Improvements in Globe-valves.
Year: 1892

page_text: Date of Application, 12th Dec., 1892-Accepted, 11th Mar., 1893
COMPLETE SPECIFICATION.
Improvements in Globe-valves.
1, CHARLES R. SCHMIDT, of No. 200 East 24th Street Baltimore, Maryland,
United States of America, Manager of Works, 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 has relation to globe-valves for use on steam-pipes and fittings,
and has for its object the provision of novel means for rendering the valve perfectly
steam-tight, when turned down upon its closing seat, and for preventing leakage
when the valve is raised, and caused to seat against the under side of the box, as
may be some time required when it is necessary to renew the packing in the upper
part of the box.
This invention has for its further object the provision of a novel construction and
arrangement of the valve proper, and of the collar and nut by which it is secured
upon the spindle, whereby the valve is rendered reversible, the packing-disc made
interchangeable and reversible, and the valve prevented from turning and grinding
or wearing after being seated.
My invention consists in the novel construction, combination and arrangement of
parts, as hereinafter described and specifically claimed.
In the accompanying drawings,
Figure 1 is a vertical central sectional view of a globe valve embodying my
invention.
Figure 2 is a horizontal sectional view of the same on the line X.X. of Figure 1.
The valve casing A is of the usual construction, and is provided with the box B,
through which passes the spindle D, carrying on its lower end the valve E. Above
the internally screw-threaded part of the box B, the ordinary cavity b, is formed
for the reception of packing material. A screw-threaded cap e surmounts the
box B, and is formed with a central opening for the passage of the smooth
cylindrical portion of the valve-stem. On the under-side of the box B is formed
an annular valve seat F, against which the upper side of the valve is pressed and
the valve seated, when the latter is raised to its highest point of adjustment.
The valve E, for the purposes of my invention, consists of a cylindrical block or
head, having a central opening for the passage of the spindle D, and having in its
upper and lower faces, cylindrical cavities or recesses for the reception of the
vulcanized packing discs G, G¹, which fit snugly in place, and have central openings
corresponding to the central opening in the web of the valve head. When the
valve head is in place, upon the spindle, the upper surface of the disc G, rests
against a collar h, formed upon the spindle D, and the valve is held in position by
means of a head I, formed on the lower end of the detachable section of the
spindle, the upper end of said detachable section being threaded to screw into a
socket in the base of the upper section d¹ of the spindle. It is important and very
desirable that the valve head should have a certain amount of play upon the
spindle, and that it should be able to freely rotate upon the same, so that when
the valve is seated upon its annular seat C, the valve stem may be turned inde-
pendently of the head, and the valve tightly compressed against its seat without
turning or griding upon the same. When the valve is raised as high as possible,
its upper
surface seats against the annular flange F, and produces a perfectly-steam-
tight joint, which permits of the cap e being removed, and the spindle-box packed
without danger of leakage.
It will be seen that the packing discs G, G', and the recesses in the valve in which
said packing discs fit, are exactly alike in shape and dimensions, and that under
these conditions, the valve head may be reversed on the spindle, either disc

page_text: inverted, or the discs interchanged, so that the wear upon the discs may be readily
compensated for, and their serviceableness greatly prolonged.
The valve E, as already indicated, is loose upon the stem D. Hence when the
valve is lowered upon its seat C, the upper disc G, is compressed tightly against
the collar h, thus producing a tight-joint around the collar, and preventing leakage
at that point, and when the valve is raised and seated against the annular flange F,
the lower disc G', is pressed tightly against the flanged head I, thus producing a
tight joint of the contacting-surfaces, and preventing the passage of steam from
below the valve up into the box.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is: :-
In a globe valve, a cylindrical valve head, having like cavities in its upper and
lower faces, containing like packing discs, of such form that they may be reversed
and interchanged, in combination with a valve spindle having a cylindrical portion,
which passes through the valve head, and upon which the valve head is rotatable
substantially as described.
Dated thin och 1.-
1000
CHARLES R. SCHMIDT,
By Henry Skerrett,
6, Livery Street, Birmingham, Agent for Applicant.