Improvements in Stop Valves.
Year: 1893

page_text: Date of Application, 11th Dec., 1893-Accepted, 3rd Feb., 1894
COMPLETE SPECIFICATION.
Improvements in Stop Valves.
JOHN NICHOLAS MURPHY, Plumber, and PATRICK FRANCIS MURPHY
Superintendent of Coal Mine, both of the City of Springfield County of Sangamon
and State of Illinois, United States of America, 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 is primarily intended to be applied to steam pipes, but may
obviously be used on water pipes, or pipes for conveying other liquids or gasses
without departing from my invention.
The purpose of my invention is to provide a valve so constructed as to dispense
with the packing which is a serious objection to valves as heretofore commonly
constructed. The valve is provided with discs of yielding material resting on
raised seats, as hereinafter shown, described and claimed.
On the drawing the figure is a vertical longitudinal section through the valve as
preferably constructed.
:
Similar letters indicate similar parts in the drawing.
The body A of the valve is provided on its underside with an opening into
which the inlet pipe B screws, and at one end is provided with an opening into
which the outlet pipe C screws. Within the chamber of the part A is a raised
valve-seat a. The valve top D has its lower end threaded and screws into an
opening in the top of the body A. Within the chamber of the part A is a circular
cap E, recessed on its underside. This cap is provided with an integral stem e and
an integral screw e 1.
A disk F. of yielding material, preferably of hard rubber, surrounds the screw e 1
and fits in the recess in the cap E. A conical washer G is held in place and
pressed against the disk F, by means of a nut e 2 on the screw e 1. By turning
the nut e2 the washer G may be forced up so as to compress the disk F and cause
it to completely fill the recess in the cap E. In like manner the nut M serves to
expand the disk L. The conical surface of the washer G serves to center and
guide the movement of the cap E, so that when the cap is down the disk F may
rest in proper position on the seat a. The stem e is threaded internally to receive
the screw on stem H. In the lower end of the part D is a dome shaped cavity d
and in the sides of this cavity are channels d 1 in which the guide bars e 3, integral
with the stem e work. A hole e 4 in the cap E is adapted to receive a pin or other
suitable instrument by means of which the disk F may be removed from the cap E,
and a similar hole k in the cap K likewise facilitates the removal of the disk L.
In the part D above the dome-shaped cavity d is a cylindrical cavity I. A
web J separates the cavities d and I. This web has an integral annular ledge j
which serves as a seat for the cap above it.
The recessed cap K is integral with the stem H and a disk L fits in the recess in
the cap. That part of the stem below the cap K is reduced in size and threaded
to accommodate a nut M by which the disk L is held in place and tightened as may
be necessary.
Above the cap K is a circular plate N having an integral annular ledge n which
bears on top of the cap K. On the sides of this plate are projecting lugs n 1
which work in channels d 1 in the sides of the cavity
This plate is of practical advantage in preventing the screw cap from being
unscrewed when the stem is turned backward, for no matter how hard the plate N
may press against the recessed cap the lugs on the plate prevent the plate from
turning and when the stem is turned the recessed cap cannot move the screw cap
because the plate is between them.
By means of the construction described I am enabled to readily remove the

page_text: upper cap and insert a new disk or make other necessary repairs therein without
disturbing the lower valve; all that is necessary is to unscrew the cap O, and the
stem H may be unscrewed from the stem e and the stem H and connected parts
may then be lifted out through the upper cavity I.
The upper end of cavity I is threaded internally to accommodate the adjustable
screw cap O. In the underside of the cap O is an oil reservoir o to which oil is
supplied through the hole o 1.
To the upper end of the stem H a hand wheel is secured by means of which the
valve is operated in an obvious manner.
The opening in the upper end of the part A is large enough to permit the
cap E and connected parts to be lifted out through the opening when the part D
is detached.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be carried into effect, we declare that
what we claim is :-
:-
1. In a valve, the combination of the body of the valve, the raised valve seat
within said body, the top removably connected with the body, the cap and the
stem within the body, the disk in said cap, the screw integral with said cap and
stem, the conical washer retaining the disk in place and adapted to guide the valve
into position on the seat, the nut for adjusting said washer, the upper stem
screwing into the lower stein, the hand wheel secured to said upper stem the dome
shaped cavity in the lower end of the removable top part, the channels in the sides
of the said dome shaped cavity, the guides on the lower stem adapted to move in
said channels, the cylindrical cavity above the dome shaped cavity, the web
between said cavities, the annular raised seat on the upper side of said web, the
reduced screw part of the upper stem having a nut working on said screw,
recessed cap integral with the upper stem, the disk fitting in the recessed cap,
the circular plate above said cap having lugs and provided with an annular ledge'
bearing on the cap, the channels in which said lugs move, the screw cap above
said plate and the oil chamber in said screw cap, as set forth and for the purpose
stated.
the
2. In a valve baving caps provided with disks, the combination with the body of
the valve, the raised seat within said body, the cap within said body connected
with the valve stem and adapted to rest on said seat, the top part detachably
connected with the body, the cavity in the upper end of said top part, the stem
passing through said top part and connected with the cap in the body the means
for turning said stems, the raised seat within said cavity and the recessed cap
adapted to rest on top of said seat, the plate within said cavity having lugs moving
in channels in said cavity and a screw cap fitting in said cavity and provided with
an oil reservoir and oil hole, as set forth and for the purpose stated.
3. In a valve having caps provided with disks, the means adapting the upper
cap to be removed without disturbing the lower valve, consisting of a top part
connected with the body, said top being provided with a cavity having channels in
its sides, a stem extending through said cavity and connecting with the stem of
the lower valve in the body, a recessed cap on said stem, a plate above said cap
having lugs moving in a channels in said cavity and a screw cap screwing into said
cavity above said plate, as set forth.
4. In a valve the combination of the casing or body, the stem therein, and the
recessed caps carried by the stem and having the hole therein to permit the
insertion of an instrument for forcing out the disks in the caps.
Dated this 11th day of December 1902
JOHN P. O'DONNELL,
Per W. H. C.,
70 & 71, Palace Chambers, Westminster, S. W.,
Agent for the said Applicants.