Variable pressure and flow control for a pneumatically-operated gas demand apparatus

摘要

Pneumatically operated gas demand equipment coupled in interruptible fluid communication between a recipient and a source of pressurized respiratory gas and adapted for controlling delivery of the pressurized gas to the recipient as the recipient inhales and exhales. The equipment includes a supply valve and a sensing valve cooperable to intermittently deliver pressurized gas to the recipient responsive to the recipient's inhalation and exhalation. A regulator mechanism is disposed between and in fluid communication with the pressurized gas source and the supply valve. The equipment additionally includes a control device for controlling flow of pressurized gas from the pressurized gas source to the supply valve and from the pressurized gas source to the regulator mechanism. The control device also controls the pressure of pressurized gas discharged by the regulator mechanism.