fig1 shows one preferred embodiment , a system for dispensing flowable materials according to the present invention as shown in fig1 — where dashed lead lines show electrical connections and solid lead lines show hydraulic connections — the system includes controller 10 and associated keyboard 12 , data - storage device 14 ( such as a pcmcia card , hard - disk drive , or cd - rom drive ), and display 16 ( such as an lcd - based flat panel , crt , or plasma display ). controller 10 is electrically connected to , and can electronically control , hydraulic manifold 20 , hydraulic actuators 51 - 57 , float switch 29 in mixing chamber 30 , and flow meter 31 in water pump unit 32 . hydraulic manifold 20 is hydraulically connected to mixing chamber pump 28 , water pump 33 , transfer pump 34 , insecticide pump 36 , sprayer pump 38 , clump busters 41 - 44 , and slide - gate valves 61 - 67 . hydraulic manifold 20 is also hydraulically connected to hydraulic input pump 2 and hydraulic reservoir 4 . hydraulic fluid constantly cycles through the system ; beginning with hydraulic input pump 2 , which pumps hydraulic fluid from hydraulic reservoir 4 , hydraulic fluid is introduced into the system , eventually returning to hydraulic reservoir 4 . slide - gate valves 21 - 24 regulate the introduction of dry granular product from seven hoppers to mixing chamber 30 . slide - gate valves 21 , 22 , and 23 each regulate two hoppers ; slide - gate valve 24 regulates one hopper . hydraulic actuators 51 - 57 actuate slide - gate valves 21 - 24 . specifically , under control of controller 10 , hydraulic actuators 51 and 52 each actuate different portions of slide - gate valve 21 , thus controlling the dry granular product introduction from the two hoppers that slide - gate valve 21 regulates ; hydraulic actuators 53 and 54 each actuate different portions of slide - gate valve 22 , thus controlling the dry granular product introduction from the two hoppers that slide - gate valve 22 regulates ; hydraulic actuators 55 and 56 each actuate different portions of slide - gate valve 23 , thus controlling the dry granular product introduction from the two hoppers that slide - gate valve 23 regulates ; and hydraulic actuator 57 actuates a portion slide - gate valve 24 , thus controlling either a dry granular or liquid product introduction from the one hopper that slide - gate valve 24 regulates . the four slide - gate valves depicted in fig1 are representative of only this preferred embodiment ; as those of skill in the art will recognize , any number of valves could be used . for example , the seven hoppers could be regulated by seven slide - gate valves . or a suitable slide - gate valve could regulate more than two hoppers . in short , according to the present invention , any number of hoppers could be regulated by any number of valves , but one or two hoppers per valve are preferable . in addition , many other valve designs aside from a slide - gate design will be apparent to those of skill in the art . as is described further below , the hoppers are filled with dry granular ingredients to be mixed in mixing chamber 30 , preferably to form a fertilizer select / slurry solution . mixing chamber pump 28 provides material from the mixing chamber to a spray hose . preferably , the spray hose includes a spray nozzle . water pump 33 provides water from a water reservoir ( not shown ) to mixing chamber 30 . flow meter 31 monitors the amount of water so provided . transfer pump 34 may be used to transfer water from an auxiliary a water source ( such as a lake or fire hydrant ) to fill the water reservoir . float switch 29 helps prevent overflow in mixing chamber 30 by providing a signal to controller 10 to stop the water flow from water pump 33 when the material in mixing chamber 30 reaches a certain level . insecticide pump 36 pumps insecticide from an insecticide reservoir to an injection system ( such as the model 40 gpm sold by dosatron int &# 39 ; l inc . ), which combines the insecticide with water from the water reservoir and sends it to a spray hose . one suitable spray nozzle , for example , is the whirijet model ax series - stainless steel or bx series - solid brass spray nozzle . sprayer pump 38 pumps slurry material from mixing chamber 30 to the spray hose . as those of skill in the art will recognize , in other embodiments of this invention one or more of those components , such as the pumps or the injection system , may be eliminated , or additional pumps , injection systems , computer controlled devices or other components may be used . clump busters 41 - 44 are preferably provided to help prevent granular particles from clumping or bridging . in the fig1 embodiment , clump buster 41 interacts with one pair of hoppers ; clump buster 42 interacts with a second pair of hoppers ; clump buster 43 interacts with a third pair of hoppers ; and clump buster 44 interacts with a seventh hopper . as skilled artisans will recognize , one clump buster could interact with any number of hoppers , but one or two hoppers is preferable . the clump - busters required will be designed and made to order in proportion to each hopper &# 39 ; s designated product capacity . a standard size hydraulic actuator will be selected to control each clump - buster . as shown in fig2 , components of a system according to the present invention , such as the embodiment of fig1 , can be mounted on a truck chassis of any size . framing 110 is attached to truck chassis support beams . support beams 131 - 134 are suspended across beams of framing 110 . double slide - gate valve assemblies 201 , 202 , and 203 ( which correspond to slide - gate valves 21 , 22 , and 23 in fig1 ) are installed , respectively , in support beams 131 , 132 , and 133 . single slide - gate valve assembly 204 ( which corresponds to slide - gate valve 24 in fig1 ) is installed in support beam 134 . hoppers 121 - 127 are attached to framing 110 and each engages with an associated slide - gate valve assembly . in the fig2 embodiment , slide - gate valve assembly 201 regulates hoppers 121 and 122 ; slide - gate valve assembly 202 regulates hoppers 123 and 124 ; slide - gate valve assembly 203 regulates hoppers 125 and 126 ; and slide - gate valve assembly 204 regulates hopper 127 . also mounted on truck bed 112 are spindles 130 , which each may hold a length of spray hose 140 . fig3 presents another view of some of the components depicted in fig2 . in this embodiment , one hydraulic cylinder 220 is provided for actuating the portion of double slide - gate valve assembly 201 that regulates hopper 121 , and a second hydraulic cylinder 220 ( not shown ) is provided for actuating the portion of double slide - gate valve assembly 201 that regulates hopper 122 ; a third hydraulic cylinder 220 is provided for actuating the portion of double slide - gate valve assembly 202 that regulates hopper 123 , and a fourth hydraulic cylinder 220 ( not shown ) is provided for actuating the portion of double slide - gate valve assembly 202 that regulates hopper 124 ; a fifth hydraulic cylinder 220 is provided for actuating the portion of double slide - gate valve assembly 203 that regulates hopper 125 , and a sixth hydraulic cylinder 220 ( not shown ) is provided for actuating the portion of double slide - gate valve assembly 203 that regulates hopper 126 ; and a seventh hydraulic cylinder 220 ( not shown ) is provided for actuating the portion of double slide - gate valve assembly 203 that regulates hopper 127 . the seven hydraulic cylinders 220 correspond to hydraulic actuators 51 - 57 in fig1 . regardless of the design size of the select / slurry solution invention , whether it is mounted onto either an electric gold cart type or gas powered mini utility vehicle , having a 100 gallon capacity and being capable of treating 20 , 000 sq . ft . of turf grass , or 80 , 000 + each 6 ″ dia . 6 ″- 8 ″ deep shrub , flower or vegetable plants grown in greenhouses , or in hotel and office building atrium areas , or is mounted on a truck chassis having a 2 , 000 gallon capacity , capable of 600 , 000 + sq . ft . coverage ( 13 . 86 acres ) used for golf course fairways , recreational parks , or large expansive lawn areas , this same precision of custom mixing and applying the required recipe for each plant species on each site can also be achieved . while the embodiment in fig2 and 3 features an arrangement whereby the spray hoses 140 are accessible from the driver side of the truck , in other embodiments one or more spray hoses may be available from the passenger side , the rear , the front , the top , the bottom , or any other portion of the truck . one preferable selection of ingredients to formulate a fertilizer is as follows : hopper 121 would hold 46 - 0 - 0 nitrogen in a soluble , quick - release form ; hopper 122 would hold 38 - 0 - 0 nitrogen in a slow - release form ; hopper 123 would hold 0 - 46 - 0 phosphorous ; hopper 124 would hold 0 - 0 - 61 potash ; hopper 125 would hold iron sulfate ; hopper 126 would hold magnesium and manganese ; and hopper 127 would hold liquid chelated iron . another selection of ingredients to formulate a fertilizer is as follows : hopper 121 would hold 700 pounds of 46 - 0 - 0 urea in a soluble , quick release form ( one suitable product is lesco — urea prill , sprayable ); hopper 122 would hold 600 pounds of 31 - 0 - 0 nitrogen in a slow - release form ( one suitable product is ibdu insoluble slow - release nitrogen ); hopper 123 would hold 600 pounds of 38 - 0 - 0 nitrogen in a slow - release form ( one suitable product is nitroform blue chip urea formaldehyde insoluble slow - release nitrogen ); hopper 124 would hold 500 pounds of 0 - 46 - 0 diammonium phosphate ( one suitable product is lesco — triple super phosphate ); hopper 125 would hold 350 pounds of 0 - 0 - 54 or 0 - 0 - 46 . 6 potassium sulfate or potassium nitrate ( one suitable product is lesco potash ); hopper 126 would hold 250 pounds of iron ferrous sulfate ( one suitable product is iron plus elite 20 % fe , 8 % mn , 5 % mg 7 . 5 % s , 2 % zn labeled and distributed by lesco , inc . ); hopper 127 would hold approximately 10 + gallons of flowable micronutrients of calcium , magnesium , sulfur , zinc , chelated iron , manganese , copper , boron , molybdenum and chlorine ( one suitable pre - blended product is iron + chelated 12 % n , 6 % fe , 2 % mn , labeled and distributed by lesco , inc .). at the beginning of the day , the operator / applicator downloads the appropriate file information for all customers on that day &# 39 ; s route from the company &# 39 ; s database to an on - board dcs ( digital control system ), which includes the functionality of controller 10 . the dcs will provide the applicator with technical history information pertaining to each account . formulating a precise recipe of a nutrient mixture for a particular property is achieved first by visually inspecting the condition and health of all plants and , if necessary , testing the ph of the soil to determine its levels of alkalinity or acidity . next , the size of the lawn is calculated , including adding up the number of all shrubs , trees , and flower planting beds . based on the above , a quantity of nutrient mixture for that property may be established . preferably , a scheduled six application annual fertilization and pest control program is used . at each property , whether residential or commercial , the operator / applicator will begin by engaging the pto ( power take - off ) to start the hydraulic and water pumps that will begin formulating and mixing the recipe to be applied . the on - board dcs will have calculated the approximate number of gallons required for treating the total square footage of either lawn or shrub beds of the property by sending a signal to the appropriate slide - gate valves for the precise amount by mass of each nutrient selected to be mixed into the mixing chamber . the water pump will supply slightly more than the adequate amount of water needed to treat the areas , so that the applicator will have a sufficient amount of mixed select / slurry solution to complete the application . in a preferred embodiment , on average it takes approximately 5 gallons of nutrient mixture to treat 1 , 000 sq . ft . of turf grass spraying at approximately 45 lbs of pressure . applying a nutrient mixture to shrub and tree beds requires 1 to 1½ gallons more per 1 , 000 sq . ft . at 55 lbs of pressure . the slide - gate valves for each nutrient selected will be operating at varying speeds to precisely mix the granular dry nutrients along with water in the mixing chamber to achieve the nutrient mixture required . example : property “ a ” has approximately 7 , 000 sq . ft . of lawn area to be treated with a recipe that calls for applying ½ pound of nitrogen ( n ) per 1 , 000 sq . ft ., including phosphorous ( p ) and potash ( k ), mixed together in the respective weight percentages to the total amount of n desired . the original assessment determined that the ½ pound of nitrogen to be applied for this first application is to be made up of ¼ pound 46 - 0 - 0 ( water - soluble urea ) stored in hopper 121 and ¼ pound 31 - 0 - 0 ( water - insoluble isobutyidene diurea ibdu ) stored in hopper 122 , or any other water insoluble nitrogen source available that releases slowly and evenly . as the on - board dcs sends command signals , hopper 121 and hopper 122 with their respective slide - gate valves will begin to operate at speeds that continuously supply the precise ¼ pound amount required from each hopper into the water filled mixing chamber . substantially simultaneously , the select / slurry solution is discharged through the hose , applying the precise nutrient mixture recipe of the combination of the two to achieve the ½ pound of actual nitrogen ( n ) selected per 1 , 000 sq . ft . directly to the designated plants . additionally , at substantially the same time , hopper 123 and hopper 124 are also operating at speeds to supply substantially continuously and simultaneously the p and k nutrients and their respective weights in proper proportion to the nitrogen ( n ) required for the nutrient mixture recipe chosen . if a recipe is required to use three different nitrogen ( n ) sources — for example , phosphorous ( p ), potash ( k ), and iron sulfate ( fe )— and other micro - nutrients , all seven hoppers and their respective slide - gate valves would be operating continuously and simultaneously to supply the maximum number of nutrients to the water filled mixing chamber by their respective weights to achieve the custom blended select / slurry solution recipe . when the recipe calls for an increase of the nitrogen ( n ) source in ¼ pound increments per 1 , 000 sq . ft ., the slide - gate valves will increase in speed , picking up the additional poundage or mass of nitrogen , including other nutrients required to achieve the select / slurry solution recipe determined for that property . after the application is completed , whether to the turf grass area or to the shrub and tree beds , or to both , a history is recorded of the exact application for each nutrient and its quantity used per site , and then downloaded into the database for future application considerations . if and when required on a problem lawn that may be infested with weeds , insects , or fungus disease , a separate on - board non - electric injection system of custom selecting a herbicide , insecticide , or fungicide may be employed by using a separate hose reel . water is drawn for this on - site custom mixture from the unit &# 39 ; s water storage tank , accurately injecting the precise amount of each pesticide required to treat the weed , insect , or disease present on the lawn , or on the shrubs and trees . a double slide - gate valve assembly for use with the present invention is depicted in fig4 - 7 . a double slide - gate valve assembly — such as double slide - gate valve assemblies 201 , 202 , and 203 — can regulate the release of material from two hoppers . hopper plates 210 are fixed to the bottom of each of two hoppers , such as hoppers 121 and 122 . the double slide - gate valve assembly is attached to hopper plates 210 via top plate 212 . underneath top plate 212 are valve bodies 214 , each of which includes at one end a hydraulic cylinder mating 216 . hydraulic cylinders 220 attach to hydraulic cylinder matings 216 to enable valve bodies 214 to slide back and forth , thus releasing material from their associated hoppers . underneath valve bodies 214 is pressure plate 218 , under which is pressure plate 218 . attached to the bottom of bottom plate 222 is — material chute 224 , which directs material from the associated hoppers to a mixing chamber . side plates 226 are provided to contain other portions of the double slide - gate valve assembly . a single slide - gate valve assembly for use with the present invention , such as single slide - gate valve assembly 204 , can regulate the release of material from one hopper . in view of a double slide - gate valve assembly according to the present invention , such as that depicted in fig4 - 7 , skilled artisans will be able to realize a single slide - gate valve assembly according to the invention . other valve assemblies that may regulate one , two , or more hoppers will also be apparent to those of skill in the art . moreover , many other valve designs , aside from a slide - gate design , that would be capable of regulating the release of material from one or more hoppers may be utilized .
an apparatus for dispensing and mixing flowable materials that includes at least one hopper connected to a mixing chamber . the apparatus further includes at least one valve associated with the hopper . the valve operates to regulate the flow of material from the hopper to the mixing chamber . the apparatus also includes a controller that communicates with the at least one valve wherein the controller selectively controls the operation of the valve .