A powered air purifying respirator and method of operating the same. The powered air purifying respirator comprises a fluid moving device. The fluid moving device comprises an outlet, an airflow sensor retaining member located proximate to the outlet, and an airflow sensor engaged with the airflow sensor retaining member.

A powered air purifying respirator and method of operating the same. The powered air purifying respirator comprises a fluid moving device. The fluid moving device comprises an outlet, an airflow sensor retaining member located proximate to the outlet, and an airflow sensor engaged with the airflow sensor retaining member.

A respirator includes a frame, a filter layer, and a face seal member. The frame has an outer side and an inner side. The frame defines an opening therethrough. The filter layer is mounted to the outer side of the frame and covers the opening of the frame. The filter layer is configured to prohibit permeation of aerosol, gas, and/or vapor contaminants therethrough. The face seal member is mounted to the inner side of the frame. The face seal member includes a seal contact area configured to engage a facial surface of a wearer. The face seal member incorporates a phase change material therein. The phase change material is configured to provide localized cooling by absorbing heat emitted by the wearer.

A respirator includes a frame, a filter layer, and a face seal member. The frame has an outer side and an inner side. The frame defines an opening therethrough. The filter layer is mounted to the outer side of the frame and covers the opening of the frame. The filter layer is configured to prohibit permeation of aerosol, gas, and/or vapor contaminants therethrough. The face seal member is mounted to the inner side of the frame. The face seal member includes a seal contact area configured to engage a facial surface of a wearer. The face seal member incorporates a phase change material therein. The phase change material is configured to provide localized cooling by absorbing heat emitted by the wearer.

A self-contained breathing apparatus includes an air cylinder pressurized to about 5500 psig, wherein the air cylinder is compatible with infrastructure used in conjunction with the air cylinder. The self-contained breathing apparatus also includes a first regulator valve for reducing air pressure from the air cylinder to a predetermined level. A second regulator valve is also provided for reducing the air pressure from the predetermined level to a level suitable for use by an operator, wherein air is supplied from the second regulator valve to the operator via a mask. The self-contained breathing apparatus further includes a frame for supporting the air cylinder on the back of the operator. Other embodiments are described and claimed.

A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.

Disclosed is a fluid unidirectional flow structure. The fluid unidirectional flow structure (100) comprises; a first flow-checking body (110) and a second flow-checking body (120); the first flow-checking body (110) comprises a first connection portion (111) that is interconnected with a first flow portion (112) having at least one first through-hole (113); the second flow-checking body (120) comprises a second connection portion (121) interconnected with a second flow portion (122) having at least one second through-hole (123); when a fluid reverses directions, at least part of the first flow portion (112) moves relative to at least part of the second flow portion (122). The fluid unidirectional flow structure (100) may be designed in any shape, so as to facilitate installation. Also disclosed are a check assembly, and a respiratory device, when used on a breathing passageway, the invention may be adapted to a respiratory passageway of any size and shape. The fluid unidirectional flow structure (100) may also be installed on the body of a respiratory isolation mask (1000), wherein the shape of said mask may be adapted to the shape of the face of a person or animal. The shape of the first flow-checking body (110) and of the second flow-checking body (120) may be configured to be adaptable, so as to better bring into play the function and utility of the fluid unidirectional flow structure.

Disclosed is a fluid unidirectional flow structure. The fluid unidirectional flow structure (100) comprises; a first flow-checking body (110) and a second flow-checking body (120); the first flow-checking body (110) comprises a first connection portion (111) that is interconnected with a first flow portion (112) having at least one first through-hole (113); the second flow-checking body (120) comprises a second connection portion (121) interconnected with a second flow portion (122) having at least one second through-hole (123); when a fluid reverses directions, at least part of the first flow portion (112) moves relative to at least part of the second flow portion (122). The fluid unidirectional flow structure (100) may be designed in any shape, so as to facilitate installation. Also disclosed are a check assembly, and a respiratory device, when used on a breathing passageway, the invention may be adapted to a respiratory passageway of any size and shape. The fluid unidirectional flow structure (100) may also be installed on the body of a respiratory isolation mask (1000), wherein the shape of said mask may be adapted to the shape of the face of a person or animal. The shape of the first flow-checking body (110) and of the second flow-checking body (120) may be configured to be adaptable, so as to better bring into play the function and utility of the fluid unidirectional flow structure.

A mask structure with an externally connected filtering device includes a mask body, a unidirectional air seat valve, at least one connecting tube and a filtering device. The mask body is made of an air-impermeable material, can be provided with the unidirectional air seal valve thereon and connected with the filtering device through the connecting tube, so that the mask structure can filter and purify ambient air by the filtering device, and deliver the filtered air to the inner side of the mask body through the connecting tube for a user to inhale. The exhaled air by the user can be expelled through the unidirectional air seal valve to the outer side of the mask body.

A mask structure with an externally connected filtering device includes a mask body, a unidirectional air seat valve, at least one connecting tube and a filtering device. The mask body is made of an air-impermeable material, can be provided with the unidirectional air seal valve thereon and connected with the filtering device through the connecting tube, so that the mask structure can filter and purify ambient air by the filtering device, and deliver the filtered air to the inner side of the mask body through the connecting tube for a user to inhale. The exhaled air by the user can be expelled through the unidirectional air seal valve to the outer side of the mask body.