Method and apparatus for controlling the atmosphere in a carburi

Details Method and apparatus for controlling the atmosphere in a carburi Method and apparatus for controlling the atmosphere in a carburi

1981-09-17

1984-03-13

Sheehan, John P.

Metallurgical apparatus

With control means responsive to sensed condition

With analyzer or computation means

266 83, 266 85, 266 88, 266251, C21B 724

Patent

active

044362897

ABSTRACT:
An automatic control for a multi-zone push type carburizing furnace capable of controlling the flow of either an endothermic gas atmosphere or a nitrogen methanol atmosphere at both high and low flow rates and during normal and suspend carburizing utilizes cascaded multi-stage valving to assure good separation of the atmospheres in adjacent zones. The first stage of the cascaded multi-stage valving controls the total gas flow, and the second stage routes the gas to individual zones of the furnace.

REFERENCES:
patent: 2449760 (1948-09-01), Bedford
patent: 2664283 (1953-12-01), Hess et al.
patent: 2754104 (1956-07-01), Hess
patent: 2872175 (1959-03-01), Guenzi
patent: 3128323 (1964-04-01), Davis
patent: 3565606 (1971-02-01), Carlson et al.
patent: 3999046 (1976-12-01), Porter
patent: 4003803 (1977-01-01), Schmidt-Balve
patent: 4238122 (1980-12-01), Snyder et al.

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