MENTS IN VALVES FOR STOP COCKS
Year: 1884

page_text: I JOHN CRABTREE of 12 Argyle Street Keighley in the County of York,
Spinning Manager do hereby declare the nature of my invention for IMPROVE-
MENTS IN VALVES FOR STOP COCKS to be as follows:-
It is well known that great inconvenience has been experienced with bib cocks
connected to water mains, through the constant leakage of the cocks in consequence
of the leather washers forming the stoppers of the valves after being a short time
in use become so hard through being pressed on the valve faces, that they require
constant renewal especially in districts where the water is so soft that it attacks
and decomposes the metal of the valve face.
My object is to construct a valve cover that is not so much dependent on the
Emoothness or regularity of the metal face of the valve as when leather washers
are used, and which will effectually stop the flow of the water when a slight
pressure is applied to the cover, which I accomplish by forming a small metal disc
with which is also formed a guide spindle, and placing on the disc a covering
of india rubber, such covering being recessed and an internal flange formed so
that when the covering is placed on the disc it is secure and cannot become
disengaged except when taken out of the cock.
The face of the india rubber cover may be straight, curved, or conical as required
by the configuration of the metal face of the valve, and when pressure is applied
to the same by a lever or screw, the india rubber covering imbeds itself in the
metal face thereby effectually stopping the flow of water.

page_text: COMPLETE
DIECIFICATION.
I, JOHN CRABTREE, of 12 Argyle Street Keighley in the County of York,
Spinning Manager do hereby declare the nature of my invention for IMPROVE-
MENTS IN VALVES FOR STOP COCKS and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
It is well known that great inconvenience has been experienced with bib cocks
connected to water mains through the constant leakage of the cocks in consequence
of the leather washers forming the stopper of the valve after being a short time
in use becomes so hard through being pressed on the valve face that they require
constant renewal especially in districts where the water is so soft that it attacks
and decomposes the metal of the valve face.
My object is to construct a valve cover that is not so dependant on the
smoothness or regularity of the metal face of the valve as when leather washers
are used and which will effectually stop the flow of the water when a slight
pressure is applied to the cover which I accomplish by forming a small metal
disc with which is also formed a guide spindle and placing on the disc a covering
of india rubber such covering being recessed and an internal flange formed so that
when placed on the metal disc it is secure and cannot become disengaged except
when, taken out of the cock.
The face of the india rubber cover may be straight, curved, or conical as
required by the configuration of the metal face of the valve and when pressure
is applied to the same by a lever or screw, the india rubber covering imbeds itself
In the accom-
in the metal face thereby effectually stopping the flow of water
panying drawings-Fig 1 represents a view of an ordinary screw down stop cock-
fitted with my improved valve cover which is composed of india rubber and is
indicated by the letter A and is formed with a recess for the reception of the
flange at bottom of spindle S on turning the screw the valve cover is allowed to
rise from its seat or is pressed thereon as the case may be when in the latter case
the india rubber yields filling up any irregularity in the seating thereby stopping
the flow.
By Fig 2 I show a modified plan of securing the india rubber which is accom-
plished by forming a hollow disc D with an internal flange which effectually
secures the india rubber A when inserted.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
The stopping of bib cocks by discs composed of india rubber applied substan-
tially in the manner shown and described.
Dated this 18th day of February 1885.