Year: 1887

page_text: Date of Application, 16th June, 1837
Complete Left, 10th Mar., 1888
Complete Accepted, 13th Apr., 1888
I, EDWARD ALFRED COWPER of No. 6 Great George Street, Westminster in the
County of Middlesex, Consulting Engineer do hereby declare the nature of this
invention to be as follows:-
My Improvement relates to the construction of the Hot Blast Valve used for
shutting off Hot Blast, or allowing it to pass.
Imany years since constructed both lifting and sliding Hot Blast Valves and Valve-seats
with a circulation of water in order to keep them cool, but by my present invention I am
enabled to keep the valve sufficiently cool, and at the same time dispense with the use
of water in the Valve itself, though I retain the circulation of water in the fixed
valve-seat, and I am enabled to accomplish this by providing the valve with two
sunken recesses, one on each side, and inserting therein a sheet of Asbestos or a mass
of fibrous Asbestos, Mica, or other suitable refractory material. The refractory
material may be retained in place by means of dovetails, bolts, plates or other suitable
appliances, so as to be below the working face of the Valve. Thus the heat is con-
ducted away by the circulation of water in the Valve-seat, and the conduction of heat
to the Valve itself, is caused to be so slow, owing to the intervention of the Asbestos
or other refractory material, that the contact of the face of the Valve, with the
cooled Valve-seat, abstracts the heat, so as to prevent injury to the valve, even when
temperatures of 1600° and 1700° degrees Fahrenheit are used.
תו, ת
321 1
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1007
ABEL & IMRAY,
Agents for the Applicant.

page_text: Improvements in Hot Blast Valves.
I, EDWARD ALFRED COWPER, of No. 6 Great George Street, Westminster, in the
County of Middlesex, Consulting Engineer, 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 :-
My improvement relates to the construction of the hot blast valve used for shutting
off hot blast or allowing it to pass.
I, many years since, constructed both lifting and sliding hot blast valves, and valve
seats with a circulation of water, in order to keep them cool, but by my present
invention I am enabled to keep the valve sufficiently cool, and at the same time
dispense with the use of water in the valve itself, though I retain the circulation of
water in the fixed valve seat, and I am enabled to accomplish this by providing the
valve with two sunken recesses, one on each side, and inserting therein a sheet of
asbestos, or a mass of fibrous asbestos, mica, or other suitable refractory material. The
refractory material may be retained in place by means of dovetails, bolts, plates, or
other suitable appliances, so as to be below the working face of the valve.
Thus, the heat conducted away by the circulation of water in the valve seat, and
the conduction of heat to the valve itself, is caused to be so slow, owing to the inter-
vention of the asbestos, or other refractory material, that the contact of the face of
the valve, with the cooled valve seat, abstracts the heat, so as to prevent injury to the
valve, even when temperatures of 16 0° and 1700° Fahrenheit are used.
Fig. 1 is a sectional elevation of a valve and valve seat, constructed according to
my present invention, and Fig. 2 is an elevation of the valve alone.
A is the valve which may be of ordinary cast steel, of cast iron, of chrome steel, or
other suitable alloy.
B B is the cast iron seat against which it closes by the pressure of the blast, C is
the box or casing, and D is a lining of fire brick, for protecting the seat from
immediate contact of the current of hot air passing through when the valve is open.
E E is a wrought iron pipe cast in the seat B B the two ends of which project outside
the valve box at the top thereof, one end serving as an inlet for water and the other
as an outlet.
F and F are sheets or layers of asbestos or other refractory material, for
protecting the valve, which are retained in their places by means of the plates G
and G¹ fixed by the snugs H and the screws J.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The combination of a valve protected by a layer or layers of asbestos or other
nonconducting material with a seat kept cool by the circulation of water, substantially
as described and shown on the accompanying drawing.