A valve apparatus 1 for a pressure-actuated system has a pressure medium input 7 and a pressure medium output 22. A relay valve 8 controls the pressure medium input 7. A pressure-actuatable inlet valve 23 is arranged between the relay valve 8 and the pressure medium output 22. Each pressure medium output 22 includes a pressure-actuatable outlet valve 28 controlling a fluidic connection of the pressure medium output 22 to a purge 16 leading to atmosphere. At least one outlet valve 28 or inlet valve 23 is formed as a diaphragm valve and has a valve diaphragm 29 which lies on a valve seat 30 and opens against the pressure in a purge chamber 31. For each diaphragm valve, an electrically actuatable purge valve 33 controls a fluidic connection of the purge chamber 31 to a purge line controlling the relay valve 8.

A noise reduction device for a negative pressure line of a brake booster is provided. The improved noise reduction device is disposed in a vacuum hose, and includes a negative pressure line of a vehicle in which a brake booster and a surge tank of an engine are connected via the vacuum hose to use negative pressure of the surge tank. In particular, noise caused by pulsation of an air flow and vibration of a valve which occur due to an operation of an engine piston is reduced.

Noise attenuation units are disclosed that are connectable in a system as part of a fluid flow path. Such units include a housing defining an internal cavity and having a first port and a second port each connectable to a fluid flow path and in fluid communication with one another through the internal cavity, and a noise attenuating member seated in the internal cavity of the housing within the flow of the fluid communication between the first port and the second port. The noise attenuating member enables the fluid communication between the first port and the second port to flow through the noise attenuating member.

A damping member (100) for a pneumatic valve (205) of a pneumatic system (201) of a vehicle (200a), in particular a utility vehicle (200b), is adapted to be mounted to an air outlet section (210) of the valve (205) which is used for exhausting pressurized air (220). The damping member (100) is adapted for damping sound emission of the pressurized air (220) and includes a scaffold structure (105). The scaffold structure (105) is adapted to damp the sound emission of the pressurized air (220) by conducting the air (220) through the scaffold structure (105).

Check valve units having one or more sound attenuating members are disclosed. A check valve unit includes a housing defining an inlet port, an outlet port, and a chamber in fluid communication therewith thereby defining a flow path from the inlet port through the chamber to the outlet port. The chamber includes first and second valve seats and has a sealing member disposed therein that is moveable from a position seated on the first valve seat to a position seated on the second valve seat. A sound attenuating member is disposed in the flow path downstream of the chamber, within the chamber, or both. In another embodiment, the check valve unit includes a Venturi portion in fluid communication with the chamber. The Venturi portion has a fluid junction with the flow path downstream of the chamber or forms the discharge section of the Venturi portion thereby defining the outlet port.

A silencer fitting element for a silencer of a pneumatic component or a pneumatic system for a vehicle is provided. The silencer fitting element includes including a baffle plate, a gas guiding structure extending from the baffle plate and is configured to guide gas exiting several gas passages provided in the baffle plate, and further includes a thread for mounting the silencer fitting element. The gas guiding structure is configured to guide the gas over a guiding distance from the second baffle plate surface. The guiding distance is different for at least one first gas passage of the several gas passages and at least one second gas passage of the several gas passages.

A noise damper for compressed air systems, in particular for brake systems of utility vehicles, including at least one fibre mesh roll unit having at least two mesh density regions, at least one inlet, at least one outlet, and a housing, in which the at least one fibre mesh roll unit is accommodated within the housing of the noise damper to dampen noise emissions of air flowing through from the at least one inlet to the at least one outlet. Also described is a method for producing a fibre mesh roll unit for a noise damper for compressed air systems, in particular for brake systems of utility vehicles.

A noise damping fiber for a noise damper for compressed air systems, in particular for brake systems of utility vehicles, has surface grooves formed by surface treatment. A method for producing a noise damping fiber mesh, includes the steps of: forming thermoplastic fibers by a molding tool or an extruding tool; surface treating of the fibers by the molding tool, the extruding tool, or another tool configured to treat the surface of thermoplastic fibers; and knitting, braiding or weaving a plurality of the surfaced treated fibers into a noise damping fiber mesh.

In a hydraulic supply apparatus, one or more fitting grooves are formed along the outer circumferential surface of a ball nut, and corresponding fitting protrusions are formed on the inner circumferential surface of a damper coupled to the ball nut. This configuration minimizes damper movement, thereby reducing vibration and noise caused by collision with a bushing member during axial movement of the ball nut.

An air cleaner assembly comprises a filter element and a housing assembly. The filter element comprises a filter media for filtering a fluid and a first endcap positioned along a first end of the filter media and through which a first filtered air flow portion flows. The housing assembly at least partially contains the filter element and comprises a cover that defines a first outlet through which the first filtered air flow portion flows to a downstream device. The cover comprises a noise reduction device that receives the first filtered air flow portion and dissipates sound waves traveling upstream from the downstream device.