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 inlet valve having a shortened lifting lever mechanism includes a main body having defined therein a compression hole and a waterway passage; a sealing pad; a float; and a shortened lifting lever mechanism that is rotatably connected to the main body, that comprises at least two lever stages each having a fulcrum, respectively, and that include a first stage lever, and a last stage lever that are connected in a driving way. The float is coupled to the first stage lever so that a dynamic body is formed to drive the shortened lifting lever mechanism to move. The sealing pad is assembled to the last stage lever so that the sealing pad opens or closes the compression hole with the movement of the shortened lifting lever mechanism when the float moves up and down. A method of shortening a lifting lever mechanism of an inlet valve is also disclosed.

This disclosure provides apparatus and methods for watering livestock using a livestock waterer, a water source, and a waterer valve system for replenishing water in a water reservoir of the livestock waterer. A valve housing can be affixed to the water reservoir and coupled to a plunger. A cam can be pivotably coupled to the valve housing and one end of a float arm. A float component can be coupled to the opposite end of the float arm. Water from the water supply can enter the valve housing and exit an orifice in the valve housing along first and second side spouts. The float component can have a generally flat bottom and move vertically along with the water level within the water reservoir. As the float component moves vertically, the float arm pivots the cam. The cam can move the plunger in the valve housing to stop water flow.

An improved mechanical dump valve for a liquid level control system. The dump valve comprises a splined shaft that communicates with the valve actuator by a toothed member, such as a splined bore in a dump valve hub. The dump valve also may include pressure ports. Still further, the present invention includes a liquid level control system comprising a trunnion assembly and a mechanical dump valve in which the trim motion of the float valve is transmitted by means of splined shafts in both the trunnion assembly and the dump valve assembly. The inventive system may comprise float weights for weighting the float accurately without having to drill the float and load it with sand or other weighting material. Also included is a kit for retrofitting existing liquid level control systems that use D-shaped connections with splined components.

A valve arrangement according to the present disclosure includes a valve module and a drain valve. The valve module includes first and second functional spaces, and an attachment interface defining a passage into one of the first or second functional spaces. The drain valve includes a fluid inlet and a fluid outlet formed through a common connector part that is connectable to the attachment interface to connect the fluid inlet of the drain valve to the second functional space and the at least one fluid outlet to the first functional space.

A shelf is arranged to pivot about a pivot zone. The shelf has a center of gravity offset from the pivot zone. The shelf has a first angular range about the pivot zone configured to situate a linkage in a valve activation position. The shelf has a second angular range about the pivot zone mechanically configured to situate the linkage in a valve de-activation position. An interaction portion is mechanically configured to urge the shelf from the first angular range to the second angular range by a float moving in a first direction.

In a ball tap 1, a valving element 3 includes a valve part 10 provided with a contact projection part 9 that can come into close contact with a valve seat 7 when the valving element 3 is closed, and a flange part 11 having a circular ring shape in plan view which continues downward from the rim of the valve part 10 and is slidable like a piston in the secondary side flow passage 5, and the left and right half circumferences of the upper surface of the flange part 11 have bilaterally symmetrical shapes curved downward in arch shapes, and the left and right lower limit portions of the upper surface of the flange part are set so as to be positioned at the same heights as those of the lower end edges of drainage ports 8.