IMPROVE- MENTS IN COCKS OR VALVES
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said James Neville Sperryn at
the Office of the Commissioners of Patents on the 18th October 1882.
JAMES NEVILLE SPERRYN of Brixton Hill in the County of Surrey "IMPROVE-
MENTS IN COCKS OR VALVES
"
My Invention relates to push cocks or valves for controlling the supply of
liquids or fluids and it has for its object to provide a cock which will close
automatically and cut off the supply immediately the spindle is released thereby
preventing waste. The Invention consists essentially in the employment of a stem.
or spindle carrying a pair of cupped leather plungers or pistons which are secured
to the spindle at a certain distance apart and move up and down therewith within
the barrel of the cock, the plungers being so arranged and the barrel so constructed
that when the spindle is pushed in to open the supply a free passage will be given
to the fluid which acting on the plungers will close the supply immediately the
spindle is released. One of the plungers is set on the spindle at a point between
the inlet and outlet and the barrel of the cock is constructed with a spherical
enlargement into which said plunger passes when the spindle is pushed in, thereby
affording the liquid free passage around the plunger and spindle to the outlet. The
upper plunger is set on the spindle above the outlet and both plungers are so
arranged that the fluid will expand them and ensure a tight closure under any
pressure preventing waste and leakage.. The inner end of the spindle terminates
in a head or flange which fits in the barrel or pipe and guides the spindle, said
Hange being cut away or provided with openings so as not to impede the supply
The plungers may be made of leather india rubber vegetable fibre or other
suitable material and are firmly clamped between collars on the spindle.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Neville Sperryn in the Great Seal Patent Office on the
18th April 1883.
JAMES NEVILLE SPERRYN of Brixton Hill in the County of Surrey. "IMPROVE-
MENTS IN COCKS OR VALVES."
My Invention relates to push cocks or valves for controlling the supply of
liquids or fluids, and it has for its object to provide a simple and effectual cock
having no stuffing box, and which will close automatically immediately the spindle
is released. The Invention consists essentially in the employment of two cupped
leather plungers or pistons which are secured upon a stein or spindle at a certain
distance apart and have the outlet between them, the plungers being so arranged
and the barrel so constructed that when the spindle is pushed in to open the cock,
a free passage will be given to the fluid, and when the spindle is released the fluid
pressure acting on the plungers will immediately close the cock.
DESCRIPTION OF DRAWINGS
Figure 1 is an elevation, and Figures 2 and 3 central vertical sections of one
form of bib cock constructed according to this Invention. Figure 4 is a view of
another form, and Figure 5 is a view of a stop cock.
a is the spindle furnished with a head and carrying two cup shaped plungers,
the outlet orifice e being situated between them. The upper or outer plunger bis
in lieu of a stufling box and also acts as a medium in closing the cock. The
lower or inner cup shaped plunger c chokes the barrel and its upper portion-limits
the rise and at same time effects the sealing of the cock a second time. d is the
barrel in which the spindle and plungers work having a spherical enlargement d'
with which the inlet communicates. The part of the barrel in which the
plunger c Gts is preferably of rather larger diameter than the upper part d in which
the plunger b fits, the plunger e closing against a seat formed by a shoulder as
shown. The enlargement d' is for the purpose of giving a clear passage for the
liquid around the plunger when the plunger is pushed in, as shown in Figure 3.
The barrel is cast in one piece of the form shown, the top end of the barrel being
dome shaped and a hole being drilled to receive the spindle. The barrel is bored
to receive the plungers, access being had through an aperture at bottom which is
closed by the screw plug i. g is a tubular extension of the lower end of the spindle
fitting and sliding on a guide pin h on the screw plug i, or the lower end of thie
spindle might be of reduced. diameter and work in a hole in the said plug. By the
use of the cupped form of plungers, a perfectly tight closure is ensured under all
pressures, and waste by leakage is prevented. These cupped plungers may be
made of leather, indinrubber, vegetable fibre, or other suitable material and are.
firmly secured between collars on the spindle..
Having described the nature of my Invention and the manner of performing the
same, I declare that what I claim as my Invention to be protected by the herein-
before in part. recited Letters Patent is-A cock or valve whose spindle is provided
with two cupped plungers situated, one at either side of the outlet orifice and fitted
to work in a barrel constructed substantially as shown and described, as and for the
purpose herein specified.
In Witness whereof I the said James Neville
Sperryn have hereunto set my hand and