INPROVEMENTS IN APPARATI FOR RAISING AND INJECTING WATER AND FOR FREDING BOILERS
Year: 1869

page_text: PROVISIONAL SPECIFICATION left by Henry Davey at the Office of
the Commissioners of Patents, with his Petition, on the 7th January
1869.
I, HENRY DAVEY, of 20, John Street, Adelphi, in the County of
Middlesex, Engineer, do hereby declare the nature of the said Invention
for "INPROVEMENTS IN APPARATI FOR RAISING AND INJECTING WATER AND FOR
FREDING BOILERS," to be as follows:-
This Invention consists, first, in an improved apparatus by which
water is raised to and injected into steam boilers and other vessels,
which apparatus may be made to measure the water injected and to
preserve the level of the water in the boiler or vessel from varying
beyond narrow limits.
Second. In improved means of actuating the steam admission and
emission valves of steam pumps.
In carying out the first part of this Invention I employ a vessel with
two communications to the boiler, one for the supply of steam from the
boiler to the apparatus and the other for the supply of water from the
vessel to the boiler, having also another communication with a tank or

page_text: other source of supply for the water to be injected, with valves to open
and close the said communications, actuated, as herein-after described,
in such a manner that when the two communications to the boiler are
closed the one from the supply source shall be open, and vice versa.
That my Invention may be clearly defined I have prepared three
Sheets of Drawings hereunto annexed, the same letters of reference
indicating corresponding parts throughout corresponding Figures.
Figures 1, 2, and 3, Sheet 1; Figures 4, 5, and 6, Sheet 2; and
Figure 7, Sheet 3, are sections of apparati such as I employ in carying
out the first part of this Invention.
In reference to Figures 1, 2, and 3, Sheet 1, a is the said vessel;
b, c, d, e, and fare pistons. The piston 6 is exposed constantly or inter-
mittingly to the pressure of the steam; the piston is constantly
exposed to the pressure in the vessel a when the valve g is open; the
piston e is constantly exposed to the pressure in the feed pipe; the
piston is exposed alternately to the pressure of the steam and the
atmospheric pressure or the pressure in the vessel L. As the pistons d, e,
and move up and down they actuate a valve which is caused to open
the vessel a alternately to the steam and to the exhaust pipe p. During
the down stroke of the said pistons steam is admitted to the vessel a,
and displaces the water which the said vessel may contain, the water
passing off through the valve i to the boiler. During the up stroke of
the said pistons the steam previously admitted to the vessel a is
exhausted through the pipe p to the vessel L, where the said steam may
be condensed or allowed to pass off through the valve N. The vessel L
communicates with the supply water pipe through the valve O, and with
the vessel a through the valve M. If cold water is being injected to the
boiler the steam passing off through the pipe p will be condensed; if,
however, the boiler is being fed with water too hot to condense the
steam then the vessel L may be placed at a higher level than the
vessel a, so that the water may gravitate to the vessel a when the steam
is exhausted from the vessel a. The pistons b, c, d, c, and fare actuated
in the manner herein-after described. Steam above the piston 6 first
forces it and the piston c to the bottom of their stroke, and admits steam
above the piston f, which is thus caused to descend untill the valve t
admits steam to the vessel a, thus putting a pressure on the piston c
which causes it to travel in the opposite direction untill the valve allows
the steam above the piston f to escape, when the constant pressure on

page_text: the piston o causes it to ascend untill the valve allows the steam con-
tained in the vessel a to escape through the pipe p. In lieu of the
pistons d, e, and f, in Figures 1, 2, Sheet 1, I employ, as shown in
Figure 4, Sheet.2, a lover with an elastic or rigid connection with
the valvo spindle of the valvot, the said lever being made to actuate tho
said valves by means of the pistons b and c; or in lieu of the last
described arrangement I employ that shown in Figuro 7, Sheet 3. The
pistons b, c, are caused to actuate the valves y and by means of the
lever, which is either rigid or elastic as preferred. The valve y is the
admission and the valves the emission valve. That the water in the
boiler may be preserved at a level but little varying from a fixed point I
employ in the vessel a a float h, which is made to give motion to a
valve by means of suitable connections. The valve g is made to closo
the communication between the vessel a and the piston o by means of
the float as it rises, thus stopping the action of the apparatus untill the
water shall have fallen in the vessel a, so as to allow the float to open
the valve g, and thereby cause the apparatus to resume its action. That
the required level of the water in the boiler may be more effectually
maintained I place the end of the steam pipe which supplies the appa-
ratus to the required level of the water in the boiler; and to prevent
spray from being carried over into the vessel a with the steam, before
the water rises to as to cover the end of the pipo a, on Sheet 3, Figure 8,
I place over and enclosing the end of the steam pipe another larger
pipe b, open at the top, which is carried into the steam space of the
boiler, but with only a small opening in the bottom. The object of
this pipo is to preserve the water within it in a state of rest and freo
from motion from ebulation. When the water in the boiler rises so as to
cover the end of the pipe a the water passes into the vessel a and keeps
the float & suspended, and the valve shut untill the water falls in the
boiler, so as to admit steam through the pipe a. I measure the water
passed through the vessel a by means of a counter, which registers the
number of strokes made by the pistons b, c. The counter consists of a
number of disks of different diamiters placed one on the other, cach disk
divided into ten divisions, which are numbered, so that the numbers
marked on each disk may appear in the order as follows:-The largest
disk to have figures representing units, the next size being tens, and the
next hundreds, and so on to the smallest. The large disk is made to
completo one revolution to ten strokes of the pistons; the next sizo disk
makes one revolution to ten of the large disk, and so on, the disks

page_text: actuating cach other by means of rachets. By this means the full
number registered is seen at a glance, the figures being always in the
proper order. The above described counter may be also applied to other
purposes, such as counting the strokes of an engine, &c.
In carrying out the second part of this Invention I make the admission 5
and emission valves of steam pumps to be partially self-opening and
closing, in the manner herein-after described.
Figure 9, Sheet 3, represents a section of piston valves, and Figure 10
a section of a slide valve chest constructed according to my Invention.
In Figure 9, ƒ and g are pistons; c and d are steam ports to the 1
ends of the cylinder; e is the steam supply port; h is the exhaust
pipe. If the pistons ƒ and g be moved either way so as to uncover the
ports c or d, then the pressure of the exhaust steam from either of the
ports c or d will cause the valves to move further in the same direction
by imposing a pressure on either side of the pistons for g. In Figure 10, 1
Sheet 3, is a steam piston, n and o ports to the sides of the said
piston. The lever L is actuated by means of an attachment at m. An
ordinary D slide valve covers the ports N and O, and as it is moved by
means of the lever L, admitting steam alternately to the sides of the
piston i, thus causing the said piston to move the said slide valve further 2
in the same direction, the end of the lever M then becoming a fulcrum.
Now having described the nature of my Invention, and the manner
in which the same may be carried out, I would observe that what I
consider to be novel and original and therefore claim,-
First. The construction of and combination of parts in such apparati 2
for raising water and feeding boilers, as herein-before described and
illustrated.
Second. The construction of a counter, as herein-before described.
Third. The means of actuating the valves of steam pumps, as herein.
before described and illustrated.
3