Improvements in Screw Valves.
Year: 1890

page_text: Date of Application, 25th June, 1890-Accepted, 26th July, 1890
ס עגע VVI
Improvements in Screw Valves.
I RICHARD STANGE of Ostraallee Dresden, Saxony, in the Empire of Germany,
Engineer, do hereby declare the nature of my said invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
The object of this invention is the manufacture of improved screw valves for high
and low pressure steam water, gas, and other fluids; such valves being easily repaired
and kept in efficient working order.
And in order that my said invention may be particularly described and ascertained
reference is hereby made to the accompanying drawings, in which similar letters of
reference indicate corresponding parts.
Fig. 1 is a sectional elevation of a screw valve, made in accordance with my
invention.
and
Fig. 2 is a section of the valve and seat.
Fig. 3 is a view of the underside of Fig. 2.
Fig. 4 is a section, showing a modified form of my invention for flat seated valves,
Fig. 5 is a view of the underside of the same.
a is the body of the valve. b is the screw spindle working in the spindle case c
and fitted with a hand wheel d. The spindle case is provided with a stuffing box for
packing, as shown at e. An external screw thread is formed at 6' on the spindle, and
a corresponding internal screw thread is formed in the spindle case. The lower end
of the spindle is turned plain at 62, and a flange b³ is formed thereon as shown. f is
the valve seat, of a conical form, made of hard metal, driven into the casting with a
fluid-tight joint, and capable of easy renewal, when worn or damaged. g is a tapered
plug, also made of hard metal, and secured to the spindle 6 by a screw collar h. k is
a casing fitting the plug g. This casing is by preference made of copper but other
suitable material may be used, according to the purpose for which the valve is
required. The casing is provided with concentric or annular ribs or sharp pro-
jections as shown, and is secured to the plug 9 by the screw m. n is a ring of
packing material, such as copper, having sharp annular edges. This ring presses
against the spindle case, when the valve is raised, and thus prevents access of pressure
to the packing above. The annular projections formed on the casing k are forcibly
pressed against the valve seat f, when the spindle is screwed down, each projection
forming in itself a fluid-tight joint. In case of damage to one or more of these
projections the remaining rings therefore secure the tightness of the valve.
In Fig. 4b is the lower end of the spindle. kis a copper face, for a flat faced
valve formed with annular projections having sharp edges as shown, the face being
secured to the spindle by the screwed ring p. This face may also be made of any
other suitable material.
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 combination with screw valves, the application and use of conical or flat valves
having concentric or annular ribs or projections formed thereon, substantially as
berein before described and illustrated by the drawings.

page_text: 2. The general construction, arrangement, and combination of the several and
respective parts, together forming my improvements in screw valves, substantially as
hereinbefore described and illustrated by the drawings.
Dated June 25th 1890.
A
GEO. DOWNING,
8, Quality Court, London, W.C., Agent for Applicant.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent for Applicant.