Nippon Pillar Packing Co., Ltd.

Yu Notoji

Kazukiyo Teshima

Toshihide Iida

Hiroki Tanabe

Shingo Higuchi

Kenji Onishi

Shohei Minamihara

A fitting body is tubular, whose first and second axial end portions include a connector for a tube and an annular groove, respectively. A sleeve has first and second axial end portions including an annular protrusion and a connector for another tube, respectively. A nut is engaged with an external thread of the fitting body or the sleeve. Engagement of the external thread with the nut causes press-fit of the annular protrusion into the annular groove to form a seal region. Under a condition that a depth of the annular groove is three or more times as large as a thickness of a radially inward or outward wall of the annular groove, an axial distance from the seal region to a bottom of the annular groove exceeds ten times an increment width of the annular groove caused by the press-fit of the annular protrusion into the annular groove.

Tube fitting

A rolling diaphragmof a rolling diaphragm pumphas a movable portionreciprocatable together with a piston, a fixed portionfixed to a housing, and a thin film portionconnecting the movable portionand the fixed portionand bending due to reciprocation of the piston. A rubber layeris overlaid on the thin film portionwithout being adhered to the thin film portion, an end portionon the movable portionside of the rubber layeris fixed to the piston, and an end portionon the fixed portionside of the rubber layeris fixed to the housing

Rolling diaphragm pump

Growing community of inventors

Osaka, Japan

Yu Notoji