Double Acting Suction and Force Pump.
Year: 1895

page_text: Date of Application, 28th Mar., 1895-Accepted, 24th May, 1895
COMPLETE SPECIFICATION.
A Double Acting Suction and Force Pump.
I, FRIEDRICH BREYER, of 1 Am Hof No. 7 Vienna, Austria, 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:-
This invention has for its object an improved construction of double acting piston
suction and force pump, suitable both for gases and for liquids and semiliquids, and
it relates more particularly to the construction and mode of manufacturing the
valves and their seats, as also to the devices for guiding them and insuring the
perfect closure thereof.
I will describe the invention with reference to the accompanying drawing in
which
Fig. 1 shews a vertical longitudinal section of the pump, Fig. 2 shews a
horizontal section, Fig. 3 a detached vertical cross section of the cylinder and
Fig. 4 a plan.
The pump consists of the cylinder Z and the symetrically arranged parallel
cylindrical valve chambers V V₁ which communicate with each other at both ends
by means of the caps H H. The latter contain the guides for the piston rod, of
which one is a stuffing box guide b, and the other a tubular guide k, closed at the
lower end. The three cylinders Z V V₁ are formed in one casting, which is faced
at each end, for the caps H H¹ to be fixed airtight thereon; the latter consist of
two metal parts hi, h' formed by stamping or pressing in dies. The parts / and h¹
have exactly the same configuration as have also the parts ii, which have openings
corresponding to the openings of the cylinders V Z and V.
The flanged edges or rims of the parts i fit into the openings of Z and V₁ and
constitute respectively stops for limiting the motion of the piston, and seats for the
forcing valves v¹ v¹.
The outer parts hh¹ form closed channels at the ends of the pump; in these parts
are soldered or otherwise fixed the metal stuffing box band the tube k, whereby a
double guide for the piston rod is provided.
The two parts of each cap are united together by soldering or brazing at the
meeting flanges so as to form one piece.
The valve chamber V contains the two suction valves vv and the chamber V1
the two forcing valves v¹ vl.
These valves are made of a bell-shape preferably by stamping in dies out of sheet
metal, and the flanged edge thereof that fits against the valve seat is made with a
spherical seating surface in order to ensure a tight fit while allowing a certain
amount of lateral play of the valve on the seat.
The close seating and correct action of the valves is effected by means of bent
springs, of approximate S shape, F F1 F2, which are made to press with their ball-
shaped ends against the inner apices of the valves.
The springs F F' have their one end fixed in corresponding holes drilled at ff1
into the piston rod guides band k, so that they can be readily and rapidly changed,
when necessary. The spring F2 that acts upon the two forcing valves vis
introduced loose between these and bears with its two ball shaped ends against the
hollow apices thereof.
All the said springs must possess such a degree of elasticity as to allow of the
free working of the valves.

page_text: The stamped cap-parts h h¹, ii, and the valves v v³ can, in consequence of their
mode of manufacture, be readily produced in considerable numbers, with perfectly
identical configuration and dimensions, whereby not only a reliable and accurate
action is insured, but a considerable economy in construction is secured.
The action of the pump is as follows.
At the downstroke of the piston, the liquid entering through branch S into
cylinder V passes in the direction of the arrow Fig. 1 under the raised suction
valve into the upper cap H, while the liquid under the piston in the cylinder Z is
forced through the lower cap H', and on forcing open the lower valve v', flows
through cylinder V₁ to the delivery branch D.
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At the upstroke of the piston the above action is repeated in the reverse direction,
with the other two valves in action.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a double acting suction and force pump, the combination with a pump
cylinder Z of two cylindrical valve chambers V V₁ containing valves which
are pressed against their seats by means of bent springs F F F" having ball-
shaped ends that bear against hollows of the said valves, substantially as
described.
2. Constructing the valves vv referred to in the first claim of a bell shape
with a flanged edge having a spherical surface constituting the seating surface
of the valve, said valves being stamped in dies out of sheet metal, substantially as
described.
3. In a pump constructed as set forth in the first claim, the connection of the
cylinder Z with the valve chambers V and V₁ at their two ends by means of caps H
and H formed by stamping in dies, and composed each of two parts h, i, and h¹, i³,
of which the inner portions and are formed with rims or flanges that act
respectively as stops to the pump piston and as seats for the forcing valves v¹, while
the outer parts and which are secured to the inner parts, serve to close the
ends of the pump, substantially as described.
Dated this 28th day of March 1895.
ABEL & IMRAY,
Agents for the Applicant.