Improvements in Taps and Cocks.
Year: 1897

page_text: Date of Application, 18th Sept., 1897-Accepted, 20th Nov., 1897
Improvements in Taps and Cocks.
I, SAM BAMFORTH of the Glossop Iron Works, Glossop in the County of Derby,
Manager, 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:—
In the cases of taps and cocks through which corrosive liquids flow, the plugs
have been coated and the seatings and passages have been lined with lead and
lead alloys or with other metal or material which is not acted upon by the liquors.
I have found however that for certain liquors such as solutions of bisulphites, it
is sufficient if the plug alone be coated, the linings of the seatings and passages
being omitted, but I have also found that the edges of the thoroughfare through
the plug, even when made with the hardest available alloy, speedily deteriorate,
being apparently eroded by the action of the liquors and cut away by the action
of foreign matters therein. My present Invention has been designed to prevent
the result of such action or actions, and for this purpose I armour or protect the
entrance to the thoroughfare in the plug, or each entrance to the thoroughfare as
hereinafter more fully described with reference to the accompanying drawings,
in which:-
Figure 1 represents a vertical longitudinal section through a cock in which my
improvements have been embodied, and
Figure 2, an elevation of the plug only, with its passage in end view, or at
right angles to the view of the plug shewn in Figure 1.
A is the body or casing of the cock and B the plug which may have its core made
of brass or of any other suitable metal or material. Before the coating of lead or
lead alloy or other equivalent protective material is applied to the plug, I secure
upon the inlet end of the thoroughfare, or upon each end, a suitably shaped ring
such as C, consisting of a hard metal such as Phosphor Bronze. When the ring
or rings have been arranged in place, the protective coating D of lead or the like
can be applied by casting or otherwise. The plug is then turned and ground to fit
its seating in the usual way.
It will be obvious that when the tap is turned "off" the ring or rings C will not
be exposed to the action of the corrosive liquor, being then in contact with and
protected by the sides of the plug seating. Hence, since the rings are exposed
only during the short periods in which the tap or cock is "on," very little if any
local action can take place between the different metals, and since the metal
composing the rings is hard and possesses comparative indifference to the action
of the liquids, taps and cocks having their plugs constructed as described, are
found to be much more durable.
I can obtain an equivalent result by omitting the rings C and substituting
therefor a liner constructed of hard metal such as phosphor bronze, which liner
will have a shape in cross section similar to that of the rings as shewn by Figure 2
n front elevation. The liner will extend through the passage or thoroughfare of
the plug, and be arranged therein before the coating is cast thereon as herein before
descried with reference to the rings.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is
-
1. Coated plugs for taps and cocks having their passages protected by liners or
by end rings of hard metal, constructed substantially as hereinbefore described
and as illustrated by the accompanying drawings.
2. The hereinbefore described. method for strengthening and protecting the
passages of coated plugs of taps and cocks which consists in arranging therein liners
or end rings of hard metal, substantially as herein before described with reference
to the accompanying drawings.
1000