Abstract: A nebulizer has an aerosol generator, a reservoir, and an aerosol outlet. A piezoelectric vibration generator is on a downstream side of a support washer, and power to the piezo is provided by a spring contact assembly. The assembly has upstanding electrical terminals for contact with electrical supply conductors. There are spring terminals extending around a rim of the spring contact assembly to engage an exposed underside of the washer, and a resilient ridge extending in the upstream direction to engage the underside of the piezo, which itself is on the downstream side of the washer.

Abstract: A nebulizer has an aerosol generator mounted in a housing, and has a vibratable aperture plate mounted to an annular support and to which is attached a vibration generator piezo. A downstream annular resilient seal is mounted between the housing and the washer on a side of the aperture plate opposed to the liquid supply reservoir. An upstream resilient seal is in the form of a gasket and is mounted between the washer and the housing reservoir, and has an opening forming part of a throat over the aperture plate. The gasket has a washer-shaped body extending radially from a downstream-extending rim adjacent the aperture plate. There are two upwardly-directed ridges for engagement with a housing surface, and the gasket is configured so that when under axial compression the opening internal surface is tapered inwardly in a flow direction to form a funnel shape.

Abstract: A nonreturn valve includes a first tube connection housing and a second tube connection housing and a diaphragm disk between the first and second tube connection housings. The disk can be lifted from an annular valve seat upon an overpressure in an inlet channel and can be pressed onto the valve seat upon an overpressure in an outlet channel. The diaphragm disk has an annular bead received in mutually opposite annular grooves of the tube connection housings. The diaphragm disk is provided, radially outside the valve seat, with openings leading to an outlet chamber. The second tube connection housing lying opposite the openings is provided with recesses which communicate with the outlet channel and are separated from each other by supporting surfaces for the diaphragm disc. The recesses are connected to the outlet channel by narrow deep grooves.

Abstract: A check valve in particular for medical applications has a first hose connecting casing and a second hose connecting casing and a membrane disk configured between the two hose connecting casings. The membrane disk is made of a resilient material and cooperates with an annular valve seat. The membrane disk is fitted radially outside the valve's seat with apertures leading to a discharge space. The wall of the second hose connecting casing is opposite the apertures and fitted with a surface curved away from the membrane toward the discharge channel. The discharge channel is fitted with an intake mouth in the wall, and conically tapers within a transition segment toward the intake mouth. Recesses communicating with the discharge space are fitted into the transition segment and are dimensioned in a way to substantially compensate the different flow cross-sections between the intake mouth and the discharge channel.

Abstract: Nonreturn valve, in particular for medical uses, with a first tube connection housing and a second tube connection housing and, arranged between the two tube connection housings, a diaphragm disc which is made of flexible material and which can be lifted from an annular valve seat when there is an overpressure in an inlet channel and can be pressed onto the valve seat when there is an overpressure in an outlet channel. At its outer peripheral area, the diaphragm disc is provided with an annular bead which is received in mutually opposite annular grooves of the tube connection housings. The diaphragm disc is provided, radially outside the valve seat, with openings leading to an outlet chamber, and the wall of the second tube connection housing lying opposite the openings is provided with recesses which communicate with the outlet channel, are separated from each other by supporting surfaces for the diaphragm disc and are connected to the outlet channel by narrow deep grooves.

Abstract: A check valve in particular for medical applications has a first hose connecting casing and a second hose connecting casing and a membrane disk configured between the two hose connecting casings. The membrane disk is made of a resilient material and cooperates with an annular valve seat. The membrane disk is fitted radially outside the valves seat with apertures leading to a discharge space. The wall of the second hose connecting casing is opposite the apertures and fitted with a surface curved away from the membrane toward the discharge channel. The discharge channel is fitted with an intake mouth in the wall, and conically tapers within a transition segment toward the intake mouth. Recesses communicating with the discharge space are fitted into the transition segment and are dimensioned in a way to substantially compensate the different flow cross-sections between the intake mouth and the discharge channel.

Abstract: A check valve is provided, including a first hose connector housing defining an entry passage extending into an entry space at least partially defined by an annular valve seat, a second hose connector housing coupled with the first hose connector housing and defining an exit passage, and a generally flexible perforated membrane disk positioned between the first and second hose connector housings such that the membrane disk selectively engages the valve seat.

Abstract: A check valve is provided, including a first hose connector housing defining an entry passage extending into an entry space at least partially defined by an annular valve seat, a second hose connector housing coupled with the first hose connector housing and defining an exit passage, and a generally flexible perforated membrane disk positioned between the first and second hose connector housings such that the membrane disk selectively engages the valve seat.