Improvements in Injectors.
Year: 1897

page_text: Date of Application, 31st July, 1897
Complete Specification Left, 18th Apr., 1898-Accepted, 4th June, 1898
Improvements in Injectors.
A communication by JOSEF WILDEMANN, of 87, Fehrbellinerstrasse, Berlin, in the
Empire of Germany, Manufacturer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, and 322, High Holborn, in the County of Middlesex, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention has for its object an improved injector which is characterized as
against all the forms of construction hitherto known by the access to the various
valves being rendered more convenient by the use of a removable cap, whilst the
suction of air through the injector and the return of the feed water in case it drops
and the boiler valve should become untight is prevented.
The invention is shown in the accompanying drawings, in which
Figures 1 and 2 are longitudinal sections at right angles, and
Figure 3 a cross section of Figure 1 on the line a-b.
•
Referring to the drawings, the invention will now be explained as follows:-
All three valves, that is to say, the steam, feed and trickle valve are placed about
at the same level and are arranged in a common piece c and are rendered accessible
by the removal of a head or cap d arranged on the under side of the injector body c
without it being necessary to disconnect the injector from the pipe. The cap d has
also a part of a nozzle or pipe e. By the arrangement of this cap the valves may
be examined from the outside as to their cleanliness and capability of working.
The trickle valve f is formed as an automatic back pressure valve and arranged
in the injector body c. By this means the result is attained that it only opens in
case the inner pressure of the injector is greater than the outer. Suction of air
through the injector is therefore excluded because the valve is not operated
compulsorily but as a back pressure valve. The feed valve g is formed as an
automatic back pressure valve in order that it may close and prevent the back flow.
of the feed water in case the injector should cease to function from any reason, or the
boiler valve should become untight. As however the case may very easily arise in
which the water returning from the feed pipe into the injector presses the valve g
against its walls and prevents the descent of the same or in which the valve g is
coated with dirt and thereby does not close automatically, the said valve is con-
nected by means of a guide bar h with a rod i and screw device k to the steam valve,
a pin o of the rod / engaging in a corresponding boring or recess in the valve g.
The stroke of the valve 9 is thus suitably limited at each opening of the steam
valve m, and when the steam valve is closed a compulsory closing of the feed
valve g also takes place.
This injector may be examined as regards its working by removing the cap d
without disconnecting the injector from the pipe, but an interruption of its working

page_text: will however never take place so long as the valves are tight because the suction
of air is prevented and the correct closing of the valve is secured.
The steam supply takes place at r, the water supply at s, the discharge of the
trickling water at x and of the feed water at y.
In place of the ordinary screw plug z of the cap d a shut off cock may be
employed, which in the event of the injector acting indifferently from any reason
may be opened and again closed after the working of the injector has again started.
Dated this 30th day of July 1897.
A communication by JOSEF WILDEMANN, of 87, Fehrbellinerstrasse, Berlin, in the
Empire of Germany, Manufacturer..
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, and 322, High Holborn, in the County of Middlesex, Civil 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 has for its object an improved injector which is characterised as
against all the forms of construction hitherto known by the access to the various
valves being rendered more convenient by the use of a removable cap, whilst the
suction of air through the injector and the return of the feed water in case it drops
and the boiler valve should become untight is prevented.
The invention is shown in the drawings accompanying the Provisional Specifi-
cation, in which,
Figures 1 and 2 are longitudinal sections at right angles, and
Figure 3 a cross section of Figure 1 on the line abi.
Referring to the drawings, the invention will now be explained as follows:
All three valves, that is to say, the steam, feed and overflow valve are placed about
at the same level and are arranged in a common piece c and are rendered accessible
by the removal of a head or cap d arranged on the under side of the injector body c
without it being necessary to disconnect the injector from the pipe. The cap d has
also a part of a nozzle or pipe e. By the arrangement of this cap the valves may
be examined from the outside as to their cleanliness and capability of working.
The overflow valve f is formed as an automatic back pressure valve and arranged
in the injector body c. By this means the result is attained that it only opens in
case the inner pressure of the injector is greater than the outer. Suction of air
through the injector is therefore excluded because the valve is not operated
compulsorily but as a back pressure valve. The feed valve g is formed as an
automatic back pressure valve in order that it may close and prevent the back flow
of the feed water in case the injector should cease to function from any reason, or the
boiler valve should become untight. As however the case may very easily arise in
which the water returning from the feed pipe into the injector presses the valve g
against its walls and prevents the descent of the same or in which the valve g is
coated with dirt and thereby does not close automatically, the said valve is con-

page_text: nected by means of a guide bar h with a rod i and screw device k to the steam valve,
a pin o of the rod h engaging in a corresponding boring or recess in the valve g.
The stroke of the valve g is thus suitably limited at each opening of the steam
valve m, and when the steam valve is closed a compulsory closing of the feed
valve g also takes place.
cap
This injector may be examined as regards its working by removing the d
without disconnecting the injector from the pipe, but an interruption of its working
will however never take place so long as the valves are tight because the suction
of air is prevented and the correct closing of the valve is secured.
The steam supply takes place at r, the water supply at s, the discharge of the
overflow water at and of the feed water at y.
In place of the ordinary screw plug z of the cap d a shut off cock may be
employed, which in the event of the injector acting indifferently from any reason
may be opened and again closed after the working of the injector has again started.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is:-
1. An improved injector, characterised by the overflow valve being formed as
an automatic back pressure valve, and the feed valve as a back pressure valve with
adjustable length of stroke compulsorily guided by the guiding parts of the steam
valve, and all three valves being arranged in an injector body common to all, with
the object of preventing the drawing in of air and the forcing back of the water in
the injector, substantially as herein before described.
2. In an injector such as described, the arrangement of a removable cap or cover
consisting of one or more parts and serving as a casing, in which cap the part of
the nozzle may be wholly or partially constructed and also a part or all of the valve
seats with the object of enabling the parts of the valves and nozzle to be examined
as regards their cleanliness and proper working by the removal of the cap without
it being necessary to disconnect the injector from the pipe, substantially as
described.
Hay po
WM. P. THOMPSON & Co.,
Patent Agents, of Liverpool, Manchester, Birmingham, and London.