Systems, apparatus, and methods for filtering air from a fluid line

An apparatus, comprising:

• a housing having a first end, a second end, and a cylindrical sidewall extending between the first end and the second end of the housing and having an inner surface defining a reservoir, the cylindrical sidewall configured to be deformed between an undeformed and a deformed configuration, the cylindrical sidewall having a constant thickness between the first end and the second end of the housing in the undeformed configuration;
• an upper cap coupled to the first end of the housing and defining an inlet;
• a lower cap coupled to the second end of the housing and defining an outlet;
• a valve seat having a first end, a second end, an outer surface extending between the first end and the second end, and a sealing surface, the valve seat being deformable, the valve seat defining a through-hole from the first end to the second end, the second end coupled to the lower cap such that the through-hole is in fluid communication with the outlet of the lower cap, the valve seat disposed within the housing such that the outer surface is surrounded by the inner surface of the housing, the valve seat having an outer diameter smaller than an inner diameter of the housing such that a circumferential gap is defined between the inner surface of the housing and the outer surface of the valve seat, the circumferential gap bounded on a lower end by the lower cap, the valve seat being formed of a first material and the housing being formed of a second material different from the first material;
• and
• a sealing member configured to float at a liquid fluid level within the reservoir and to seal with the sealing surface of the valve seat prior to the liquid fluid level within the reservoir decreasing below a minimum threshold fluid level, the sealing member configured to transition from a sealed configuration in which the sealing member is engaged with the sealing surface to an unsealed configuration in which the sealing member floats at the liquid fluid level when the liquid fluid level is above the minimum threshold fluid level in response to the cylindrical sidewall of the housing being flexed to the deformed configuration to contact and deform the valve seat to disrupt a seal between the sealing member and the sealing surface.