Drying and gas or vapor contact with solids – Apparatus – With automatic control
Patent
1992-09-14
1994-10-18
Gromada, Denise
Drying and gas or vapor contact with solids
Apparatus
With automatic control
34638, 34652, 34654, F26B 1300
Patent
active
053555953
ABSTRACT:
A steam box includes a system for distributing steam onto a web being calendered. At least one valve is connected to the steam distributing system for controlling the flow of steam onto the web. The steam box also has element for feeding hot steam to the valve. Each valve has at least three steam channels, namely an inlet channel for feeding the steam to the valve, an outlet channel of the valve for feeding the steam onto the web and a recirculation channel for recirculating the steam. The valve also has a check element for controlling and dividing the incoming steam flow from the inlet channel between the outlet channel and recirculation channel of the valve, and a return pipe connected to the recirculation channels of the valves, capable of routing the steam directed to the recirculation channel of the valve to e.g., the condensate return line of the steam distributing system. By virtue of such a circulation the valve can be kept warm even when no steam is directed via the valve, thus preventing the formation of droplets and their blowing onto the web.
REFERENCES:
patent: 4050630 (1977-09-01), Dupasquier
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patent: 4945654 (1990-08-01), Mason
Koivukunnas Pekka
Lappalainen Teuvo
Gromada Denise
Valmet Paper Machinery Inc.
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