Abstract: Improved three way valves comprise three openings aligned to directly connect with a corresponding series of ports and a selectively positionable seal that regulates the flow of a fluid within the valve. Improved fuel cells comprise a plurality of flow channels connected to at least one improved three way valve suitable for regulating fluid flow through the fuel cell. Generally, the flow channels comprise a series of ports, wherein the three way valve is configured to engage and disengage from the series of ports directly to form a manifold without the use of additional connectors, for example, tubes and/or hoses. Due to the fact that the three way valve can engage and disengage form the series of ports directly, potential leakage points in the fuel cell piping system can be reduced. In some embodiments, the three way valve comprises a central chamber having a selectively positionable seal, a bypass chamber and a through chamber.

Abstract: In one embodiment, a sight tube flowmeter is formed of a plurality of fluoropolymer components welded together to form a unitary flowmeter body. The components can comprise a PFA upright sight tube having two end portions, a flow conduit extending therethrough and two fitting portions that are uniquely welded onto each end of the sight tube, and a fluoropolymer float device movable to various positions within the flow conduit depending on the flow level of the fluid flowing therethrough. The float device can be of conventional design or for those flowmeter embodiments where low fluid flow rates are to be measured, an elongate float can be utilized. The floats and, in particular, a designated portion thereof, are visible through the sight tube to provide visual indication of the position, and thus the flow rate of fluid flowing through the flowmeter. In addition, alternative embodiments include the implementation of the unique sight tube and elongate float design in conventional flowmeters.