A valve assembly includes a valve body defining an internal region, an inlet passageway, and an outlet passageway, wherein the inlet and outlet passageways fluidly communicate with the internal region. A valve seat is positioned within the internal region defining a fluid passageway. A hanger is connected to the valve body. A linkage assembly is pivotally and rotatably to the hanger and a valve member is pivotally connected to the hanger via the linkage assembly, wherein the valve member is movable between an open configuration, in which fluid flow is permitted through the fluid passageway, and a closed configuration, in which the valve member engages the valve seat to at least partially restrict fluid flow through the fluid passageway.

An anti-rat flap member for sewer/draining pipe check is removably attached to the valve body. The valve body defines an interior volume therein which is preferably substantially open and unobstructed (except for the flap member). The flap member acts both as a seal to prevent the back-flow of sewage/drainage water and is normally in a closed position to prevent the passage of rats. The flap member comprises a row of sharp projections attached by known means (such as integrally molded, glued, rivetted or screwed) to the outermost side of the flap member facing the downstream section of the valve. The projections must be at an angle to the surface of the sheet, preferably at an angle which will prevent the rodent from gnawing and biting or even lifting the flap member with their mouth.

A valve assembly includes a valve body that defines an internal flow passageway between an inlet and an outlet, and a valve seat disposed in the valve body with a sealing surface perpendicular to the flow passageway. The valve assembly further includes a clapper pivotally correlated to the valve seat having a closed configuration extending across the valve seat configured to substantially close off the flow passageway, and an open configuration configured to substantially allow fluid flow in the flow passageway from the inlet to the outlet through the valve body. An annular valve seat seal is disposed within an annular groove formed in a surface of the valve seat, where the annular valve seat seal is disposed at an interface between the valve seat and the clapper when the clapper is in the closed configuration.

A valve assembly includes a valve body defining an internal region, an inlet passageway, and an outlet passageway, wherein the inlet and outlet passageways fluidly communicate with the internal region. A valve seat is positioned within the internal region defining a fluid passageway. A hanger is connected to the valve body. A linkage assembly is pivotally and rotatably to the hanger and a valve member is pivotally connected to the hanger via the linkage assembly, wherein the valve member is movable between an open configuration, in which fluid flow is permitted through the fluid passageway, and a closed configuration, in which the valve member engages the valve seat to at least partially restrict fluid flow through the fluid passageway.

A normally open backwater prevention valve for connecting to a sanitary drainpipe. The valve has an inflow end to connect to an upstream part of the drainpipe, and an out-flow end to connect to a downstream part of the drainpipe. There is a main body defining a flow through chamber extending between the inflow and the out-flow ends and a valve seat formed on an upstream side of the main body which faces downstream. A float assembly having opposed floats on opposite sides of the flow through chamber has a check valve assembly including at least a valve member located between the opposed floats. The valve member is sized and shaped to seal on the valve seat, and is operatively connected to the float assembly through a gear box. When the floats are down the valve member is in an open position and when the floats are up the valve member is moved to a closed position on the valve seat. Also provided is an access opening on a top of the flow through chamber, and a removable cover for sealing the access opening.

In accordance with at least one aspect of this disclosure, an adjustable vent tube joint for passing airflow therethough includes, a first segment, a flange extending radially from an outer diameter of the first segment, configured to mount to the vent tube joint to a structure, a second segment rotatably connected to the first segment, and a third segment rotatably connected to the second segment. In accordance with at least one aspect of this disclosure, an adjustable vent pipe can include, a first segment and a second segment concentric with the first segment, the second segment being slidable relative to the first segment. In accordance with at least one aspect of this disclosure, an insert for an exhaust termination can include, a frame configured to fit within an existing louvered exhaust termination, a hinge member, and a flap operatively connected to the frame via the hinge member configured to open with an exhaust flow to connect a dryer exhaust outlet to an ambient external environment through the exhaust termination.

A drainage device includes a conduit extending from a bottom end toward a top end and a valve coupled to the conduit. The valve includes a first stop having an opening and an obstruction within the conduit. The obstruction, in a first configuration, may be spaced apart from the opening, enabling fluid to flow through the first stop and through the conduit. The obstruction, in a second configuration, may block the opening to prevent fluid flow through the first stop and through the conduit. The obstruction may move from the first configuration to the second configuration in response to (1) fluid pressure acting in a direction from the bottom end toward the top end of the conduit, or (2) when a fluid having a higher density than the obstruction is disposed within the valve.

Cleanout conduit valve assemblies for a cleanout conduit may include a vertically oriented valve housing. The valve housing may include a valve inlet end configured to be disposed in fluid communication with the cleanout conduit and a valve discharge end opposite to and generally above the valve inlet end. The valve discharge end may be oriented within a valve discharge plane disposed at a discharge angle of greater than 0 degrees with respect to a horizontal plane. The valve discharge end may have an upper discharge opening side and a lower discharge opening side sloped downwardly from the upper discharge opening side. A valve body may be pivotally carried by the valve housing at the upper discharge opening side of the valve discharge end. Methods of preventing precipitation and runoff on a ground surface from entering a cleanout conduit connected to a sewer service line are also disclosed.

Pivot valves have a valve seat and a valve closure mounted for pivoting movement through a closure chamber in a passage. The pivot valves may be selectively set in a check mode and an open mode. Flapper valves have a hydrofoil extending from a flapper. Valve assemblies comprise the pivot valves and flapper valves and have an open condition, a check condition, and a shut-off condition.

A check valve has an internal gate having an adjustable retention force, such that in the event that if the differential pressure between the upstream and downstream pressure changes, the force required to allow flow through the valve may be adjusted without removal of the valve from the piping system.