IMPROVEMENTS IN INJECTORS
Year: 1884

page_text: I WILLIAM ROBERT PARK, of Taunton, in the County of Bristol and State of
Massachusetts, one of the United States of America, Gentleman, do hereby declare
the nature of my Invention for "IMPROVEMENTS IN INJECTORS" and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
In the accompanying Drawings
Figure 1 shows a view in side elevation of an injector. of the single action form
with my Invention applied thereto.
Figure 2 a vertical central section of the same.
Figure 3 a view in side elevation of an injector of the double acting form with
my Invention applied to it, and
Figure 4 a central, vertical section of the same.
The object of my Invention is to provide means for automatically preventing or
relieving vacuum in the steam chambers or steam pipes of injectors and to this end
It consists in the valve constructed, arranged and operating as hereinafter
described and more specifically pointed out in the claims.
In the Drawings A in Fig's. 1 and 2, designates the casing of a single action
injector of an ordinary and well known form. C designates the steam -chamber;
D the steam admitting valve, E the steam nozzle; F the combining tube; F the
water chamber; F1 the water supply pipe; G the check-valve and H the overflow
valve. From the side of the steam chamber C extends the passage I in arm K
projecting from the casing of the steam chamber as shown.
At the end of this arm is an enlargement L which is provided with the vertical
passage M intersecting the end of passage I and preferably made larger in diameter
than the latter. At the upper end of that portion of passage M which extends
downward from. passage I is formed a seat N for the puppet valve O. The rest of
the passage M above this valve seat is as shown made large enough to admit the.
removal and insertion of the valve in place. A screw plug P closes the upper end
of the passage and is formed with a central cylindrical recess p opening downwards.
The valve guiding stem fits and reciprocates below in the lower portion of the
passage M and above in the recess in the screw plug P described above.
This valve stem is formed of four plates radiating from the axis of the stem but,
I do not wish to limit myself to such construction or number of radiating plates,

page_text: As the object of so constructing the valve stem is to prevent said stem from
closing entirely the recess or passage in which it is guided, a cylindrical stem
having a number of longitudinal grooves along its surface could obviously be used
instead of the form shown or a cylindrical stem with a central longitudinal passage
connected with radial openings or passages opening close above and below the
valve proper.
The overflow valve H which is of the well known form capable of adjustment
to bring its escape pipe into any desired position I prefer to place as shown at or
beyond the end of the combining tube F.
As I do not claim this valve or the construction or arrangement of any of the
parts of the injector proper, it is not necessary for me to describe such injector or
valve further herein.
In Figs. 3 and 4 I show my vacuum relieving and preventing device as applied
to a double action injector.
In this form the valve passage 11 opens into the steam chamber C which
communicates with the two steam nozzles E¹ E¹.
As the rest of the injector is of a common and well known construction it is not
necessary to describe its construction further.
My vacuum preventing device is especially applicable to any non lifting injector
whether the overflow be arranged at the end of the combining tube, as shown, or
at the interval between the combining and delivery tubes as in the original Gifford
injector.
The valve should be automatic as shown but if desired it can be one which is
operated by hand or by suitable connections with the means for operating the
steam valve so that it will be opened and closed at the right times with relation
to the opening or closing of said steam valve.
Non-lifting injectors in which the water flows to the instrument, are generally
mounted so that the steam valve is at some distance from said instrument.
When the injector is out of action the water is shut off by a lazy cock or suitable
valve in the water supply pipe and the steam valve is closed.
It generally happens that the steam valve does not shut perfectly tight so that
a little steam can leak by it.
The pipe between the valve and the steam chamber as well as the chamber itself,
then becomes filled with steam of a very low tension: When the injector is to be
started again the overflow valve H is opened to allow a temporary outlet to the
atmosphere. Water is then admitted through the supply pipe and flows into the
water chamber up over the top of the combining tube or tubes, through such
tube or tubes and out at the overflow. This water condenses the low tension
steam in the steam chamber and pipe and causes a partial vacuum therein. Then
when the overflow valve H is opened (whether this overflow be located as shown
or at any interval between the combining and delivery tubes), air will rush in to
relieve this vacuum and, in passing through the combining tube or tubes will
prevent or impede the flow of water in the opposite direction through the tubes to
the atmosphere so that the tube or tubes will not be filled with water ready to be
injected when the actuating steam is admitted.
•
It has heretofore been necessary when such failures to operate occurred, on
account of influx of air at the overflow caused by the vacuum, to shut off the water
and steam and begin again.
With my relief valve constructed and applied as described and shown, as soon
as a vacuum begins to form in the steam 'chamber or pipe the outside air lifts the
valve and rushes in to relieve such vacuum, so that the flow of water to the overflow
valve is not interfered with and the injector is ready to be started in action with
certainty at any time.
The vacuum relief valve can be applied as shown to a passage from the steam
chamber or to the steam chamber itself or to the steam pipe entering the steam
chamber

page_text: 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. In combination with an injector a vacuum relief valve applied between the
steam valve and the discharge end of the steam nozzle and adapted to be opened
by the pressure of the atmosphere when the pressure within the steam pipe or
chamber falls below that of the air without substantially as and for the purpose
described.
2. In combination with an injector an automatic valve adapted to remain
normally closed against the egress of air or steam from the steam chamber or pipe
and to be opened by the pressure of the atmosphere to admit air from without
into said chamber or pipe when a vacuum occurs therein substantially as and for
the
purpose set forth.
3. In combination with the injector and the passage opening into the steam
chamber or pipe between the steam valve and nozzle, the automatic valve situated
in such passage and adapted to normally close it against pressure from within and
to be opened by the pressure of the air without to admit air to the chamber or
pipe when a vacuum occurs therein substantially as and for the purpose set forth.
4. In combination with the passage extending from the steam chamber and the
passage intersecting the outer end of said passage and closed at its upper end with
a suitable recessed plug or cap, the puppet valve closing the opening into the lower
end of the intersecting passage and having its stem fitting in and guided by said
lower end of the passage and the recess in the plug or cap, but so formed as not to
close them substantially as and for the purpose set forth.
Dated the Seventh day of April 1884