IMPROVEMENTS IN VALVES
Year: 1884

page_text: I, JOSEPH PRITCHARD of Canning Town in the County of Essex Brass Finisher
do hereby declare the nature of said Invention for "IMPROVEMENTS IN VALVES"
to be as follows:-
My Invention relates more especially to sluice valves for hydraulic purposes but
may also be applied to valves for other purposes acting on a similar principal for
example to valves or shutters such as are used in gas mains or in the water tight
compartments of ships. In these valves as at present constructed a great amount
of time and trouble is required for surfacing the metal of the faces of the valve
and seat while the least twist or cutting by grit destroys the water tight character
of the valve.
According to my Invention I overcome this difficulty by forming round the face
of the seat a groove preferably wedge shape and in this groove I pack leather,
asbestos or any other suitable material capable of forming a slightly compressable
packing over which the valve slides and by which it is made tight. The lower
inner edge of the valve or shutter is preferably bevelled so as to prevent it fouling
the packing when slidden into place.

page_text: I. JOSEPH PRITCHARD of Canning Town in the County of Essex Brass Finisher
do hereby declare the nature of said Invention for "IMPROVEMENTS IN VALVES "
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:—
My Invention relates more especially to sluice valves for hydraulic purposes but
may also be applied to valves for other purposes acting on a similar principle for
example to valves or shutters such as are used in gas mains or in the water tight
compartments of ships-In these valves as at present constructed a great amount
of time is occupied and trouble taken in surfacing the metal of the faces of the
valve and seat whilst the least twist or cutting by grit destroys the water tight
character of the valve.
According to my Invention I overcome this difficulty by forming round the face
of the seat a groove preferably wedge shaped and in this groove I pack leather or
asbestos or any other suitable material capable of forming a slightly compressible
packing over which the valve slides and by which its closure is made tight. The
Tower edge of the valve or shutter is preferably bevelled so as to prevent it fouling
the packing when slidden into place.
The accompanying Drawing represents a valve constructed according to my
Invention Figure 1 being a face view of the valve framing guides and seating and
Figures 2 and 3 sections of the same taken at right angles to each other. Figure 4
is a face view of the valve and Figures 5 and 6 are sections thereof taken at right
angles to each other-I form a groove at A round the face of the seat of the valve
and in it I place the packing B of the character hereinbefore mentioned-The
groove is shewn wedge shaped in section but I do not limit myself to that form
although I prefer it. The other parts of the valve may be of the usual or other
suitable construction or form but I prefer to bevel the lower edge of the valve
or shutter in the manner shewn at C. Figure 5 for the purpose herein before
indicated.
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 :-
Constructing valves or shutters of the kind herein before mentioned with
Beatings formed of leather asbestos or the like contained in a groove or grooves
substantially as hereinbefore described and illustrated in the accompanying
Drawings.
"
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