US 10,441,826 B2 · Airflow control valve

Abstract

An airflow control valve (20) for use in a breathing apparatus (10) to control a flow of air from a pressurized air supply to a respirator. The valve comprises an inlet port (31) for connection to a pressurized air supply, and first (32) and second (33) outlets. The valve is configurable between a first position in which the inlet port is in restricted fluid communication with the first outlet to allow a restricted flow of air from the inlet port to the first outlet and in which the second outlet is sealed from the inlet port and, a second position in which the inlet port is in substantially unrestricted fluid communication with the second outlet to allow an unrestricted flow of air from the inlet port to the second outlet.

Claims29

Dependent claims

An airflow control valve for use in a breathing apparatus to control a flow of air from a pressurized air supply to a respirator, wherein the airflow control valve comprises:

a valve housing defining a piston chamber;
a piston received within the piston chamber, comprising a hollow bore that runs through the piston;
an inlet port for connection to a pressurized air supply, and
first and second outlets, wherein the airflow control valve is configurable between:
a first position in which the inlet port is in restricted fluid communication with the first outlet to allow a first flow of air from the inlet port, via the hollow bore of the piston, to the first outlet and in which the second outlet is sealed from the inlet port and,
a second position in which the inlet port is in fluid communication with the second outlet to allow a second flow of air from the inlet port, via the hollow bore of the piston, to the second outlet, and wherein the first flow of air is more restricted than the second flow of air.

3 more elements

Dependencies are inferred from the claim text.

Airflow control valve

Life of this patent

Airflow control valve

Life of this patent

Abstract

Claims29