Two-way vent cap for controlled atmosphere furnace

Details Two-way vent cap for controlled atmosphere furnace Two-way vent cap for controlled atmosphere furnace

1987-07-28

1988-09-13

Favors, Edward G.

Furnaces

With safety means

110163, 110173B, 126293, F23N 524

Patent

active

047701080

ABSTRACT:
A vent cap for a heat treating furnace provides bidirectional pressure relief. The cap is weighted and balanced over the furnace vent such that the vent is closed as long as the furnace has a slightly positive internal pressure. If the internal pressure exceeds a preselected upper limit the cap opens the vent to relieve the overpressure. The vent cap has a controlled inlet which opens to equalize the pressure differential if the internal pressure falls below a preselected lower limit below the ambient pressure outside the furnace. Such controlled equalization prevents the formation of undesirable combustible mixtures of air and treating gas in the furnace.

REFERENCES:
patent: 3123028 (1964-03-01), Bodeker
patent: 3957001 (1976-05-01), Round
patent: 4329967 (1982-05-01), Levenberg
patent: 4497310 (1985-02-01), Funke

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