A storm water management system includes a flow control device that includes a float in a storage chamber responsive to changes in water level and a valve disposed between the storage chamber and a discharge. The valve includes a relatively movable valving member connected to the float and a fixed valving member. Each valving member has a through opening that receives storm water flowing between the storage chamber and the discharge. The through-openings overlap one another whereby relative displacement of the valving members caused by float movement defines a variable-sized orifice between the storage chamber and the discharge that regulates the discharge rate of storm water from the system. The shapes of the overlapping openings enable the valve to closely follow the ideal output hydrograph and maximize the discharge rate as a function of storm intensity, thereby minimizing the required volume of the storage chamber.

A valve body, including a first cavity, a second cavity communicated with the first cavity through a second water inlet of the second cavity, a valve core and an elastic reset member; the valve core, arranged in the first cavity and coaxial with the second water inlet, includes a piston and a first ejector rod being coaxial with the piston; the piston is configured to open or close the second water inlet; the elastic reset member is configured to press the valve core to move in the axial direction to close the second water inlet. A self-locking level control valve is adopted. The water purifier achieves no reactive power loss, low emission and safe water quality, avoids frequent startup of the water purification system, and solves the technical problem of the “first glass of water” brought by the ultra-low pressure reverse osmosis pumpless water purification system.

A liquid level control system, which may be used with a clarifier in a sewage treatment plant, manages liquid level of an upstream basin by controlling liquid flow in or out of a system that may use a midstream device to equally distribute flow in or out of the basin. This headloss inducing device creates a non-linear relationship between upstream liquid level to be controlled and the lesser downstream liquid level behind the gate or valve. Without the use of electrical controls, the systems of the invention include a gate or valve with counterforces that manage the outflow stream of liquid while accounting for the non-linear head loss created by the midstream device, thus reaching a desired liquid level range for all system flowrates.

A valve includes a housing, a first ball, a second ball, and a deflector plate. The housing defines an inner chamber and has an inlet and an outlet providing fluid communication into the inner chamber. A longitudinal axis extends between the inlet and outlet. The first ball is disposed in the inner chamber between the inlet and outlet and rests on a seat extending into the inner chamber. The second ball is disposed in the inner chamber between the first ball and outlet and rests on the first ball. The deflector plate is disposed in the inner chamber and positioned between the inlet and first ball. The first ball, second ball, and deflector plate are aligned so that their centers lie on the longitudinal axis. The deflector plate is configured to deflect gas entering through the inlet to prevent the gas from driving the first and second balls upward.

A valve includes a housing, a first ball, a second ball, and a deflector plate. The housing defines an inner chamber and has an inlet and an outlet providing fluid communication into the inner chamber. A longitudinal axis extends between the inlet and outlet. The first ball is disposed in the inner chamber between the inlet and outlet and rests on a seat extending into the inner chamber. The second ball is disposed in the inner chamber between the first ball and outlet and rests on the first ball. The deflector plate is disposed in the inner chamber and positioned between the inlet and first ball. The first ball, second ball, and deflector plate are aligned so that their centers lie on the longitudinal axis. The deflector plate is configured to deflect gas entering through the inlet to prevent the gas from driving the first and second balls upward.

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.

A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. Specialized valves at the fleet unit fuel tanks prevent vapor escape and admit fuel at low, gravity fed pressures. The cylindrical silo tank includes an upper, gravity feed dispensing chamber and a lower reservoir chamber. A fuel pump doubles as means for moving fuel from the reservoir chamber to the dispensing chamber and for refilling the reservoir from fuel delivery trucks. Onboard telemetry transmits fuel consumption and flow rates wirelessly to a control center where operators monitor safety parameters in real time. Stored data may be analyzed to calculate fleet unit maintenance and service intervals. A tractor trailer hauls the silo tank horizontally on roads and highways and includes a gantry and hydraulic lifts to erect the silo tank into vertical operating position supported by a built-in platform.

A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. Specialized valves at the fleet unit fuel tanks prevent vapor escape and admit fuel at low, gravity fed pressures. The cylindrical silo tank includes an upper, gravity feed dispensing chamber and a lower reservoir chamber. A fuel pump doubles as means for moving fuel from the reservoir chamber to the dispensing chamber and for refilling the reservoir from fuel delivery trucks. Onboard telemetry transmits fuel consumption and flow rates wirelessly to a control center where operators monitor safety parameters in real time. Stored data may be analyzed to calculate fleet unit maintenance and service intervals. A tractor trailer hauls the silo tank horizontally on roads and highways and includes a gantry and hydraulic lifts to erect the silo tank into vertical operating position supported by a built-in platform.

A water level control system and device is provided which maintains a desired running level of water in a surge tank connected to a pool or other body of water by facilitating automatic drainage of precipitation water from the body of water. The water level control system includes a water level control device configured to open and close a drain in the surge tank. The water level control device can adopt an open position when water in the surge tank is at a first level slightly above the running level, and a closed position in the presence of surge water or water displaced by bathers causing a rapid water rise in the surge tank above first level.

A water level control system and device is provided which maintains a desired running level of water in a surge tank connected to a pool or other body of water by facilitating automatic drainage of precipitation water from the body of water. The water level control system includes a water level control device configured to open and close a drain in the surge tank. The water level control device can adopt an open position when water in the surge tank is at a first level slightly above the running level, and a closed position in the presence of surge water or water displaced by bathers causing a rapid water rise in the surge tank above first level.