Year: 1886

page_text: Date of Application, 17th Sept., 1886.
Complete Left, 17th June, 1887.
Complete Accepted, 22nd July, 1887.
I, GUSTAV SCHNASS, Civil Engineer of Düsseldorf, Germany, do hereby declare
the nature of this invention to be as follows :-
The present invention relates to a new kind of pump specially adapted for lifting
mixtures of air and water, and with a simple modification, as a feed pump for steam
boilers.
As illustrated by the annexed drawings, the mixture of water and air arrives
through a lateral opening of the vertical pump barrel and fills the space above the
piston. As soon as the latter has reached a certain height, it closes the inlet and
commences to lift the water and the air situated above the water, so that the fluid
opens the discharge valve.
If it is desired to discharge the air into the atmosphere, while the water is forced
into the boiler, I employ a double seated air valve which allows the air to escape. As
soon as this valve comes in contact with water, it acts as a piston and closes the upper
valve seat.
To prevent air from penetrating into the interior of the pump while the two valve
seats are simultaneously open, a check valve is applied above the double valve.
The piston is kept tight by the water lying above it. Any small quantity of water
that may pass down through leakage is conducted to the inlet side by a small pipe.
In the drawings A is the pump barrel, B the piston, the inlet pipe for water and
air, D the discharge valve, E the double seated air valve, F the check valve and H
the pipe for returning into the inlet C any water that may have leaked down to the
bottom of the barrel.
Dated this 17th day of Santambon 1000
FAIRFAX & WETTER,
433, Strand, London,
Agents for the Applicant.

page_text: improvements in Pumps, Chiefly Applicable to the Air and Feed
Pumps of Condensing Steam Engines.
I, GUSTAV SCHNASS, Civil Engineer, of Düsseldorf, Germany, do hereby declare
the nature of my invention for IMPROVEMENTS IN PUMPS, CHIEFLY APPLICABLE TO
THE AIR AND FEED PUMPS OF CONDENSING STEAM-ENGINES, and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
The present invention relates to a new kind of pump specially adapted for lifting
mixtures of air and water and, with a simple modification, as a feed pump for steam
boilers.
As illustrated by the drawings filed with the provisional specification, the mixture
of water and air arises through a lateral opening of the vertical pump-barrel and fills
the space above the piston. As soon as the latter has reached a certain height, it
closes the inlet and commences to lift the water, and the air situated above the water,
so that the fluid opens the discharge valve.
If it is desired to discharge the air into the atmosphere, while the water is pressed
into the boiler, I employ a double seated air-valve which allows the air to escape. As
soon as the water presses against the bottom of the valve, the valve rises from its
lower seat.
To prevent air from penetrating into the interior of the pump, while the two valve
seats are simultaneously open, a check valve is applied above the double-valve.
Any small quantity of water, that may pass down through leakage, is conducted to
the inlet side by a thin pipe.
In the drawings, A is the pump-barrel, B the piston, C the inlet pipe for water and
air, D the discharge-valve, E the double-seated air-valve, having a cylindrical body
and conical ends, F the check valve and H the pipe for returning into the inlet C any
water, that may have leaked down to the bottom of the barrel.
It will be seen from the drawings, that the inlet and outlet for the mixture of water
and air or other gas, and the shape and length of the piston are so arranged or chosen,
that during the discharge period, the piston cuts off the communication between the
barrel and the inlet or suction pipe, thus performing the function of a suction valve.
With this object in view, the inlet is preferably situated near the middle of the
length of the pump barrel, while the outlet is at the upper end, the inlet opening of
the pump-barrel is inclined downward, and the piston has a long cylindrical body
with a concave upper face.
Pumps provided with an air valve having two alternate valve seats, and with a
check valve, as described, may be employed for feeding a steam boiler with warm
water taken from the condenser. In this case the inlet pipe is connected with the
condenser so that the mixture of water and air flows into the pump, and the discharge
pipe is connected with the boiler.

page_text: The piston rod may be made to pass either through the upper or through the lower
end of the pump barrel, without departing from my invention, and instead of
conducting the leakage water from the bottom of the barrel into the inlet pipe by a
special return pipe, as shown, a vertical groove may be formed in the inner surface of
the pump barrel, said groove extending from the bottom of the barrel to the level of
the water inlet or above the same, so that leakage water may be forced from the
bottom to the upper part of the barrel by the pressure of the piston.
The air valve and check valve may also be applied to pumps provided with suction
valves, and the passage or canal containing the said air and check valve need not
form a branch of the discharge pipe, but may be connected direct with the side of the
pump barrel, so as to be separate from the discharge pipe and independent of
the same.
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 pumps for lifting or forcing mixtures of liquids and gases, a pump barrel and
a piston constructed and arranged, substantially as described, so that the piston acts as
a suction valve by closing the inlet to the pump barrel during the discharge period.
2. In a pump adapted, in the manner substantially as described, to operate without
suction valve, an auxiliary duct serving to establish communication between the
bottom of the barrel and the inlet pipe or the upper part of the barrel for the purpose
of returning any water, that may have leaked below the piston.
3. In a pump for lifting or forcing mixtures of liquid and gaseous bodies, an
appliance for discharging air, constructed and adapted to operate substantially as
described and illustrated.
4. In a pump for raising or forcing mixtures of liquids and gases, the combination
of a double-seated air valve, with a check valve and valve casing, the whole being
adapted to operate substantially as described.
a
5. pump for lifting or forcing mixtures of liquid and gaseous bodies, having
piston adapted to act as a suction valve, a double-seated air valve and a check valve,
and an auxiliary passage for returning leakage water, the whole substantially as
described and illustrated.
Dated this 16th day of June 1887
FAIRFAX & WETTER,
433, Strand, London,
Agents for the Applicant.