A multi-function closure is provided for a liquid containment tank. The tank has an upper wall with an inspection opening therein. The closure includes a ring attached to the upper wall and extending around the inspection opening. A pan is removably fastened to the ring, and has a bottom and side wall forming a reservoir for collection of spilled liquid. A lid is pivotally connected to the pan for movement between open and closed positions, and can be locked in the closed position. Multiple ports are formed in the bottom of the pan for filling the tank with liquid, and suctioning or pumping liquid from the tank for discharge.

A multi-function closure is provided for a liquid containment tank. The tank has an upper wall with an inspection opening therein. The closure includes a ring attached to the upper wall and extending around the inspection opening. A pan is removably fastened to the ring, and has a bottom and side wall forming a reservoir for collection of spilled liquid. A lid is pivotally connected to the pan for movement between open and closed positions, and can be locked in the closed position. Multiple ports are formed in the bottom of the pan for filling the tank with liquid, and suctioning or pumping liquid from the tank for discharge.

A pressure-releasing breather hose 1 mounted on a urea water tank 2 is dividably constituted by a flexible joint portion 1a with an end capable of being fitted over a hose joint 3 on the tank 2, and a vertical portion 1b connected to the other end of the joint portion 1a and suspending downward along a side surface of the tank 2. The joint and vertical portions 1a and 1b are constituted by a rubber hose made of ethylene propylene diene terpolymer (EPDM) and a polyethylene pipe (resin pipe) made of high density polyethylene (HDPE), respectively.

A material storage unit including a bin having a bottom end, a top end, and a sidewall extending therebetween and defining an interior configured to hold particulates, where a portion of the sidewall defines an angular air flow vent having a top air inlet and a bottom air inlet. The material storage unit further includes a fill line inlet extending through one or both of the bottom end of the bin or the sidewall of the bin and in fluid communication with the interior, a venting outlet extending through one or both of the top end of the bin or the sidewall of the bin and in fluid communication with the interior, and a discharge outlet extending through the bottom end of the bin and in fluid communication with the interior.

A material storage unit including a bin having a bottom end, a top end, and a sidewall extending therebetween and defining an interior configured to hold particulates, where a portion of the sidewall defines an angular air flow vent having a top air inlet and a bottom air inlet. The material storage unit further includes a fill line inlet extending through one or both of the bottom end of the bin or the sidewall of the bin and in fluid communication with the interior, a venting outlet extending through one or both of the top end of the bin or the sidewall of the bin and in fluid communication with the interior, and a discharge outlet extending through the bottom end of the bin and in fluid communication with the interior.

An automatic aeration device includes a first floating roof, a second floating roof and a movable valve. The first floating roof has a through hole and a first enclosure. The second floating roof is disposed in the through hole and has a second enclosure. The movable valve is disposed above the first floating roof and the second floating roof and has a plate which has an outer wall and an inner wall. The outer wall is mounted in the first enclosure and has a plurality of first vent holes. The inner wall is mounted in the second enclosure and has a plurality of second vent holes. The automatic aeration device further includes a plurality of balls mounted between the first enclosure and the outer wall, and mounted between the second enclosure and the inner wall.

An automatic aeration device includes a first floating roof, a second floating roof and a movable valve. The first floating roof has a through hole and a first enclosure. The second floating roof is disposed in the through hole and has a second enclosure. The movable valve is disposed above the first floating roof and the second floating roof and has a plate which has an outer wall and an inner wall. The outer wall is mounted in the first enclosure and has a plurality of first vent holes. The inner wall is mounted in the second enclosure and has a plurality of second vent holes. The automatic aeration device further includes a plurality of balls mounted between the first enclosure and the outer wall, and mounted between the second enclosure and the inner wall.

Embodiments of the present disclosure are directed toward a pressure vacuum relief valve and a seal assembly of the pressure vacuum relief valve. The seal assembly includes a ribbed substrate disposed against a flanged seat of the pressure vacuum relief valve. The ribbed substrate includes ribs extending from a base of the ribbed substrate. The seal assembly also includes a pallet coupled to and disposed below the ribbed substrate. The pallet includes a top ring, a bottom ring, and a flexible diaphragm captured between the top ring and the bottom ring. The flexible diaphragm of the pallet is configured to seal against the ribbed substrate in a sealed position. The pallet and ribbed substrate are configured to move together away from the flanged seat when a pressure on a sealed side of the pressure vacuum relief valve exceeds a maximum pressure threshold. The pallet is also configured to pivot open at an angle relative to the sealed position of the pallet when the pressure on the sealed side of the pressure vacuum relief valve falls below a minimum pressure threshold.

Embodiments of the present disclosure are directed toward a pressure vacuum relief valve and a seal assembly of the pressure vacuum relief valve. The seal assembly includes a ribbed substrate disposed against a flanged seat of the pressure vacuum relief valve. The ribbed substrate includes ribs extending from a base of the ribbed substrate. The seal assembly also includes a pallet coupled to and disposed below the ribbed substrate. The pallet includes a top ring, a bottom ring, and a flexible diaphragm captured between the top ring and the bottom ring. The flexible diaphragm of the pallet is configured to seal against the ribbed substrate in a sealed position. The pallet and ribbed substrate are configured to move together away from the flanged seat when a pressure on a sealed side of the pressure vacuum relief valve exceeds a maximum pressure threshold. The pallet is also configured to pivot open at an angle relative to the sealed position of the pallet when the pressure on the sealed side of the pressure vacuum relief valve falls below a minimum pressure threshold.

Embodiments of the present invention relate to apparatuses, systems, and methods for constructing, installing, and using an inflatable hatch sealing device in environmentally sealing a manhole. In particular, the inflatable hatch sealing device has a sealing assembly with a directed inflatable air bladder, and the sealing assembly is rotatable relative to a contact disc.