36 results about "Demand valves" patented technology

A portable positive pressure breathing apparatus includes a demand valve with a supply inlet port adapted to be connected to a pressurized source of oxygen and an outlet port adapted to be connected to the inlet of a patient's breathing appliance. The demand valve further includes a reference chamber and a valve assembly responsive to the reference chamber / appliance inlet pressure differential for connecting / disconnecting the inlet port to and from the outlet port. At least one manually adjustable back pressure regulator is connected to the pressure source and the reference chamber for setting the pressure in the reference chamber (and inlet to the breathing appliance) at a selected level above atmospheric pressure.

A face mask (10) mechanically coupled to a lung demand valve (LDV) (12). The face mask (10) comprises a main mask and an inner mask (15) which fits over the wearer's mouth and nose. The interior of the inner mask (15) is in fluidic communication with the interior of the main mask (10) by means of non-return valves (16). The interior of the main mask is in fluidic communication with an inlet port (18) which is mechanically and fluidically coupled to a supply port (20) of an LDV. The LDV (12) includes a diaphragm and a cover (44) which comprises three parts (44a, 44b) and (44c). Exhaled air is used to flush the space around the diaphragm. Thus, any toxic or undesirable gas in the vicinity of the diaphragm is pushed out to atmosphere by the exhaled air flowing past and around the diaphragm.

A cap is described for closing a liquid beverage container for allowing the beverage to be sucked out of the container through a spout, while preventing spillage when no suction takes place. A demand valve is incorporated into the cap, which has an inlet port communicating with the interior of the container, a discharge port communicating with the spout and a control port communicating with the ambient atmosphere through a hole in the cap. The valve has a valve seat and a closure element controlling the flow from the inlet port to the discharge port urged to move into an opening position in dependence on the excess of the control pressures over that in the discharge ports, this movement being in the direction opposed to the flow and urged by the pressure in the container in a direction to seal against the valve seat. In the invention, the demand valve is formed by two members that are mounted on the inner surface of the cap. The first member is rigid and defines the valve inlet port and the valve seat. The second member incorporates the valve closure element and a resilient membrane which includes the valve closure element and serves as a pressure sensitive diaphragm. The second member also seals against the first member, around the hole in the cap and around the spout.

A cap is described for closing a liquid beverage container for allowing the beverage to be sucked out of the container through a spout, while preventing spillage when no suction takes place. A demand valve is incorporated into the cap, which has an inlet port communicating with the interior of the container, a discharge port communicating with the spout and a control port communicating with the ambient atmosphere through a hole in the cap. The valve has a valve seat and a closure element controlling the flow from the inlet port to the discharge port urged to move into an opening position in dependence on the excess of the control pressures over that in the discharge ports, this movement being in the direction opposed to the flow and urged by the pressure in the container in a direction to seal against the valve seat. In the invention, the demand valve is formed by two members that are mounted on the inner surface of the cap. The first member is rigid and defines the valve inlet port and the valve seat. The second member incorporates the valve closure element and a resilient membrane which includes the valve closure element and serves as a pressure sensitive diaphragm. The second member also seals against the first member, around the hole in the cap and around the spout.

The present invention relates to a vacuum demand valve 50 for use on the exhalation side of a breathing apparatus 32 for controlling the flow of exhalation gases from a patient 34 to a vacuum line 36. The demand valve comprises: a housing 1, 14 having a housing inlet 2 which can be connected to an exhalation line 40 of a breathing apparatus to allow exhalation gases to flow into the housing from a patient and a housing outlet 3 which can be connected to a vacuum line to allow gases to flow from the housing into the vacuum line; a diaphragm 4 having a flexible skirt 4b connected to the housing and a rigid portion 4a supported by the flexible skirt and moveable in response to gas pressure in the housing; a sealing member 10 connected to the rigid portion of the diaphragm which can engage with the housing outlet to resist the flow of gases from the housing to the vacuum line; wherein in a first condition of the diaphragm, the pressure in the vacuum line causes the sealing member to engage the housing outlet for resisting flow of gases from the housing to the vacuum line and in a second condition of the diaphragm a predetermined pressure of exhalation gases in the housing acts on the rigid portion of the diaphragm causing the sealing member to disengage at least partially from the housing outlet allowing exhalation gases to flow from the housing to the vacuum line.

A diaphragm for a lung demand valve, including a CBRN layer which is sufficiently resistant to the permeation of at least some CBRN agents and a resilient layer which is resiliently deformable. The CRBN layer is arranged to restrict the permeation of at least some CBRN agents through the diaphragm, and the resilient layer is arranged to allow the diaphragm to be resiliently deformed.

Methods for easing the duration of pain experienced by patients during a cluster headache are disclosed including providing a high-pressure source of substantially pure oxygen, applying the oxygen to the patient so that inhalation by the patient is substantially limited to inhalation of the substantially pure oxygen, inhaling the substantially pure oxygen in order to cause hyperventilation by the patient, and continuing hyperventilation at least until the patient achieves respiratory alkalosis, hypocapnia hyperoxia, and until the pain is terminated. The method preferably includes using a demand valve having a predetermined manual purge flow rate and a variable output flow rate to the user based on respiratory demand.

The invention relates to a bogie for railway freight cars. The suspended foundation braking device is connected with the bolster of the bogie and the upper pull rod for transmitting the braking force, which reduces the unsprung mass of the bogie and is beneficial to improve the dynamics of the vehicle running. Performance: The brake shoe holder is hinged on the round shaft at the end of the brake beam. When the vehicle is braking, the brake shoe holder can rotate around the round shaft at the end of the brake beam, so that the brake shoe can better fit the wheel tread and improve the braking performance. performance; the suspended foundation braking device is suspended on the bogie bolster composition, when the vehicle brakes are relieved, the suspended foundation braking device is only subject to the frictional resistance when the pin shaft rotates, and the frictional resistance is relatively small , which is conducive to improving the braking relief performance; it can also meet the installation requirements of the empty-weight valve connecting branch pipe passing through the bolster; therefore, the railway freight car bogie has a simple structure, strong practicability, and is convenient for maintenance and repair; at the same time, it makes the vibration resistance Stable, high anti-diamond rigidity, and stable running performance.

There is disclosed a lung demand valve comprising: a body within which is disposed a diaphragm and a valve assembly having a valve inlet, the valve assembly and diaphragm arranged to cooperate to control the delivery of breathable gas to a user. There is also provided a breathable gas inlet fluidically connected to the valve inlet inside the body and arranged to be fluidically connected to a supply of breathable gas; and a whistle coupled to the body. The whistle has a whistle inlet fluidically connected to the breathable gas inlet inside the body and a whistle outlet disposed outside the body. In use, when the pressure of the breathable gas in the breathable gas inlet is less than a threshold, breathable gas flows from the breathable gas inlet through the whistle inlet and outlet thereby causing the whistle to sound outside of the body.

A breathing apparatus includes a compressed air source with a compressed air source valve, a breathing regulator with a pressure reducer and a demand valve, a breathing mask connected to the demand valve at a first inlet connector, a second air source, a switching mechanism having an actuating member for switching between the compressed air source and the second air source and an exhalation valve, on the breathing mask, movable between a higher internal pressure in a second operating state than in a first operating state. The actuating member is provided on the breathing regulator. The switching mechanism, upon being switching to compressed air breathing, activates the lung-governed demand valve and adjusts the exhalation valve to the second operating state. Upon switching to breathing via the second air source, the lung-governed demand valve is deactivated and the exhalation valve (30) is adjusted to the first operating state.

A diaphragm for a lung demand valve, including a chemical, biological, radiological and / or nuclear (CBRN) layer which is sufficiently resistant to the permeation of at least some CBRN agents and a resilient layer which is resiliently deformable. The CRBN layer is arranged to restrict the permeation of at least some CBRN agents through the diaphragm, and the resilient layer is arranged to allow the diaphragm to be resiliently deformed.

Device comprising a demand valve (1) for delivering breathable gas to a diver and a fluidic connector (2, 5) that can be selectively connected to the demand valve (1), the demand valve (1) comprising a breathable gas supply inlet (3, 13), characterized in that the demand valve (1) and / or the fluidic connector (2, 5) comprise a blocking device (6, 7, 8, 9; 6, 7, 66, 50) for selectively blocking the connector (2, 5) on the demand valve (1) when the connector (2, 5) is fastened to the demand valve (1) via the catching members (103, 12; 213, 5), the blocking device (6, 7, 8, 9; 7, 66, 50) being selectively moveable and / or deformable between a first configuration of blocking relative movement between the demand valve (1) and the connector (2, 5), and a second configuration of unblocking, allowing relative movement between the demand valve (1) and the connector (2, 5).

A prior art demand valve has been modified to make it more responsive to persons with impaired oxygen delivery by replacing its sensing diaphragm and associated mechanically actuated valve actuator with a solenoid activated proportional control valve coupled to an analog pressure transducer via a pulse width modulated current driver circuit. The pressure transducer responds to detected pressure changes in a patient's breathing tube.

The invention relates to a respirator with a compressed air source (2), with a compressed air source valve (4), a breathing regulator (6), which is connected to the compressed air source valve and which has a pressure reducer and a demand valve, a respirator mask (10), which is connected at a first inlet attachment (11) to the demand valve, a second air source (14), which can either be connected to a second inlet attachment (12) of the respirator mask or is connected to an attachment with direct connection to the demand valve, a switch mechanism (20, 22; 21, 22) with an actuator (20; 21) for switching between compressed-air breathing from the compressed air source via the demand valve or from the second air source, an exhalation valve (30) on the respirator mask, which exhalation valve (30) is adjustable between a first and a second operating state, the internal pressure in the respirator mask being higher in the second operating state than in the first operating state, wherein the actuator (20; 21) of the switch mechanism (20, 22; 21, 22) is provided on the breathing regulator (6), the switch mechanism being designed such that, when switched to compressed-air breathing, it activates the demand valve and sets the exhalation valve (30) to the second operating state and, when switched to breathing via the second air source (14), it deactivates the demand valve and sets the exhalation valve (30) to the first operating state.

A breathing apparatus includes a source of compressed air and a lung demand valve that receives compressed air from the source. A pneumatic valve assembly is connected between the source and the lung demand valve. The pneumatic valve assembly is moveable between a first closed position that prevents a flow of compressed air to the lung demand valve and a second open position that provides a path for compressed air to flow to the lung demand valve. A mask receives the lung demand valve therein. The mask provides the compressed air to a user and having a first operational mode providing filtered ambient air to the user and a second operational mode providing compressed air to the user. A control device is coupled to the pneumatic valve assembly. The control device detects a condition in the air surrounding the apparatus and controlling the pneumatic valve assembly to move between the first closed and second open position and the mask to operate in a respective one of the first and second operational modes.

A diaphragm for a lung demand valve, including a chemical, biological, radiological and / or nuclear (CBRN) layer which is sufficiently resistant to the permeation of at least some CBRN agents and a resilient layer which is resiliently deformable. The CRBN layer is arranged to restrict the permeation of at least some CBRN agents through the diaphragm, and the resilient layer is arranged to allow the diaphragm to be resiliently deformed.

A vacuum demand valve for controlling flow of exhalation gases from a patient to a vacuum line. The demand valve comprises: a housing having a housing inlet that allows exhalation gases to flow into the housing from a patient, and a housing outlet that allows gases to flow from the housing into the vacuum line; a diaphragm having a flexible skirt and a rigid portion moveable in response to gas pressure in the housing; a sealing member connected to the rigid portion to engage the housing outlet to resist the flow of gases from the housing to the vacuum line. In a first condition, the vacuum line pressure causes the sealing member to engage the housing outlet and in a second condition a predetermined pressure of exhalation gases in the housing causes the sealing member to disengage from the housing outlet.

A breathing apparatus includes a compressed air source with a compressed air source valve, a breathing regulator with a pressure reducer and a demand valve, a breathing mask connected to the demand valve at a first inlet connector, a second air source, a switching mechanism having an actuating member for switching between the compressed air source and the second air source and an exhalation valve, on the breathing mask, movable between a higher internal pressure in a second operating state than in a first operating state. The actuating member is provided on the breathing regulator. The switching mechanism, upon being switching to compressed air breathing, activates the lung-governed demand valve and adjusts the exhalation valve to the second operating state. Upon switching to breathing via the second air source, the lung-governed demand valve is deactivated and the exhalation valve (30) is adjusted to the first operating state.