Year: 1887

page_text: I AARON BRADSHAW Engineer and Brass Founder, Griffin Works Willows
Lane, Accrington Lancashire, do hereby declare the nature of this invention to be
as follows:
These improvements are intended to remove certain defects found in check or back
pressure valves as they are now constructed viz-To so construct such valves that the
inoving clacks or clappers shall offer the least resistance to the flow of the liquid or
fluid passing through the valve and shall not "stick" or "hold" on the bodys of
the valves when such clacks or clappers should freely close against the valve seating.
When the clacks or clappers of such valves "stick "hold" and do not go freely
to their seating the liquid or fluid such valves should prevent from reflowing is not
so prevented and often serious damage is caused through such "sticking."
"
ог
And to so construct the said valves that the clacks or clappers may be ground to
their seatings or that new clacks or clappers may be fitted to the bodys of said valves
without removing the said valves from the pipes to which they are applied.
Check or Back pressure valves as constructed under these improvements are as
follows viz-I form the inlet and outlet branches of these valves as is usual with
ordinary stop valves and I form the seatings in the said valve bodys at a suitable angle
to the said inlet and outlet branches the most suitable angle for general purposes
is 45° forty five degrees from the line of pipe to which the valve is fixed but this
angle I modify to suit special circumstances underneath and at a suitable distance
from the aforesaid seating I form a bearer or support said bearer or support I cast
in one piece with body of each valve so that a pivot in the centre and on the lower
side of moving clack or clapper may move easily in a hole bored into the said bearing
or support the aforesaid hole being bored true with the inside diameter of the said
seating on the upperside of the said clack or clapper I also form a pivot and on this
pivot I form a shoulder the said shoulder acting as a guard to prevent the said clack
or clapper lifting to high from the seating of valve. The pivot on upperside of clack

page_text: or clapper I cause to pass through a guide peice the said guide peice being screwed
inside a boss formed over the seating in the body of valve a hole is bored through the
centre of the said guide peice true with the hole in seating of valve. To put the clack
aforesaid into the valve and in proper working position it is necessary to take the
guide peice out of valve body and when the said clack or clapper is in position tho
aforesaid guide peice may be screwed into the aforesaid boss in body of valve the hole
in contre of guide peice allowing the pivot on the upperside of the said clack to enter
into it thus the said clack as it rises and falls from or to the said scating is held
perfectly true with the seating through the pivots aforesaid sliding in the holes in
guide peice and bearing boss aforesaid and the distance that the said clack or clapper
rises from the said seating in valve is regulated by means of the guide peice aforesaid
forming a bearing against which the aforesaid shoulder on pivot on upperside of said
clack rests when the said clack has risen sufficiently. The pivot on the upperside of
clack I continue a little through the said guide peice so that the clack or clapper may
be ground to the seating in body of valve.
These valves by means of a screw spindle working through a packing box may be
used as ordinary stop valves.
Dated this 27th day of December 1887

page_text: Improvements in Check or Back Pressure Valves, Applicable also
to Screw Down Valves.
I AARON BRADSHAW Griffin Works Willows Lane Accrington Lancashire Engineer
and Brass Founder, 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:-
These improvements are intended to remove certain defects found in check or back
pressure valves as they are now constructed viz. To so construct such valves that the
moving clacks or clappers shall offer the least resistance to the flow of the liquid or
fluid passing through the valve and shall not "Stick" or "Hold" on the bodys of the
valves when such clack or clapper should freely close against the valve seating. When
the clacks or clappers of such valves "stick" or "hold" and do not go freely to their
seating the liquid or fluid such valves should prevent froin reflowing is not so pre-
vented and often serious damage is caused through such "sticking."
And to so
construct the said valves that the clacks or clappers may be ground to their seatings
or that new clacks or clappers may be fitted to the bodys of said valves without
removing the said valves from the pipes to which they are applied.
::
Check or back pressure valves as constructed under these improvements are as
follows viz-I form the inlet and outlet branches of these valves as is usual with
ordinary stop valves and I form the seatings in the said valve bodys at a suitable
angle to the said inlet and outlet, branches the most suitable angle for general purposes
is 45° forty five degrees from the line of pipe to which the valve is fixed but this
angle I modify to suit special circumstances. Underneath and at a suitable distance
from the aforesaid seating I form a bearer or support said bearer or support I cast
in one peice with body of cach valve so that a pivot in the centre and on the lower
side of moving clack or clapper may move easily in a hole bored into the said bearing
or support the aforesaid hole being bored true with the inside diameter of the said
seating. On the upperside of the said clack or clapper I also form a pivot and on
this pivot I form a shoulder the said shoulder acting as a guard to prevent the said
clack or clapper lifting to high from the scating of the valve. The pivot on upperside
of clack or clapper I cause to pass through a guide peice the said guide peice being
screwed inside a boss formed over the seating in the body of valve a hole is bored
through the centre of the said guide peice true with the hole in seating of valve. To
put the clack aforesaid into the valve and in proper working position it is necessary
to take the guide peice out of valve body and when the said clack or clapper is in
position the aforesaid guide peice may be screwed into the aforesaid boss in body of
valve the hole in centre of guide peice allowing the pivot on the upperside of the said
clack to enter into it thus the said clack as it rises and falls from or to the said seating
is held perfectly true with the seating through the pivots aforesaid sliding in the holes
in guide peice and bearing aforesaid and the distance that the said clack or clapper

page_text: rises from the said seating in valve is regulated by means of the guide peice aforesaid
forming a bearing against which the aforesaid shoulder on pivot on upperside of said
clack rests when the said clack has risen sufficiently. The pivot on the upperside of
clack I continue a little through the said guide peice so that the clack or clapper may
be ground to the seating in body of valve.
These valves by means of a screw spindle working through a packing box may be
used as ordinary stop valves.
In order that the said invention may be most fully understood and readily carried
into effect I will now proceed to describe the drawings hereunto annexed.