Abstract: A dust cover receiving structure of a hydraulic shock absorber in which a seat rubber is interposed between a suspension spring and a spring seat. The seat rubber has a spring receiving portion which is arranged between the suspension spring and the spring seat, a centering portion which is fitted to a damper tube and guides an end portion of a dust cover in such a manner as to align the dust cover with an axial center of the damper tube, and a cover receiving portion which is provided between the spring receiving portion and the centering portion, and which receives an end surface of the dust cover.

Abstract: A dust cover receiving structure of a hydraulic shock absorber in which a sheet rubber is interposed between a suspension spring and a spring sheet. The sheet rubber has a spring receiving portion which is arranged and clamped between the suspension spring and the spring sheet, a centering portion which is fitted to a damper tube and guides an end portion of a dust cover in such a manner as to align the dust cover with an axial center of the damper tube, and a cover receiving portion which is provided between the spring receiving portion and the centering portion, and which receives an end surface of the dust cover.

Abstract: A method of treating raw water containing phosphorous and nitrogen compounds and organic matter in which the raw water is passed through an aerobic zone containing a porous material. Anaerobic treatment is carried out in the presence of a hydrogen donor. The porous material is tobermorite and/or xonotlite with a porosity of 50% to 90% and is produced by foaming and hardening a silica-based material, a lime-based material and water, and subjecting the porous material to hydrothermal synthesis. The order of the aerobic and anaerobic treatments may be varied.