Improvements in or connected with Stop Valves.
Year: 1890

page_text: Date of Application, 23rd July, 1890-Accepted, 23rd Aug., 1890
COMPLETE SPECIFICATION.
Improvements in or connected with Stop Valves.
We, WILLIAM FRANCIS BRIGGS of No. 2, Cross Street, Engineer, and WILLIAM
THOMAS WEST, of No. 56, Portland Street, Publican, both in the City and County of
Lincoln, 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 said invention relates to improvements in or connected with stop valves for
water and other fluids and has for its object to prevent the passage of the fluid past
the screw spindle into the stuffing box and thus to enable the spindle to be packed
more readily than heretofore and in some cases the packing to be entirely dispensed
with.
In stop valves as heretofore constructed, it was difficult to obtain a tight joint
between the screw spindle and its bearing in the cover of the valve box and it was
only by screwing the valve down to its extreme position to force a flange upon the
spindle against a seat that the flow of water past the spindle into the stuffing box
could be controlled and thus the spindle could be packed only in one position of
the valve.
Now, according to our invention we are enabled to pack the stuffing box whilst
the valve is in any position, and indeed the joint between the spindle and its
bearing in the cover of the valve box is so perfect that we can, if desired, entirely
dispense with packing.
:
For this purpose, we form upon the screw spindle of the valve a conical or
tapered boss or plug which closely fits a corresponding seat formed in the cover of
the valve box and we keep the conical boss or plug up to its seat by means of an
adjustable ring or washer formed with holes therethrough to receive set screws
which screw into holes in the cover of the valve box and thus a tight joint is at all
times maintained between the parts.
And in order that the said invention may be more clearly understood and readily
carried into effect, we will proceed, aided by the accompanying drawings, more
fully to describe the conse
Figure 1. is a vertical transverse section of a valve box cover and stuffing box
together with the screw spindle constructed according to our invention, and
Figure 2. is an underside view thereof, with the lower part of the screw spindle
broken away.
a. represents the cover of the valve box, a¹ represents the stuffing box, and a repre-
sents the gland.
b. represents the screw spindle which, in its revolution, raises and lowers the nut d.
to which the valve (not shown) is attached, as is well understood.
Upon the screw spindle b, above the threaded part thereof, we form a conical or
tapered boss or plug which closely fits a corresponding seat formed of a lining
of brass or other suitable material a fitted into a recess a formed in the cover a. of
the valve box.
Beneath the recess a is a recess a³ of larger diameter into which we fit a ring
washer or plate c. which is formed with a hole c¹ therethrough to receive the
spindle 6 and takes a bearing against the underside of the conical plug or boss b'.
The ring washer or plate c. is perforated to allow of the passage of set screws c
which screw into tapped holes a formed in the cover a. of the valve box and by
Pic 21

page_text: these means the boss or plug b¹ may be forced up to its seat with any desired
pressure and a tight joint thus maintained at all times between the parts.
By this arrangement of parts, we are enabled to pack the stuffing box a' whilst
the valve is in any position as the joint between the boss or plug b¹ of the
spindle b. and its seat as is so perfect that under heavy pressures no fluid will
pass that point and may therefore dispense entirely with packing in the stuffing
box a¹.
In order however to provide against any slight leakage past the plug &¹ during
the packing operation in cases where the device is used under very heavy pressure
we provide a small by-pass a' immediately above the plug in order to carry off
such leakage and prevent it entering the packing box a¹ and we normally close such
by-pass a by means of a screw plug a³.
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 combination of a spindle 6 formed with a conical plug 61
thereon, a corresponding seat a formed in the cover a. of the valve box and an
adjustable ring plate or washer c. or its equivalent for keeping the plug up to its
seat, substantially as herein shown and described, and for the purpose stated.
2. In a stop valve, the combination of a spindle b. formed with a cenical plug b¹
thereon, a corresponding seat a formed in the cover a. of the valve box, an
adjustable ring plate or washer c. or its equivalent for keeping the plug up to its
seat and a by-pass a substantially as herein shown and described, and for the
purpose stated.
Dated this 23rd dow of July 1800
VAUGHAN & SON,
Agents for the Applicants.