Year: 1886

page_text: Date of Application, 15th Dec., 1886.
Specification Accepted, 1st. Feb., 1887.
I, JOHN MILLER of the firm of Smith Brothers and Company of Hyson Green in
the Town and County of Nottingham 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 :—
This invention relates to that class of stop cock or valve in which a cylindrical or
slightly taper plug is employed which plug is made to rise bodily out of its shell or
seat by means of a screw spindle into a chamber formed in the valve casing thus
giving a straight clear full way or passage and my improvements consist in forming a
tight joint between the valve and its shell or seat by means of soft substances such as
fibrous or manufactured asbestos, hemp, jute, india-rubber or any compound of the
same substances the manner in which this is effected being illustrated by the
accompanying drawings.
Figure 1 is an elevation of the valve and casing the latter being in section,
Figure 2 is a sectional elevation of the valve or plug only, Figure a sectional plan
thereof and Figure 4 an elevation of casing with lever apparatus for raising and
lowering valve.
A is the casing, the inlet and outlet ports A¹ of which are formed opposite each
other. B is a chamber forming part of the casing, for the reception of the cylindrical
plug C which is threaded internally for the reception of a screwed spindle D by which
it is opened or closed. Parallel to the axis of the plug C are formed grooves C¹
extending the whole length thereof. In boring these grooves or recesses a portion of
the outer metal is cut away the width of the opening thus formed being less than the
diameter of the groove whereby a circular dovetailed groove is formed for the reception
of packing. At each end of the plug is placed a washer E each washer having
surface projections e corresponding with and fitting into the grooves C¹ formed in the
plug. After the grooves have been filled with packing material of the kind herein-
before mentioned the washers are placed in position and forced down upon the packing
by means of glands F screwed into the ends of the plug the internal passage of which
is enlarged or countersunk for the purpose so as to allow for the passage of the
spindle D. The pressure exerted by the projections e upon the packing causes it to

page_text: expand in diameter, thus forcing the portions opposite the longitudinal openings so
that when the plug is screwed into its seat those expanded portions are in contact with
the metal sides of the shell, the dovetail form of the groove preventing the packing
from becoming displaced or forced out of the groove which might otherwise occur
especially if the plug were taper.
By the use of my invention the plug when cylindrical may fit easily within the
shell the packing being sufficient to prevent the passage of water or other fluid or
vapour whereby the friction in opening and closing the valve and the wear consequent
thereon will be greatly reduced.
To prevent the plug from turning round whilst being opened or closed lateral
projections G are formed on the top of the plug which fit into corresponding grooves
or recesses G¹ in the shell of the barrel B. If however it is desired to impart a slow
rotary motion to the plug the grooves may assume the form of a slow screw or helix.
The plug may be raised and lowered by means of a lever J pivoted at J to a
rocking arm K and connected at J' to the plug spindle D, thus giving an instantaneous
opening or closing of the valve.
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. In a valve such as herein described the grooves C¹ formed in the plug C for the
purpose of containing packing substantially as specified and illustrated in the
accompanying drawings.
2. In a valve such as herein described the combination with the plug such as C
having grooves or recesses C¹ of glands F and washers such as H having projections e
for compressing the packing substantially as specified and illustrated in the accom-
panying drawings.