초록 ▼

A curtain valve has a valve chamber having a pair of opposed walls with an inlet port through one wall and an outlet port through the other wall. A valve member has a tension band supported on opposite ends thereof in a valve body with the band being looped around a pair of rollers forming a pair of

A curtain valve has a valve chamber having a pair of opposed walls with an inlet port through one wall and an outlet port through the other wall. A valve member has a tension band supported on opposite ends thereof in a valve body with the band being looped around a pair of rollers forming a pair of bights which partially encircle the rollers. The tension band is perforated on the end portion which overlies the inlet port. A stem is connected to one of the rollers and extends from the valve body for displacing the rollers and moving the tension band to cover and uncover the outlet port thereby closing and opening the valve.

대표청구항 ▼

A valve comprising: (a) a valve body with inlet and outlet passageways and a valve chamber therebetween; (b) said valve chamber having a pair of opposed walls with an inlet port communicating from said inlet passageway through one of said walls and an outlet port through the other one of said walls

A valve comprising: (a) a valve body with inlet and outlet passageways and a valve chamber therebetween; (b) said valve chamber having a pair of opposed walls with an inlet port communicating from said inlet passageway through one of said walls and an outlet port through the other one of said walls communicating to said outlet passageway; (c) a valve member including an elongated flexible tension band and a pair of rollers with said tension band having opposed end portions thereof secured to said valve body, said tension band lying on facing surfaces of both of said opposed walls and looped into a pair of bights which partially encircle said rollers; (d) said facing surfaces of said opposed walls being spaced apart a distance less than the sum of the diameters of said rollers plus three times the thickness of said tension band; (e) said tension band having an aperture therethrough in the portion which contacts the wall having said inlet port, said tension band being continuous and imperforate in the portion which contacts the wall having said outlet port; and (f) means to displace said rollers operable from the exterior of said valve body such that said tension band continuous portion can be positioned over said outlet port to close the valve, and such that said tension band continuous portion can be positioned to uncover at least a portion of said outlet port to permit at least a limited fluid flow through said valve.