An Improved Double Acting Steam Feed-pump.
Year: 1894

page_text: Date of Application, 4th Oct., 1894-Accented, 18th Feb., 1895
COMPLETE SPECIFICATION.
An Improved Double Acting Steam Feed-pump.
I, LEON DEPREZ, of 119 Chaussée de Diest, of Kessel, Loo-lez-Louvain in
the Kingdom of Belgium 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
1
This invention has for object the construction of a double acting feeding
apparatus which will operate at all temperatures.
In the accompanying drawing,
Fig 1 represents a longitudinal section on the lime M N of the plan.
Fig 2 is a plan view of the apparatus.
Fig. 3 shows a front elevation of the steam cylinder on the line A B of Fig. 1.
Fig. 4 shows a transverse section of the cylinder or pump body on the
lines C D, E F of Fig. 1.
Fig. 5 shows a plan view of the cover plate T.
Fig 6 is an end sectional elevation of the cover plate T of the large cylinder M
and its slide valve S.
The apparatus shown in the drawing will give 3,000 litres per hour for an
ordinary speed of about 10 metres per min., but it should be understood that the
apparatus may be constructed of all sizes.
A is the inlet pipe though which the steam from the boiler passes into the
orifices B, B'.
B, B', are orifices allowing the steam to pass into the chamber C.
C is a small chamber in which slides a small piston D.
Dis a small piston in the chamber into which the steam first passes and which
regulates the steam as required
E, is the rod of the small pistou D.
F 18 a passage giving access to the steam from the orifices B, B', passing from
the chamber Cin order to dnect it along the passage G.
Gis a passage directing the steam into the orifice II.
H 18 an orifice delivering the stenm into the chamber I.
I is a chamber in which slides the piston K.
K, K', are pistons forming a piston valve in the chambers I and R into which
the steam passes in its passage through the apparatus, and from which the steam
passes into the passages or ports L, L'.
L, L', are steam ports or passages leading to the large cylinder M in which
slides the piston N.
M is the cylinder containing the piston N.
N is the large piston.
O, is the piston rod connecting the pistons N, 1.
P is a passage giving access to the steam from the orifices B, B', to move the
piston K to the left when the small pistou D is at Q.
R is a chamber in which slides the piston K'
S, is the exhaust for discharging the steam into a reservoir where it can heat
the feed water or elsewhere
T, is the principal cover plate.
U is the outer cover plate.
V is a stuffing box.
1

page_text: •
The steam enters through the inlet A, passes along the passages B B' into the
chamber C continues its way through the passage G, passes up the passage H and
enters the chamber I and then continues its way through the passage L into the
large cylinder M and presses against the piston N and thus gives it its stroke to
the night.
The piston N before reaching the end of its stroke abuts against the rod E of
the piston D and causes the latter to take the position at the end of the
chamber C and by this means shuts off the supply of steam to the passage G
without stopping the steam from entering the chamber C and from passing through
the passage P to act on the piston K and drive it to the left, and open the
passage which allows the steam to enter the large cylinder M and act on the
piston N to give it the stroke to the left.
Then the small piston D recovers its first position by means of the piston 1,
which strikes the rod E at r.
In this manuer the passages F and G will receive the steam, and the stroke to
the right is repeated.
PUMP CYLINDER OR BARREL.
The inlet pipe a, the slide c, being in the position shewn in Fig. 1 and the
pistons N and 1, taking their course to the right as indicated by the description of
the steam cylinder, it follows that the water is drawn through the pipe a, passes
through the port r, formed in the slide valve c and continues through the passage g,
and enters the pump barrel, whilst the outflow escapes by the passage k, through
the ports, of the slide valve c and passing through the valve chamber flows out
through the delivery pipe and is thus conducted to the boiler or any other
receiver.
When the piston N of the steam cylinder has struck the 1od E of the piston D
which causes the steam to act upon the piston K' and itself moves towards the
left baud and thus the slide valve which is on the rod e, must move in the same

page_text: direction, and the orifice K which was the port of outflow becomes that of intake
and the orifice g, which was the intake becomes the port of outflow. This occurs
alternately at every change of stroke.
In place of the double ported slide valve c as shown an ordinary single slide
valve may be employed.
Then the intake would occur at the outflow passage 1, and the outflow would
occur at the inlet passage a.
There may also be two pistons in place of the slide valve as in the steam cylinder
and both upon the same rod as in that case.
The principal advantages of the apparatus are as follows
-
1. By the use of slide valves which are substituted in this invention for the
ordinary valve each inspiration is made instantaneously and at any temperature.
2. The feed water has the very high temperature of 100° and above and this 1-
a great economy in feeding steam boilers or in warming trains.
3. By reason of its simplicity and strength the apparatus can be managed by
any ordinary mechanic.
4. Its action is extremely simple the operator merely has to open the inlet of the
steam boiler and the apparatus performs its work
5. The defective action of clack valves is impossible as there are none employed.
6. The impurity of the water cannot interfere with the steady working of the
apparatus, and thus a constant action is ensured.
A
Having now particularly described and ascertained the nature of my said inven-
tion and in what manue the same is to be performed I declare that what I
claim is
-
A double acting feeding apparatus in which the usual clack valves are replaced
by a slide valve and the intake occurs instantaneously and at any temperature as
herein described and set forth.
Dated this 4th day of October 1894
S. S. BROMHEAD,
97, Newgate Street, Londou, E.C., Agent for Applicant.