Improved Ball-valve for Preventing Back Draught of Air into Empty Pipes.
Year: 1896

page_text: Date of Application, 11th May, 1896
Complete Specification Left, 11th Feb., 1897-Accepted, 10th Apr., 1897
PROVISIONAL SPECIFICATION.
Improved Ball-valve for Preventing Back Draught of Air into
Empty Pipes.
We ROBERT HARDING and GEORGE HARDING trading as R. Harding & Son of
75 Arolene Road Brixton London Sanitary and Hydraulic Engineers, etc., do
hereby declare the nature of this invention to be as follows:-
The object of this ball-valve is to prevent any air entering into pipes, should they
become empty through water being shut off.
To attain this object these ball-valves are made in two forms.
One having a straight water way with bevel orifice the bottom protruding at an
angle of 60 deg. with loose hinged flap valve dropping on, unattached to ball stem,
so that ball can drop without opening valve, the valve opens to deliver water, and
closes to prevent air going back in pipe.
The other form having water way directed upward with horizontal seating, on
which drop valve falls, having short tube to conduct water down, this also opens to
deliver water and drops to prevent air going back into pipe, both being kept closed
when cistern is full by the extreme point of ball stem.
1
C
1000
ROBERT HARDING.
GEORGE HARDING.
COMPLETE SPECIFICATION.
Improved Ball-valve for Preventing Back Draught of Air into
Empty Pipes.
We ROBERT HARDING and GEORGE HARDING trading as R. Harding & Son,
Sanitary and Hydraulic Engineers, etc., of 75 Arodene Road Brixton S. W. 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 :-
Our invention of improved ball valve has for its object the preventing of the
entrance of any air into the pipes through the said ball valve at the time of the
pipes being emptied, thus necessitating all air that may be required to enter for
the purpose of drawing water or empting pipes, to enter by a way provided for that
purpose.
The said ball valve is made in two forms to attain the same object.
Fig. 1 has its orifice A for the delivery of water protruding upwards with an
horizontal prepared seating, over which is placed a loose unattached cup valve B
botton upwards with indiarubber disc and rim downward to conduct the water
down through the nozzle into the cistern or vessel which it is intended to fill,
when this vessel is full the ball rises in the ordinary way and the end of its lever

page_text: or stem D presses down the brass piston E on to the loose cup valve A, which
with its indiarubber disc sits on the horizontal prepared seating, and thus closes
the valve.
Fig. 2 has a direct horizontal water way with a beveled orifice A protruding at
bottom and receeding at top, on which a loose hinged flap valve with indiarubber
disc drops unattached to ball stem D or piston E.
In the case of either of these ball-valves being fitted to a cistern or vessel of any
kind the vessel will freely fill while water is on and should such vessel be emptied
while water is off, the ball will naturally drop raising the piston E leaving the
unattached valve on its seating, thus preventing the back entrance of air or syphonage
back of water into the main.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1st. A ball-valve having for its object the preventing the return of any air or
water back into main, by means of loose unattached valve in the form of cup or
flap which remains on its seating independant of the action of the ball.
Dated this 11th day of February 1807
ROBERT HARDING,
GEORGE HARDING.