Improvements in or connected with Valves.
Year: 1891

page_text: Date of Application, 28th Aug., 1891
Complete Specification Left, 4th Feb., 1892-Accepted, 19th Mar 1892
PROVISIONAL SPECIFICATION.
Improvements in or connected with Valves.
I, FRANK WALTER SCOTT Junior, of the firm of George Scott and Son, of
44, Christian Street, Commercial Road, in the County of London, Engineers, do
hereby declare the nature of this invention to be as follows:-
My invention relates to what are known as mitred working valves, for use in
connection with cranes, lifts, presses and other machinery operated by hydraulic,
compressed air or other fluid pressure, the object of the invention being to simplify
the construction of such valves and to render them less liable to leakage.
According to my invention, instead of operating the valves from the exterior of
the valve casing through the medium of rods passing through stuffing boxes, I
operate the same by means of a cam or lever placed within the valve casing and
operated from the exterior thereof through the medium of a suitable spindle, the
said cam or lever being arranged in connection with the inlet and exhaust valves in
such a manner that when one is open the other is closed.
Dated the 28th day of August 1891.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Valves.
I, FRANK WALTER SCOTT Junior, of the firm of George Scott and Son, of
44, Christian Street, Commercial Rond, in the County of London, 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 :-
My invention relates to what are known as mitred working valves for use
in connection with cranes, lifts, presses and other machinery operated by hydraulic,
compressed air or other fluid pressure, the object of tho invention being to simplify
the construction of such valves and to render them less liable to leakage.
According to my invention, instead of operating the valves from the exterior of
the valve casing through the medium. of rods passing through stuffing-boxes, I
operate the same by means of a cam or lever placed within the valve casing and
operated from the exterior thereof through the medium of a suitable spindle, the
said cam or lever being arranged in connection with the inlet and exhaust valves in
such a manner that when one is open the other is closed.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which :-
Figure 1 is a vertical section of a working valve constructed according to my
invention; and,
Figure 2 is a sectional view looking in the direction of the arrow Figure 1:
Figure 3 is a view illustrating a slight modification :
Figure 4 is a view similar to Figure 1 but shewing the mitred valves arranged
to work horizontally instead of vertically:
j
Figure 5 is a plan view of the working valve shewn in Figure 4.
Similar letters of reference indicate corresponding parts in the several figures.
a indicate the valve casing, 6 the inlet for the water or other fluid under pressure,
the passage communicating with the piston or ram of the machine to be operated,
and e the passage for the discharge of the fluid.

page_text: gare the mitred inlet and exhaust valves respectively, and is the cam or
lever for operating the said valves: the said cam or lever being mounted upon the
spindle i, one end of which is supported in a bearing in a screw-cap in the casing
whilst the other end passes through a stuffing-box and has secured to its extremity
the lever by means of which the cam or lever cau be oscillated.
-m, m are passages communicating with the supply-passage band serving to allow
the fluid pressure to get behind the valves, so that, after the valve ƒ has been
opened, it can be closed with only a light spring or even by its own weight; and
so that, when the valve.g is closed, it cannot be opened by the fluid pressure on the
underside of the same.
n, o indicate springs placed above the valves, g respectively, and serving to
ensure the return of the same to their seats. p, are cup-leathers surrounding the
stems of the valves f, g, for preventing leakage around' the same.
In the arrangement shewn in Figures 1 and 3 the valves proper are arranged
vertically and are opened one at a time in order to allow the entrance of fluid
pressure through the passage b or the escape thereof through the passage e by the
impingement of one end or the other of the lever or cam h.
In the arrangement of my invention shewn in Figure 3 the lever is directly
connected with the valves by links r, r, and the holes in the lever h, through which
the connecting pins &, 8 pass; are slotted as indicated by dotted lines, to permit the
movement of the said lever relatively to the pins of one valve when the other
valve is opened.
:
**
In the working valve shewn in Figures 4 and 5 the valves proper are arranged
horizontally instead of vertically and the lever or cam is arranged to open one
or the other valve according as it is turned to the right or to the left.
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:
-:
1. A working valve, for use in connection with cranes, lifts, presses and other
machinery operated by hydraulic or other fluid pressure, having mitred valves
proper controlled by an oscillating cam or lever operated from the exterior of the
apparatus by means of a single spindle passing through a stuffing-box, substantially
as described.
2. In a working valve having mitred valves proper which are operated from the
exterior of the apparatus by means of a single spindle carrying a cam or lover,
passages for permitting the fluid pressure to act upon the backs of the mitred
valves, substantially as, and for the purposes, described.
3. The manufacture and use of the improved working, valves hereinbefore
described and illustrated by reference to Figures 1 and 2, Figure 3, and Figures 4.
and 5 of the accompanying drawings.
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2000