provements in and relating to the Governing or Regulating of Marine and other Engines.
Year: 1896

page_text: Date of Application, 20th Apr., 1896
Complete Specification Lelt, 20th Jan., 1897-Accepted, 10th Apr.. 1897
PROVISIONAL SPECIFICATION
Improvements in and relating to the Governing or Regulating of
Marine and other Engines.
We, DAVID JOHNSTON, Engineer, of 163 Berkeley Street, and WILLIAM
MCADAM, Sugar Broker, of 41, Virginin Street, both in the County of the City
of Glasgow, do hereby declare the nature of our invention to be as follows:-
This invention has reference to the governing or regulating of marine and other
engines with special adaptation for compound or multiple cylinder condensing
engines having steam spaces between various cylinders for different expansions and
consists in having a pump or pumps actuated from the main crosshead or pump
levers or from eccentrics on the shaft as may be most suitable to the design of
engine, these pumps being so arranged that a constant flow of water will be forced
against a loaded valve regulated by a screw but having a spring between it and
the regulating screw with a stopper, beyond which it cannot be closed, so that it
will act as a safety valve and prevent injury to the pipes.
The seat of this valve, will by preference have a nuch more acute augle than
that generally given namely 45 degrees.
When this valve is adjusted to a given pressure, at a given speed of the pumps
which would be also that of the engine, the pressure in the pipes or any
intermediate chamber between the pumps and valve will be raised.
This additional pressure to regulate the engine would under one arrangement be
applied as follows:-
A throttle valve would be placed on the main steam pipe, near its entrance into
the valve casing and would be held open by an adjustable spring with regulating
screw acting on one end of a lever attached to the valve opposed to the spring.
On the same or opposite end of the lever, a small cylinder would be fixed which in
one form of these improvements would communicate with the pipe between the
pamp and discharge valve before described.
Having determined the speed the engine is to work at, by adjusting the resistance
of the spring on the throttle valve and the back pressure on the discharge valve
from pumps, they could be regulated just to equally balance so that should the
engine go quicker, the equilibrium would be disturbed and the valve corre
spondingly closed.
For engines of the compound type, or multiple cylinder engines having one or
more cylinders for carrying out various degrees of expansion, a bye pass pipe would
be fitted between the intermedinte chambere, and the condenser having a valve
between kept closed by a spring with a cylinder and piston acting in the opposite
direction in communication with the pressure pipe from the pumps and regulated as
described for main steam pipe but requiring a little more pressure to open them.
In another form of these improvements instead of the increased pressure from
the pumps acting direct on the throttle and bye pass valves it would act on the
valve of a small cylinder attached to each, having a valve held in position by a
spiral spring keeping the throttle valve open and the bye-pass valves closed, and in
opposition to the spring a small cylinder or diaphragm would be connected to the
pressure pipe from pumps so as to reverse the valve and the steam pressure would
sbut the throttle valve and open the bye-pass valves as before described.

page_text: Although these improvements have been described as specially applicable to
marine engines, they could also be applied with equal advantage to many forms of
land engines and to large pumping engines of the Cornish and other types, and
although the pump or pumps have been described as discharging, through one
loaded valve, they may be arranged, to discharge through two or more, according
to the nature and arrangement of the engine they are applied to and act through
two or more cylinders diaphragms in regulating the engine.
Tlated this 14th Amril 1808.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
Improvements in and relating to the Governing or Regulating of
Marine and other Engines.
We, DAVID JOHNSTON, Engineer, of 163 Berkeley Street, and WILLIAM
MCADAM, Sugar Broker, of 41 Virginia Street, both in the County of the City
of Glasgow, do hereby declare the nature of our invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement in writing :-
This invention has reference to the governing or regulating of marine and other
engines with special adaptation for compound or multiple cylinder condensing
engines having steam spaces between various cylinders for different expansions.
And in order that our said invention and the manner of carrying same into
practice may be properly understood we have hereunto appended an explanatory
sheet of drawings in which
Figure 1 represents au end elevation of a marine engine having our improvements
applied thereto.
Figure 2 represents an enlarged sectional elevation of the small cylinder and
connections to valve between intermediate chambers and condenser, and
Figure 3 represents a sectional elevation of the fluid pressure valve which is
placed between the pumps and the small cylinder.
Referring to these drawings, our improvements consist in having a pump or
pumps A actuated from the main crosshend or pump levers B or from eccentrics
on the shaft as may be most suitable to the design of engine, these pumps A being
so arranged that a constant flow of water will be forced against a loaded valve C
shown particularly in Figure 3, the water entering by the pipe F connected to the
chamber c and from same by the pipe to the cylinder diaphragm F. The
valve C is regulated by a screw but having a spring between it and
the regulating screw with a stopper C beyond which the disc wheel C cannot
pass so that it will act as a safety valve and prevent injury to the pipes, the
brauche being overflow to bilge or ship's side.
The seat of this valve C will by preference have a much more acute augle than
that generally given namely 45 degrees.
When this valve is adjusted to a given pressure, at a given speed of the pumps
which would be also that of the engine, the pressure in the pipes or any
intermediate chamber between the pumps and valve will be raised.
This additional pressure to regulate the engine would under one arrangement be
applied as follows:-An ordipary throttle valve not shown in drawings would be
placed on the main steam pipe, near its entrance into the valve casing.
For engines of the compound type or multiple cylinder engines having one or
more oylinders for carrying out various degrees of expansion, a bye pass pive D

page_text: would be fitted between the intermediate chambers D' and the condenser D'
having a valve d between kept closed by a spring with a oylinder and piston acting
in the opposite direction in communication with the pressure pipe from the pumps
and regulated as described from main steam pipe but requiring a little more
pressure to open them.
By these improvements the increased pressure from the pumps A acts by way of
pipe F through the loaded valve C and pipe F¹ on the piston or diaphragm F and
actuates the valve E of a small cylinder E' connected to the valve d on each
pipe D, the valve E being held in position by a spiral spring E to keep the throttle
valve on the main steam pipe of the engine open and the bye pass valve d closed.
In opposition to the spring E' a small cylinder or diaphragm F connected as above
described from the pumps A would when the pressure increases reverse the valve E
and the steam pressure would shut the throttle valve on the main steam pipe and
open the bye pass valves d, making direct communication from the other steam
chambers and cylinders to the condenser.
The piston rode of the cylinder E' instead of being connected direct to the
bye pass valve d would have a round head as shown dotted at e' to connect it by
a link to the lever of throttle valve on main steam pipe.
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:-
The governing or regulating of marine or other engines by having a controlling
cylinder with valve placed between intermediate chambers and condenser and
throttle valve and operated by pumps from the main engine, in combination with
a valve for raising the fluid pressure sufficient to actuate the bye pass and throttle
valves, substantially as heroín described in reference to and shown in the accom-
panying drawings.
D
ليمي
T
1007
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.