Abstract: Agricultural device for soil processing with two sets of working rollers comprising a supporting frame, which comprises a central part, a left wing and a right wing, wherein the left and right wing are rotatably attached to the central part, at least two rows of working units attached to the supporting frame, wherein the working units are arranged in regular distances in every row, a left set of rollers attached to the left wing and a right set of rollers attached to the right wing, wherein the sets of rollers are divided into front rollers and rear rollers and provided with attachments and discs, wherein the discs on the sets are located between these attachments. The number of discs of rear rollers differs exactly by one disc from the number of discs of front rollers, wherein the distances between individual discs are the same along the whole width of the agricultural device, and wherein the discs of front rollers are located in the same plane as the working units.

Abstract: An agricultural implement includes a tow bar assembly for towing the implement with a towing vehicle. The tow bar assembly includes a tow bar mounted to a part of the implement by a first pivot bearing so as to be pivotable about a first vertical axis. The tow bar assembly includes an arm parallel with and spaced vertically below the tow bar. The arm is attached to the part of the implement by a second pivot bearing so as to be pivotable about a second vertical axis that is coaxially located with the first vertical axis.

Abstract: The present invention relates to the technical field of the growing of crop plants, especially the creation of forecasts of the expected yield.

Abstract: In one aspect, an agricultural row unit is provided an includes a frame, an opener disc rotatably coupled to the frame and configured to open a seed trench, and an applicator assembly coupled to the frame and configured to apply a liquid. The applicator assembly including a housing and a valve coupled to the housing and configured to be in fluid communication with a fluid source. The valve is electronically powered to move to an open condition, in which fluid is configured to pass through and emit from the valve, and electronically powered to move to a closed condition, in which fluid is inhibited from passing through and emitting from the valve. The agricultural row unit also includes a closing wheel coupled to the frame and configured to close the seed trench.

Abstract: A soil apparatus (e.g., seed firmer) having a locking system is described herein. In one embodiment, the soil apparatus includes a lower base portion for engaging in soil of an agricultural field, an upper base portion, and a neck portion having protrusions to insert into the lower base portion of a base and then lock when a region of the upper base portion is inserted into the lower base portion and this region of the upper base portion presses the protrusions to lock the neck portion to the upper base portion.

Abstract: A soil apparatus (e.g., seed firmer) having a locking system is described herein. In one embodiment, the soil apparatus includes a lower base portion for engaging in soil of an agricultural field, an upper base portion, and a neck portion having protrusions to insert into the lower base portion of a base and then lock when a region of the upper base portion is inserted into the lower base portion and this region of the upper base portion presses the protrusions to lock the neck portion to the upper base portion.

Abstract: An air cart for use in an agricultural air seeding system is provided. The air cart includes a first storage compartment for holding a first granular product type. The air cart also includes a second storage compartment for holding a second granular product type different from the first granular product type. The air cart further includes a common conduit configured to receive the first granular product type from the first storage compartment and the second granular product type from the second storage compartment to enable simultaneous flow of the first granular product type and the second granular product type. The air cart even further includes a multi-product particle flow rate sensing system configured to monitor respective flow rates for both the first granular product type and the second granular product type during simultaneous flow of the first granular product type and the second granular product type through the common conduit.

Abstract: Systems, methods, and apparatus are disclosed for selecting an agricultural input. First and second seed meters selectively meter seed from first and second sources, respectively, into a common planting trench. In some embodiments, the seed meters are selectively operated by electric motors controlled with reference to a seed type prescription.

Abstract: A monitoring system for and a monitoring method for a planter includes a computer having an unit speed fusion module, a seeding flow rate monitoring module, and a decision module for theoretical rotation speed of a drive motor, a rotation speed deviation inference module, a controlling parameter tuning module, an adjusting module for rotation speed of a seeding shaft, a controlling module for rotation speed of seeding shaft; and a positioning signal receiver fixed on a top of a cab for receiving a geographic position signal. The system monitors operating state parameters of the planter and accurately controls seed amount.

Abstract: A distribution device, in particular a sowing machine, for distributing a good, with at least one storage container and at least one discharge apparatus. The storage container is connected to the discharge apparatus by at least one outlet channel such that the good arranged in the storage container can be transferred to the discharge apparatus such that the good can be distributed by the discharge apparatus. The distribution device has a first and a second part. The first and the second parts can be moved in relation to each other such that the outlet channel can be at least partially exposed.

Abstract: A method and apparatus for cultivating vegetation at an arid location includes rooting immature vegetation in a mat combined with a super absorbent polymer (“SAP”) and, in embodiments, fertilizer, sand, and/or soil; placing the mat at the arid location; and covering the mat with a perforated, transparent or semi-transparent cover. Most or all of the apparatus can be biodegradable or removable, and the sand or soil can be similar to indigenous sand or soil. A water barrier can be placed below the mat. The cover can be placed on or suspended above the mat. SAP, seeds, and/or additional water barriers can be placed between mats in a stack. The opacity of the cover can be increased to emulate shade from natural vegetation. A water distribution system can be included for continued support of the vegetation, and can include a water reservoir and/or at least one solar still.

Abstract: A particulate material sensing and agitation control system of an agricultural system having a drive system configured to operate an agitating system, and a controller having a memory and a processor. The controller is configured to receive at least one sensor signal indicative of a profile of a particulate material within the agricultural system, and output a control signal to instruct the drive system to operate the agitating system in a selected operating mode of a plurality of operating modes based on the profile of the particulate material. The agitating system is configured to interact with the particulate material in each operating mode of the plurality of operating modes, and the plurality of operating modes includes an agitation mode and a leveling mode.

Abstract: A distribution and leveling system for a particulate material storage compartment includes an auger configured to be disposed within the particulate material storage compartment. The auger is configured to move particulate material across the particulate material storage compartment via rotation of the auger about a first rotational axis. The distribution and leveling system also includes an agitator positioned below the auger. The agitator is configured to agitate the particulate material via rotation of the agitator about a second rotational axis. In addition, the first rotational axis is substantially parallel to the second rotational axis, rotation of the auger and rotation of the agitator are independently controllable, and the first rotational axis and the second rotational axis are substantially aligned with one another along a longitudinal axis of the particulate material storage compartment.

Abstract: A particulate material sensing and agitation control system of an agricultural system includes an agitator configured to induce movement of particulate material through the agricultural system, a drive system coupled to the agitator, and a sensing system configured to determine a current flowing through the drive system. The drive system is configured to move the agitator, and the drive system is powered via an electrical circuit. The sensing system includes a first input coupled to a first point on the electrical circuit, the sensing system includes a second input coupled to a second point on the electrical circuit, the sensing system is configured to determine a voltage differential between the first point and the second point, and the sensing system is configured to determine current flowing through the electrical circuit based on the voltage differential.

Abstract: A modular meter roller for an agricultural metering system. The modular meter roller includes a first roller segment that couples to and rotates with a shaft to meter flowable particulate material. The first roller segment includes a body that defines an aperture. The aperture receives the shaft and the aperture defines a plurality of vertices. A first plurality of fins extending radially outward from the body. The first plurality of fins defines a first plurality of grooves in the first roller segment that receives flowable particulate material. A vertex of the plurality of vertices of the aperture is offset from a longitudinal axis of a fin of the first plurality of fins.

Abstract: A particulate material agitation and leveling control system includes a controller having a memory and a processor. The processor is configured to receive a sensor signal indicative of a measured load on a drive system coupled to an agitation and leveling system, select an operating mode of the agitation and leveling system from an agitation mode and a leveling mode based on the measured load, and instruct the drive system to operate the agitation and leveling system based on the operating mode.

Abstract: A particulate material sensing and agitation control system of an agricultural system includes a drive system configured to operate an agitating system, a plurality of sensors, in which each sensor of the plurality of sensors may detect presence of particulate material at the sensor, and a controller. The controller is configured to determine a functional status of each sensor of the plurality of sensors, and, in response to determining the functional status of a respective sensor of the plurality of sensor is functioning, determine a detection status of the respective sensor. The controller is further configured to output a control signal to instruct the drive system to operate the agitating system in a selected operating mode of a plurality of operating modes based on a position within the agricultural system, the functional status, and the detection status of each sensor of the plurality of sensors.

Abstract: An agitating system includes an agitator disposed within a sub-hopper of the agitating system. The agitator is configured to promote movement of the particulate material through the sub-hopper. The agitating system also includes a deflector assembly configured to movably couple to a bracket at a position laterally offset from a center axis of the agitator. The deflector assembly includes a deflector that establishes a space between the deflector and the agitator, and the deflector is configured to block a portion of the particulate material from exerting a force onto the agitator as the particulate material flows through the sub-hopper.

Abstract: Embodiments of the present disclosure include an agitating system of an agricultural system having a drive system configured to operate an agitator and a controller comprising a memory and a processor. The controller is configured to alternatingly instruct the drive system to operate the agitator in an active operation for an active time and instruct the drive system to suspend operation of the agitator for a dwell time after the active time.

Abstract: The controller that receives at least one sensor signal indicative of a measured profile of a particulate material within a storage tank of an agricultural system. The controller also determines whether a variation between the measured profile and a target profile is greater than a threshold value. The controller outputs a first output signal to a user interface indicative of instructions to inform an operator of a profile variation, outputs a second output signal to an agitator indicative of activation of the agitator, or a combination thereof, in response to determining that the variation between the measured profile and the target profile is greater than the threshold value.

Abstract: A particulate material agitation and leveling system includes a controller having a memory and a processor. The processor is configured to receive a sensor signal indicative of a measured weight distribution of a particulate material within a storage tank of an agricultural system, determine whether a determined variation between the measured weight distribution and a target weight distribution is greater than a threshold variation, and control an agitator to decrease the determined variation in response to determining that the determined variation is greater than the threshold variation.

Abstract: An agitation control system of an agricultural system. The agitation control system includes an agitator that induces movement of particulate material through the agricultural system. An agitator motor couples to the agricultural system to move the agitator. A first motor couples to the agitation control system. The first motor includes a first sensor that detects a first temperature of the first motor and emits a first signal indicative of the first temperature. A controller couples to the agitator motor and to the first motor. The controller receives the first signal indicative of the first temperature from the first sensor and determines an ambient temperature from the first temperature. The controller controls the agitator motor in response to the ambient temperature.

Abstract: A modular meter roller for an agricultural metering system. The modular meter roller system includes a modular shaft that rotates. The modular shaft includes a first shaft section. The first shaft section includes a first shaft portion. The first shaft portion supports a first roller segment. A second shaft portion couples to the first shaft portion. A second shaft section supports a second roller segment. The second shaft section defines an aperture. The second shaft section couples to the second shaft portion by sliding over the second shaft portion. An end cap couples to the second shaft section. The end cap couples a first end plate to the modular shaft.

Abstract: A modular meter roller for an agricultural metering system. The modular meter roller includes a shaft that rotates. A first roller segment that defines a first aperture that receives the shaft. The first roller segment receives and meters flowable particulate material in a groove via rotation of the shaft. A first end plate couples to the shaft. The first end plate blocks removal of the first roller segment in a first axial direction. A second end plate removably couples to the shaft. The second end plate enables an exchange of the first roller segment with a second roller segment and blocks removal of the first roller segment in a second axial direction during operation of the modular meter roller.

Abstract: A conveying device is provided for an upwardly oriented, in particular vertical, conveyance of turnips or other root crops in harvesting machines. A conveyor belt with at least two lateral conveyor belt portions is moved in a conveying direction during operation. Between the conveyor belt portions is defined a particularly planar conveyor belt surface, and at least one carrier unit which projects from the conveyor belt surface and is supported by the conveyor belt. The carrier unit delimits a receiving space extending on both sides of the conveyor belt surface. The part of the receiving space which is arranged on the side of the conveyor belt surface which is opposite the carrier unit is formed by at least one detachably fastened pocket module and harvesting machines for turnips or other root crops having a conveying device.

Abstract: Embodiments of a harvesting machine configured to uproot hemp plants and process various cut portions of the plants. The harvesting machine includes a harvesting head removably coupled to a main body of the harvesting machine. The harvesting head includes a roller positioned adjacent a lower front end of the harvesting head, the roller having tines extending therefrom and the roller configured to rotate so that the tines loosen soil and lift roots of the plants from the soil. The harvesting machine includes at least one belt positioned adjacently rearward of the roller and is configured to move the uprooted plants from the tines and to move the uprooted plants rearward from the harvesting head. Further, the harvesting head includes a cutting system positioned adjacent the at least one belt and is configured to make at least two cuts along a length of the plant to form the cut portions.

Abstract: A garden tool includes a power assembly and a handle assembly. The handle assembly has a start key electrically connected with the power assembly and a cover capable of at least partially shielding the start key. The cover is configured to be moved from a closed position to an opened position under driving of external force so as to operate the start key. A reset member is located between the cover and the handle assembly, the reset member being capable of driving the cover to the closed position.

Abstract: An removably attached operator control unit for controlling operation of an outdoor power equipment machine includes an operator control unit housing, a first joystick and a second joystick extending from an upper housing portion, the first and second joysticks being configured to communicate control actions to a control circuit of the operator control unit, and at least one switch configured to communicate control actions to the control circuit, wherein the control circuit is operable to receive control actions resulting from actuations of the joysticks, and switch and to communicate utilizing an interface arranged between the operator control unit and the outdoor power equipment machine, and when secured to the outdoor power equipment machine, the operator control unit is located at a height that is within about an arm's length or less of an operator standing immediately adjacent to the outdoor power equipment machine.

Abstract: A boom mower attachment that moves a cutting mechanism in a first movement, a second movement, and a third movement by only using two motions of a single control and method of use thereof is provided. The boom mower may include a frame, a boom assembly carried by the frame, a cutting mechanism operably engaged with the boom assembly, and at least one translation assembly operably engaged with the boom assembly and the cutting mechanism that moves the cutting mechanism in one or more of the first movement, the second movement, and the third movement. An implement control system including a control, at least one function switching mechanism, and an implement is also provided. Activation of the control is operative to move the implement in a first mode, a second mode, and a third mode by only using two motions of the control.

Abstract: A boom mower attachment that moves a cutting mechanism in a first movement, a second movement, and a third movement by only using two motions of a single control and method of use thereof is provided. The boom mower may include a frame, a boom assembly carried by the frame, a cutting mechanism operably engaged with the boom assembly, and at least one translation assembly operably engaged with the boom assembly and the cutting mechanism that moves the cutting mechanism in one or more of the first movement, the second movement, and the third movement. An implement control system including a control, at least one function switching mechanism, and an implement is also provided. Activation of the control is operative to move the implement in a first mode, a second mode, and a third mode by only using two motions of the control.

Abstract: A boom mower attachment that moves a cutting mechanism in a first movement, a second movement, and a third movement by only using two motions of a single control and method of use thereof is provided. The boom mower may include a frame, a boom assembly carried by the frame, a cutting mechanism operably engaged with the boom assembly, and at least one translation assembly operably engaged with the boom assembly and the cutting mechanism that moves the cutting mechanism in one or more of the first movement, the second movement, and the third movement. An implement control system including a control, at least one function switching mechanism, and an implement is also provided. Activation of the control is operative to move the implement in a first mode, a second mode, and a third mode by only using two motions of the control.

Abstract: A garden tool includes a connecting rod assembly, a working head, a power source, a first rod connected to the working head, a second rod connected to the power source, and a connection structure for mechanical and electrical connection between the first and second rods. A first terminal is arranged on the first rod and a second terminal arranged on the second rod, the first terminal being connected to a first wire, the second terminal being connected to a second wire, the first terminal and the second terminal connectable to transmit power of the power source to the working head through the first wire and the second wire. A second base is mounted in the second rod, the second base including at least two jacks independent of each other. At least two second terminals are respectively mounted in respective jacks.

Abstract: A power tool may have features for varying height or speed. The power tool may include a base chassis, one or more wheels mounted to the base chassis, and a handle frame attached to the base chassis. A slider assembly or support rail may further be included with the power tool to, for instance, aid in varying speed or height.

Abstract: Receivers are arranged to detect a corresponding observed phase shift, observed attenuation or other observed signal parameters for its respective microphone. An electronic data processor is adapted to estimate a distribution or quantity of material on the sieve based on the observed phase shift, the observed attenuation or the other observed signal parameters relative to a reference phase shift, a reference attenuation or other reference signal parameter. The operator can be alerted via a user interface if the material on the sieve is unevenly distributed or matches a preestablished distribution profile, or the sieve can be adjusted by an actuator to promote a generally uniform distribution.

Abstract: An agricultural combine having at least one loss sensor associated with a threshing and separating system, a processing device, and a user interface. The processor is configured to collect geographical position readings, operating parameter settings, and loss data readings. The operating parameter settings and loss data readings are associated with the position readings. The processor generates a display at the user interface illustrating a geographical map including at least a portion of the plurality of position readings. The geographical map graphically indicates each loss data reading associated with each position reading illustrated on the geographical map at that position reading's respective location on the geographical map. A system and method for evaluating the performance of an agricultural combine are also provided.

Abstract: A head assembly can be operationally mounted to the outlet of a conventional harvester extractor, such as a sugarcane harvester. The ancillary fan assemblies can generally direct suspended trash materials (that would otherwise be expelled from an extractor outlet) in a substantially upward and laterally outboard direction—that is, toward both lateral sides of a harvester. A duct assembly having an inlet and an outlet generally extends from each ancillary fan assembly to a position generally above a track of a harvester. Trash material expelled by a harvester extractor enters the head assembly and is directed by the ancillary fan assemblies into the duct assemblies, through the duct assemblies, and onto the upper surfaces of the tracks of the harvesters. The trash material is then conveyed by the tracks toward the front or forward portion of the harvester, where it falls off of the tracks generally in the path of the harvester.

Abstract: A feederhouse conveyor system for an agricultural harvesting machine is provided. The feederhouse conveyor system includes a power transmitting system. The power transmitting system includes first rollers, second rollers, and power transmitting bands. The power transmitting bands are configured to each transmit power between each of the first rollers and the second rollers. The feederhouse conveyor system also includes rigid cross members, configured to each attach near each end to at least one of the power transmitting bands, and flexible cross members configured to each attach near each end to at least one of the power transmitting bands. The centerlines which extend through the rigid cross members and the flexible cross members are parallel. The mat attaches to the flexible cross members by a pocket in the mat through which the flexible cross members extend.

Abstract: A gang reel mower has a hybrid engine, generator and battery pack electric power system driving a pair of electric wheel motors for propelling the mower and for driving individual reel motors for powering a plurality of reel cutting units. A master controller is programmable with a selected clip and maintains the selected clip whether the mower travels straight ahead or is turning. The output power of the generator is damped and is gradually increased during high electrical loads to prevent step responses in the engine and thereby limit engine droop. During regenerative braking of the mower, the generator can be driven as a motor to use the engine as a load. This limits the voltage produced by the traction motors during regenerative braking from damaging the electrical system or overcharging the battery pack. Moreover, maximum transport and mowing ground speeds are automatically reduced during some turns of the mower.

Abstract: A passive self-adjusting seat assembly for a lawn maintenance vehicle having a frame. The passive self-adjusting seat assembly includes a base, a guide assembly attached to the base, and a platform assembly that is selectively movable or slidable relative to the guide assembly in order to maintain an operator in an upright or substantially vertical orientation as the lawn maintenance vehicle traverses uneven or sloped ground. The seat assembly further including a locking assembly for selectively locking the sliding or movement of the platform assembly relative to the guide assembly.

Abstract: A combine harvester tailings return system includes a tailings conveyor and an ejection channel for depositing tailings upstream of a cleaning system. A proximity sensor is mounted to the ejection channel and is configured to sense the height of a layer of tailings during transit through the returns system.

Abstract: The invention relates to a reusable floral bouquet arranging fixture having a 3D substantially conic section frame, with apertures arranged thereon for the insertion of plant stems, such that the plant stems converge substantially to a common point; wherein the frame attaches to an adjustable support apparatus, including an associated spindle, and a bracket having a lower arm with a slotted portion that adjusts the location of the spindle, and an upper arm slotted portion that adjusts the location of a holding device, including a clamp that attaches to a base; and wherein said frame is removable for use at an event, as a gift, or as a household or business decoration.

Abstract: The present invention provides a plant cultivation system that is possible to continue stable irradiation of an appropriate amount of light regardless of the weather condition and the like while utilizing the sunlight. Further, the present invention provides a plant cultivation system that is possible to prevent the humans from being exposed to a visual stress when the humans approach the place where the light suited for growing the plants is irradiated. The present invention relates to a plant cultivation system, comprising: a light measure that measures an amount of photons of sunlight; a light controller that controls an amount of photons to be irradiated to a plant according to the measured amount of photons; and a light irradiator that irradiates light to the plant in the controlled amount of photons.

Abstract: A replaceable tray for inserting into an exit path of a bee hive includes: (a) a tray body having a base and at least one side wall extending upwardly from the base and surrounding a periphery of the base, the base and the at least one side wall defining an interior of the tray body, and the at least one side wall having an upper end defining an upper rim of the tray body; (b) a removable top bonded to the upper rim for sealing the interior of the tray body; and (c) a powdered plant treatment agent in the interior of the tray body and supported on the base when the tray body is upright.

Abstract: A pot assembly is provided with a saucer, and a pot with a base pivotally connected to, and supported upon the saucer. A cam surface is provided between the saucer and the pot so that rotation of the pot in a first rotary direction relative to the saucer extends the pot from the saucer, and rotation of the pot in a second rotary direction relative to the saucer retracts the pot to the saucer.

Abstract: The invention discloses a tray (100) for growing agricultural products (111), particularly for vertical farms, comprising a rigid single-block structure having a base (101) that is closed on all the perimeter sides by a containment edge (104), the base (101) and the containment edge (104) forming a hollow body hermetically sealed towards the environment outside the tray (100).

Abstract: The formation mechanisms of devastating Hurricanes and Typhoons in the Northern Equator were analyzed. These Hurricanes and Typhoons have taken lives, property and devastation to the environment. We created a solution to save lives and the environmental effects. Hurricanes and Typhoons were found to form by the following two mechanisms: Mechanism (I): “High Sea-Surface Temperatures” along the Equator zone. Mechanism (II): “Anti-Clock-Wise Strong Westward Winds” along the Equator zone. We can prevent Mechanism (I). Various experiments were performed to prevent Mechanism (I). Results: spraying sea-water above the forming zone for about 20 min. reduces the Sea-surface temperature to 15.0° and prevents formations of Hurricanes and Typhoons. Also, as the best way to carry-out this process, is to find the high temperature zones by helicopters or drones equipped with Infrared-thermometers and guide Fireboat-fleets to the location even before the formations of Hurricanes and Typhoons.

Abstract: A backpack blower is provided with a water spray capability to suppress the generation of dust when used as a blower, and to also allow for use as a basic power washer. A leaf blower power unit having an engine driving a fan is interconnected with a wand having an outlet orifice. A spray nozzle is positioned within the wand adjacent the outlet orifice. A source of liquid to be sprayed is interconnected through a control valve to the spray valve such that a spray of water can be introduced into the vortex of the air being emitted from the wand. Both the speed of the airflow and volume of the water being introduced into the vortex may be regulated by the user in accordance with the use to which the unit is put.

Abstract: A turf sweeper includes a hopper mounted on a frame. A debris loading duct mounted on the frame includes an intake opening supported in closely spaced relation above the ground and a discharge opening at a discharge end communicating with a hopper inlet. A broom is rotatably mounted within an intake section of the debris loading duct proximate and across the intake opening. A paddle rotor, having a plurality of paddles outwardly projecting paddles is rotatably mounted within and across a transfer section of the debris loading duct with a path of rotation of tips of the paddles extending in closely spaced relation to a path of rotation of tips of the pick-up members of the pick-up head. A return air duct flow connects a return air outlet to the hopper with a return air opening through the transfer section of the debris loading duct.

Abstract: Embodiments described herein are directed to an apparatus for determining a direction in which a tree will fall and a method for using the apparatus. The apparatus may comprise a plate including a substantially straight edge suitable for alignment with a vertex formed by a top cut and a bottom cut of a notch cut into a tree and a substantially level bottom surface suitable for stable placement upon the bottom cut of the notch. In some embodiments, the plate may define an internal cavity sized to accommodate a laser light generator. In other embodiments, a rotatable housing including a cavity sized to accommodate a laser light generator may be adjoined to the plate. Embodiments may permit a laser light generator contained within the cavity or the housing to emanate a beam of laser light in a direction that is substantially perpendicular to the substantially straight edge of the plate.

Abstract: A method of using a system to apply liquid over a selected area includes providing a source of liquid, a first tube for transporting liquid from the source through the system, a connector, a check valve and a spray device. The connector includes a projection extending into the first tube. The projection has an inlet in fluid communication with the first tube. The connector further includes an outlet and a passageway in fluid communication with the inlet of the projection and the outlet of the connector. The check valve has an inlet in fluid communication with the outlet of the connector and an outlet. The check valve is operable to permit the passage of liquid from the inlet to the outlet upon pressurization of the liquid above a threshold pressurization level.