Improvements in and connected with the Valves of Steam Engines.
Year: 1890

page_text: Date of Application, 5th July, 1890
Complete Specification Left, 4th Apr., 1891-Accepted, 9th May,
1891
PROVISIONAL SPECIFICATION.
Improvements in and connected with the Valves of Steam Engines.
I CHARLES PEGG of 78 Whitmore Street Hockley Birmingham in the County
of Warwick Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in the valves employed in steam engines,
for distributing the steam to the cylinders, and to the gear arrangement connected
therewith.
It consists in the employment of a circular valve of peculiar form, having port
ways or passages therethrough, communicating from the steam chest or pipe, to
the cylinder, and also in the employment in connection with the eccentric valve
slide rod, of weighted cam levers, each carrying a pawl tooth, with rocking levers,
each also carrying a pawl tooth or tappet, corresponding to and operating with the
aforesaid pawl tooth upon the cam levers; these rocking levers being further
connected to the dash pot.
At the sides of these levers are also double cam levers which operate in their
upper part, at certain times the cam weighted levers upon the sliding bar; whilst
their lower end is connected to the rock shaft which is in communication with the
governors, whereby the supply of steam is regulated automatically according to the
speed of the engine. A similar arrangement is also employed in connection with
the exhaust valves.
In detail of construction, this my invention may be varied considerably without
departing from the nature of the same, but generally it may be described thus,
arranged for the admission valves.
At each end of the cylinder, a circular valve seat is provided, having upon the
one side a port or opening communicating with the steam supply, and upon the
other side two or more port holes lying side by side (with a bar between)
communicating with the interior of the cylinder, the area of the two said port holes
equalling that of the aforesaid inlet port.
This valve is preferably made of a taper form, so that from time to time as wear
takes place, it may be adjusted in order to preserve steam tightness.
At the outer end of the spindles of the said valves, are provided the rocking
levers, whose fulcrum is coincident with the centre of the valve. To the lower end
of each of these levers is connected a rod which in their turn are connected again,
as aforesaid, with the dash pot; whilst at their upper end is provided a pawl tooth.
Immediately above these pawl teeth is a sliding spindle operated by an eccentric
upon the main or other suitable shaft of the engine. At such parts this spindle is
made to carry a weighted lever, having upon its underside a pawl tooth, which
agrees with & operates upon the pawl tooth upon the rocking levers. This lever is
furthur extended so that a portion of it rides upon the double cam, provided at the side
of the rocking levers aforesaid. Thus, the ordinary motion of the eccentric rod opens
and closes the ports for the admission, cut off or exhaust of the steam, in which the
pawl teeth upon the eccentric rod levers, pull the rocking levers over a certain
required distance, and in doing so, open or close the valve as the case may be, to
admit or exhaust the steam. The action of the governors upon the double cam
levers is such, that with the varying speed of the engine, the tooth upon the cam
levers carried by the slide rod is raised or lowered, by which the said pawl tooth
engages or disengages with the tooth upon the valve lever sooner or later, thereby
opening or closing the valve sooner or later accordingly.

page_text: By providing the double or more outlet ports in the valve, a full admission, or cut
off, is effected with but a small motion or travel of the valve.
Dated this 4th day of July 1890.
CHARLES T. POWELL,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in and connected with the Valves of Steam Engines.
I CHARLES PEGG, of 78 Whitmore Street, Hockley, Birmingham, in the County
of Warwick Engineer, 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 relates to improvements in the valves employed in steam engines
for distributing the steam to the cylinder and to the gear arrangement connected
herewith.
It consists in the employment of a circular valve of peculiar form having port
ways or passages therethrough communicating from the steam chest or pipe, to the
cylinder and also in the employment in connection with the eccentric valve slide
rod, of weighted cam levers each carrying a pawl tooth, rocking levers cach also
carrying a pawl tooth or tappet, corresponding to and operating with the aforesaid
pawl tooth upon the cam levers; these rocking levers being further connected to
the dash pot.
At the sides of these levers is also a double cam lever which operates in their
upper part, at certain times the cam weighted lever upon the sliding bar; whilst
their lower end is connected to the rock shaft which is in communication with the
governors, whereby the supply of steam is regulated automatically according to the
speed of the engine.
In order to more particularly explain this my invention. I have appended
hereunto illustrative sheets of drawings upon which are figures and reference
numbers similar numbers referring throughout the several views to the same
thing or part.
Fig. 1 is an elevation of this my improved arrangement.
Fig. 2 is a part plan of the same.
Fig. 3 is a sectional view of the rocking levers and double cam lever on
line A-B, Fig. 1.
Fig. 4 is a detached detail side and end elevation of the weighted lever.
Fig. 5 is a detached detail side and end elevation of the double cam lever.
Fig. 6 is a detached sectional view of the valve and valve seat.
Fig. 7 is a sectional transverse view of the valve and seat on line C-D (Fig. 6).
Fig. 8 is a sectional transverse view of the valve seat cover and spindle on
line E-F (Fig. 6).
Fig. 9 is a sectional transverse view of the valve and seat on line C—D (Fig. 6)
but showing the valve moved forward on its face a short distance.
In illustrating this my invention I have only shown such parts that constitute or
are closely connected with this my invention.
In detail of construction, this my invention may be varied considerably without
departing from the nature of the same, but generally it may be described thus :-
At each end of the cylinder 1, a circular valve seat 2, 2, is provided having upon
the one side a port or opening 3, communicating with the steam supply pipe 4,
shown in dotted lines, see Fig. 1, and upon the other side two port holes 5, 5, lying
side by side (with a bar 6 between) communicating with the interior of the
cylinder 1, the area of the two said port holes 5, 5, equalling that of the aforesaid
inlet port 3. The valve 7, see Figs. 6, 7 & 9, is preferably made of a taper form,

page_text: so that from time to time, as wear takes place, it may be adjusted in order to
preserve steam tightness. This is effected after the following manner :-
Within the valve seat cover 8, and fitting upon the valve spindle 9, is an
adjustable sleeve 10, which is securely held therein by means of the said cover
being split at 11, and cramped together by the bolt 12, thereby firmly gripping and
holding the said sleeve in any adjusted position. As shown the front end 13, of
the valve works against the end of the sleeve, the rocking lever 14, working against
the front end of the said sleeve. Now, when the valve has worn somewhat and
become loose in its seat, the bolt 12, is slackened, and the sleeve 10, is moved along
the spindle until the valve is again brought forward to a proper fit in its seating,
when the said sleeve is again secured by the bolt 12, as before.
At the outer end of the spindles 9, 9, of the said valves, are provided the
rocking levers 14, whose fulcrum is coincident with the centre of the valve 7.
To the lower end of each of these levers (see Fig. 1) are connected rods 15, 15,
which in their turn are again connected as aforesaid with the dash pot at 16, 16,
whilst at the upper ends of these levers 14, 14, are provided pawl teeth 17, 17.
Immediately above these pawl teeth is a sliding spindle 18, operated with a
reciprocating motion by an eccentric upon the main or other suitable shaft of the
engine. At such parts, this spindle is made to carry weighted levers 19, 19, having
upon their underside a pawl tooth 20, 20, which agree with, and operate upon the
pawl teeth 17, 17, upon the rocking levers 14, 14. These levers 19, 19, are further
extended so that the portion 21, of them ride upon the double cams 22, 22, carried
upon the rocking levers 14, 14, aforesaid.
Thus, the ordinary reciprocating motion of the eccentric rod 23, opens and closes
the ports for the admission, and cut off, of the steam, by reason of the pawl
teeth 20, 20, upon the levers 19, 19, acting upon the pawl teeth 17, 17, and pulling
over or part rotating the rocking levers 14, 14, and in so doing operates the
valves 7, 7, to admit or cut off the steam, the said valves, and the rocking levers
being brought back by means of the weighted rods connected with the dash pots
at 16, 16, in the ordinary manner.
24, is a rocking lever fulcrumed at 25, and connected by means of rod 26, to the
governors of the engine. Each end of this rocking lever 24, is again connected by
means of rods 27, 27, to the lower end of the double cam levers 22, 22, the upper
surface of which acts upon the extended portions 21, 21, of the weighted
levers 19, 19. Thus, as the speed of the engine varies, the governors more or less,
partly rotate the rocking lever 24, and in so doing the cam parts 28, 28, 28, 28, lift
accordingly, the extended parts 19, 19, by which, the pawl teeth 20, 20, engages
or disengages with the pawl teeth 17, 17, upon the rocking levers 14, 14, sooner or
later accordingly.
By providing the double outlet ports 5, 5%, in the valve 7, a full admission or cut
off is effected with but a small motion or rotating travel of the valve, as seen
for instance in Fig. 9, where the cut off is equal to twice the travel of the valve.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination in steam valve gear, of the sliding rod 18, having weighted
levers 19, 19, with teeth 20, 20, and extensions 21, 21, with a steam valve 7, having
rocking levers 14, 14, having teeth 17, -17, and double cam levers 22, 22, connected
with the governors of the engine, all constructed and operating substantially as
described and illustrated.
2. The combination of the steam cylinder 1, and the necessary parts constituting
the operating valve gear, of the steam circular and conical valve 7, having steam
inlet and two or more steam outlets, 5", 5", substantially as described and illustrated
on the drawings.
3. The combination of the conical valve 7, valve seat 2, and cover 8, having the

page_text: splitway 11, and grip bolt 12, with the adjustment sleeve 10, constructed and
operating substantially as described and illustrated upon the drawings.
Dated this 3rd day of April 1891.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicant's Agent.