The present invention relates to the field of floor treatment machines which involve wet treatment of a floor or carpet in which dirty liquid is collected by suction. In one aspect there is provided a float valve assembly for a collection tank in a suction liquid collection device, the assembly comprising: a float constrained in an enclosure which is configured to permit the float to rise in response to a rising liquid level, a closure feature disposed above the float and connected thereto so that as the float rises the closure feature rises from an initial position, wherein a suction port is disposed in the tank vertically spaced apart from the initial position of the closure feature, the suction port being in fluid communication with a suction drive which in use draws air-entrained liquid into the collection tank, the arrangement being such that as liquid fills the tank the liquid acts upon the float to cause the closure feature to travel towards the suction port, and when the closure feature rises sufficiently, the closure feature obturates the suction port, thereby closing the suction port and preventing further air-entrained liquid from entering. The closure feature may be connected to the float by a plunger which is disposed above the float so that the float shunts the plunger to travel in an upwards direction as the float rises.

The present invention relates to the field of floor treatment machines which involve wet treatment of a floor or carpet in which dirty liquid is collected by suction. In one aspect there is provided a float valve assembly for a collection tank in a suction liquid collection device, the assembly comprising: a float constrained in an enclosure which is configured to permit the float to rise in response to a rising liquid level, a closure feature disposed above the float and connected thereto so that as the float rises the closure feature rises from an initial position, wherein a suction port is disposed in the tank vertically spaced apart from the initial position of the closure feature, the suction port being in fluid communication with a suction drive which in use draws air-entrained liquid into the collection tank, the arrangement being such that as liquid fills the tank the liquid acts upon the float to cause the closure feature to travel towards the suction port, and when the closure feature rises sufficiently, the closure feature obturates the suction port, thereby closing the suction port and preventing further air-entrained liquid from entering. The closure feature may be connected to the float by a plunger which is disposed above the float so that the float shunts the plunger to travel in an upwards direction as the float rises.

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 leak-proof water valve includes a water inner tube, an outer tube group and a buoyant housing. When the sealing plug of the toilet tank is leaking, leak-proof structure of a buoyant housing for automatically detection is provided to stop the water inlet valve supplying water, so that a user could be aware of the leaking situation to thereby avoid the waste of water resources.

A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. A specialized valve at the fleet unit fuel tank prevents vapor escape and admits fuel at low, gravity-feed pressures. The valve includes a valve body with an upper end and a lower end, the upper end adapted to engage a cap which affixes the valve body to the fuel tank fill mouth. Below the cap, a fuel cut-off plunger and seat selectively interrupt fuel flow through the mouth by responding to a buoyant float extending coaxially beneath the valve body and into the fuel tank. Linkage coupled to the plunger extends through the valve body to the float, and roller bearings within the valve body engage a shaft extending from the float coaxially into the lower end of the valve body.

The present disclosure provides a return gas prevention device for a drainage pipe, belonging to the technical field of drainage pipes. The device realizes two functions of water seal and a check valve simultaneously, as well as prevents gas channeling in a drainage process.

A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. A specialized valve at the fleet unit fuel tank prevents vapor escape and admits fuel at low, gravity-feed pressures. The valve includes a valve body with an upper end and a lower end, the upper end adapted to engage a cap which affixes the valve body to the fuel tank fill mouth. Below the cap, a fuel cut-off plunger and seat selectively interrupt fuel flow through the mouth by responding to a buoyant float extending coaxially beneath the valve body and into the fuel tank. Linkage coupled to the plunger extends through the valve body to the float, and roller bearings within the valve body engage a shaft extending from the float coaxially into the lower end of the valve body.

Disclosed are various embodiments of a lockable toilet fill valve and methods according to the present invention. In one embodiment, a toilet fill valve includes a float and arm assembly. The toilet fill valve is closed when the float and arm assembly is disposed in a first position. The toilet fill valve is open when the float and arm assembly is disposed in a second position. A side lever is associated with the float and arm assembly. The side lever includes an unlock position and a lock position. The side lever includes a hook that engages the float and arm assembly to restrict movement of the float and arm assembly when in the lock position and allow movement of the float and arm assembly when in the unlock position.

Disclosed are various embodiments of a lockable toilet fill valve and methods according to the present invention. In one embodiment, a toilet fill valve includes a float and arm assembly. The toilet fill valve is closed when the float and arm assembly is disposed in a first position. The toilet fill valve is open when the float and arm assembly is disposed in a second position. A side lever is associated with the float and arm assembly. The side lever includes an unlock position and a lock position. The side lever includes a hook that engages the float and arm assembly to restrict movement of the float and arm assembly when in the lock position and allow movement of the float and arm assembly when in the unlock position.