AN IMPROVEMENT IN THE CONSTRUCTION OF TAPS AND COCKS
Year: 1877

page_text: LETTERS PATENT to John Cotton, of Bowling, in the Parish of Bradford, in
the County of York, Engineer, for the Invention of "AN IMPROVEMENT IN THE
CONSTRUCTION OF TAPS AND COCKS."
aled the 8th September 1877, and dated the 23rd March 1877.
PROVISIONAL SPECIFICATION left by the said John Cotton at the Office of
the Commissioners of Patents on the 23rd March 1877.
JOHN COTTON, of Bowling, in the Parish of Bradford, in the County of York,
Engineer. "AN IMPROVEMENT IN THE CONSTRUCTION OF TAPS AND COCKS."
In that construction of taps and cocks in which the valve seat is parallel with
the axis of the barrel the seat has been found to wear rapidly, and thereby to render
the tap leaky and ultimately useless. To remedy this defect I propose, instead of
casting the valve seat with the partition which divides the barrel into two parts
(the inlet and the outlet), to fit the valve seat to the partition in such way as will
permit of its ready removal when worn, and replacement by a new valve seat.
The opening in the partition, through which the water or other liquid flows, has
a screw thread cut in it to receive a ring of suitable sectional shape, which is to
constitute the valve seat. This ring I cast of a polygonal or other convenient form
or figure internally, to receive a key of corresponding shape, which I use to insert
the ring in its place and to remove it therefrom when the lip or seat for the valve
is worn. Access to the valve seat, or to the partition which is to receive it, will be
obtained by removing the box in which the valve stem is fitted.
By the employment of my Invention a great economy in taps and cocks will be
effected, as the parts most exposed to wear may be renewed indefinitely and with
great facility, thereby rendering the tap or cock equal in respect of efficiency to a
new one, and that at a very small cost.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Cotton in the Great Seal Patent Office on the 15th September
1877.
JOHN COTTON, of Bowling, in the Parish of Bradford, in the County of York,
"AN IMPROVEMENT IN THE CONSTRUCTION OF TAPS AND COCKS."{
In that construction of screw taps and cocks in which the seat for receiving the
metal disc valve is parallel with the axis of the barrel, the seat has been found to wear
rapidly, and thereby to render the tap leaky and ultimately useless. Morcover a
considerable loss of time is occasioned by the replacement of such worn out taps by
new ones, the pipes with which they are connected having to be displaced in order
to effect the required alteration. To remedy these inconveniences I propose, instead
of casting the valve seat with the partition which divides the barrel into two parts
(the inlet and the outlet), to fit the valve seat to the partition in such way as
will permit of its ready removal when worn, and replacement by a new valve
seat.
In the accompanying Drawing my Invention is shown as applied to a cock for
controlling the passage of high-pressure steam.
Fig. 1 is a side view of the cock, and Fig. 2 is a vertical central section, showing
the improvement applied thereto.
In these Figures A is the barrel threaded internally, as usual, to receive coupling
pipes; B is the partition which divides the barrel into two parts; the part of the
partition which is parallel with the axis of the barrel is cast with a circular hole in
line with the valve stem C, which stem is threaded and works in the thread of n
box D, as usual in this class of cocks, for the purpose of raising and lowering the
disc valve E fitted to the end of the stem. The hole in the partition B is tapped to
receive the screw thread of a ring F which forms the valve seat. This ring is cast
of a hexagonal or other polygonal form or figure internally (see the plan view,
Fig. 3), to receive a key of corresponding shape, which is used to insert the ring in
its place and to remove it therefrom when the lip or seat for the valve is worn.
Access to the valve seat, or to the partition which is to receive it, will be obtained
by removing the box D in which the valve stem is fitted.
By the employment of this Invention a great economy in taps and cocks will be
effected, as the part most exposed to wear may be renewed indefinitely and with
great facility, thereby rendering the old tap or cock equal in respect of efficiency to
a new one, and that at a very small cost, and avoiding the necessity for displacing
the coupling pipes when the valve seat requires to be renewed.
Having now set forth the nature of my Invention of an improvement in the
construction of taps and cocks, and explained the manner of carrying the same
into effect, I wish it to be understood that under the above in part recited Letters
Patent I claim, fitting screw taps and cocks with a removable valve seat, in the
manner and for the purpose above described.
In witness whereof, I, the said John Cotton, have hereunto set my hand
and seal, the Twelfth day of September, in the year of our Lord One
thousand eight hundred and seventy-seven.