IMPROVEMENTS IN VALVE AND BALL Cocks OR TAPS."
Year: 1877

page_text: LETTERS PATENT to William Pawson, of Grantham, in the County of
Lincoln, Plumber, for the Invention of "IMPROVEMENTS IN VALVE AND BALL
Cocks OR TAPS."
PROVISIONAL SPECIFICATION left by the said William Pawson at the Office
of the Commissioners of Patents on the 31st March 1877.
WILLIAM PAWSON, of Grantham, in the County of Lincoln, Plumber.
MENTS IN VALVE AND BALL COCKS OR TAPS."
"IMPROVE-
In the screw taps or cocks used for water, either hot or cold, or steam, and in
ball cocks or taps, the valve is usually composed of a disc or piece of rubber or
leather fitted to the end of the spindle, which opens and closes the cock or tap.
This arrangement of valve has been found to be very liable to leakage, and also
difficult to repair. Now, by my Invention, I obviate, in a great degree, these
defects.
In carrying out my Invention, I adopt mainly the following arrangements, taking
as an instance the screw tap:-The chamber for the valve is somewhat lengthened,
and in same I place a ball of rubber or elastic material, said ball resting against the
seat.
The screw spindle, which in ordinary screw taps is provided with the valve,
terminates in a cup-shaped piece which closes over said ball, and prevents the ball
finding its way into the outlet opening of the cock or tap. Thus, by these arrange-
ments, when the cock is closed, the ball rests firmly on its seat.
When the cock or tap is to be opened it is unscrewed in the ordinary way, and
the pressure of the water forces the ball of india-rubber or elastic material from its
seat, the cup-shaped portion of the screw spindle guiding, as it were, the ball, and
preventing the same from going into the outlet opening.

page_text: It is evident that the cock or tap may, in some cases, be made self-closing, this is
clone by the pressure of the water holding the valve to its seat.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said William Pawson in the Great Seal Patent Office on the 29th Sep-
tember 1877.
WILLIAM PAWSON, of Grantham, in the County of Lincoln, Plumber.
MENTS IN VALVE AND BALL COCKS OR TAPS.”
" IMPROVE-
In the screw taps or cocks used for water, either hot or cold, or for steam, and in
ball cocks or taps, the valve is usually composed of a disc or piece of rubber or
leather, with or without a metal portion, fitted to the end of the spindle which
opens and closes the cock or tap. This arrangement of valve has been found
very liable to leakage, and also difficult to repair. Now, by my Invention, I
obviate, in a great degree, these defects.
In carrying out my Invention, I adopt mainly the following arrangements, taking
as an instance the screw tap. The chamber for the valve is somewhat lengthened,
and in same I place a ball of rubber or elastic material, said ball resting against the
seat.
The screw spindle, which in ordinary screw taps is provided with the valve,
terminates in a cup-shaped piece which closes over said ball and prevents the ball
finding its way into the outlet opening of the cock or tap. Thus, by these arrange-
ments, when the cock is closed, the ball rests firmly on its seat.
When the cock or tap is to be opened it is unscrewed in the ordinary way, and the
pressure of the water forces the ball of india-rubber or elastic material from its
seat; the cup-shaped portion of the screw spindle guiding, as it were, the ball, and
preventing the saine from going into the outlet opening.
It is evident that the cock or tap may, in some cases, be made self-closing, this is
done by the pressure of the water holding the valve to its seat.
Having thus far described the nature of the said Invention, and incidentally
intimated in what manner the same is to be performed, I will now proceed (aided
by the accompanying 'Drawings) to further and particularly describe and ascer-
tain in what manner the same is to be performed or carried out in practice, that is

page_text: fitted and arranged as herein-before stated, so as to press against the seat, and insure
effectual action.
In witness whereof, I, the said William Pawson, have hereunto set my hand
and seal, this Twenty-soventh day of September, in the year of our Lord
One thousand eight hundred and seventy-seven.
Witness,
W. J. WIDDOWSON,
Wharf Road,
Grantham.
WILLIAM PAWSON. (L.S.)
87, Westgate, Grantham,