Breathing apparatus

A lung demand valve suitable for use in a self contained breathing apparatus, in which fluid for breathing is conveyed to a user on inhalation, the lung demand valve comprising:

• a first fluid path,
• a second fluid path,
• a flexible diaphragm, separating the first and second fluid paths, and wherein the second fluid path is open to the atmosphere.

A cover suitable for use on a lung demand valve for a self contained breathing apparatus, in which fluid for breathing is conveyed to a user on inhalation, in which the lung demand valve comprises:

• a first fluid path, and
• a diaphragm, enclosing at least a part of the first fluid path,
• wherein the cover provides the lung demand valve with a second fluid path, so that the first and second fluid paths are separated by the diaphragm, and the second fluid path is open to the atmosphere, and wherein exhaled fluid is directed along the second fluid path to the diaphragm.