An Improved Cock for Steam or Fluids Under Pressure.
Year: 1889

page_text: Date of Application, 15th Jan., 1889
Complete Specification Left, 23rd Sept., 1889-Accepted, 2nd Nov., 1889
PROVISIONAL SPECIFICATION.
An Improved Cock for Steam or Fluids Under Pressure.
I, HENRY BRECKNELL, of Lawrence Hill, Bristol, in the County of Gloucester
Engineer do hereby declare the nature of this invention to be as follows:-
My Invention relates to cocks for the retention and also the regulation of the
flow of steam or liquids under pressure, and has for its object the maintenance of
the original steam or fluid-tight condition of the plug within the conical chamber
provided in said cock for the purpose of operating and regulating the passsage of
steam or fluids through the same.
In carrying my Invention into effect, I provide within said conical chamber, two
or more elliptical or rectangular recesses or grooves which are filled with asbestos,
or other material of a like nature.
The taper, or conical plug is formed in such a manner as to allow of the regulating
inovement to he applied at the extremity of the conc-where the least diameter
obtains. A scrow gland, through which the squared end of said plug protrudes,
enables a circular packing of asbestos or the like to be compressed around said plug,
and prevent the leakage of steam or liquid, which, in cocks for this purpose as
hitherto constructed, is objectionable, and liable to scald or injure the hand when
opening or closing said cock.
At the lower, and larger diameter of said conical plug I arrange a hardened steel
contre, fitted within a screw cap, the adjustmont of which upon the lower part of the
conical chamber in the body of the cock, presses the conical plug into said chamber
so as to preserve a steam and fluid tight contact between the two surfaces, of the
plug and chamber respectively. In order to keep the plug concentric to the bore
of the chamber, 1 form a suitable recess, or female centre to coincide with the steel
centre above mentioned. The elliptical or rectangular grooves, filled with asbestos,
herein before referred to, are formed in the body of the cock upon the inner and
working surface of the conical chamber, between the ports or ways, and the expansion
of said asbestos or other packing within these grooves by the absorption of moisture,
materially assists to maintain the steam and fluid-tight condition of the cock when
in use, and reduces the actual working surface of the plug.
Dated this 14th day of January 1889.
FREDK. WALKER & HYDE,
4, Little Moorfields, London, E.C., Agents for Applicant.
COMPLETE SPECIFICATION.
An Improved Cock for Steam or Fluids Under Pressure.'
I, HENRY BRECKNELL of Lawrence Hill Bristol, in the county of Gloucester,
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 :-
My invention relates to cocks for the retention, and also the regulation of the
flow of steam, liquids or gases under pressure, and has for its object the maintenance
of the original steam, fluid or gas-tight condition of the plug within the conical
chamber provided in the body of said cock for the purpose of operating and regulating
the passage of steam or the like through the same.
In order that my invention may be clearly understood, I have appended hereto
the accompanying sheet of drawings, in which Figure 1 represents a sectional
elevation of the improved cock, and Figure 2 an end elevation thereof. Figure 3
is a section of the body thereof upon the line A B Figure 1, and Figure 4 is a viow

page_text: of a detail hereinafter to be described, shewn detached. Similar letters of reference
indicate corresponding parts throughout the several views.
In carrying my invention into effect, I provide a body A, with conical bore B, to
suit the conical plug C. Within the bore above referred to, 1 provide two or more
elliptical or rectangular grooves a, filled in with asbestos, or other material of a like
nature. The taper or conical plug C is formed in such a manner as to allow the
opening, closing or regulating movement to be applied at the extremity D of the plug,
where the diameter is smallest. A screw gland E with sliding bush F enables a
circular packing of asbestos or the like G to be compressed around said plug and
prevent the leakage of steam, liquid or gas, which, in cocks used for this purpose as
hitherto constructed, is objectionable, and liable to scald or injure the hand when
opening, closing or regulating.
At the lower end and larger diameter of the plug C, I form a conical recoss, for
the reception of the point of a steel centre H, preferably hardoned. Said centro His
screwed into a cap or cover I, the adjustment of which presses the plug C into the
bore B so as to preserve a steam, gas, or fluid tight joint between the surfaces of the
plug C and the chamber B respectively, and the centre H also preserves said plug C
in a concentric position within the bore B aforesaid.
It will be seen that the chief feature of my invention is the elliptical or rectangular
groove or grooves, a filled with asbestos, and formed upon the inner surface of the
bore B, shewn more particularly by Figure 3. Said groove or grooves completely
isolates the ports or ways J, and the expansion of said asbestos or other packing by
the absorption of moisture, materially assists to maintain and preserve the fluid-
tight condition of the cock, and also reduces the actual working and wearing surface
of the plug.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1
claim is,
First. The improved cock substantially as herein described and shewn in the
accompanying sheet of drawings.
Second. In a cock for the retention or regulation of steam, gas, or liquid, the
employment of elliptical or rectangular grooves, a filled with asbestos or other suitable
packing, substantially as and for the purposes herein described with reference to the
accompanying drawings.
Third. In a cock, as referred to in the preceding claims, the employment of a
centre H, substantially as and for the purposes herein set forth, and shewn in the
accompanying drawings.
Dated this 12th of September 1889.
FREDK. WALKER & HYDE,
4, Little Moorfields, London, E.C., Agents for the Applicant.