Improvements in Steam and Vacuum Pumps for Raising Liquids.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in Steam and Vacuum Pumps for Raising Liquids.
I, OTTOCAR LINDEMANN Engineer, 86 Queen Street Cheapside London E.C.
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 improvement consists in the construction of an arrangement which cuts off
the injection used for condensing the steam in the pump-chambers after the contents
have been forced into the delivery pipe of the pump; the cutting off of the injection
to either one or other chamber taking place immediately after the distributing
steam valve has been drawn over to that chamber.
It is thus made possible to save steam without loss of water, by using a powerful
injection, causing rapid condensation and ready movement of the steam valve, and
cutting off the supply of steam to either chamber immediately after they are
emptied.
To secure this, I place in the injection supply an alternating double seat valve
(flap, piston-slide, disc, ball etc.) in such way that according to the position of the
valve the injection supply is open only to one chamber, the connection to the other
chamber being shut off by the valve.
The injection supply may be taken from the delivery pipe, from an air vessel or
from both simultaneously.
The accompanying drawings show several of the arrangements that may be
adopted for the double-seat valve in the injection supply.
Fig. 1. shows a double chamber pump in which a disc valve is used, to alternately
disconnect the chambers from which the injection supply is taken, and the volume
of water in the delivery pipe of the pump.
a,
a' are the two working chambers of the pump, b, b¹ the suction valves, c, c¹ the
delivery valves, d the suction pipe, e the delivery pipe, is the alternating disc-
valve which moves between the seats g, g', and cuts off the pressure water in the
delivery pipe alternately from the two spaces contained between the valve-seats g, g²,
and the delivery valves c, c', to which spaces the injection supply h,h' are connected.
The working of the arrangement is as follows.
Steam being admitted into chamber a, the contents are forced into the delivery
pipe. The flow of the water from this chamber presses the disc-valve f, against the
seat g', and so disconnects the pressure water in the delivery pipe from the injec-
tion. So soon as the chamber a is emptied, the injection comes into action,
creating a vacuum, and drawing over the steam-valve. This movement of the
steam-valve admits steam into chamber a', from which the contents are in turn
ejected, causing the disc-valvef to move against the seat g, and cut off the injection
supply from the injection h.
Thus the object sought, viz. to prevent further injecting of water after the steam-
valve is drawn over, is completely secured.
Fig. 2. of the accompanying drawings shows a double chamber pump, in which
the injection supply-pipes 9 and 9', and the connection of these to the delivery
pipe, e, are arranged on the outside of the pump. A ball-valve f is placed at the
branching off of the two injection supplies. The same letters denote the same parts
as in Fig. 1. The action of this arrangement is practically the same as that of the
arrangement shown in Fig. 1., but in this case the valve fonly cuts off the pressure
water in the delivery pipe from the two injection supplies alternately, and not
also, as in Fig. 1., from the delivery valves c c².
Fig. 3 shows a double chamber pump in which the injection supply is not taken
from the delivery pipe of the pump, but from a special air vessel i, into which the

page_text: water is forced through the injection pipes 9 and g³ during the emptying of the
chambers.
The alternating valve for the injection supplies is shown as a balanced clapper-
valve f. The action is the same as that explained in relation to Fig. 1.
To assist the starting of the pump it is advisable to connect the delivery pipe and
the injection air vessel i by a pipe o. This pipe may have a check-valve which
opens towards the injection side.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
1. In connection with double chamber vacuum pumps an automatic alternating
valve, in the injection supply, by which the injection is cut off automatically in
either chamber simultaneously with the movement of the steam valve, and the change
of pressure from one chamber of the pump to the other.
2. In connection with the injection supply for both chambers of double chamber
vacuum pumps a common air vessel and a double seated valve shutting off the con-
tents of the airvessel alternately from the injection of the one or the other
chamber.
3. The combination with the arrangement described in Clause 2 of a connection
between the injection air vessel and the contents of the delivery pipe of the
pump.
Dated this 7th day of September 1891.