Abstract: A system includes a closed-circuit respirator (1) with a breathing mask (2), a closed breathing circuit, which leads from the breathing mask via an exhalation tube (3), a lime cartridge (4) for binding CO2, a spring-loaded breathing bag (5) and an inhalation tube (7) to the breathing mask. A pressurized oxygen tank (11) is connected to the circuit via a constant dispensing unit (8) and to the breathing bag via a minimum flow control valve (9), which opens upon a collapse of the breathing bag (lack of breathing gas in the circuit) and fills the breathing bag from the oxygen tank. A pressure sensor (12) detects the pressure in the oxygen tank. A constant dispensing unit introduces oxygen with a volume lower than a mean oxygen volume demand. A monitoring device (13-15) calculates a quantity of oxygen consumed and still remaining from the detected pressure and an initial pressure value.

Abstract: A gas mask and breathing equipment is provided with a circuit for breathing gas and with a heat exchanger (7) cooled by an evaporating agent. The evaporating agent is introduced from an evaporating agent container (8) into the heat exchanger (7) via at least one group of spraying elements (9) and a gas delivery means (11) allows a gas volume flow to flow through the heat exchanger (7).

Abstract: A directional valve for a respirator product shall be improved with regard to a low flow resistance. To accomplish the object, two diaphragm-like valve disks (12, 13) abutting against one another at a central line of separation (16) that are attached to the valve housing (11) in a point-like manner and can be moved in a flap-like manner by the breathing gas stream are provided. A central web (19) at the valve housing (11), which runs along the line of separation (16) and support webs (21) additionally arranged on both sides, is used as a valve seat.

Abstract: A gas mask and breathing equipment is provided with a circuit for breathing gas and with a heat exchanger (7) cooled by an evaporating agent. The evaporating agent is introduced from an evaporating agent container (8) into the heat exchanger (7) via at least one group of spraying elements (9) and a gas delivery means (11) allows a gas volume flow to flow through the heat exchanger (7).