Year: 1886

page_text: I, JOSEPH MOORE, of No. 6 Durham Villas, East End, Finchley, in the County
of Middlesex, Engineer, do hereby declare the nature of this Invention to be as
follows, that is to say :-
My said Invention comprises improvements specially designed for application to
hydraulic pumping apparatus of the kind described in the Specification of Letters
Patent granted to me and numbered 2447 of 1883; but these improvements are
also applicable to various kinds of pumps made for forcing water with considerable
pressure.
My said earlier Specification relates to mine pumps worked by water conveyed
to the pumps through pipes from a pumping engine at the surface. The pumping
engine to be used in carrying out the present Invention is of the rotative kind,.
being made with a flywheel and crank shaft; and the object of my present
improvements is to prevent or considerably diminish certain concussions and strains
due to the variation caused by the crank action in the speeds of the pump pistons
or plungers.
In carrying out my Invention I employ an air vessel, but combine therewith.
certain pistons or valves which prevent the pressure in the air vessel from becoming
lower than a previously determined pressure corresponding to the working pressure
to be imparted to the water by the pumps. This arrangement is adopted in order
that the great variation which would otherwise occur in the air vessel should not
produce strains analogous to those intended to be prevented. In one modification
the bottom of the air vessel is connected to the middle of a horizontal cylinder
having in it two pistons packed with cup leathers and having rods passing out
through stuffing boxes at opposite ends, these rods being, however, only for showing
the movements of the pistons. The ends of the cylinder are connected by pipes
to the opposite ends of the pump barrels, so that the pressure due to the pumping
acts alternately at the opposite ends of the cylinder. The pistons in the cylinder
are provided with buffers of rubber or other suitable material on both sides of
each, the outer buffers acting when the pistons approach the ends of the cylinder
and the inner ones acting when either piston approaches the other one.
piston is however prevented from moving towards the other one so far as to
pass over the middle port communicating with the air vessel by a dummy piston
or distance piece interposed between the pistons. Each end of the cylinder is
Each

page_text: connected to the middle by a pipe or passage in which there is a check valve loaded
with a suitable spring; and the pumping action causes some water to be forced
through one or other of the two check valves so as to make up or maintain a
suitable pressure in the air vessel. At the commencement of each stroke of the
pumps the resistance due to the inertia of the water in the pipes would cause a
great strain but is prevented from doing so by the yielding movement of the piston
at one end of the cylinder which piston in moving forces the water on its inner
side up into the air vessel. During the second half of each stroke an opposite
action takes place owing to the diminishing speed of the pump plunger due to the
crank action, and then the elasticity of the air in the air vessel causes the piston
to return and to force the water on its outer side back into the pipes, the effect
being to diminish the variation in the speed of the water moving in the pipes. The
air vessel is charged up to a suitable pressure according to the work the pumps are
intended to do, and it is only when the pressure due to the pumping action exceeds
that pressure that the piston yields.
In another modification a differential valve is substituted for each piston. This
is a hollow valve made externally with two parts of different diameters and each
part working through a closely fitting ring whilst the part between the rings is
open to the atmosphere. The larger end of the valve is acted on by the pressure
from the pumps and the smaller part by the pressure in the air vessel; and the
larger end is made with a central opening which closes against a fixed seat. When
the pump pressure becomes sufficient it moves the valve from the seat and then the
water passes through the valve into the air vessel. Each valve is by preference
made with a rod passing out through a stuffing box, and an adjustable spring or
weight may be applied to it externally for the purpose of regulating or adjusting
the pressure at which the valve will act.
Dated this nightoonth dore of Wahun 190

page_text: I, JOSEPH MOORE, of No. 6 Durham Villas, East End, Finchley, 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, that is to say :-
My said Invention comprises improvements specially designed for application to
hydraulic pumping apparatus of the kind described in the Specification of Letters
Patent granted to me and numbered 2447 of 1883 but these improvements are also
applicable to various kinds of pumps made for forcing water with considerable
pressure.
My said earlier Specification relates to mine pumps worked by water conveyed
to the pumps through pipes from a pumping engine at the surface. The pumping.
engine to be used in carrying out the present Invention is of the rotative kind,
being made with a flywheel and crank shaft and the object of my present.
improvements is to prevent or considerably diminish certain concussions and strains
due to the variation caused by the crank action in the speeds of the pump pistons :
or plungers.
In carrying out my Invention I employ an air vessel, but combine therewith"
certain pistons plungers or valves which prevent the pressure in the air vessel :
from becoming lower than a previously determined pressure corresponding to the
working pressure to be imparted to the water by the pumps. This arrangement is
adopted in order that the great variation which would otherwise occur in the air
vessel should not produce strain analogous to those intended to prevented.
And in order that my said Invention and the manner of performing the same
may be properly understood I hereunto append three sheets of explanatory
drawings to be hereinafter referred to and showing examples of my improved.
apparatus. In these drawings the same reference numerals are used to mark the
same or like parts wherever they are repeated.
Figure, 1, on sheet, 1, is a plan; figure, 2, a side elevation, figure, 3, a horizontal
section and figures, 4, and, 5, sections of details of one modification of my improved
apparatus.
I employ an air vessel, 8, constructed with two vertical pipes, joined together at.
their lower ends near which is fixed a safety valve, 9, whilst a pressure gauge, 10,
is attached to one of the vertical pipes the other pipe being provided with two try.
cocks, 11, for the purpose of testing, the level of the water in the air vessel, 8..
This vessel, 8, is charged to any predetermined pressure the air being forced up.
through a vertical pipe, 12, to the upper end of which is fixed a branch pipe, 13,
which dips down and is fixed to each of the upper ends of the vertical pipes,-
forming the air vessel, 8. The bottom of the air vessel, 8, is connected to the
middle of a horizontal cylinder, 14, having in it two pistons, 15, packed with
cup leathers, 16, and having rods, 17, passing out through stuffing boxes, 18, at
opposite ends, these rods, 17, being however only for showing the movements of

page_text: the pistons, 15. The ends of the cylinder, 14, are connected by pipes, 19, to the
opposite ends of the pump barrels (not shown) so that the pressure due to the
pumping action acts alternately in the opposite ends of the cylinder, 14. The
pistons, 15, are provided with buffers, 20, 21, of rubber or other suitable material
on both sides of each, the outer buffers, 21, acting when the pistons, 15, approach
the ends of the cylinder, 14, and the inner buffers, 20, acting when either piston, 15,
approaches the other one. Each piston, 15, is prevented from moving towards the
other one so far as to pass over the middle port communicating with the air
vessel, 8, by a dummy piston or distance piece, 22, (Figure 4) interposed between
the pistons, 15. Each end of the cylinder, 14, is connected to the middle by a
pipe, 23, in which there is a check valve, 24, loaded with a spring, 25, (shown in
enlarged section in figure 5) and the pumping action causes some water to be
forced through one or other of the check valves, 24, when it is required to make
up or maintain the proper pressure in the air vessel, 8. At the commencement of
each stroke of the pumps the resistance due to the inertia of the water in the pipes
would cause a great strain but is prevented from doing so by the yielding
movement of the piston, 15, at one end of the cylinder, 14, which piston, 15, in
moving forces the water on its inner side up into the air vessel, 8. During the
second half of each stroke an opposite action takes place owing to the diminishing
speed of the pump plunger due to the crank action, and then the elasticity of the
air in the air vessel, 8, causes the piston, 15, to return and to force the water on its
outer side back into the pipes, the effect being to diminish the variation in the
speed of the water moving in the pipes. The air vessel is charged up to a suitable
pressure according to the work the pumps are intended to do, and it is only when
the pressure due to the pumping action exceeds that pressure that the piston yields.
Figure, 6, on sheet, 2, is a horizontal section showing an arrangement in which
two pairs of cylinders, 14, are used the adjacent ends of each pair of cylinders, 14,
being provided with stuffing boxes, 26, and the movements of the plungers or
rams, 15, which are substituted for the pistons of the first modification, can be
observed between each pair of stuffing boxes, 26. The inner and outer buffers, 20,
21, are placed in the ends of the cylinders, 14, instead of being fixed to the
plungers, 15.
Figure, 7, on sheet, 3, is a vertical section of a modification in which a differ-
ential valve is substituted for each piston, 15.
A vertical casing, 27, at each end has in it a hollow valve, 28, made with two
parts of different diameters each part working through a closely fitting ring, 30,
packed with cup leathers, whilst the part between the rings communicates with the
atmosphere by a small hole, 31. The larger ends of the two valves, 28, are acted
on by the pressure from the opposite ends of the pump barrels through branch
pipes, 32, whilst the smaller part of each valve is acted on by the pressure in the
air vessel. The larger end of each valve, 28, is made with a central opening, 33,
which closes against a fixed seat provided with a facing of rubber, 34, to act as a
buffer; and a rubber buffer, 35, is also fixed to the top or smaller part of the
valve, 28. When the pump pressure becomes sufficient it moves the valve, 28,
from its seat up against the buffer, 35, and the water passes through the valve, 28,
into a horizontal pipe, 36, having a vertical branch, 37, formed in the casing, 27,
which leads to the air vessel. Each valve, 28, has a rod or spindle, 38, fixed to its
upper end which rod passing out through a stuffing box, 39, has jointed to it a
lever, 40, centered on a bracket, 41, at its outer end and having an adjustable
spring, 42, connected to its inner end for the purpose of regulating or adjusting the
pressure at which the valve, 28, will act.
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 combination with a pumping engine.having a crank shaft and arranged
for forcing water through pipes to work pumps in a mine or otherwise at a distancej

page_text: the application of an air vessel connected to a cylinder or cylinders fitted with
pistons or plungers which are arranged to be acted on by the water forced by
the pumping engine the parts being arranged and operating substantially as and
for the purposes hereinbefore described.
2--The combination of parts referred to in the first claim but with differential
valves substituted for the pistons or plungers such differential valves being
constructed, arranged, and operating substantially as herein before described with
reference to figure, 7, of the accompanying drawings.
Dated th
1000