Pneumatically amplified conservation valve

Details Pneumatically amplified conservation valve Pneumatically amplified conservation valve

1984-08-17

1986-03-11

Scott, Samuel

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 28, 251 33, 251 43, 12820426, 12820524, 137908, 137489, 137494, F16K 31385

Patent

active

045750424

ABSTRACT:
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.

REFERENCES:
patent: 2480712 (1949-08-01), Carbon
patent: 3300176 (1967-01-01), Hatch, Jr.
patent: 3456669 (1969-07-01), Lloyd
patent: 3537448 (1970-11-01), Liston
patent: 4054133 (1977-10-01), Myers
patent: 4278110 (1981-07-01), Price et al.
patent: 4457340 (1984-07-01), Krueger

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