Improved Air Extractor or Relief Valve Apparatus for Separating Air from Heated Water.
Year: 1898

page_text: PROVISIONAL SPECIFICATION,
Improved Air Extractor or Relief Valve Apparatus for Separating
Air from Heated Water.
I, ROBERT COCKBURN, of Cumbrae House, Dumbreck, in the City of Glasgow,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object to provide a simple and improved device for
separating air from heated water and applicable in connection with feed water
heaters, steam-traps and like apparatus in which water is collected and it is desir-
able that the air should be extracted therefrom.
The improved device comprises a casing of cylindrical or other form the lower
end of which is connected to and communicates with the feed water heater, steam
trap or other vessel containing water from which the air is to be extracted.
Within the casing is fitted a bell float open at its lower end and suspended at its
upper closed end from the end of a lever centred on a pivot in the casing and to
whose other end is attached a valve seated in an outlet orifice near the upper end
of the casing.
In the operation of the device the water rising in the casing raises the bell
float and through the lever acts on the valve to hold it close on its seat so that
the water may not escape. Upon the accumulation of air within the casing the
water level becomes lowered, the float sinks and through the lever lifts the air
relief valve from its seat whereupon the air escapes and the water again rising
acts on the float to close the valve.
Improved Air Extractor or Relief Valve Apparatus for Separating
Air from Heated Water.
I, ROBERT COCKBURN, of Cumbrae House, Dumbreck, in the City of Glasgow,
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 to provide a simple and improved device for
separating air from heated water and applicable in connection with feed water

page_text: heaters, steam traps and like apparatus in which water is collected and it is desir-
able that the air should be extracted therefrom.
The invention is illustrated, under two modifications, by the accompanying
drawings, Fig. 1 being a vertical section of the apparatus as applied to a line of
piping, and Fig. 2 a like view showing the apparatus in the form adapted for
connection to a feed water heater.
The improved device comprises a casing A of cylindrical or other form the
lower end of which is connected to and communicates with the feed water heater,
steam trap or other vessel containing water from which the air is to be extracted.
When the device is intended to be connected to a feed water heater, it is formed
at its lower end as shown at Fig. 2, but when applied to a line of piping the lower
end of the apparatus is formed as shown at Fig. 1. Within the casing A is fitted
a bell float B open at its lower end and suspended at its upper closed end from the
end of a lever C centred on a pivot D in the casing A and to whose other end is
attached a valve E so constructed that the air escapes downwards past the sides
of the valve, the valve being seated in an outlet orifice F near the upper end of
the casing A, and adapted on the float rising to close down upon said seat F, and
prevent the escape of water.
In the operation of the device the water rising in the casing raises the bell
float and through the lever C acts on the valve E to hold it close on its seat F
so that the water may not escape. Upon the accumulation of air within the
casing A the water level becomes lowered, the float B sinks and through the
lever Clifts the air relief valve E from its seat F whereupon the air escapes and
the water again rising acts on the float B to close the valve E.
A grid G is provided near the bottom of the casing A, which has the effect of
breaking up the inflowing water and so causing it to part with its air.
A hand wheel I on a screwed spindle H engaging the beam lever C on the float
side, may be provided for closing down the valve E by hand upon its seat F to
prevent the escape of air, and for opening it to permit the air to escape.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to he performed, I declare that what
I claim is —
The improved air extractor or relief valve apparatus for separating air from
heated water, consisting of a casing in which a float is suspended at one end of a
beam lever, the other end of the lever being attached to a valve so constructed as
to allow the air separated from the water to escape, and to close on the rising of
the float to prevent the outflow of water substantially as described.
D
1
00:2 1
1000
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62, Saint Vincent Street, Glasgow,
Agent for the Applicant.