In a valve device for a fuel tank, a fuel liquid level of filling-up fuel feed and an allowable fuel amount of additional fuel feed can be easily and appropriately changed by replacing only a part of components forming the valve device. A first valve chamber has a structure of positioning an open end below a support portion of a first float having a passage portion for a fluid. A second valve chamber includes a support portion of a second float having a passage portion for the fluid. The first valve chamber and the second valve chamber are formed by fitting a lower-portion including the support portion and the open end of the first float and the support portion of the second float relative to an upper-portion including a first valve opening and a second valve opening.

In a valve device for a fuel tank, a condition of blowing out a fuel to an outside of a fuel tank can be prevented as little as possible. The valve device includes a valve opening for communicating inside and outside of the fuel tank; a valve chamber formed below the valve opening; and a float disposed inside the valve chamber to be movable up and down, and the valve chamber has a structure of positioning an open end below a support portion of the float having a passage portion for a fluid. An orifice is formed in the support portion, and by a notch portion formed in the valve chamber, an entrance of an orifice-ventilation path communicating with the orifice is formed at a side lower than the support portion and at a side upper than the open end.

A method and apparatus are provided for controlling a fuel delivery system to limit acidic corrosion. An exemplary control system includes a controller, at least one monitor, an output, and a remediation system. The monitor of the control system may collect and analyze data indicative of a corrosive environment in the fuel delivery system. The output of the control system may automatically warn an operator of the fueling station of the corrosive environment so that the operator can take preventative or corrective action. The remediation system of the control system may take at least one corrective action to remediate the corrosive environment in the fuel delivery system.

An overfill-prevention valve system includes a testing mechanism, operable by a user from the inlet end of the drop tube, which can be used to verify proper valve function without actually filling the storage tank. The testing mechanism allows the user to actuate the valve manually using a test probe, such as by elevating a float to simulate a full storage tank. The testing mechanism may be located upstream of the valve to facilitate the testing operation without interfering with the valve body. The mechanism may further provide non-contact functionality, such as with magnetic actuators on either side of the drop tube wall, to eliminate a potential test mechanism leak points. The test probe used to actuate the test mechanism may be shaped to define a desired rotational position at the test location within the drop tube, ensuring proper rotational alignment of the magnetic actuators.

Systems and methods for hot refueling from a fuel source to one or more fuel tanks associated with equipment in the hot zone of a well site. Automatic valves are located at the fuel tanks, obviating the need for electronic communication in or out of the hot zone. A flexible conduit or hose is connected between one or more outlet ports of the fuel source to corresponding one or more automatic valves at the fuel tanks. The valve, such as a float-type valve, uses fuel level to open the valve whenever the fuel tank is below a full fuel level threshold. Fuel levels at or above the full fuel level threshold automatically close the valve.

A gravity-fed fuel delivery system is provided. A central storage tank holds fuel to re-supply a number of pump trucks or other mechanized equipment, such as on a hydraulic fracturing location, and can be selectively raised or lowered. Hoses or other conduits extend from the central storage tank to individual fuel tanks of the equipment to be refueled. Adapters allow connection of the distal end of each hose or conduit to an inlet opening of a fuel tank. A float valve assembly senses when fuel inside an individual fuel tank is below a predetermined level, thereby mechanically opening a valve assembly to permit fluid to flow from the central storage tank, through a conduit, through the float valve assembly and into the fuel tank.

A gravity-fed fuel delivery system is provided.

A central storage tank holds fuel to re-supply a number of pump trucks or other mechanized equipment, such as on a hydraulic fracturing location, and can be selectively raised or lowered. Hoses or other conduits extend from the central storage tank to individual fuel tanks of the equipment to be refueled. Adapters allow connection of the distal end of each hose or conduit to an inlet opening of a fuel tank. A float valve assembly senses when fuel inside an individual fuel tank is below a predetermined level, thereby mechanically opening a valve assembly to permit fluid to flow from the central storage tank, through a conduit, through the float valve assembly and into the fuel tank.

An overfill-prevention valve system includes a testing mechanism, operable by a user from the inlet end of the drop tube, which can be used to verify proper valve function without actually filling the storage tank. The testing mechanism allows the user to actuate the valve manually using a test probe, such as by elevating a float to simulate a full storage tank. The testing mechanism may be located upstream of the valve to facilitate the testing operation without interfering with the valve body. The mechanism may further provide non-contact functionality, such as with magnetic actuators on either side of the drop tube wall, to eliminate a potential test mechanism leak points. The test probe used to actuate the test mechanism may be shaped to define a desired rotational position at the test location within the drop tube, ensuring proper rotational alignment of the magnetic actuators.

A system and related method of filling tanks is provided so that tanks do not attain an overfill condition and/or so the tanks are filled to a maximum specified capacity. The system includes an adjustable float switch having a float configured to float in liquid that is filled into a trailer tanker, a mix tank, a frac tank, a storage tank and a variety of other tanks. The float can be set so that when the liquid attains a maximum level and associated volume, the float switch opens so that pressurized air can be communicated from it to a pneumatically actuated tanker valve disposed in a supply line. This shuts off the flow of liquid through the supply line and into the tank. The system can be operable in a various modes, such as a filling mode, a filled mode, a manual emergency shutoff mode and/or a manual reset mode.

A gravity-fed fuel delivery system is provided. A central storage tank holds fuel to re-supply a number of pump trucks or other mechanized equipment, such as on a hydraulic fracturing location, and can be selectively raised or lowered. Hoses or other conduits extend from the central storage tank to individual fuel tanks of the equipment to be refueled. Adapters allow connection of the distal end of each hose or conduit to an inlet opening of a fuel tank. A float valve assembly senses when fuel inside an individual fuel tank is below a predetermined level, thereby mechanically opening a valve assembly to permit fluid to flow from the central storage tank, through a conduit, through the float valve assembly and into the fuel tank.