Improvements in Stop Valves.
Year: 1897

page_text: Improvements in Stop Valves.
We, JOSEPH HOPKINSON, and J. HOPKINSON & Co., LIMITED, both of Britannia
Works, 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 with removable seats and has for its objects
to ensure fluid-tight joints between the metal of the seat and that of the valve
casing and also to facilitate the insertion and removal of the valve and seat when
necessary. The seat is formed at the lower or inner end of a cylindrical frame
or cage the upper end of which has an annular surface which fits accurately in the
part of the casing immediately below the cover. The valve is placed within the
cage which is so constructed as to allow a free passage of the water or other
fluid through it.
In valves provided with seats of this kind it is obviously difficult to ensure the
fluid-tight contact of the surfaces at the upper and lower parts of the cage.
Stop valves have been made with removable seats which have the cage or frame
secured by screw threads in the neck of the casing. Others have had the cage
provided with packing at the upper end so arranged that when the cover is screwed
down to secure the seat in its place it presses upon a ring of packing at the said
upper end.
But these and other arrangements heretofore adopted have not proved satis-
factory. We have therefore sought to accomplish the desired result by totally
different means which we will now describe.
We form the seat upon the lower or inner end of a suitable frame or cage which
at its upper or outer end is formed with an annular portion that occupies the space
within the upper part of the neck of the casing.
The peculiar formation of these parts is the important feature of our invention
as will be understood from the following description that is to say:-
According to our invention we dispense with screw-threads and with packing-
boxes or other contrivances which necessitate the attachment of the cage to the
casing otherwise than by the simple contact of their surfaces. And by the employ-
ment of taper or inclined surfaces at the upper end of the cage in combination
with the valve-seat at the lower end thereof, we avoid the difficulty usually
experienced in attempts to obtain fluid-tight joints at two different parts with
surfaces at different angles to each other.
In one form of our invention the aforesaid annular portion of the cage is made
taper on its outer and inner peripheries its largest diameter being at the top and
its smallest outside diameter being somewhat larger than that of the body of the
cage so that the entire cage can be readily inserted into the casing and withdrawn
therefrom when required.
The inner surface of this annular portion of the cage is preferably less taper
than that of the outer surface. The neck of the casing is tapered to fit the outer
peripheral surface of the cage. The cover of the casing is formed with an annular

page_text: recess between its screw threaded external rim and the central boss through which
the valve-spindle works.
The inclined annular portion of the cage is thus fitted to and between the inner
surface of the neck of the casing and the outer surface of the boss or central
portion of the cover, both surfaces being properly inclined for this purpose. As
the result of this construction and arrangement of the parts, the cover, when
screwed down, will press the seat securely and truly into its place in the casing
and will at the same time force the aforesaid inclined or taper surfaces into close
contact with each other thereby ensuring sound fluid-tight joints at both parts
of the stop-valve.
The removal of the seat can be readily effected at any time by lifting or pulling
it endwise from the casing when the cover is unscrewed. In some instances we pro-
vide the upper end of the cage with a small flange or projection under which a
chisel or other suitable implement can be applied to facilitate its removal from
the casing.
According to a modification of our invention we form the taper or inclined surfaces
at the upper end of the cage as follows viz, we form on the upper surface of the recess
in the cover of the casing a V-shaped annulus or ring the apex of which projects into
an annular groove between the cage and the casing. Therefore when the cover
is screwed down upon the neck the result will be the same as that above described,
.e. the endwise pressure will ensure the tightness and soundness of the joint
between the seat and the casing at the lower end of the cage while the lateral or
radial components of such pressure will force the inclined surfaces together and
thereby make the valve fluid-tight at the cover.
Dated this 23rd day of March 1907
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.
We, JOSEPH HOPKINSON, and J. HOPKINSON & Co., LIMITED, both of Britannia
Works, 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 with removable seats that is to say, seats
formed in a part which is-separable-from-the valve body or casing and the said
invention has for its objects to ensure fluid-tight joints between the metal of the
removable part and that of the casing and to facilitate the insertion and removal
of the valve and seat when necessary. The part in which the valve-seat is formed
is a cylindrical frame or cage wherein the valve is enclosed; the upper end of this
cage has an annular surface accurately fitted in the neck of the casing immedi-
ately below the cover, and its lower end is seated on the diaphragm or part of the
casing which separates the inlet and outlet passages. The cage is so constructed
as to allow a free passage of the water or other fluid through it.
In valves provided with seats of this kind it is obviously difficult to ensure the
fluid-tight contact of the metal surfaces at the upper and lower parts of the
cylindrical frame or cage. Stop valves have been made with removable seats
which have the cage or frame secured by screw threads in the neck of the casing.
Others have had the cage provided with packing at the upper end so arranged

page_text: a ring of packing at the saru upper end.
But these and other arrangements heretofore adopted have not proved satis-
factory. We have therefore sought to accomplish the desired result by totally
different means which we will now describe by the aid of the accompanying
drawings in which
Figure 1 is a vertical longitudinal section of a stop valve.
Figure 2 is a transverse vertical section of the casing.
Figure 3 is an elevation of the cylindrical frame or cage detached.
Figure 4 is a horizontal section of the same.
Figure 5 is a longitudinal vertical section shewing a modification of our inven-
tion.
Like letters indicate the same parts throughout the drawings.
The body or casing a is constructed of any required material and dimensions
and is suitably formed to receive the cage b in the lower or inner end of which
the seat is formed as above specified. This cage at its upper or outer end is
formed with an annular portion 2 that fits the orifice of the neck a¹ of the casing a.
In some instances this orifice may be lined with vulcanite or other suitable
material.
The peculiar formation of these parts is the important feature of our invention
as will be understood from the following description that is to say:-According
to our invention we dispense with screw-threads and with packing-boxes or other
contrivances which necessitate the attachment of the cage to the casing otherwise
than by the simple contact of their surfaces. And by the employment of taper or
conical surfaces at the upper end of the cage in combination with the lower end
thereof, seated on the part 2 of the casing we avoid the difficulty usually
experienced in attempts to obtain fluid-tight joints at two different parts with
surfaces at different angles to each other.
In the form of our invention illustrated in Figure 1 the aforesaid annular
portion of the cage is made taper on its outer and inner peripheries its largest
diameter being at the top and its smallest outside diameter being somewhat larger
than the interior of the neck a¹ so that the entire cage can be readily inserted into
the casing and withdrawn therefrom when required. The interior of the neck is
made taper to receive the exterior surface of the cage as shewn.
The inner surface of this annular portion 2 of the cage is preferably tapered
at an angle less than that of the outer surface. The cover c of the casing is formed
with a central boss c through which the valve spindle works and which is made
taper to fit the inner taper surface of the annular portion 62 of the cage. The
taper annular portion of the cage is thus fitted to and between the inner taper
surface of the neck of the casing and the outer taper surface of the boss or central
portion of the cover. As the result of this construction and arrangement of the
parts, the cover c, when screwed down upon the casing will press the lower end of
the cage closely and tightly into contact with the surface on which it is seated
and will at the same time force the aforesaid conical or taper surfaces into close
contact with each other thereby ensuring sound fluid-tight joints at both ends
of the cage.
The removal of the seat can be readily effected at any time by lifting or pulling
the cage endwise from the casing when the cover c is unscrewed. To facilitate
its removal we prefer that the inner surface of the annular portion 2 of the cage
should be tapered at an angle less than that of the outer surface as above described,
as when the surfaces are so formed the cage will come out with the cover when
the latter is removed.
We provide the upper end of the cage 6 with a small flange or projection 63
under which if necessary a chisel or other suitable implement can be applied to
facilitate its removal from the casing.
In some instances the annular portion at the upper end of the cage may be

page_text: .
made taper on the outer surface only, the cover being arranged to press upon the
outer end of the said cage.
According to a modification of our invention we form the taper or inclined
surfaces at the upper end of the cage as follows viz, we form on the upper surface
of the recess in the cover of the casing a V-shaped annulus or ring d the apex of
which projects into an annular groove between the cage and the casing as shown
in Figure 5. Therefore when the cover c is screwed down upon the neck the
result will be the same as that above described i.e. the endwise pressure will
ensure the tightness and soundness of the joint between the seat and the casing at
the upper and lower ends of the cage.
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. In a stop-valve the removable seat made fluid-tight within the casing by
means of taper or conical surfaces for the purposes specified.
2. In a stop-valve the removable seat-frame or cage having at its upper end
taper or conical annular surfaces. arranged substantially as described in combina-
tion with the seating surface at the lower end of the cage so as to ensure fluid-
tight joints at both ends of the same.
3. A frame or cage such as that above described fitted in the casing and arranged
in combination with the screw-cover substantially as and for the purpose specified.
4. A stop valve having our above described improvements applied thereto sub-
stantially as set forth with reference to the accompanying drawings for the
purposes specified.
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HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.