Improvements in Throttle Valve Controlling Mechanism.
Year: 1899

page_text: Improvements in Throttle Valve Controlling Mechanism.
I, JOHN KILLIP, of Chelsea-Lea, Sefton Road, Walton, Liverpool, Engineer,
do hereby declare the nature of my said invention to be as follows:-
My invention relates chiefly to governors for steam engines in which the
throttle-valve is of the piston type with one or more ports or passages of differ-
ential width or proportion for effecting the gradual cut-off of steam under the
action of the governor balls. In such construction of governor the effective
action of the throttle-valve depends largely upon the easy working of the parts
and should any friction get up owing to dirt such action is seriously interfered
with.
;
The object of my invention is to provide means for operating the piston throttle
valve by steam, but under the control of the governor balls, so that the entire
load of moving the throttle valve is taken off the balls, thus ensuring a more
positive and at the same time sensitive action of the governor.
In carrying out my invention I employ a throttle valve of, by preferenco
piston type with ports or passages of different widths and designed to cover or
uncover certain corresponding ways or ports in the valve casing differentially,
that is, the ports close in succession as the piston moves in its casing. The rod
connected with such valve passes through a chambered bush or gland, and ter-
minates within the valve casing in a piston.
Sliding within a further casing attached to or identified with the main casing
I arrange a piston which acts as a steam distributing valve and is made hollow
and with transverse ports and annular peripheral grooves, and in the substance
of the said casing I form a further set of openings or ports, one of which com-
municates with a live steam supply, and the other forms an exhaust steam outlet.
To the stem of the said piston I connect the usual auxiliary spring and lever
devices for holding it in constant abutment with the usual collar spindle of the
governor balls, which is surrounded by the usual adjustable spring for resisting
the centrifugal action of the governor balls, and means for regulating the load.
With the engine running at its normal speed, the openings in the throttle-
valve uncover the openings, more or less, in the valve casing and both the live
and exhaust steam openings in the slide valve casing are, for the time being,
covered by the steam distributing valve aforesaid, but the slightest movement
of the slide valve by the increase, or decrease, of speed opens either one or the
other of the said passages communicating with the piston operating the throttle-
valve, and thus either admits live steam into the casing, which acts upon the
piston on the end of the rod connected with the throttle-valve, and drives such
rod and throttle valve forward, and in consequence shuts off steam, wholly or
partially, or, as the engine comes back to its normal speed gradually covers the
live steam inlet and uncovers the exhaust outlet, and allows the throttle valve
(under the altered balance of pressure) to again open and increase the supply
of steam.

page_text: Suitable provision is made for allowing the steam to act in the full area of the
piston rod end, and to drain away the condensation, and any slight pressure
of steam that might tend to gather at the rear of the piston; also to accomodate
the adjustment and setting of the several parts according to requirements.
1
1
1000
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improvements in Throttle Valve Controlling Mechanism.
I, JOHN KILLIP, of Chelsea-Lea, Sefton Road, Walton, Liverpool, 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:-
My invention relates chiefly to governors for steam engines in which the
throttle-valve is of the piston type with one or more ports or passages of differ-
ential width or proportion for effecting the gradual cut-off of steam under the
action of the governor balls and the object of my invention is to provide means
for operating the throttle-valve by steam under the control of the governor balls,
so that the entire load of moving the throttle-valve is taken off the balls and
a more positive and sensitive action is obtained.
To make my invention clear I have hereunto annexed a sheet of drawings illus-
trating the same in detail and will now proceed to describe the same with the
aid of the various figures and letters of reference marked thereon.
Fig. 1 illustrates a longitudinal section, and Fig. 2 a plan (in part) of a steam
engine governor embodying my improvements. Fig. 3 illustrates an end view
of the valve portion only. Fig. 4 illustrates an important detail.
In carrying out my invention I employ a throttle-valve (A) of, by preference
piston type with ports or passages (13), and designed to cover or uncover certain
corresponding ways or ports (C) in the valve casing for the admission or cutting
off of steam to or from the engine to be governed. Connected with such valve
is a rod (D) which passes through a chambered bush or gland (E) and terminates
within the valve casing in a piston (F). Sliding within a further casing (G)
attached to, or identified with the main casing (H) I arrange a piston slide
valve (I) with stem (I) and the said piston slide valve is made hollow, has trans-
verse ports (J) and annular peripheral grooves (K). In the substance of the said
casing (G) I form a further set of openings or ports (L), (L*) one of which
.communicates with a live steam supply and the other forms an exhaust steam
outlet. To the stem (I) I connect the lever (N) which acting under the tension
of spring (M) regulated by nuts (M) holds the stem in constant abutment with
the usual collar spindle (0) of the governor balls (P) whilst such lever spring
and nuts also act as an auxiliary speed regulator for the governor balls. The
spindle is surrounded by the usual adjustable spring (Q) for resisting the
centrifugal action of the governor balls and means for regulating the load..
With the engine running at its normal speed the openings (C) are uncovered
by means of the steam from the boiler acting against the valve (A) which owing
to the rod (D) is out of equilibrium to an extent equal to the area of such rod.
The live and exhaust steam openings (L) and (L) are for the time being
covered by the slide valve (I); but a slight movement of such valve by the increase
of speed immediately uncovers the passage (L) and thus admits live steam into

page_text: the casing (G). Such steam which is at the same pressure as that acting
on or passing through the valve (A) immediately acts upon the piston (F) on the
end of the rod (I)) and by reason of the difference in area between the rod (D)
and the piston (F) drives such rod and the throttle valve forward and thereby
shuts off steam to the engine slowly or quickly according to the action of the
governor balls. As the engine comes back to its normal speed the valve (I)
gradually recovers the live steam inlet (L) and uncovers the exhaust outlet (L*)
as shewn in Fig. 1, and thus allows the throttle-valve (A) (under the altered
balance of pressure) to again uncover the openings (C) and increase the supply
of steam.
For allowing the steam to act upon the full area of the piston rod end I provide
the piston (F) with studs or knobs (R) and for draining away the condensation and
removing any slight pressure of steam that might tend to gather at the rear of
the piston (F) I provide a small drain pipe (S).
Although more particularly described in reference to a piston form of throttle-
valve I may apply my invention with equal advantage to the ordinary construc-
tion of valve the connection of the piston (F) only requiring to be varied to suit
requirements, and whilst preferring the stem of valve (I) to abut against the
spindle (0), I may rigidly connect it to such spindle and dispense or retain the
lever (N) and spring (M).
From the foregoing description it will be seen that the work of operating the
throttle-valve is taken off the governor balls entirely, which have only now
to move the slide valve (I).
.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
1: In a steam engine governor, operating the throttle-valve by live steam
under the controlling action of the governor balls, substantially as set forth.
2: In a steam engine governor, a throttle-valve, rod and piston disconnected
from the usual collar spindle, and a slide valve of the kind described between the
said piston and the collar spindle, and all mounted and operating substantially
as and for the purposes set forth.
3: In steam engine governor, the combination and arrangement of parts,
substantially as and for the purposes set forth..
A
Bated this 6th day UL CCCIID.
t1115
U FCCCHI D
JOHN KILLIP.
By John G. Wilson & Co., Fels. I.P.A.,
Agents for the Applicant.
55, Market Street, Manchester.
JOHN KILLIP.
By John G. Wilson & Co., Fels. I.P.A.,
Agents for the Applicant.
55, Market Street, Manchester.