Personal air sampling pump assembly

An apparatus comprising:

• a housing;
• a fluid inlet formed in the housing;
• a fluid outlet formed in the housing;
• a piston within the housing;
• a valve head;
• a first diaphragm operably coupled to a first end of the piston, the first diaphragm at least partially enclosing a first fluid chamber, the first fluid chamber having a first fluid chamber air outlet, wherein the first diaphragm is coupled to the valve head;
• and
• a second diaphragm operably coupled to a second end of the piston, the second diaphragm at least partially enclosing a second fluid chamber having a second fluid chamber air outlet, wherein:
• while the piston moves in a first direction:
• the first diaphragm is configured to cause air to move into the first fluid chamber through a first check valve at a first aperture in the first fluid chamber, and
• the second diaphragm is configured to cause air to move out of the second fluid chamber via the second fluid chamber air outlet through a second check valve at a first aperture in the second fluid chamber;
• and
• while the piston moves in a second direction:
• the first diaphragm is configured to cause air to move out of the first fluid chamber via the first fluid chamber air outlet through a third check valve at a second aperture in the first fluid chamber, and
• the second diaphragm is configured to cause air to move into the second fluid chamber through a fourth check valve at a second aperture in the second fluid chamber;
• and
• a damper membrane portion having a damper membrane coupled to the valve head to which the first diaphragm is also coupled, the damper membrane portion at least partially enclosing a damper fluid chamber, wherein air that moves out of both of the first fluid chamber and the second fluid chamber moves through the third check valve into the damper fluid chamber.

An apparatus comprising:

• a housing having an air inlet and an air outlet;
• a piston;
• a valve head;
• a first diaphragm connected to a first end of the piston, the first diaphragm at least partially enclosing a first fluid chamber, the first fluid chamber having a first fluid chamber air outlet, wherein the first diaphragm is coupled to the valve head;
• and
• a second diaphragm connected to a second end of the piston, the second diaphragm at least partially enclosing a second fluid chamber having a second fluid chamber air outlet, wherein:
• while the piston moves in a first direction:
• the first diaphragm is configured to cause air to move into the first fluid chamber, and
• the second diaphragm is configured to cause air to move out of the second fluid chamber via the second fluid chamber air outlet;
• and
• while the piston moves in a second direction:
• the first diaphragm is configured to cause air to move out of the first fluid chamber via the first fluid chamber air outlet, and
• the second diaphragm is configured to cause air to move into the second fluid chamber;
• and
• a damper membrane portion having a damper membrane coupled to the valve head to which the first diaphragm is also coupled, the damper membrane portion at least partially enclosing a damper fluid chamber, wherein the damper fluid chamber is fluidly connected to both of the first fluid chamber air outlet and the second fluid chamber air outlet, wherein air that moves out of both of the first fluid chamber and the second fluid chamber air outlet moves into the damper fluid chamber.

An apparatus comprising:

• a housing;
• a fluid inlet formed in the housing;
• a fluid outlet formed in the housing;
• a piston within the housing;
• a valve head;
• a first diaphragm operably coupled to a first end of the piston, the first diaphragm at least partially enclosing a first fluid chamber, wherein the first diaphragm is coupled to the valve head;
• and
• a second diaphragm operably coupled to a second end of the piston, the second diaphragm at least partially enclosing a second fluid chamber, wherein:
• while the piston moves in a first direction:
• the first diaphragm is configured to cause air to move into the first fluid chamber through a first check valve at a first aperture in the first fluid chamber, and
• the second diaphragm is configured to cause air to move out of the second fluid chamber through a second check valve at a first aperture in the second fluid chamber;
• and
• while the piston moves in a second direction:
• the first diaphragm is configured to cause air to move out of the first fluid chamber through a third check valve at a second aperture in the first fluid chamber, and
• the second diaphragm is configured to cause air to move into the second fluid chamber through a fourth check valve at a second aperture in the second fluid chamber;
• and
• a damper membrane portion having a damper membrane coupled to the valve head to which the first diaphragm is also coupled, the damper membrane portion at least partially enclosing a damper fluid chamber, wherein air that moves out of the first fluid chamber moves through the third check valve into the damper fluid chamber,
• wherein the housing forms a third fluid chamber fluidly connected to the fluid inlet and a fourth fluid chamber fluidly connected to the fluid outlet, and
• wherein the first aperture in the first fluid chamber and the second aperture in the second fluid chamber fluidly connect the third fluid chamber to both the first fluid chamber and the second fluid chamber.