Abstract

There is provided a powerless back-flow prevention apparatus comprising: a body having a sewage inlet at a front thereof, a sewage outlet at a rear thereof, and a length-wise sewage channel there between; a door pivotally coupled to the body at the rear thereof to open or close the outlet, wherein the door comprises: a number of floating members arranged spacedly with each other; and a guide disposed on the floating members to pivot upwards via the floating force to close the outlet, and to pivot downwards via a gravity in an absence of the sewage back-flow to open the outlet, and, then to guide the sewage from the outlet.

IPC Classes  ?

• E03F 5/042 - Arrangements of means against overflow of water, backing-up from the drain
• E03F 7/04 - Valves for preventing return flow
• F16K 15/03 - Check valves with guided rigid valve members with a hinged closure member
• F16K 31/22 - Operating meansReleasing devices actuated by fluid actuated by a float actuating a lift valve with the float rigidly connected to the valve
• F16K 31/28 - Operating meansReleasing devices actuated by fluid actuated by a float actuating a lift valve with two or more floats actuating one valve

Abstract

The present invention relates to a non-powered backflow prevention apparatus, provided at a sewer, a sluice of an agricultural waterway and the like so as to prevent the backflow of sewage without power, and comprises: a body part having a through-hole in which an inlet through which the sewage flows is disposed at the front thereof and an outlet through which the sewage is discharged is disposed at the rear thereof; and an opening and closing door part rotatably hinge-coupled to one side of the outlet of the body part so as to open and close the outlet of the body part, wherein the opening and closing door part can comprise: a plurality of buoyant members generating buoyancy by means of the sewage flowing backwards toward the outlet of the body part, and arranged to have a predetermined gap therebetween; and a guide part disposed above the plurality of buoyant members so as to close the outlet of the body part by means of the buoyancy of the buoyant members and to guide, to the outlet of the body part, the sewage flowing from the inlet of the body part when the sewage flowing backwards is removed such that the outlet of the body part is opened by the load itself of the opening and closing door part.

IPC Classes  ?

• E03F 5/042 - Arrangements of means against overflow of water, backing-up from the drain
• E03F 7/04 - Valves for preventing return flow
• F16K 15/02 - Check valves with guided rigid valve members