Abstract: An improved vacuum hose includes an axial vacuum conduit having outer linear buttresses integral with the conduit and arranged radially around the conduit; the buttresses are strengthened by substantially orthogonal ribs. Buttresses and ribs are imbedded in a matrix of flexible plastic which provides support and increases the collapse resistance of the conduit; the whole assembly is covered by a tough casing which may be a separate component or a treated surface of the matrix material.

Abstract: A pulsation dampener or desurger for use in sterile or other high-temperature applications such as food- or pharmaceutical-processing plants has an outer case surrounding a concentric perforated mandrel. Flanges or other connectors provide for attachment to a piping system so that product flows through the mandrel. Enclosing the mandrel is a liner of polytetrafluoroethylene or other fluoropolymer; the liner in turn is enclosed by a resilient sheath which may be integral with the liner. Between the liner and the mandrel is a pressure chamber which fluctuates in volume responsive to surges in line pressure, dampening the amplitude of the surges. Expansion of liner and sheath is limited by pressure within a gas chamber in the region between sheath and case.