Improvements in Check or Back Pressure Valves.
Year: 1891

page_text: Date of Application, 20th May, 1891
Complete Specification Left, 3rd Feb., 1892-Accepted, 5th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in Check or Back Pressure Valves.
I AARON BRADSHAW Griffin Works, Willows Lane Accrington Lancashire
Engineer and Brass Founder do hereby declare the nature of this invention to be as
follows:-
By these improvements valves constructed to prevent the reflow of any liquid or
fluid passing through them will work more effectually.
These improvements are as follows-viz.-Into a suitable body or case having
inlet and outlet branches, I form a double seating at an angle to the centre line of
before named branches, the most suitable angle being 45° and upon the before
named double seatings I fit two valves, one above the other and so formed as to
act independently of each other the lower valve having central guide pins above
and below the lower guide pin passing through and being kept in position by a
projecting piece formed inside said case or body and at a suitable distance below
the said scating the upper guide pin being made to fit into a hole bored into a boss
upon back of
upper valve the said boss being made to slide into a guide ring placed
above top seating at such distance that the said guide ring may determine the
distance that the upper valve may rise from its seating.
The action is as follows-ci.-The two seatings are so placed that the two
valves when ground upon them are quite free to rest upon their respective seatings
and at the same time have perfect freedom to rise as the liquid or fluid passes
through them but should the flow of the said liquid or fluid cease the said valves
will fall upon their respective seatings and form a double check to prevent reflow.
Should one valve be held off its seating by dirt or from any other cause the other
valve is at liberty to fall upon its seating and prevent reflow.
or
By means of the aforesaid support beneath the bottom seating and the guide
ring above the top seating the said valves are prevented from "sticking
"holding" off their seatings when the said seatings are free from dirt or other
obstruction.
AARON BRADSHAW.
COMPLETE SPECIFICATION.
Improvements in Check or Back Pressure Valves.
I AARON BRADSHAW, Griffin Works, Willows Lane, Accrington, Lancashire,
Engineer and Brassfounder, 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 :-
By these improvements valves constructed to prevent the reflow of any liquid or
fluid passing through them will work more effectually.
These improvements are as follows-viz.-Into a suitable body or case having
inlet and outlet branches I form a double seating at an angle to the centre line of
before named branches the most suitable angle being 45° forty-five degrees and
upon the before named double seating I fit two valves one above the other and so
formed as to act independently of each other the lower valve having central guide
pins on its upper and lower faces the lower guide pin being kept in position by
means of a boss formed in body or case of valve at a suitable distance below bottom
seating so that the said boss shall not obstruct the thoroughfare in valve body the
upper guide pin being made to fit into a hole bored into a boss upon back of upper
Pri 8d1

page_text: valve the said boss being made to slide through a guide ring placed above top
seating at such distance that the said guide ring may determine the distance that
the upper valve may rise from its seating..
The action is as follows.
The two seatings are so placed that the two valves when ground upon them are
quite free to rest upon their respective seatings and at the same time have perfect
freedom to rise as the liquid or fluid flows through valve orifice but should the
said liquid or fluid attempt to reflow then each of the ground valves aforesaid tries
to fall upon its seating but if dirt or other matter settles upon one seating the valve
belonging to such seating is prevented from closing but the other seating being
free from obstruction its valve closes upon it thus preventing reflow.
The said valves being supported at a distance above and below the said double
seating are not liable to "stick" or "hold off" their seatings when the said seatings
are free from dirt or other obstruction.
Such being the nature and object of this my said invention in order that the same
may be fully understood I have hereunto annexed a sheet of drawing in which the
invention is fully explained.
Fig. 1. shows the said check or back pressure valve in section A is body or case
of valve B a screw cap for closing valve body C guide ring to keep upper
valve D in position and also to regulate the rise of upper valve, E lower valve F plug
to close up hole below lower valve.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
Two valves acting independently and resting upon a double seating and being
supported and kept in position in the manner described when employed for the
purposes named.
Dated this 2nd day of February 1892.
AARON BRADSHAW.