초록 ▼

A pressure sensitive valve for a positive pressure airway system which allows bi-directional flow with low resistance. When positive pressure from the air generator of the positive pressure airway system is lost, a spring actuated disc moves away from its compressed position to block the outlet of t

A pressure sensitive valve for a positive pressure airway system which allows bi-directional flow with low resistance. When positive pressure from the air generator of the positive pressure airway system is lost, a spring actuated disc moves away from its compressed position to block the outlet of the air generator. By blocking the outlet of the air generator, the path of entry for contaminants is significantly restricted in so doing, an alternate, low resistance path to atmosphere is exposed to allow contaminants to escape.

대표청구항 ▼

[ What is claimed is:] [1.] A pressure sensitive flow control valve comprising:a valve body;a supply port defined in a first portion of said valve body;an outlet port defined in a second portion of said valve;at least one exhaust port defined in a third portion of said valve body; anddirecting means

[ What is claimed is:] [1.] A pressure sensitive flow control valve comprising:a valve body;a supply port defined in a first portion of said valve body;an outlet port defined in a second portion of said valve;at least one exhaust port defined in a third portion of said valve body; anddirecting means disposed within said valve body for controlling a flow of gas through said valve body based on a pressure of gas at said supply port and said outlet port relative to atmospheric pressure outside said valve body such that:(1) as long as said pressure of gas at said supply port and said outlet port are greater than said atmospheric pressure by a predetermined amount, said directing means permits gas to flow from said supply port to said outlet port, provided there exists a pressure differential therebetween, and permits gas to flow from said outlet port to said supply port, provided there exists a pressure differential therebetween, and blocks said at least one exhaust port so that substantially no gas flows therethrough, and(2) if said pressure of gas at said supply port and said outlet port are not greater than said atmospheric pressure by said predetermined amount, said directing means permits substantially all gas entering said valve body through said outlet port to exit said valve body through said at least one exhaust port, thereby substantially preventing elements from passing through said valve body from said outlet port to said supply port.