Valve device

Claim 1

A valve device for discharging a fluid enclosed in a chamber; including an outer pipe having an interior por-tion which in use of the device communicates in fluid-tight manner with the interior of said chamber; a first opening being provided in said outer pipe and communicating said interior por-tion with the exterior of said outer pipe; a hollow valve member attached to an inclined surface of the exterior of said outer pipe in such a manner that said first opening is normally closed by said valve member; an inner pipe fixed to an inner surface of said outer pipe; an elastic first non-return valve attached to said inner pipe in such a manner that a second open-ing provided in said inner pipe is normally closed by said first non-return valve; an elastic bulb pump having said first non-return valve associated therewith; and an elastic second non-return valve provided in a wall of said bulb pump; wherein said valve member is adapted to be rolled up on itself along said outer pipe into a ring-shaped configuration against the slope of said inclined surface whereby said opening is exposed to permit discharge of said fluid, said valve member being formed of an elastic material whereby the valve member normally resists being rolled up on itself and the rolled valve member is elastically and automatically restored by its elastic force to its original state extending along said inclined surface so as to close said opening when rolling force is removed, said chamber comprises an envelope connected to said outer pipe, said envelope being adapt-ed to elastically expand and contract, in use said bulb pump is repeatedly expanded and contracted to force said fluid from said bulb pump into said outer pipe through said first non-return valve to expand said chamber in such a manner that said first non-return valve is forcibly opened by the fluid pressure re-sulting from said bulb pump being contracted and is closed by its own elasticity to close said second opening and that said second non-return valve enables external fluid to be sucked into said bulb pump when the pressure on said bulb pump is re-leased such that said bulb pump expands by its own elasticity, and said envelope contracts by the action of its elastic force so that said fluid in said envelope is discharged through said outer pipe and said first opening when said valve member is rolled up whereupon said first opening will be exposed.