초록 ▼

A pneumatically amplified conservation valve controls a flow of gas, such as oxygen, to a hospital patient. A sense tube monitors pressure variations as a result of exhalation by the user. The exhalation pressure variation deflects a diaphragm which closes a check valve that serves to vent gas throu

A pneumatically amplified conservation valve controls a flow of gas, such as oxygen, to a hospital patient. A sense tube monitors pressure variations as a result of exhalation by the user. The exhalation pressure variation deflects a diaphragm which closes a check valve that serves to vent gas through a bleed port. When the check valve closes the bleed gas is restricted in a chamber which deflects the diaphragm which in turn drives a connector that pushes a plunger to close a port that is connected to the source of gas through a supply tube. The gas is normally supplied through the supply tube and a normally open pneumatic valve to an output tube and then to the user. The pneumatically amplified conservation valve provides gas to the user except when the user is exhaling thereby substantially saving the amount of gas that must be provided to a user.

대표청구항 ▼

A pneumatically amplified conservation valve for controlling gas flow from a supply tube to a user through an output tube in response to gas pressure variations received through a sense tube, the valve comprising: a normally open pneumatically controlled valve which is closed in response to a pressu

A pneumatically amplified conservation valve for controlling gas flow from a supply tube to a user through an output tube in response to gas pressure variations received through a sense tube, the valve comprising: a normally open pneumatically controlled valve which is closed in response to a pressure increase in a first chamber, said pneumatically controlled valve having the input thereof connected to said supply tube and the output thereof connected to said output tube, a passage for providing fluid communication between said supply tube and said first chamber, a pneumatically controlled check valve to permit fluid flow from said first chamber to a bleed port, said check valve closed in response to a pressure increase in a second chamber which is connected to said sense tube, whereby a pressure increase received through said sense tube closes said check valve such that gas received through said passage pressurizes said first chamber to close said pneumatically controlled valve to stop the supply of said gas to said output tube, said pneumatically controlled check valve including a ball, a plate which serves as a wall of said first chamber, said plate having a conical orifice therethrough for receiving said ball for permitting the flow of said gas only out of said first chamber, a diaphragm closing said second chamber, said diaphragm deflected by gas pressure received through said sense tube, and a piston connected to said diaphragm facing said ball for forcing said ball to close said conical orifice when said diaphragm is deflected toward said ball.