Abstract: Control valve (10) for a user-donnable breathing device selectively switches from a normal breathing oxygen source to a pressurized emergency bottle. A valve body (12) has a normal oxygen source inlet and also an emergency source inlet for oxygen flow to the user of the device when donned. A poppet (30) permits normal source oxygen flow into the valve body (12), normally keeping a piston (32) in a spring-biased cocked position spaced from a seal of the emergency bottle. A user-operated release permits the poppet to move to a position for blocking the normal source inlet but allowing the piston to become uncocked and so be driven by spring force to pierce the emergency bottle seal. Only emergency breathing oxygen from the bottle then flows to the user for emergency breathing. The device can be an escape hood for an aircraft passenger.

Abstract: Control valve (10) for a user-donnable breathing device for selectively switching from a normal breathing oxygen source to a pressurized emergency bottle. The valve (10) has a valve body (12) with a normal source inlet and a normal oxygen supply fitting, an emergency source inlet, and a delivery outlet for oxygen flow to the user of the device when donned. A poppet (30) permits normal source oxygen to flow into the valve body (12) and then out of the delivery outlet. The poppet (30) in its normal position maintains a piston (32) in a spring-biased cocked position. When the piston (32) is released from its cocked position, it causes rupturing of a seal (104) of the emergency bottle. A user-operated release permits the poppet (30) to move to a flow blocking position, blocking the normal source inlet and allowing the piston (32) to be driven for piercing the emergency bottle. Emergency breathing oxygen then flows for user emergency breathing in the device, which may be an escape hood for an aircraft passenger.

Abstract: A compact gas flow control valve has a valve body having an inlet for receiving gas pressure, to provide gas at a substantially constant delivery pressure to be delivered by the gas flow control valve, and an outlet for delivery of the gas. Flow rate of the delivered gas is controlled by a rotor. A flow control plate covering the rotor has a plurality of orifices produced by one of various processes including mechanical drilling, laser drilling, piercing, punching, and selective etching. A selector mechanism orients the rotor to permit flow only through a selected one of said orifices at such delivery pressure for delivery by the outlet. The orifices define a preselected schedule of different flow rates determined by the diameter of the respective orifices.

Abstract: A compact gas flow control valve has a valve body having an inlet for receiving gas pressure, to provide gas at a substantially constant delivery pressure to be delivered by the gas flow control valve, and an outlet for delivery of the gas. Flow rate of the delivered gas is controlled by a rotor. A flow control plate covering the rotor has a plurality of orifices produced by one of various processes including mechanical drilling, laser drilling, piercing, punching, and selective etching. A selector mechanism orients the rotor to permit flow only through a selected one of said orifices at such delivery pressure for delivery by the outlet. The etched orifices define a preselected schedule of different flow rates determined by the diameter of the respective orifices. The control valve is positioned by a shaft and flow control knob having a positive detent mechanism for preventing stable orientation in a position other than for selected flow control.

Abstract: A compact gas flow control valve has a valve body having an inlet for receiving gas pressure, to provide gas at a substantially constant delivery pressure to be delivered by the gas flow control valve, and an outlet for delivery of the gas. Flow rate of the delivered gas is controlled by a rotor. A flow control plate covering the rotor has a plurality of orifices produced by one of various processes including mechanical drilling, laser drilling, piercing, punching, and selective etching. A selector mechanism orients the rotor to permit flow only through a selected one of said orifices at such delivery pressure for delivery by the outlet. The etched orifices define a preselected schedule of different flow rates determined by the diameter of the respective orifices.

Abstract: A compact, regulated gas flow control valve includes a valve body having a clamp for securement to a high pressure gas cylinder. An inlet at one end receives the high pressure gas from the cylinder. A piston-actuated regulator drops the high pressure to a low pressure, maintaining the low pressure at a substantially constant delivery value. An outlet and a flow control selector knob are located at the other end of the valve body. The knob selects a preselected flow rate for delivery of the low pressure gas by the outlet. The knob controls position of a rotor carrying a plurality or precalibrated flow control orifice inserts, the knob being rotatable but with positive detenting for orienting the rotor to permit flow only through a selected one of the orifice inserts for delivery by said outlet. The sequence of orifice inserts defines a preselected schedule of different flow rates upon rotation of the said selector knob.