An overfill valve associated with a drop tube segment fluidly connected to a fluid reservoir is described. The overfill valve includes a valve body positioned within the drop tube segment and a non-contact valve actuator positioned exterior to the drop tube segment and operable to actuate the valve body from an open position to a closed position without requiring any physical penetration through the wall of the drop tube segment. The non-contact valve actuator has a first position in which the non-contact valve actuator does not actuate the valve body from the open position to the closed position in a second position, achieved when the liquid reservoir reaches a predetermined level approaching the capacity of the liquid reservoir, the non-contact valve actuator actuating the valve body from the open position to the closed position when the non-contact valve actuator obtains the second position.

An overfill valve associated with a drop tube segment fluidly connected to a fluid reservoir is described. The overfill valve includes a valve body positioned within the drop tube segment and a non-contact valve actuator positioned exterior to the drop tube segment and operable to actuate the valve body from an open position to a closed position without requiring any physical penetration through the wall of the drop tube segment. The non-contact valve actuator has a first position in which the non-contact valve actuator does not actuate the valve body from the open position to the closed position in a second position, achieved when the liquid reservoir reaches a predetermined level approaching the capacity of the liquid reservoir, the non-contact valve actuator actuating the valve body from the open position to the closed position when the non-contact valve actuator obtains the second position.

An automatic leak-proof water inlet device for a water tank, including an inner cylinder, an outer cylinder set, a floating casing and an assist floating set; wherein the outer cylinder set is consisted of an outer cylinder, a cover, a first connecting rod, a second connecting rod, an adjusting rod, an interlocking rod, an insert, a water stopper, a first spring and a second spring; the assist floating set includes a supporting seat and a float; by the above structure, it could stop water leakage of water tank automatically and close water inlet in time, to thereby avoid the waste of water resources.

A liquid level control module comprising an elongated tubular housing immersible through a surface of a liquid and into a bulk volume of the liquid, and first, second, and third electrical switches, and first and second floats movable along the tubular housing. The first electrical switch is disposed within a lower portion of the tubular housing, the second electrical switch is disposed within an intermediate portion of the tubular housing, and the third electrical switch is disposed within an upper portion of the tubular housing. Each of the switches has an open state and a closed state. Motion of the first float relative to the first switch changes its state. Motion of the second float relative to the second switch changes its state, and motion of the second float relative to the third switch changes its state. Thus a two-float module may provide three level control signals.

A valve assembly may be used with a container for holding a fluid including a liquid and a gas. The valve assembly may have a chamber, inlet, and outlet. The chamber may provide an exhaust route for fluid from the container to the outlet. A check valve including a sealing member with a through hole may move between an open and closed position. In the open position, check valve may provide a main flow route for fluid leaving the internal chamber. The through hole may provide a limited return flow route for gas returning to the internal chamber when the check valve is closed. The valve assembly may include a breather check valve movable between a closed and open position in which it provides fluid communication between the exhaust route and externally of the housing. A filter may communicate with the breather check valve.

An automatic leak-proof water inlet device for a water tank, including an inner cylinder, an outer cylinder set, a floating casing and an assist floating set; wherein the outer cylinder set is consisted of an outer cylinder, a cover, a first connecting rod, a second connecting rod, an adjusting rod, an interlocking rod, an insert, a water stopper, a first spring and a second spring; the assist floating set includes a supporting seat and a float; by the above structure, it could stop water leakage of water tank automatically and close water inlet in time, to thereby avoid the waste of water resources.