Abstract: A vacuum waste-water system sound-absorber includes a connection stub for a vacuum waste-water system and an aspiration air duct, wherein the aspiration air duct is radially delimited by a pipe, wherein the pipe is delimited at an interior of the aspiration air duct by an internal wall and is delimited at an exterior of the aspiration air duct by an external wall, wherein the internal wall comprises openings in a radial direction, wherein the external wall comprises openings in radial direction, wherein a sound-absorbent material is arranged between the internal wall and the external wall.

Abstract: A vacuum waste-water system sound-absorber includes a connection stub for a vacuum waste-water system and an aspiration air duct, wherein the aspiration air duct is radially delimited by a pipe, wherein the pipe is delimited at an interior of the aspiration air duct by an internal wall and is delimited at an exterior of the aspiration air duct by an external wall, wherein the internal wall comprises openings in a radial direction, wherein the external wall comprises openings in radial direction, wherein a sound-absorbent material is arranged between the internal wall and the external wall.

Abstract: A marine muffler comprises an elongate cylindrical housing having an inlet and an outlet and defining an internal volume partitioned, by an angularly disposed internal baffle, into a lower chamber in communication with the inlet and an upper chamber in communication with the outlet. A vertically disposed duct is insertably secured to the baffle to allow exhaust gas and exhaust cooling water to flow from the lower inlet chamber to upper outlet chamber. The exhaust duct may preferably be further adapted with internal structure forming a plurality of individual flow conduits or passages. The duct is preferably positioned such that a plurality of flow passage inlets are positioned in proximity to the lower cylindrical housing wall, with flow passage outlets positioned in proximity to the upper housing wall. The lower duct wall may further be adapted with sidewall apertures for improving exhaust flow dynamics therethrough.

Abstract: A cooling tower sound attenuation apparatus having at least one sheet. The sheet has an upper and lower end and a first substantially straight region and a second region that is connected to the first substantially straight region. The apparatus additionally has a liquid collection basin along with a support structure that supports the sheet such that the lower end of the sheet is proximate to the liquid collection basin.

Abstract: A noise-reducing engine enclosure for an engine includes first and second members removably mounted to one another in cooperating relation to define an engine receiving space therebetween. The first and second members each include a noise-reducing layer of material to reduce noise transmission to the atmosphere outside of the engine enclosure during operation. The first and second members are movable between (1) an engine accessing position, wherein the first and second members are positioned to allow access to the engine during operation and (2) an engine enclosing position, wherein the first and second members cooperate to define the engine receiving space to receive and enclose the engine therein such that noise transmission to the atmosphere during operation is reduced.

Abstract: There is provided a silent-operating device for feeding water into a tank, in particular for filling a lavatory flush tank; the silencing effect is achieved by feeding the water through a chamber housing flow deflecting members; the members are perforated members arranged successively and spaced apart in the flow direction inside the chamber, and have respective numbers of through holes; the holes of consecutive members being offset with respect to one another to define a labyrinth path, i.e. a number of winding coil-like or zigzag paths, inside the chamber.

Abstract: A lavatory flush tank silent-operating fill device has a silencer extending along an axis and through which a stream of water flows; a number of channels are defined inside the silencer by a bundle of substantially straight, parallel tubes housed inside the silencer and parallel to the axis, and into which the stream of water is divided; and the flow section of the channels is such that flow of the water inside is substantially laminar.

Abstract: An exhaust system is provided with a structure that separates water from an exhaust stream and also attenuates the noise of the exhaust system. Water laden exhaust is directed from an inlet conduit through a perforated surface to precipitate water from the water laden exhaust stream. After the water is precipitated out of the exhaust stream, the gaseous portion of the exhaust stream continues from the inlet chamber 24 to an outlet chamber 28 and exits from the housing structure by passing through a first outlet conduit. The precipitated water passes from the housing structure through a second outlet conduit.

Abstract: A pressure pulsation absorbing device adapted to be connected between a pair of piping flanges includes a cup-shaped silencer box having a central inner bore for fluid flow therethrough, and a plurality of water stop bosses integrally formed with the silencer box around the inner bore and through which piping bolts are to be inserted. An elastic cylindrical body is provided in the silencer box around the water stop bosses to thereby divide the inside space of the silencer box into a radially inward fluid flow section and a radially outward dry section. A plurality of threaded bosses are integrally formed with the silencer box in the dry section for receiving bolts for fixing a side plate covering a side opening in the dry section. A slight clearance is provided respectively between outer surfaces of the water stop bosses and an inner circumference of the cylindrical body, and between outer surfaces of the threaded bosses and an outer periphery of the cylindrical body.

Abstract: A toilet refill valve is described for refilling a water closet after each flushing, which produces minimal noise during the refill process. The valve includes a valve device which can open to pass water to a vertical outlet tube that empties into the bottom of the water closet. An anti-siphon air tube near the top of the outlet tube has an upper end open to the atmosphere and a lower end facing downwardly along the outlet tube. A restriction in the outlet tube below the air tube, causes water to fill the outlet tube and at least the bottom of the air tube for a water inlet pressure of at least 20 psi. The water at the bottom of the air tube prevents air from being dragged into the downwardly facing air tube, to avoid the noise that would result from such air flowing through the air tube and bubbling out of the bottom of the outlet tube.

Abstract: A device to create such turbulence in water normally held motionless in a toilet that splashing and spattering is suppressed when solids, liquids, or both are inserted in a traditional manner. This device includes a submerged, motor driven rotor which when rotated rapidly causes the desired hydraulic turbulence. Appropriate switches are provided to accommodate the various ways in which a toilet is operated. A mounting bracket for hanging the device on any given toilet is provided. This same bracket also permits adjustment of the rotor's height to achieve proper submersion. A power cord is provided for connecting the splash suppressor to an electrical power source. A fluid resistant housing is provided for the motor and switches. This same housing extends from the motor to form a housing for the submerged rotor.

Abstract: The phonic deadening device comprises a cylindrical sleeve (5) with double walls, made of an elastic material and the axial traversing opening of which serves for the passage of the flux of the liquid. Both walls of this sleeve define between them an empty annular space (6), which is closed in a tight manner by an annular sealing element (7). This element further serves to position and to maintain the sleeve in a service position in the conduit.

Abstract: A silencer attached to a toilet cistern float valve or the like includes damping elements disposed between two cavities with ports communicating between the two cavities. A cylinder beneath a lower one of the two cavities communicates therewith through an apertured partition wall while the lower cavity includes a water outlet disposed at a level above that of the ports leading to the lower cavity to eliminate any air gap during refilling of the cistern. After refilling, water in the lower cavity drains through the apertured partition wall into the cylinder, the latter of which includes a bottom opening providing a siphon-breaking air gap.

Abstract: A vacuum suction type urinating aid comprises a urine transport tube connected, at one end, with a urine receiver provided with a urine suction opening to be applied to a urinating region, and connected, at the other end, with a urine tank communicating to a vacuum suction device. The vacuum suction device is provided with a partition and support plate around a motor mounted with an impeller, to fit the motor by the support plate to a casing forming an air passage. The suction and the delivery side of the air passage communicate through the impeller. The casing is internally provided with plural silencing partition plates at the suction side and the delivery side of the air passage to divert the air current passing therethrough.

Abstract: A flow controller, for limiting total maximum water flow through a domestic flow appliance, is provided by a molded flexible body shaped to provide a deformable central flow orifice and an outermost sealing section that is adapted to be operatively positioned at the joint between a supply conduit and the flow appliance, such as a showerhead, aerator, or the like. Associated with the flow controller are: (1) an annular tubular support for positioning the portion of the flexible body with the deformable central flow orifice upstream of the sealing section, and (2) a cavitation noise reducer located immediately downstream of said central flow orifice. The cavitation noise reducer has specific construction features for use with specific appliances, and may also be provided with a downstream tubular flow straightener, or simulator, of selected length and width dimensions to effectively develop a frictional effect that reduces undesirable sound that normally accompanies use of a flow controller.