IMPROVE- MENTS IN STOP-VALVES FOR CORROSIVE FLUIDS."
Year: 1880

page_text: LETTERS PATENT to Arthur Hamilton Cochrane, of No. 62, Princes Square,
Bayswater, in the County of Middlesex, for an Invention of " IMPROVE-
MENTS IN STOP-VALVES FOR CORROSIVE FLUIDS."
PROVISIONAL SPECIFICATION left by the said Arthur Hamilton Cochrane
at the Office of the Commissioners of Patents on the 28th August 1880.
ARTHUR HAMILTON COCHRANE, of No. 62, Princes Square, Bayswater, in the
County of Middlesex. "IMPROVEMENTS IN STOP VALVES FOR CORROSIVE FLUIDS."
My Invention relates to a construction of stop valve for regulating or arresting
the flow of a corrosive fluid, such as sulphuric acid, which acts energetically on iron,
brass, or copper, but which acts feebly on such materials as lead and caoutchouc.
The valve box is of the T form usually employed for stop valves, having two
branch pipes, which may be at right angles to each other, and a cover opposite one
of them. It is mado entirely of lead with flanges, by which its branches can be
bolted to those of the pipes leading to and from it. On the aperture opposite the
cover a caoutchouc ball can seat itself as a valve, and can be pressed firmly down to
its seat by a leaden rod, which passes through a caoutchouc ring packing in the cover
of the valve box. This leaden rod, which is made with a broad end to press on
the caoutchouc ball, is hollow, forming a casing for a gun metal rod which is screwed
through a bracket or yoke fixed on the cover of the valve box, and can be turned
by a handle. The bracket or yoke through which the gun metal screw works
projects so far above the valve box cover that the screwed part of the rod, when
it is in its lowest position, pressing the caoutchouc ball firmly on its seat, does
not enter the packed hole in the cover, above which a portion of the leaden casing
of the rod still projects. Thus, the corrosive fluid is in no part of the valve allowed
to come in contact with any material other than the lead and the caoutchouc,
whilst the metallic parts protected from the fluid are of material sufficiently strong
to operate the valve. The ball valve, instead of caoutchouc, may be of glass or
ceramic ware, and the valve box itself may in many cases be made of glass or
ceramic material. For the valve box and rod I have mentioned lead as being suitable
when sulphuric acid is dealt with. For some other acids, such as hydrochloric acid,
tin is employed instead of lead, the metal or material which is exposed to the
corrosive liquid being in all cases chosen of a kind that is most feebly acted on by
tho particular liquid for which the valve is employed.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Arthur Hamilton Cochrane in the Great Seal Patent Office on the
26th February 1881.
ARTHUR HAMILTON COCHRANE, of No. 62, Prince's Square, Bayswater, in the
County of Middlesex. "IMPROVEMENTS IN STOP VALVES FOR CORROSIVE FLUIDS."
My Invention relates to a construction of stop valve for regulating or arresting
the flow of a corrosive fluid such as sulphuric acid, which acts energetically on iron,
brass, or copper, but which acts feebly on such materials as lead and caoutchouc.
The valve box is of the T form usually employed for stop valves, having two
branch pipes, which may be at right angles to each other, and a cover opposite one
of them. It is made entirely of lead with flanges, by which its branches can be
bolted to those of the pipes leading to and from it. On the aperture opposite the
cover a caoutchouc ball can seat itself as a valve, and can be pressed firmly down
to its seat by a leaden rod which passes through a caoutchouc ring packing in the
cover of the valve box. This leaden rod, which is made with a broad end to press
on the caoutchouc ball, is hollow, forming a casing for a gun metal rod, which is
screwed through a bracket or yoke fixed on the cover of the valve box, and can be
turned by a handle. The bracket or yoke through which the gun metal screw works
projects so far above the valve box cover that the screwed part of the rod, when it
is in its lowest position, pressing the caoutchouc ball firmly on its seat, does not
enter the packed hole in the cover, above which a portion of the leaden casing of
the rod still projects. Thus, the corrosive fluid is in no part of the valve allowed
to come in contact with any material other than the lead and the caoutchouc, whilst
the metallic parts protected from the fluid are of material sufficiently strong to
operate the valve. The ball valve, instead of caoutchouc, may be of glass or
ceramic ware, and the valve box itself may in many cases be made of glass or
ceramic material. For the valve box and rod I have mentioned lead as being suitable
when sulphuric acid is dealt with. For some other acids, such as hydrochloric acid,
tin is employed instead of lead, the metal or material which is exposed to the
corrosive liquid being in all cases chosen of a kind that is most feebly acted on by
the particular liquid for which the valve is employed.
The accompanying Drawing represents a vertical section of a stop valve according
to my Invention, suitable for arresting or regulating the flow of sulphuric acid.
A, A, is the shell of the valve box, and B, B, is its cover; the material employed
in this case both for the shell and cover being lead. C, C, is the bracket or yoke,
which may be of cast iron, and D, D, are iron washers or plates placed under the
heads of the bolts E, which serve at the same time to secure the cover and the yoke,
the strain of the bolts being spread by the base of the yoke and by the plates D
over a large surface of the soft material constituting the valve box and its cover.
F is the ball valve, which may be of caoutchouc, glass, or ceramic material; G, G, is
the valve rod screwed along its upper part to fit a thread formed in the yoke O, and
widened out at its base G¹. This screwed stem may be of gun metal or bronze; it
is cased over by a leaden covering H, H, extending over all the part of the stem
which comes within the valve box, and a little above the cover. K is a cupped
caoutchouc packing to prevent leakage past the stem, and L is a caoutchouc ring
which, when the stem is fully screwed up, is seated as a valve against the aperture
through the cover. The stem is turned by a handle M in one direction to close
the valve, and in the other direction to permit of its opening partially or entirely.
Having thus described the nature of my Invention and in what manner the
same is to be performed, I claim,—
Constructing stop valves for corrosivo fluids, with all the parts exposed to the

page_text: fluid made of, or covered by lead or other material, on which the fluid acts feebly
or not at all, as herein described with reference to the accompanying Drawing.
In witness whereof, I, the said Arthur Hamilton Cochrane, have hereunto
set my hand and seal, this Twenty second day of February, in the year
of our Lord One thousand eight hundred and eighty one.
ARTHUR HAMILTON COCHRANE. (L.s.)