Warning signal device for respirators

Signals and indicators – Alarms – Fluid-pressure variation

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Details

12820222, 137557, G01L 1912

Patent

active

043501150

ABSTRACT:
A warning signal device for a respirator. An alarm device is connected to a precontrol chamber and is activated to sound or show an alarm when pressure rises in the precontrol chamber. A first valve member is movable and separates a high pressure gas supply chamber from a medium pressure chamber. A first valve seat is positioned between the medium pressure chamber and the precontrol chamber which is closed by the first valve member when gas pressure in the high pressure gas supply chamber is above a threshold value. A second valve member is movable between the precontrol and the control chambers. A second valve seat is positioned between the medium pressure chamber and the precontrol chamber and closable by the second valve member. A throttle passage is defined in the second valve member which, with the second valve seat open, communicates the precontrol and control chambers and, with the second valve seat closed, communicates the medium pressure chamber with the control chamber. A sealing pressure piston is movably mounted in the first valve member and abuts the second valve member to hold the second valve seat open when there is sufficiently high pressure in the high pressure gas supply chamber. With insufficient pressure in the high pressure gas supply chamber, the sealing pressure piston releases the second valve member which then closes the second valve seat.

REFERENCES:
patent: 3611981 (1971-10-01), Warncke
patent: 3785333 (1974-01-01), Warncke
patent: 4064899 (1977-12-01), Lehmann
patent: 4116156 (1978-09-01), Draxler
patent: 4249473 (1981-02-01), Pasternack
patent: 4275723 (1981-06-01), Warncke

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