A device may include a base plate and a deformable diaphragm having a first surface, where the first surface includes a textured surface. The device may also include a fluid chamber defined between the base plate and the deformable diaphragm, with the fluid chamber being in fluidic connection with the fluid reservoir and with the inflatable member. The device may also include a piezoelectric element having a second surface, the first surface of the deformable diaphragm and the second surface of the piezoelectric element being adhesively attached, the piezoelectric element being operable to repeatedly change a volume of the fluid chamber by deforming the deformable diaphragm to pump fluid from the reservoir to the inflatable member.

A journal bearing for a gear driven pump includes a bearing body having a bearing body circular opening that defines a bearing surface along a length of the bearing body and a face plate adjacent to the bearing surface. The bearing surface is configured to carry a gear shaft load through a hydrodynamic fluid film pressure between a load surface of a gear shaft and the bearing surface. The bearing surface is formed from a leaded bronze material and the face plate is formed from a copper-nickel alloy.

A compressor of an embodiment includes a compression mechanism part that compresses a refrigerant in a sealed container. The compression mechanism part includes Cr and includes a first member and a second member which slidingly move relative to each other. The first member has a chromium layer and a nitride layer formed on a base member surface in this order. The nitride layer includes CrN and TiN. Carbide is deposited on a surface of the second member.