A negative pressure pipeline opening-and-closing device includes a blocking member and a buoyant member. The buoyant member comprises two floats and a connection rod connected to the two floats. The liquid reservoir is provided with a guide therein, and the guide confines the two floats, the blocking member and the liquid outlet port in the same vertical line. A limiting member is arranged between the two floats and is fixed to an inner wall of the liquid reservoir. A maximum distance between the limiting member and a top wall of a lower float of the two floats is smaller than a maximum distance between a top wall of an upper float of the two floats and a top wall of the liquid reservoir. The negative pressure pipeline opening-and-closing device can replace an existing electrically controlled valve. Therefore, the cost is reduced, the maintenance is convenient and service life is prolonged.

A negative pressure pipeline opening-and-closing device includes a blocking member and a buoyant member. The buoyant member comprises two floats and a connection rod connected to the two floats. The liquid reservoir is provided with a guide therein, and the guide confines the two floats, the blocking member and the liquid outlet port in the same vertical line. A limiting member is arranged between the two floats and is fixed to an inner wall of the liquid reservoir. A maximum distance between the limiting member and a top wall of a lower float of the two floats is smaller than a maximum distance between a top wall of an upper float of the two floats and a top wall of the liquid reservoir. The negative pressure pipeline opening-and-closing device can replace an existing electrically controlled valve. Therefore, the cost is reduced, the maintenance is convenient and service life is prolonged.

The invention provides a shut-off valve (10) for a hydrocarbon liquid or fuel intake. The valve includes a first float body (14) configured to float at the surface of hydrocarbon fuel (15), a fuel intake (16) located on the first float (14) and positioned such that the intake (16) is below the surface of the fuel (15), in use, and a second float body (18) configured to float on water (20) and sink in hydrocarbon fuel (15) such that the body (18) floats at an interface of hydrocarbon fuel (15) and water (20) phases, in use. A closing means (24) is located on the second float (18) for closing or restricting the fuel intake (16) when the first float (14) and second float (18) are in contact or in close proximity and further includes a guide arrangement (26) for guiding the first and second float (14, 18) towards each other as the surface of the hydrocarbon fuel (15) approaches the fuel water interface.

The invention provides a shut-off valve (10) for a hydrocarbon liquid or fuel intake. The valve includes a first float body (14) configured to float at the surface of hydrocarbon fuel (15), a fuel intake (16) located on the first float (14) and positioned such that the intake (16) is below the surface of the fuel (15), in use, and a second float body (18) configured to float on water (20) and sink in hydrocarbon fuel (15) such that the body (18) floats at an interface of hydrocarbon fuel (15) and water (20) phases, in use. A closing means (24) is located on the second float (18) for closing or restricting the fuel intake (16) when the first float (14) and second float (18) are in contact or in close proximity and further includes a guide arrangement (26) for guiding the first and second float (14, 18) towards each other as the surface of the hydrocarbon fuel (15) approaches the fuel water interface.

A fill valve for receiving a fluid flow includes a lower pipe and a flow restrictor cartridge. The flow restrictor cartridge is received in the lower pipe. The flow restrictor cartridge receives the fluid flow at a first fluid flow rate and provides the fluid flow as a second fluid flow rate lower than the first fluid flow rate. The flow restrictor cartridge includes a receiver and a compact flow restrictor. The compact flow restrictor is received by the receiver. The compact flow restrictor is configured to facilitate the reduction from the first fluid flow rate to the second fluid flow rate.

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 negative pressure pipeline opening-and-closing device includes a blocking member and a buoyant member. The buoyant member comprises two floats and a connection rod connected to the two floats. The liquid reservoir is provided with a guide therein, and the guide confines the two floats, the blocking member and the liquid outlet port in the same vertical line. A limiting member is arranged between the two floats and is fixed to an inner wall of the liquid reservoir. A maximum distance between the limiting member and a top wall of a lower float of the two floats is smaller than a maximum distance between a top wall of an upper float of the two floats and a top wall of the liquid reservoir. The negative pressure pipeline opening-and-closing device can replace an existing electrically controlled valve. Therefore, the cost is reduced, the maintenance is convenient and service life is prolonged.

A negative pressure pipeline opening-and-closing device includes a blocking member and a buoyant member. The buoyant member comprises two floats and a connection rod connected to the two floats. The liquid reservoir is provided with a guide therein, and the guide confines the two floats, the blocking member and the liquid outlet port in the same vertical line. A limiting member is arranged between the two floats and is fixed to an inner wall of the liquid reservoir. A maximum distance between the limiting member and a top wall of a lower float of the two floats is smaller than a maximum distance between a top wall of an upper float of the two floats and a top wall of the liquid reservoir. The negative pressure pipeline opening-and-closing device can replace an existing electrically controlled valve. Therefore, the cost is reduced, the maintenance is convenient and service life is prolonged.

A fuel shutoff valve includes a valve, a float, and an auxiliary member. The valve is configured to open or close an air passage of a fuel tank. The float floats on fuel and moves in a valve closing direction to close the valve, or in a valve opening direction opposite to the valve closing direction to open the valve. The auxiliary member has a predetermined weight, and abuts on the float to apply a weight on the float in the valve opening direction, or separating from the float not to apply the weight on the float in the valve closing direction.

A fuel shutoff valve includes a valve, a float, and an auxiliary member. The valve is configured to open or close an air passage of a fuel tank. The float floats on fuel and moves in a valve closing direction to close the valve, or in a valve opening direction opposite to the valve closing direction to open the valve. The auxiliary member has a predetermined weight, and abuts on the float to apply a weight on the float in the valve opening direction, or separating from the float not to apply the weight on the float in the valve closing direction.