Improvements in Valve Seats.
Year: 1895

page_text: Date of Application, 20th Feb., 1895
Complete Specification Left, 2nd Oct., 1895-Accepted, 2nd Nov., 1895
PROVISIONAL SPECIFICATION.
Improvements in Valve Seats.
We, JOHN ADDY HOPKINSON and JOSEPH HOPKINSON, both of the Firm of
J. Hopkinson & Co. Ltd., of Huddersfield, in the County of York, Engineers,
do hereby declare the nature of this invention to be as follows:-
:-
This invention relates to valve seats which are made separate from the valve
body and has for its object to prevent leakage between the seat and the body of
the casing or ring to which the seat is attached.
The said invention is applicable to valve seats generally but particularly to
seats constructed in accordance with the invention described in the Specification
of Letters Patent No. 7633 1894. According to our present invention we so
construct the seat that the fluid pressure under the valve can act thereon in a
direction that tends to press the seat against its support with a force equal to or
greater than the pressure acting to force the seat from its support or with a
force sufficient to prevent the displacement of the seat by such fluid pressure.
In carrying our invention into practice we so construct the seat relatively to the.
valve that an annular surface is provided between the inner edge of the seat and
the inner edge of the valve sufficient for the aforesaid purpose, that is to say we
make the diameter of the seat face greater than the largest diameter of the
thoroughfare through the seat ring or its support. We preferably do this by.
hollowing out rebating or recessing the seat face along the inner circumference
thereof, and we thereby provide an annular surface surrounded by the seat face
proper upon which the fluid may act to press the seat ring to the body.
Our improved screw seat ring so constructed will remain perfectly tight under
all conditions of temperature and pressure. The same construction can obviously
be applied to ordinary seat rings with advantage.
Dated this 20th day of February 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.
We, JOHN ADDY HOPKINSON and JOSEPH HOPKINSON, both of the Firm of
J. Hopkinson & Co. Ltd., of Huddersfield, in the County of York, Engineers, do
hereby declare the nature of this invention 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 valve seats which are made separate from the valve
body and has for its object the prevention of leakage between the seat and the
body of the casing or ring to which the seat is attached.
The said invention is applicable to valve seats generally but particularly to
seats constructed in accordance with the invention described in the Specification

page_text: of Leiters Patent No. 7633 of 1894. According to our present invention we so
construct the seat relatively to the valve that the fluid pressure under the valve can
act on the seat in such a direction that it tends to press the same against its support
with a force equal to or greater than the pressure acting to separate it from its
support or with a force sufficient to prevent the displacement of the seat by such
pressure...
In the accompanying drawing we have shown in central section one form of
valve seat, and a valve resting thereon, constructed in accordance with our
invention.
A is the supporting ring preferably made of the same metal as the valve casing
and tightly secured therein; B is a removable scat ring screwed on the supporting
ring; C is the valve: 1
In carrying, our invention into practice we so construct the seat ring B relatively
to the valve C that an annular surface b is provided between the inner edge of the
seat ring and the inner edge of the valve sufficient for the aforesaid purpose we
do this in the construction shown in the drawing by making the inner diameter of
the seat face greater than the largest diameter of the thoroughfare through the seat
ring or its support, that is-to say, we hollow out or rebate or recess the seat face
along the inner circumference thereof, and we thereby provide an annular surface
surrounded by the seat face. proper upon which surface the fluid will act to press
the seat ring to the body. The shape of the rebate or recess b is not material and
may be varied as desired. Our improved seat ring will remain perfectly tight
under all conditions of temperature and pressure.
The same construction can obviously be applied with advantage to other forms
of removable seat rings whether the same are mounted on supporting rings as
shown in the drawing or are driven in the valve body or otherwise applied directly.
thereto..
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. A valve-seat.constructed relatively to its valve as hereinabove set forth for
the purpose specified.
2. The combination with a supporting ring in the valve body, of a removable
seat-ring carried by the supporting ring and constructed in relation to the valve
substantially as described with reference to the accompanying drawing, for the
purpose specified.
Dated this 30th day of September 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.