| 摘要 |
A valve for a body orifice is a tube formed of a flexible polymer with an inlet fixed across the orifice and an outlet away from the orifice. A flange is about the inlet to interface with the orifice. A passage in the tube extends from the inlet along an axis. A wall of the tube is between the inlet and the outlet and has a barrel shape tapered to the inlet and the outlet and wider therebetween. The wall extends between an inside and an outside. A hinge about the tube is in the wall at the barrel shape. The hinge is an area of preferential bending so the tube is either a barrel or flipped with the outlet folded about the hinge into the passage. The outlet has holes through the wall with each in a plane substantially normal to the axis and away from the inlet and axially beyond the hinge. A seat within the tube is on the inside of the wall in the passage to engage the outlet when the tube is flipped into the passage by bending the hinge acutely as the outlet is moved along the axis to the inlet and against the seat. The outlet surrounds a bottom of the tube and when flipped the bottom moves axially into the passage locating the holes in the seat with the bottom closing the inlet. A duct in the inlet surrounds it so the duct, the flange and the tube have fluid communication with the orifice. The tube is circular and symmetrical with its axis and the inlet and outlet are substantially normal to the axis. The outlet has a grip projecting therefrom for use in pulling and flipping the hinge to open the passage between the inlet and outlet. A method of making the valve has steps of forming the tube of a flexible material, having the inlet placed across the orifice and an outlet away from the orifice, locating the flange about the inlet to interface about the orifice, extending the passage through the tube from the inlet along the axis, having the wall on the tube to taper toward the inlet and the outlet, locating the hinge about the tube and in the wall for bending so the tube is either normally barrel shaped or flipped with the outlet folded about the hinge into the passage, locating the seat inside the wall to engage the outlet when the tube is flipped by bending the hinge acutely so the outlet is moved along the axis toward the inlet and holds against the seat. A method of using has the step of flipping the tube by bending the hinge acutely so the outlet is moved toward the inlet and held against the seat. The method of using has the step of unfolding the acutely bent hinge by pressurizing the seat at the inlet to unseal the outlet or pressing about the hinge to flip the outlet from the seat.
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