Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents
Patent
1971-10-12
1976-07-13
Cohan, Alan
Fluid handling
Diverse fluid containing pressure systems
Fluid separating traps or vents
137204, F16T 114
Patent
active
039688127
ABSTRACT:
The specification discloses drain valve apparatus for automatically draining condensed moisture from tubing, such as tubing connected to a respirator or nebulizer, without admitting ambient air to the tubing. One embodiment of drain valve apparatus comprises a casing of transparent plastic material having a chamber from which condensed moisture flows to atmosphere. A diaphragm valve, of the bulb-type, is biased to seated position to prevent admittance of ambient air to the tubing and opens only responsively to a certain weight of accumulated moisture active thereon to allow moisture to enter the chamber. In a second embodiment, a diaphragm valve is activated to seated position by a second bulb-type diaphragm connected thereto and subject to the pressure in the tubing. Also, a check valve prevents back flow of ambient air to the tubing under negative pressure conditions in the tubing.
REFERENCES:
patent: 2496470 (1950-02-01), Hodsdon
patent: 2610645 (1952-09-01), Wagner
patent: 2859764 (1958-11-01), Golay
patent: 2907340 (1959-10-01), Kenney
patent: 3608574 (1971-09-01), Beaussant
Cohan Alan
Instrumentation Industries, Inc.
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