A low-flow alarm optionally having a variable pressure pre-set threshold, for use with protective suits and hoods is disclosed. In one embodiment, a low-flow valve alarm comprises an adjustable spindle handwheel having a hole, a valve body having an air inlet port, the valve body connected with the adjustable spindle handwheel, a hollow handwheel body joined to the adjustable spindle handwheel, a diaphragm sealing collar joined to a whistlehead retaining body, the whistlehead retaining body having a central bore and joined with a whistlehead, a resilient diaphragm joined with a control spindle disposed within the central bore of the whistlehead retaining body, the control spindle having an air channel, wherein air can travel through the air channel, wherein air flow is adapted to act on the resilient diaphragm, compressing a spring and wherein a low air pressure condition relaxes compression on the spring, producing an audible alarm.

A low-flow alarm optionally having a variable pressure pre-set threshold, for use with protective suits and hoods is disclosed. In one embodiment, a low-flow valve alarm comprises an adjustable spindle handwheel having a hole, a valve body having an air inlet port, the valve body connected with the adjustable spindle handwheel, a hollow handwheel body joined to the adjustable spindle handwheel, a diaphragm sealing collar joined to a whistlehead retaining body, the whistlehead retaining body having a central bore and joined with a whistlehead, a resilient diaphragm joined with a control spindle disposed within the central bore of the whistlehead retaining body, the control spindle having an air channel, wherein air can travel through the air channel, wherein air flow is adapted to act on the resilient diaphragm, compressing a spring and wherein a low air pressure condition relaxes compression on the spring, producing an audible alarm.

A reusable, elastomeric respirator and ventilator, with filter inserts, including a mask body having a pliant facial interface on the interior of the mask body, and two apertures centrally positioned on the front face of the mask body. Two interchangeable plugs or ports are provided to be received within and seal the apertures, deliver oxygen into the mask, or deliver liquids to a wearer of the mask. On opposing sides of the mask body are air filter housings which support an air filter, each air filter housing including a base support structure affixed to the mask body and a top securing structure removably secured to the base support structure. One or more straps are affixed to the mask body to secure the mask body about a wearer's head.

The present invention relates to an exhaust apparatus for releasable or permanent connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation valve. The exhaust apparatus comprising a powered blower in fluid connection with the at least one exhalation valve, the blower being operable to draw a portion of the wearer's exhaled breath through the at least one exhalation valve. Using such an exhaust apparatus for releasable connection to a personal protection respiratory device improves the comfort and overall experience for respirator wearers who use the respirator for intensive work, and/or for long periods of time, and/or in hot and humid environmental conditions by removing the heat and moisture build-up inside the respirator.

A bayonet connector (112, 128) suitable for connecting a filter cartridge (72) or an air supply tube to a respirator (10, 14). The bayonet connector (112) has a tubular male part (112) and a female part. The male part has a tube (114) with two or more lugs (130, 132) formed on it, which engage with engaging ribs (136, 138) located on an interior sidewall of the female part (128), or vice versa. The lugs (130, 132) and their corresponding engaging ribs (136, 138) are located at different axial positions.

A bayonet connector (112, 128) suitable for connecting a filter cartridge (72) or an air supply tube to a respirator (10, 14). The bayonet connector (112) has a tubular male part (112) and a female part. The male part has a tube (114) with two or more lugs (130, 132) formed on it, which engage with engaging ribs (136, 138) located on an interior sidewall of the female part (128), or vice versa. The lugs (130, 132) and their corresponding engaging ribs (136, 138) are located at different axial positions.

A ducted breathing apparatus and methods for assembling and using such ducted breathing apparatus are provided. The ducted breathing apparatus may include a face cover for sealing at least a portion of a user's face. The ducted breathing apparatus may include a ducted air channel element for providing direct air flow from a user's mouth within the mask to the outside environment. The ducted breathing apparatus may include a coupling element for providing a sealed mating connection between the ducted air channel element and the face cover.

A ducted breathing apparatus and methods for assembling and using such ducted breathing apparatus are provided. The ducted breathing apparatus may include a face cover for sealing at least a portion of a user's face. The ducted breathing apparatus may include a ducted air channel element for providing direct air flow from a user's mouth within the mask to the outside environment. The ducted breathing apparatus may include a coupling element for providing a sealed mating connection between the ducted air channel element and the face cover.

In some embodiments, the present disclosure provides a method to process high pressure air into low pressure breathing air for one or more sealing and locking helmets and/or one or more air respirators. Other embodiments include a system configured to perform such a method and a manufacturing process of making such a system. In some embodiments, the breathing system automatically fills a local reserve bottle by pressure equalization. In this regard, the secondary supply bottles will fill the backup bottle when the console module operator (CMO) connects the secondary air supply to the system. The backup bottle will then be isolated from depletion during normal operation by means of a check valve to prevent back flow of the emergency cylinder into the secondary air supply. The local reserve bottle will protect against loss of air on any of the high pressure air hoses.

In some embodiments, the present disclosure provides a method to process high pressure air into low pressure breathing air for one or more sealing and locking helmets and/or one or more air respirators. Other embodiments include a system configured to perform such a method and a manufacturing process of making such a system. In some embodiments, the breathing system automatically fills a local reserve bottle by pressure equalization. In this regard, the secondary supply bottles will fill the backup bottle when the console module operator (CMO) connects the secondary air supply to the system. The backup bottle will then be isolated from depletion during normal operation by means of a check valve to prevent back flow of the emergency cylinder into the secondary air supply. The local reserve bottle will protect against loss of air on any of the high pressure air hoses.