IMPROVEMENTS IN AUTOMATIC EXPANSION OR CUT-OFF VALVES
Year: 1884

page_text: THOMAS ROBERT HAY FISKEN of East Greenwich in the County of Kent
Engineer, and JAMES EDWARDES WEYMAN of Guildford in the County of Surrey
Engineer do hereby declare the nature of our invention for IMPROVEMENTS IN
AUTOMATIC EXPANSION OR CUT-OFF VALVES, to be as follows :—
Upon the back of the ordinary D or slide valve (which hereafter will be termed
the lower valve) is mounted a second slide valve which is made to move transversely
or otherwise to the lower valve, (this second valve will hereafter be termed the upper
valve) into each end of the lower valve are cast or cut one or more parts or openings
these openings communicate lead into each of the ordinary parts of the lower valve
respectively. Into the upper valve are made similar openings corresponding to the
openings in the lower valve these similar openings in the two valves are so arranged
that when the upper valve covers the openings at one end of the lower valve the
openings or ports at the other end of the lower valve will be open and " vice versa."
To give motion to the upper valve a stud or lug is cast or fixed upon it upon which
a slide block is mounted and which works in a slotted link the slot being made
somewhat wider than the block this link being fixed or mounted on one side
opposite its centre either within or without the steam chest so that it can be
noved to a greater or less angle to the line of movement or path of the lower
valve so that when the slotted link lies in the same line with the path of the lower
valve the upper valve receives no lateral motion from the movement of the lower
valve but when the link is moved so as to lie at an angle to the line of the path of
the lower valve then a transverse or other motion is given to the upper valve by
the slide block coming in contact with the link now at an angle with the line
of the path of the lower valve and it follows that the greater the angle of the link
with the line of the path of the lower valve the greater the travel or the greater
the motion given to the upper valve. The slotted link may give or govern the
motion of the upper valve through the valve rod of the lower valve, upon the lower
valve rod a stud or lever is fixed which is made to work in a bush, upon this bush
the slide block which works in the slotted link is mounted, the link as in the other
case being actuated by the governor, so that when the link lies in the same line as
the path of the lower valve or valve rod no rotary motion is given to the rod but
when the link lies at an angle to the path of the valve rod a rotary motion is given

page_text: to the rod greater or less according to the angle at which the link lies to the path
of the valve rod, Upon the valve rod at each end of the valve, are fixed levers with
slots or forks at the upper ends-these forks or levers gives motion to the upper
valve by acting on studs cast or fixed upon the upper valve. It will be seen that
the longitudinal travel of the lower valve or its rod gives a transverse or other
motion to the upper valve which motion is greater or less dependent upon the
position of the link, the link is actuated direct by the governor or otherwise, so
that the angle of the link to the line of the path of the lower valve is regulated by
the governor or otherwise, thus the parts or openings will be opened or closed to a
greater or less extent in accordance with the position of the governor, To give the
necessary adhision of the upper valvo to the lower valve so that they shall move in
conjunction one with the other except when the upper välve is worked or actuated
through the movement of the link a recess is made in the face of the upper valve
and where this recess covers the lower valve a communication is made through the
lower valve to the exhaust part of the valve.

page_text: We THOMAS ROBERT HAY FISKEN of 22, Lorne Terrace, East Greenwich in the
County of Kent, Engineer, and JAMES EDWARDES WEYMAN of 1, Stoke Terrace,
Guildford in the County of Surrey, Engineer, do hereby declare the nature of our
invention for IMPROVEMENTS IN AUTOMATIC EXPANSION OR CUT-OFF VALVES, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This Invention relates to certain improvements in automatic expansion or cut off
valves and actuating the same, The improved valve and the mode of actuating the
valve are illustrated on the accompanying two sheets of drawings. On sheet I.
The valve and the mode by which it is actuated when the slotted link is placed
within the slide valve chest are illustrated; fig. I. and 2. respectively represent a
longitudinal sectional elevation and a transverse sectional elevation. In fig; I. 1. is
the ordinary D. or slide valve which hereafter will be termed the lower valve). 2. is
the second valve which is made to move transversely upon the lower valve; This
second valve (hereafter will be termed the upper valve); 4. is a stud cast or fixed
upon the upper valve; 5., is a slide block which is mounted loosely upon the stud, 4.
and works in the slotted link 3; Upon one side, of the slotted link 3. a stud
bracket, 6. is fixed; 7. is, a bracket in which the stud of the stud bracket works;
the bracket 7. is held in position in being fixed to the slide valve chest ; as shown
in fig; 2. at A. and B. 8. shows the opening through the lower valve from the
recess g; into the exhaust port 10; of the lower valve. 11. is the valve rod.
12 and 13; are cavities which lead into the ordinary ports, 14. and 15, of the lower
valve. fig; 4. is a view looking upon the top face of the lower valve showing the
oblong openings, C, and D, longitudinally in each end of the valve and which open
respectively into the cavities; 13. and 14. 15. and 16. are guide pieces between
which the upper valve works, transversely, upon the lower valve; fig; 5. is.a view
looking upon the top face of the upper valve with the slotted link 3, having its
stud bracket removed so as to show the position of the slide block; 5. at half
stroke. E and F, are the oblong openings in each end of the valve corresponding
to the longitudinal openings in the lower valve; 17. is the rod which actuates the
slotted link, and which is connected in any convenient way with the governor of
the engine. The slide block 5, is made somewhat less in width than the width of
the slot in the slotted link, the purpose of which is that after the upper valve bas
covered the oblong openings of the lower valve in the return stroke the upper
valve may remain stationary until the lower valve has covered the ordinary ports
which admit the steam into the cylinder. The slotted link is shown in the position
in a line with the path of the lower valve so that the lower valve will travel back-
wards and forwards its full journey without giving any transverse motion to the
upper valve as the slide block, 5. will only touch the inner sides of the slotted link
at the end of its stroke at the points G, and H. fig; 6. shows the slotted link
moved to a greater angle from the line of the path of the lower valve and the
position of the slide block 5. at the end of its travel at 5 and 53 when the slotted

page_text: link is in this position the upper valve will have travelled transversely over the
upper face of the lower valve at each stroke the distance from c to d. and the
upper valve will have covered alternately the oblong openings in the ends of the
lower valve and cut off the steam. fig; 3 shows the slotted link 3. at its greatest
angle and the position of the slide block 5. at the end of its travel at 51 and 5º.
When the slotted link is in this position the upper valve will have travelled trans-
versely over the upper face of the lower valve the distance from a. to b. and
consequently will have cut off the steam at an earlier period of the stroke than it
did when in the position as at fig; 5. Sheet II. of the drawings illustrates the
arrangement when the slotted link. is placed outside of the slide valve box and
transverse motion is given to the upper valve through the valve rod of the lower
valve. fig. I. represents a sectional elevation of the lower and upper valves and an
elevation view of the slotted link and slide valve rod, 1. is the lower valve. 2. is
the upper valve. 71 and 72 are studs cast or fixed upon the upper valve; 6¹
and 6 are forked levers mounted fast upon the valve rod 11. 3 is the slotted
link. 4. is a bush upon which the slide block 5. works. 8. is an oblong opening
through the bush. fig; 2. is a view looking on the upper valve and showing the
oblong openings G₁ and H also the position of the slotted link 3. g¹ is a lever
mounted fast upon the slide valve rod 11; 18. is a swivel joint so that the valve
rod 11. can have a rotary motion. 10¹. is a bracket mounted fast upon the steam
chest or on any convenient part of the engine upon which bracket the slotted
link 3. is mounted loosely fig. 3. is an end elevation showing the forked lever 6'
mounted fast upon the slide valve rod 11. and the stud, 71. The fork a³ is made
some what wider than the diameter of the stud; 7'. fig; 4. is a sectional view of
the lever g¹. The slide block, 5. the bush, 4. and pin; 41 upon which the lever g¹
works. It will be observed when the slotted link is placed outside of the steam
chest the slide block is made the same width as the width of the slot in the slotted
link, In fig; 2. the slotted link is in the position in a line with the valve rod, so
that when the valve rod travels backwards and forwards carrying the slide block
with it the slide block will receive no motion from the slotted link, when however
the slotted link is moved to an angle from the line of the valve rod the slide block
will be moved up and down this motion will be communicated to the lever g¹
which is fast upon the slide valve rod 11, and give a rotary motion to the rod
which motion will be communicated to the upper valve through the levers, 6¹ and
62 and the studs 71 and 7' which will give a transverse motion to the upper
valve, The action of the Invention is as follows On Sheet I. fig; 5. The slotted link, 3.
is shown in the position in which it allows the slide block, 5. and the upper valve
to travel backwards and forwards with the lower valve without giving to them
any transverse motion and steam is freely admitted through the oblong ports of the
upper into the lower valve, and the steam is admitted and controlled wholly in its
admission into the cylinder in the ordinary way by the lower valve but when the
governor of the engine through the rod, 17. moves the slotted link or the link is
moved by any other agency so that the slotted link lies at angle or inclination
such as is shown on Sheet I. fig; 3. or fig; 6; then the upper valve will receive a
transverse motion and will regulate or controll the admission of steam more or less
according to the inclination which is given to the slotted link.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed; We declare that what
we claim is
First; The actuating of the upper valve automatically from the motion of the
lower valve by means of a slotted link and slide block placed within the steam
chest; substantially as described with reference to the accompanying drawings.
Second. The actuating of the upper valve automatically by having the slotted
link placed outside of the steam chest, the slotted link, slide block and lever giving
a rotary motion to the slide valve rod; substantially as described with reference to
the accompanying drawings.
.[

page_text: Third. Varying the length of the travel of the upper valve by giving a greater or
Jess inclination to the slotted link. ·
Fourth. The giving adhesion to the upper valve to the lower by means of a
recess in the top face of the lower valve and a communication from the recess to the
exhaust port.