.
screw-threads of the said inner spindle are preferably made left handed, and those
in the lid or cover right handed.
In a modified construction applicable to a stop valve having a trunk spindle such
as shown for example in the prior Patent Specification No. 14098 of 1891, that is
to say, a valve in which the screw-threads of the spindle are not exposed to the fluid
pressure, we make the outer rotative spindle with two screw-threads, the lower part
which screws into the trunk having a left handed thread, and the upper part which
screws through the cross-head having a right handed thread.
In both the described constructions the valve receives a quick movement
and is fully opened or closed with fewer turns of the hand wheel than in con-
structions heretofore made. There is also less liability to endwise play or

page_text: slackness, and less wear and tear is produced, thus increasing the efficiency of
the valve.
Dated this 10th day of February 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Stop Valves.
We, JOHN ADDY HOPKINSON and JOSEPHI HOPKINSON, both of the Firm of
J. Hopkinson & Co., of Huddersfield, in the County of York, Engineers, 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:-
Our invention relates to stop valves for steam and other fluids and is designed
to further improve valves such as those described in the Specifications of former
Letters Patent granted to us viz., No. 4017 A.D. 1883, No. 3144 A.D. 1884,
No. 8147 A.D. 1884, No. 968 A.D. 1886, No. 15905. A.D. 1889, and No. 14098
A.D. 1891.
The chief objects of our invention are to increase the efficiency and convenience
of our stop valves by providing improved means for opening and closing the valve,
and at the same time for plainly indicating whether the valve is opened or closed.
We have in the Specifications of the above mentioned prior Patents described
and shown stop valves having spindles formed in two parts, one of which extends
outside of the casing and is capable of rotative movement only, and provided with
means for turning it on its axis, wbilst the other part which is connected to the
valve proper does not rotate but is capable of endwise movement.
According to our present invention we modify the above arrangement by forming
each part of the said spindle with a screw-thread and so combining the same with
the valve proper, and the other parts of the apparatus, that by turning the outer
part of the same, both parts will receive an endwise movement, and the movement
of the valve proper will equal the sum of the movements of the two parts of the
spindle.
The outer end of the spindle will show very clearly the fact of the valve being
open or closed.
We may provide for showing how much the valve is open by
means of an index and pointer.
In the accompanying drawing we have shown one mode of carrying our inven-
tion into effect as applied to a form of valve in which the screw threads of the
valve spindle are exposed to the fluid pressure. The valve is shown in vertical
central longitudinal section.
A is the valve casing, B is the valve proper which consists of two parallel discs
or plates pressed against their seats by an internal spring in the now well-known
manner.
We provide the valve casing A with a removable lid or cover C which supports
another movable lid or cover D in which is constructed a stuffing box E. Said stuffing
box is preferably of the type described in the Specifications of prior Patents No. 8385
A.D. 1891, and No. 10526 A.D. 1893 both granted to ourselves, but we do not confine
ourselves to this particular kind of stuffing-box. The lid or cover D is screw-
threaded internally at its lower end to receive and serve as a fixed nut for the screw-
threaded outer part F of the two part valve spindle. The upper end of this part
of the spindle is plain and passes through the packed gland, and on its outer end
is secured the hand wheel G for rotating the same. The said outer part of the
spindle is made hollow and is screw-threaded internally to receive the screw-
threaded inner part H of the two part spindle, which part H is connected to the

page_text: valve in the usual manner and cannot rotate. The screw-threads of the said inner
spindle H are preferably made left handed and those in the lid or cover D right
handed.
With this construction of spindle there is less liability than in valves of this
type heretofore made to end wise play or slackness, and less wear and tear is
produced, thus increasing the efficiency of the valve; moreover the valve receives
a quick movement and is fully opened and closed with fewer turns of the hand
wheel than in constructions heretofore made.
in some
When opening and closing the valve, the outer spindle F rises and falls through'
the gland and will thus indicate the position of the valve. We may
instances as before stated provide an index or pointer as a further means to show
the lift and position of the valve.
In some instances the lids or covers C and D may be made in one casting.
In a modified construction applicable to a stop valve having a trunk spindle
such as shown for example in the prior Patent Specification No. 14098 of 1891,
that is to say, a valve in which the screw threads of the spindle are not exposed
to the fluid pressure, we make the outer or rotative spindle with two screw threads,
the lower part which screws into the trunk having preferably a left handed thread,
and the upper part which screws through the cross-head having a right-handed
thread.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
1. A stop valve having a spindle constructed in two parts, one part being con-
nected with the valve proper and having an end wise movement only, and the
other or outer part having both an endwise and a rotative movement for the
purpose specified.
2. A stop valve provided with a two part spindle so arranged that the part
connected with the valve proper is incapable of rotation and scr vs into the outer
rotative part, which latter screws into a stationary nut fixed to the valve casing,
substantially as described, and for the purpose specified.
3. A stop valve constructed substantially as described with reference to the
drawing, and operating as specified.
Dated this 7th day of November 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.