Year: 1889

page_text: I REGINALD HADDAN of the firm of Herbert & Co. Patent Agents of 18 Buckingham
Street Strand W.C. London in the County of Middlesex, Civil Engineer do hereby
declare the nature of this invention, a communication to me from abroad by Ramon
Sabater y Casals and Ramon Sabater y Fajula both of Barcelona in the Kingdom of
Spain Manufacturers and in what manner the same is to be performed to he
particularly described and ascertained in and by the following statement :-
This invention relates to that class of cocks or valves usually known as screw down
cocks and the object of the improvements is to so construct such cocks, whether usod
for steam, liquid, or gas that leakage may be prevented.
To this end the plug or closing device is formed of an annular glass or crystal
plate in combination with a circular plate or disc preferably of the same material
which is in contact with the former, when the cock is closed, to form a hermetical
closure even against high pressure.
The accompanying drawing illustrates a construction of screw down cock embodying
the improvements.
Fig. 1 represents the outside view of the cock in side elevation.
vertical longitudinal section thereof.
Fig. 2 is a
In the body of the cock is formed or fixed an annular flange A of metal, upon
which rests an annular glass or crystal collar B, there being interposed between the
two an annular washer of any suitable resilient material. The open centre of these
annular parts is the passage for the fluid which the plug of the cock is designed
to close.
Above the annular glass or crystal collar B rests a circular disc C. The collar B
and the washer thereunder are fixed in place by means of the tubular core 1 which is
screw threaded and screwed in the body of the tap so that its lower rim presses on
the collar B. The tube I serves also to guide the disc and is open to communicate
with the ontlet of the cock.
The cap E is also screw threaded and is screwed to the body of the cock forming
a solid cap thereon having an opening in its centre through which passes the
spindle E, which has at its lower end a metal disc D, to press upon the glass or

page_text: crystal disc C. The spindle E is solid with a tubular piece G screw threaded to
engage on the block F which is screwed at the same timo into a tubular extension EL
fixed upon the body of the cock, or upon the cap E'.
The interior of tube El serves to receive packing to be compressed by the block F¹
as in an ordinary stuffing box.
By turning the spindle, and consequently the piece G in one or the other direction
the cock is shut or opened. The ring B and disc may be ground on their
opposing faces.
Having now particularly described, and ascertained the nature of the said
invention and in what manner the same is to be performed declare that what
1 claim is
1. In screw down valves, a disc plug of glass or crystal in combination with an
annular seat therefor of the same material for the purpose set forth.
2. The construction of zerow down cock substantially as herein shown and
described having an annular flange A, ring B, and washer thereunder, tube I, dise C
cap E' and screw down spindle E for operation as set forth.
A Silar day of February 1000.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to Applicant.