AN IMPROVED DEVICE OR APPARATUS FOR GRINDING VALVES TO THEIR SEATS
Year: 1883

page_text: LETTERS PATENT to Alexander Melville Clark of the firm of A. M and
W. Clark of 53 Chancery Lane in the County of Middlesex Fellow of the
Institute of Patent Agents for an Invention of AN IMPROVED DEVICE OR
APPARATUS FOR GRINDING VALVES TO THEIR SEATS communicated to hin
from abroad by Alfred Wells Case of South Manchester in the County of
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark
at the Office of the Commissioners of Patents on the 1st September 1883.
ALEXANDER MELVILLE CLARK, of the firm of A. M. and W. Clark of 53 Chancery
Lane, in the County of Middlesex, Fellow of the Institute of Patent Agents
IMPROVED DEVICE OR APPARATUS FOR
GRINDING VALVES TO THEIR
"AN
SEATS
"
[communicated to him from abroad by Alfred Wells Case of South Manchester in
the County of Hartford and State of Connecticut, United States of America]
The object of this Invention is to enable valves to be ground to their seats
without removing them.
The Invention consists of a rod sliding longitudinally through a stuffing box in a
screw plug opposite the face of the valve bead, having a square inner end which is
received in a corresponding recess in the face of the valve-head, and furnished with
a hand-wheel for operating the device.
The valve head is swivelled to the valve rod which passes out through a stuffing
box in a plug screwed in the valve casing and is also furnished with a hand-
wheel.
When it becomes necessary to grind the valve bead to its seat the rod is pushed
inward until the square end of the rod engages with the recess of the valve head,
so that the latter can be ground to its seat by turning the rod.
When not required for use the rod is drawn outward, so as to be out of the way
leaving the valve free to be operated in the ordinary manner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Alexander Melville Clark in the Patent Office on the 1st March
1884.
ALEXANDER MELVILLE CLARK of the firm of A. M. and W. Clark of 53 Chancery
Lane in the County of Middlesex Fellow of the Institute of Patent Agents
"AN IMPROVED DEVICE OR APPARATUS FOR GRINDING VALVES TO THEIR SEATS
A communication to me from abroad by Alfred Wells Case of South Manchester
in the County of Hartford and State of Connecticut, United States of America.
The object of this invention is to enable valves to be ground to their seats
without removing them.
The invention consists in a valve head constructed with a square recess in its
face to receive the square end of a rod sliding longitudinally through a stuffing
box in a screw plug opposite the face of the valve head as will be hereinafter fully
described.
In the accompanying drawings forming a part of this specification in which
similar letters of reference indicate corresponding parts in all the figures, Figure 1
is a sectional side elevation of the improvement, shown as applied to a valve,
Figure 2 is an elevation of the valve turned one quarter around, and having the
grinding attachment removed; Figure 3 is a sectional side elevation of the valve
head, Figure 4 is a sectional plan view of the same, taken through the line xx
figure 3.
A represents the valve stock in the diaphragm B of which is formed an opening
for the passage of the fluid, and in which is formed the seat C for the valve
head D. To the valve head D is swivelled the end of the valve rod E which
passes out through a stuffing box F in the plug G, screwed into an opening in the
stock A.
In the face of the valve head D is formed a square recess H to receive the square
end of a rod I, which passes through and slides in the stuffing box J in the plug K
screwed into an opening in the stock A directly opposite the valve head D. The
valve rod E and the key rod I are provided with hand wheels L M, for convenience
in operating them.
With this construction when it becomes necessary to grind the valve head to its
seat the rod I is pushed inward bringing the square end of the said rod I into the
square recess H of the valve head D so that the said valve head can be ground to
its seat by turning the rod I.
When not required for use the rod I is drawn outward, so as to be out of the
way, leaving the valve D free to be operated in the ordinary manner.
Having described the nature of the said Invention and the manner of performing
the same I declare that what I claim as the Invention to be protected by the
hereinbefore in part recited Letters Patent is:
The combination with the valve stock A and the valve head D, having square
recess H in its face, of the sliding rod I, having square inner end, the stuffing box J
and the screw plug K, substantially as herein shown and described whereby the
'said valve head can be ground to its seat without being removed from the valve
stock as set forth.
In witness whereof I the said Alexander Melville Clark have hereunto set my
hand and seal this First day of March A.D. 1884.