Improvements in "Screw Down" Valves for Water and other Liquids, Steam, and Gases.
Year: 1894

page_text: Date of Application, 23rd Jan., 1894
Complete Specification Left, 23rd Oct., 1894-Accepted, 22nd Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in "Screw Down" Valves for Water and other
Liquids, Steam, and Gases.
I SAMUEL JAMES BARFORD 2 Lenham Terrace Crayford Kent Sanitary
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates especially to the use of metal for both the valve & its seat,
& means for maintaining the truth & tightness of the surfaces involved, to which
end the valve is caused to revolve against its seating while in forcible contact
therewith both on opening & closing. To obtain this action, the main screwed
spindle works in a thread cut on the inner surface of a cylindrical bush fitting
accurately in the upper part of valve body or shell. This bush, while free to
move axially, is prevented from rotating by a pin or feather inserted between itself
& the shell or body. The opening in upper part of body or shell is closed by a
screw cap or stuffing box of the usual description, which besides serving to guide
the main spindle also keeps in place a strong helical spring, whose lower extremity
bears on the before mentioned bush, which it tends to keep in its lowest position,
this position being determined by a projection, or collar on top of bush, coming in
contact with upper surface of valve body.
The lower end of main spindle is finished off true & flat, hemispherical, conical,
or other shape, & itself forms the valve closing the way, or a seperate self-
adjustable piece or "jumper" may be used for the purpose, which "jumper" instead
of being of metal may be formed of glass, earthenware, ebonite, celluloid, or other
suitable material.
Instead of arranging the helical spring as described, it may be placed in a
hollow cylinder the lower end of which is closed, the under surface of which
lower end, which may be seperate, & of material other than metal, forms the
valve.
The open end of this cylinder is entered by the lower end of main spindle & is
attached thereto through the medium of the helical spring which, while permitting
a small vertical movement, supplies an elastic connection for the purpose of
rotation.
Signed this 23rd day of January 1894.
Improvements in "Screw Down" Valves for Water and other
Liquids, Steam, and Gases.
I, SAMUEL James Barford 2 Lenham Terrace Crayford Kent Sanitary
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 :―
My invention relates especially to the use of metal for both the valve & its
seating & to the means employed to maintain the truth & tightness of the respective

page_text: In carrying out my invention, I form the female thread, through which the
main screwed spindle works, on the interior surface of a cylindrical, or, other
shaped, bush fitting accurately in upper part of body or shell of valve.
This bush while free to move axially is prevented from rotating by two or more
fingers or lugs projecting upward from the upper surface of valve body, & engaging
with corresponding notches formed in the edge of a collar or shoulder constituting
the upper extremity, & limiting the downward travel of, said bush.
The bush may also be prevented from rotating by inserting a pin or feather
between the outer surface of said bush, & inner surface of valve body.
The upper & open portion of shell or body of valve, is closed by a screw cap or
stuffing box of the usual description, which besides serving to guide the main
spindle, also keeps in place a strong helical spring whose lower extremity bears
on the before mentioned bush which it tends to keep in its lowest position.
The lower end of main screwed spindle is finished off flat, hemispherical, conical
or other suitable shape & itself forms the valve closing the way.
Instead of using the main spindle itself for the valve, a separate valve or jumper
may be employed, which jumper may consist, or be composed of, glass, earthenware,
ebonite, celluloid, or other suitable material.
Instead of arranging the helical spring as described, it may be placed in a hollow
cylinder, the lower end of which is closed, the under surface of which lower end,
(which may be of any suitable shape or material as well as metal, or may be
separate from said cylinder), forms the valve.
The open end of this cylinder is entered by the lower end of main spindle, & is
attached thereto through the medium of the helical spring which, in addition to
permitting a small vertical movement, supplies an elastic connection for the purpose
of rotation.
In the drawings A is the main screwed spindle working through movable bush B
whose upper extremity is formed into a collar or shoulder having two or more
notches G formed in its circumference. These notches engage with corresponding
projections or fingers F extending upward from the upper part of valve shell &
serve to prevent rotation of movable bush when main spindle is operated. C is
the helical spring contained in a chamber or recess of the screw cap stuffing box D
& bearing against the upper portion of the movable bush, which consequently has a
constant downward tendency, with the result of causing the lower end of spindle
to revolve in forcible contact with valve seating, both on opening & closing
valve. E is the upper portion of valve body or shell in which the movable
bush fits.
Having now particularly described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed, I declare that what I
claim is
A screw down valve or cock having a movable cylindrical or other shaped, bush
controlled by a helical spring for the purposes herein stated substantially as
described.
Dated this 23rd day of October 1904