Refrigeration – Gas controller or director – Cooled gas directed relative to cooled enclosure
Patent
1974-11-22
1976-04-27
Wye, William J.
Refrigeration
Gas controller or director
Cooled gas directed relative to cooled enclosure
98 87, 98119, 62408, 1374938, F25D 1704
Patent
active
039525422
ABSTRACT:
The present invention includes a ventilator for use in equalizing pressures within and without an enclosure, such as a coldroom or the like. A heated valve assembly is situated within an enclosure wall opening such that it is freely exposed to both environmental and internal fluid air pressures. A fluid impervious wall formed with inlet and outlet ports therethrough is partially covered by inner and outer closure members, both of which are supported and keyed by a common rod or shaft. These closure members are each biased by a common helical spring toward sealed and closed positions in which the inlet and outlet ports are covered. Pressure differentials are equalized by displacement of at least one of said closure members, thereby permitting air flow through one of the respective ports. By preselecting the spring rate of the helical spring, the minimum forces required to displace the closure members are controlled and predetermined.
REFERENCES:
patent: 2132879 (1938-10-01), Pownall
patent: 2139991 (1938-12-01), Wingard
patent: 2527782 (1950-10-01), Williams
patent: 2820475 (1958-01-01), Hobbs
patent: 3004401 (1961-10-01), Mann
patent: 3359755 (1967-12-01), Creech
patent: 3813896 (1974-06-01), Lebalm
Kason Hardware Corporation
Sutton Paul J.
Wye William J.
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