IMPROVEMENTS IN THE CONSTRUCTION OF CLACK-VALVES
Year: 1879

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for the Invention of
"IMPROVEMENTS IN THE CONSTRUCTION OF CLACK-VALVES." A communica-
tion from abroad by Rufus Nutting Pratt, of Hartford, Connecticut, United
States of America. Gentleman.
COMPLETE SPECIFICATION filed by the said William Robert Lake at the
Office of the Commissioners of Patents on the 11th August 1879.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN THE CONSTRUCTION OF
CLACK-VALVES." A communication from abroad by Rufus Nutting Pratt, of
Hartford, Connecticut, United States of America, Gentleman.
These improvements relate more particularly to the construction of valves to be
used as check-valves, but they are also applicable to other valves where it is
desirable to have a perfectly tight joint to prevent leakage through the valve-
seat.
The object of the said Invention is to provide for the accurate fitting of the
valve to its seat when the valve is originally constructed and to permit its being
readily refitted when it becomes worn, or when from any other cause it is not
perfectly tight.
The said Invention consists in the construction and arrangement of the several
parts as hereinafter described.
The accompanying Drawing shews a valve constructed according to this Inven-
tion.
Figure 1 is a vertical longitudinal section through the middle of the said valve
and its shell.
Figure 2 is an end view from the left of Figure 1 of the shell which contains the
valve and forms the valve-seat.
Figure 3 is a top view of the valve detached.
A is the shell which contains the valve. It is furnished with internal screw-
threads at the ends in the customary manner, as shown in the Drawing, for
connecting it with the pipes through which the water or other liquid is supposed to
[Price 4d.l

page_text: pass. In this shell is the valve-seat A¹; B is a cap which screws into a socket in
the top of the shell A. This cap is removable and closes an opening in the top of
the shell A through which the parts of the valve are inserted or removed. C is a
clapper which is hinged to a pin D passing through the shell from the outside, as
shown in Figure 2. E is a rotating disc constituting the part of the valve which
rests upon the valve seat. It has a central stem E which passes through an
opening in the clapper C wherein it fits loosely so as to turn freely and have some
play" the upper end of this stem is furnished with a screw-thread upon which is
screwed the nut F. This nut so rests upon a shoulder of the stem E as not to
prevent the "play" upon the clapper. Upon the upper end of the stem E¹ there
is a nick of the usual form for holding or turning the disc E.
"
By means of this Invention the valve when first made can be ground and perfectly
fitted after the parts are all in place; by. rotating the disc E a tight joint is thus
ensured when the valve is closed. Moreover when the valve becomes so worn as to
leak the cap B can be removed and the valve reground by introducing a proper
tool through the opening without removing any of the parts of the valve from
the shell. It is obvious that the said improved valve can be arranged in any
desired manner in the shell A. It may be placed either vertically or horizontally,
or it can be in line with the inlet and outlet; in this case the tool for refitting or
grinding the valve would be introduced through one of the usual openings by
which the shell A communicates with the pipes. There is an advantage however
in arranging it as shown in the Drawing, as the shell does not require to be
removed from the pipe to repair the valve.
.
Having thus fully described the said Invention as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it under-
stood that I claim,-
The combination of the rotating disc E with the hinged clapper C, substantially
as described and for the purpose specified.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Eleventh day of August, in the year of our Lord
One thousand eight hundred and seventy-nine.
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117M DADT TART
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