Automatic Water Pressure Sewage Pump.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Automatic Water Pressure Sewage Pump.
I, HENRY DAVEY, of 3 Princes' Street, Westminster, in the County of Middlesex,
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 :-
My invention consists in an improved water pressure pump to be worked from any
convenient source of water supply, and applied to the purpose of raising sewage,
automatically varying its speed of action to suit the varying flow of sewage in the
sewers.
Fig. 1 shows a section of the pump; Figs. 2 and 3 sections of the power valve
box, and Fig. 4 a section of the apparatus for producing the automatic action of the
pump. A is the power cylinder, having a piston B and rod C, the annular space in
front of the piston being kept, during the working of the engine, in communication
with the supply pipe; D is the supply valve closing on the inner beat of the cylinder E,
forming the exhaust valve; F is the passage to the cylinder A, and G the supply pipe.
H is the exhaust pipe. I is a throttle valve connected by a system of levers to the
float K. M is a small D slide valve controlling the passages N and N, leading to and
from the cylinder O, containing a piston P. attached to the supply valve D; the supply
to the valve chest containing the slide valve M is through the port R. The slide
valve M is worked by a tappit rod S from the piston rod of the engine. To cause the
engine to pause slightly at the end of the stroke and thereby give time for the pump
valves to close without shock, I make a projection Z between the valve beats of the
annular valve E; by this device the supply water is almost cut-off before the valve D
actually closes and the exhaust is not opened suddenly after the supply is closed. The
effect is a gradual reversal of the stroke giving time for the pump valves to fall to
their seats by their own gravity before the stroke is reversed.
The pump consists of an open cylinder having a piston P, a suction valve U, and a
delivery valve V. The peculiar arrangement of the piston and suction valve is such,
that any solid and heavy matter passing through the suction valve is directed into the
pipe W, and not into the pump barrel. It is evident that although the pump and
engine are shown horizontal they may be placed vertical without altering the effect.
The sewage to be pumped is let into the vessel X, through the pipe A'; the vessel has
two compartments, B₁ and C1, communicating with the suction pipe of the pump
through the hole D¹. When the two pumps are placed together the vessel is doubled
as shown in Fig. 4, having a communication E¹. The float. K is lifted by the
sewage entering the vessel ✗, and opening thereby the vale I, thereby putting
the pump to work. If the pump pumps faster than the sewage flows, then the
float K falls and throttles the supply of water to the engine, at the same time throttling
the sewage entering the suction pipe through the hole D¹, thereby putting a resistance
on the suction of the pump.
Should the sewage flow faster than the first pump can take it, then it rises so high
as to flow into the other vessel, thereby lifting the float K', and starting the second
engine.
Having now described my invention, and the manner in which it may be carried
out, what I claim is :-
:-
1st. An automatic sewage pump, consisting of a hydraulic cylinder actuating an
open top pump, controlled by means of a throttle valve, actuated by means of a
float, substantially as described and illustrated.
2nd. Providing a closed chamber in which the float is made to throttle the suction
of the pump, substantially as described and illustrated.

page_text: 3rd. The employment of a second float chamber attached to the first with a com-
munication, so that a second pump may be controlled by a float in the said chamber
when the first pump has failed to pump the whole of the sewage flowing into the
first chamber, substantially as described and illustrated.
4th. Making a projection Z on the annular valve E whereby the stroke is reversed
without shock substantially as described and illustrated.
Dated this 6th day of September 1889.
HENRY DAVEY.