Year: 1886

page_text: I, GEORGE FREDERICK REDFERN, of the General Patent Office, No 4 South
Street, Finsbury, in the county of Middlesex, Patent Agent do hereby declare the
nature of this invention (a communication from abroad by Gustaf Richert, of
Gothenburg, in the kingdom of Sweden, Engineer) and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement :-
This invention relates to further improvements in " 'Universal water waste
preventors" used with automatic cocks for preventing hydraulic concussion in
water pipes for which Letters Patent were granted to ine N° 11610 dated the
29th September 1885.
In order to enable the invention to be fully understood I will proceed to describe
the same by reference to the accompanying drawing in which figure 1, is a vertical
section of the improved apparatus and tigure 2, is a side view of the same.
A, is a chamber into which an outlet pipe B, and an inlet pipe C, are screwed,
the pipe C enters a short distance into the pipe B, which has a greater diameter,
whereby both pipes will during the passage of the water, act as an ejector as in the
specification of the said former Letters Patent. The apparatus is divided into two
parts, an upper compartment L, to serve as an air chamber and a lower compart-
ment D, which communicates by means of small openings E, with the upper
compartment L. In the compartment D, is the ball F, over an opening G, in the
seating H. I is a screw cap having an opening K, for the passage of atmospheric
air into the compartment D.
The apparatus is applied to the water pipe immediately in front of an automatic
cock so that the water when the cock is open flows through the apparatus in the
direction shewn by the arrows.
When the cock is closed the water fills the compartment D, and it is prevented
escaping through the opening G by the ball F, the water also partly fills the air
chamber L, so that the air contained therein is thereby compressed.

page_text: "
When the cock is opened water passes in through the inlet pipe C and out
through the outlet pipe B; the water is to a great extent sucked out of the com-
partment D, through the openings E, and the water level in the air chamber
gradually falls. Owing to the vacuum thus produced the ball F, is raised and air
enters through the opening K. When the cock is closed the ball F, falls to its seat
and the water compresses the air contained in the apparatus whereby the shock of
the water in the pipes is balanced.
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:-
The improved apparatus herein described for preventing concussion in water
pipes such apparatus consisting of a chamber divided into two compartments L,
and D, arranged one above another the upper one, which serves as an air chamber,
being provided with two pipes arranged to operate as an ejector, the said com-
partment communicating by means of small openings with the lower compartment
which is provided with an opening for communicating with the atmosphere, the
said opening being provided with a ball valve all substantially as herein before
described and illustrated in the accompanying drawing.