An Improved Throttle Valve Actuating Device for Steam Engines.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
An Improved Throttle Valve Actuating Device for Steam Engines.
I, HEINRICH BRINKMANN, of 29A, Pariserstrasse, Munich, in the Empire of
Germany, Merchant, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object a throttle valve for steam engines which allows
a steam engine to be shut off (stopped) or caused to move only slowly from any.
desired point (for instance in the case of ships from the officer's bridge or from
the steersman's post) directly, that is to say entirely independently of the engineer.
This is mainly of great value on ships, as the man steering or the captain may
on danger threatening, immediately check the movement of the vessel as a first
measure of precaution without losing time by first issuing orders or signalling to
the engine room.
The valve is arranged in the steam pipe between engine and boiler and the valve
spindle is connected by a crosshead and links to the piston rods of two pistons
working in small cylinders arranged at each side of the valve spindle. A revers-:
ing lever and slide valve is provided at the place from whence the throttle valve
is to be actuated, said slide valve having pipe connections running to the afore-
said cylinders. By means of this lever the slide valve may be set in different
positions to control a suitable fluid pressure through the pipe connections to the
small cylinders whereby the pistons of said cylinders may be forced to take up
desired positions in order to actuate the throttle valve. In the mid-position of
the reversing lever.
Two passages or ports are under pressure and close the throttle valve so that
either the machine. remains stationary or continues to move slowly if the valve
body is provided with a suitable passage or admission opening.
If the reversing lever be moved forward the slide valve changes and the steam
pressure opens the throttle valve cone until a projection on the valve cone
encounters a stop which limits the movement. If the reversing lever be again
moved into the central position, the piston which, was moved upwards again closes
the throttle valve. If the lever be turned backwards the slide valve will unload
the other piston and the steam pressure will then lift this piston up to the limit
of stroke hereinbefore mentioned.
In order to diminish the throttling of the steam due to the friction of the pistons,
pipes are arranged, which support the steam by opening the valve as pressure.
passes through them and forces up the pistons, whilst back pressure valves are
arranged in the other pipes in order to prevent a sudden opening of the valve.
These back pressure valves allow the pressure to suddenly rise but close as soon as
the pipes are unloaded and allow the pressure existing in the cylinder to escape
but slowly through a small opening arranged in the back pressure valve cone.
The valve may be employed in steam engines of all kinds.
L
1
Dasambon 1007

page_text: COMPLETE SPECIFICATION.
An Improved Throttle Valve Actuating Device for Steam Engines.
I, HEINRICH BRINKMANN, of 29A, Pariserstrasse, Munich, in the Empire of
Germany, Merchant, 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 has for its object a throttle valve for steam engines which allows
a steam engine to be shut off (stopped or caused to move only slowly, from any
desired point (for instance in the case of ships from the officer's bridge or from
the steersman's post) directly, that is to say entirely independently of the engineer.
This is mainly of great value on ships, as the steersman or the captain may,
on danger threatening, immediately check the movement of the vessel as a first
measure of precaution without losing time by first issuing orders or signalling to
the engine room.
In the accompanying drawings—
Figure 1 shows the valve in detail;
Figure 2 is a view of the whole apparatus;
Figure 3 is a cross section on the line A B of Figure 1;
Figure 4 a modified form of construction.
'
The valve is arranged in the steam pipe between engine and boiler and the valve
spindle is connected by a crosshead and links to the piston rods of two pistons
working in small cylinders arranged at each side of the valve spindle. A revers-
ing lever and slide valve is provided at the place from whence the throttle valve
is to be actuated, said slide valve having pipe connections running to the afore-
said, cylinders. By means of this lever the slide valve may be set in different
positions to control a suitable fluid pressure through the pipe connections to
the small cylinders whereby the pistons of said cylinders may be forced to take
ups desired positions in order to actuate the throttle valve. In the mid or stop
position of the reversing lever j shown in Figures 1 and 2, two passages or ports a
and are under pressure and close the throttle valve so that either the machine
remains stationary or continues to move slowly if the valve body e is perforated
with a suitable passage or admission opening.
If the reversing lever j be moved forward (towards I) the slide valve changes
and uncovers the passage a and the steam pressure opens the throttle valve conce
until a projection e¹ on the valve cone e encounters a stop h which limits the move-
ment. If the reversing lever be again moved into the central position, the piston k
which was moved upwards again closes the throttle valve e. If the lever j be
turned backwards (position II) the slide valve will unload the other piston k¹
through the passage b and the steam pressure will then lift this piston up to
the limit of stroke hereinbefore mentioned.
In order to diminish the throttling of the steam due to the friction of the
pistons, pipes c and d are arranged, which support the steam by opening the
valve as pressure passes through them and forces up the pistons kk whilst back
pressure. valves are arranged in the other pipes a and b in order to prevent a
sudden opening of the valve. These back pressure valves allow the pressure to
suddenly rise but close as soon as the pipes ab are unloaded and allow the pressure
existing in the cylinder to escape but slowly through a small opening v¹ arranged
in the back pressure valve cone v.
The valve may be employed in steam engines of all kinds.
In the modification shown in Figure 4 the opening and closing of the valve
cone e takes place by means of a single pressure cylinder with a piston k arranged
over the valve. The slide box has accordingly also only two pipes a and c of

page_text: which one a opens above and the other c beneath the pinion k in the cylinder.
The valve spindle also serves as guide spindle for the piston k.
If in this form of construction the reversing lever j be placed as shown in
position II the pipe a receives the pressure and closes the valve e so that either
the machine remains stationary or if the valve body has a suitable passage or
admission opening, moves slowly.
If the lever be placed at I on the other hand the pressure in a is reduced and c
receives the pressure causing the piston k to rise and open the valve e until the
valve extension e' encounters the stop h. In this form of construction the pipe a
is alone provided with a back pressure valve v of the kind described.
As may be seen from this, the mode of working of this simplified form of con-
struction is essentially the same as in the first described construction.
:
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is;
-
1. A throttle valve for steam engines characterised by two pressure cylinders
being arranged on a perforated valve, the pistons (kk) of which cylinders in the
mid position of a reversing lever (j) connected with a slide valve arrangement aro
adapted to close the said valve (e), and in the forward or backward positions
(I and II) of said lever to open the said valve, substantially as hereinbefore set
forth.
2. A form of construction of the throttle valve herein before described in which
the operation of the valve takes place by means of a single pressure cylinder, the
piston of which in one end position of a reversing lever connected with the slide
gear closes the valve, and in the other end position of said lever opens said valve,
substantially as described.
3. In a throttle valve device such as herein before described, the arrangement in
the pressure passages (a and b) of a back pressure valve adapted to be raised by
the pressure and to allow the same to rapidly enter the cylinder but on the unload-
ing of the pressure to close the passage and allow the pressure slowly to escape
from the cylinder through a suitable aperture, substantially as described.
Dated this 5th day of July 1898.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.