Disclosed herein is a structural drain trap for preventing spread of pathogens between floors, which has an improved structure in which it includes a cover and an outer chamber that are easily coupled to and decoupled from each other and provides a drain line configured to have a double structure at inner and outer portions thereof. Therefore, it is possible to prevent pathogens such as Coronavirus as well as odors or pests from flowing backward as much as possible, and thus to prevent pathogens from spreading through the gap between the floors of buildings such as apartments.

A valve device includes: a hollow member having a through-hole with an axis, an internal surface delimiting the through-hole, a peripheral surface delimiting the hollow member's transverse extent with respect to the axis, and at least one deformation zone deformable to reduce the transverse extent when compression forces act on the peripheral surface, the deformation of the deformation zone moving the hollow member from a rest to a use state, and at least one closure portion extending radially from the hollow member inside the through-hole up to a respective free edge, in contact with the internal surface of the hollow member and/or with at least one free edge of another closure portion occluding the through-hole when in use. The at least one closure portion includes a flexible membrane, foldable when subjected to a fluid and/or solid pressure which moves in the through-hole along the axis, thereby defining a passage.

The present disclosure provides an apparatus for preventing offensive odors for a drain port, the apparatus including: a plate that is formed in a plate shape so that it can be stably attached to the upper part of a drain manhole, and has a through hole formed in the center; a drain pipe that is connected to the through hole in the lower direction of the plate, is bent laterally from the lower direction, and has a shape in which an end is cut diagonally; and a shielding film that is connected by a hinge to the end of the drain pipe, is opened by rainwater or sewage discharged from the drain pipe, or is closed by a load. With such a configuration, a drain pipe is formed to guide rainwater, and a shielding film that is opened by rainwater or closed by a load is provided at the end part of the drain pipe, thereby preventing offensive odors generated from the drain port and also preventing insects from flowing into the drain port.

The present disclosure provides an apparatus for preventing offensive odors for a drain port, the apparatus including: a plate that is formed in a plate shape so that it can be stably attached to the upper part of a drain manhole, and has a through hole formed in the center; a drain pipe that is connected to the through hole in the lower direction of the plate, is bent laterally from the lower direction, and has a shape in which an end is cut diagonally; and a shielding film that is connected by a hinge to the end of the drain pipe, is opened by rainwater or sewage discharged from the drain pipe, or is closed by a load. With such a configuration, a drain pipe is formed to guide rainwater, and a shielding film that is opened by rainwater or closed by a load is provided at the end part of the drain pipe, thereby preventing offensive odors generated from the drain port and also preventing insects from flowing into the drain port.

A drain insert is described that provides a valve that prevents backflow of objects and materials through the drain inlet and which has an internal wall with a convex curvature. This convex curvature, which can be elliptical, provides improved fluid flow rates relative to straight walled, cylindrical configurations, permitting small diameter drains to utilize the drain insert while meeting IAPMO flow rate requirements.

A drain lock sealing apparatus is positioned in a drain pipe for being locked therein and further for sealing the pipe to prevent odors and vermin from coming from the drainpipe into the room. The apparatus includes a grate positioned over the drain pipe, a resiliently deformable sealing ring extending from the grate into the drainpipe, an rigid expander member with an inwardly tapered outer surface extending into the sealing ring, a resiliently deformable frusta-conical member attached to center hub of the expander member so that the peripheral closure edge of the frusta-conical member is in non-fixed normally closed relationship against the circumferential edge of the expander member so that the closure edge opens in response to liquid passing through the grate into the drain and resumes normally close relationship in response to the secession of liquid passing through the grate. A bolt extends through the grate and cylindrical sealing ring and is screwed into the axial hole whereby tightening of the bold compresses the sealing ring axially to deform the cylindrical sealing ring radially into clamping engagement against the interior surface of the drain pipe.

A drain insert is described that provides a valve that prevents backflow of objects and materials through the drain inlet and which has an internal wall with a convex curvature. This convex curvature, which can be elliptical, provides improved fluid flow rates relative to straight walled, cylindrical configurations, permitting small diameter drains to utilize the drain insert while meeting IAPMO flow rate requirements.

A drain pot includes a body and at least one flexible catch. The body has an inlet and an outlet. The inlet and the outlet are at opposing ends of the body and in fluid communication with each other. The at least one flexible catch extends from and is disposed around the body.

The present invention discloses a self-adjustable gas isolator, including a floater, a liquid storage device, a liquid outlet, a cover plate, a liquid discharging hole and a pressure balancing device. The floater has a pressure relief port; the pressure balancing device is connected with the floater in fixed position; the floater is sleeved in the liquid storage device and the floater goes up and down along with liquid level in the liquid storage device. The sealing device regulates the opening degree between the floater and the liquid outlet automatically according to the liquid volume discharged, and the pressure balancing device releases gas pressure preventing liquid from discharging, and the discharging speed of liquid is fast. The self-adjustable gas isolator is simple in structure, no components for hooking sundries in its channel, and is not easy to jam. When discharging liquid, the floater swings or rotates with self-cleaning function.

A drain pot includes a body and at least one flexible catch. The body has an inlet and an outlet. The inlet and the outlet are at opposing ends of the body and in fluid communication with each other. The at least one flexible catch extends from and is disposed around the body.