Improvements in Stop Cocks or Valves.
Year: 1891

page_text: Date of Application, 19th Feb., 1891-Accepted, 28th Mar., 1891
COMPLETE SPECIFICATION.
Improvements in Stop Cocks or Valves.
We, WILLIAM HITCHCOCK SPENCER and JOHN MILLER RALSTON, both of
Hitchin, in the County of Herts, Engineers, 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 for improvements in stop cocks or valves relates to full way stop
valves of the sluice or sliding type & has for its object to construct a stop valve in
such a manner that while the fluid is allowed to pass through with little or no
obstruction when the valve is open, the said valve will be firmly pressed or jammed
on its seats when closed and can be readily and easily opened; and consists in
forming the valve of two separate discs which are pressed outward against their
faces or seats when the passage is being closed as the valve approaches the end of
its travel; by means of two links which are attached to a sliding sleeve in such
a manner that when the sleeve is caught by a nut or stopper on the actuating
screw the links are moved into position so as to press the valves against their
faces.
In the accompanying two sheets of drawings
Fig. 1. is a vertical section through the passages of a full way stop valve con--
structed according to our invention, shewing the links moved to the position to press
the valves against their faces.
Fig. 2. is a horizontal section of the same shewing the valves relieved of the link
pressure and standing open.
Fig. 3. is a similar view but shewing the valves closed with the links pressing the
valves against their seats.
An outer casing or box a with through passages and flanges c is fitted with
faces or seats on which two valves e slide for the purpose of closing the passages b.
On the backs of the valves are two projections which fit into suitable apertures in
a hollow screw box g which is raised and lowered at pleasure by means of the
actuating screw h. Fitted between said projections fand fixed to them by a pin
in such a manner that they can move the valves outwards and inwards, are links i
which are also attached to a sleeve k. At the bottom end of screw h is a collar or
stopper which is attached to by means of a screw thread and so can be adjusted
as desired.
On the sides of the outer casing a are grooves or channels m
parallel with
the actuating screw and for the purpose of guiding the valves into position.
The actuating screw h engages with the screw box g at n and passes through the
sleeve k, its upper end passing through a stuffing box o and gland p in the cover
secured by the bolts to the casing a and being surmounted by the hand wheel
as clearly shewn. Motion of the screw in the direction of its length is prevented
by the collar which bears on its upper side on gland u and on its under side
against the cover.
As the valve approaches the end of its travel the sleeve at a certain point is
prevented from descending further by the nut or stopper while the screw box g is
forced downwards by the screw and carrying the valves e and links with
it causes the links to press the valves against their faces and closes the passage.
By means of the nut the valves can be adjusted to shut at any desired point.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is
1. In a full way stop valve, automatically pressing the valves upon their seats

page_text: when the passages are closed by means of links attached to a sleeve the said links
being also attached to the valves and the links having a limited rotary motion
are forced outwards by means of the screw forcing the box which carries the
links and valves downwards and thus pressing the valves outwards on to their
seats.
2. In combination with the links an adjustable nut or stopper is screwed on to
the end of the actuating screw for the purpose of stopping the sleeve so that
the links can be made to press against the valves and close them at any desired
point.
3. The arrangement and construction of full way stop valves substantially as
described with reference to the drawings.
1
WM. HITCHCOCK SPENCER.
JOHN M. RALSTON.