Ventilator for coldroom with pressure responsive valves

Details Ventilator for coldroom with pressure responsive valves Ventilator for coldroom with pressure responsive valves

1983-03-02

1985-02-19

Chambers, A. Michael

Fluid handling

With heating or cooling of the system

With electric heating element

1374939, F16K 17194

Patent

active

044999178

ABSTRACT:
A ventilator for a coldroom with pressure responsive valves wherein a first valve plate becomes free from a partition wall so as to open a first valve port when internal pressure is increased, and a second valve plate becomes free from said partition wall so as to open a second valve port when internal pressure is reduced. Electric heaters are disposed at supporting rib portions between said respective valve ports and at outer peripheral portions of said valve ports or in the vicinity of those portions, thereby to heat contact portions of said valve plates with said partition wall. The ventilator can be precisely and susceptively operated in response to changes of internal pressure without fear of malfunction due to freezing.

REFERENCES:
patent: 2704085 (1955-03-01), Bieger et al.
patent: 4091837 (1978-05-01), Edmunds et al.
patent: 4180093 (1979-12-01), Kamezaki

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