Year: 1886

page_text: I GEORGE FREDERICK REDFERN, of the General Patent Office, N° 4, South
Street, Finsbury in the county of Middlesex, Patent Agent, do hereby declare
the nature of this invention (a communication from abroad by La Compagnie
Générale Transatlantique, of Paris in the Republic of France) and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:-
This invention relates to the construction of an improved metallic valve which is
represented in the accompanying drawing in which figure 1 is a vertical section
and figure 2 a plan of the same. Similar letters in both the figures refer to
similar parts.
The improved valve is constructed of a well planed disc or plate B, of red copper
of about 3 millimetres in thickness and formed with a central hole; the edge of the
metal round this hole is bent up so as to form a socket as shewn at C; this socket
is strengthened by means of a strong support or lining D, of tin.
When the valve is in operation, the said socket slides along a spindle A carrying
a stop piece hereinafter described.
The valve is pressed upon its seat by means of a spring F of red copper, the
maximum contraction of which is reached under a pressure much less than the
limit of elasticity of the spring. A stop piece G of the form of a round cap,
the circular edge of which limits the ascending motion of the valve, is arranged to
receive the whole of the spring in a groove or channel H, at the end of the stroke
of the valve. The groove or channel H is provided with perforations for the
escape of the water.
Valves of this construction are not liable to lose their proper shape and will
remain thoroughly water tight; moreover the spring by reason of the peculiar
arrangement of the stop piece will preserve its elasticity for an indefinite period of
time. The said valves will be found to form an advantageous substitute for india-
rubber valves which require to be often changed and the seats of which become
deteriorated in the course of time, and also for bronze valves which are always
very noisy and gradually cease to be water tight.

page_text: The sheath or socket C in the centre of the copper disc B prevents any rupture
of the parts from taking place and forms with the stop piece G the characteristic
feature of the valve; both these pieces serve to ensure its proper working and
duration. The valve bearing alternately upon two large planed surfaces remains
true and consequently water-tight.
Finally, owing to the deep box or chamber of the said stop piece, the convolu-
tions of the spring are not liable to come into contact with one another and are not
subjected to the hammering or vibrating action which usually ends in the breakage
of some of the parts.
The valves are applicable to all kinds of pumps and especially to air pumps, feed
pumps, and the like.
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 combination of the disc B having a socket C and guided by the spindle A
and held in position by the spring F with the stop piece G, the cap H of which
contains the spring F and limits its motion substantially as herein before described
and represented in the accompanying drawing.