Abstract: A tank apparatus is disclosed for holding a reserve supply of coolant for a radiator on construction or industrial vehicles. A dual enclosure of rigid material coacts with a radiator guard on a vehicle to define a tank receiving space of prescribed shape within the radiator guard, with the tank receiving space being open to an aperture formed in the top of the radiator guard. A tank fabricated of sheet rubber is relatively closely received in the tank receiving space so as to be held in all parts against the rigid enclosure. The tank has a mouth which is disposed in register with the aperture in the radiator guard and which is closed by a flat closure member of rigid material. The closure member is detachably fastened to the enclosure and is exposed through the aperture in the radiator guard for the installation of a filler neck with a cap.

Abstract: An automatic tire inflation-pressure regulating system for wheeled vehicles with pneumatic tires. The system has a system control assembly in the vehicle operator's compartment, control signal transmitter assemblies on the vehicle body in close proximity with each vehicle road wheel, and a tire pressure-regulating wheel assembly on each wheel. The transmitter assemblies convert electrical command signals initiated by the control assembly to RF signals that are received by an electronic module in each wheel assembly. Means in each wheel assembly selectively deflate or inflate their respective tires in response to the RF control signals. Gas under pressure for inflating the tires is provided either by a plurality of gas generators or by a pressurized gas-generating liquid.

Abstract: A vehicle wheel-tire assembly wherein the tire has a low inflation pressure (large tire footprint) in a low vehicle speed range, and a large inflation pressure (small tire footprint) in a high vehicle speed range. The tire is partitioned into a series of circumferential compartments, with each compartment being provided with a valve mechanism for introducing air into the compartment and/or withdrawing air from the compartment as needed to maintain desired inflation pressures in the different vehicle speed ranges. The system is contained entirely in the wheel-tire assembly; no external air compressors or control valves are utilized.

Abstract: A shutoff valve for the downspouts of fuel trucks or tankers, the shutoff valve being installed at the inlet of a downspout and serving to seal off the inlet of the downspout until such time as overflow fuel or other liquids can be safely drained off from an overflow liquid well provided at the top of the tank. The valve includes manually actuatable means for opening the valve and also includes means for automatically closing the valve in the event of a fire.

Abstract: A hydraulically driven track-type vehicle having conduit assemblies for hydraulic fluid connected between hydraulic motors respectively mounted on track frames for driving the vehicle and hydraulic fluid pipes mounted on the vehicle body. Each of the conduit assemblies comprises flexible pipes connected between the hydraulic fluid pipes and respective one ends of passages formed in a member for pivotally mounting thereon each of the track frames, and conduits of steel pipes connected between respective other ends of the passages and each of the motors. The mounting member pivotally mounted on each of pivot shaft casings projecting outwardly on both sides of the vehicle body.

Abstract: A method for cleaning a septic tank provided with at least two successive fermentation and decantation compartments connected to each other by a lateral opening. According to this method, the light and/or heavy sludges contained in each compartment are pumped and discharged in a waste tank whereas the bacteriological liquid medium of both compartments is pumped out and stored in a storage tank. The liquid medium kept in the storage tank is reintroduced into the septic tank after the same has been cleaned, to reactivate said tank thereby making it immediately operative. A tanker especially designed for carrying out this method is also disclosed.

Abstract: A valve for vehicle liquid heating circuits that includes a sealed case, an inlet, an outlet and a mechanism for opening and closing at least one of said inlet and said outlet. The valve includes a guide means for mounting a member having a rack thereon and rotatable means with a toothed segment engagable with and actuating the rack along the guide means to move a valve plug into and out of engagement with a seat located at either said inlet or said outlet. A rotatable cylindrical element that includes said toothed segment extends through said sealed casing to accept a lever for actuating the segment to thereby move the rack and its associated plug.

Abstract: A hydraulic master cylinder for a motorcycle includes a body defining an oil reservoir therein which is mounted in an axially aligned relationship with the handlebar. The body may be formed separately from, or integrally with, the handlebar.

Abstract: An inexpensive owner installable remotely controlled drain valve for the crankcase of a motor vehicle utilizing a valve having a rotatable stem therein. Rigid extensions with universal joints therebetween are coupled between the valve stem and a locking means located under the hood of the vehicle. Rotation of the free end of the device opening and closing the valve to permit controlled drainage of the crankcase.

Abstract: In the very large hauling vehicles (10) it is desirable to provide the front and rear wheels (20,16) with multiple disc brake assemblies (32) that have retarding capabilities. It has long been a problem to route a conduit (34,36) of a size large enough to carry the required volume of cooling oil, between a frame (12) of the vehicle (10) and the front wheels (20). The front wheels (20) present a particular problem in that they usually move vertically along an axis (28) of a suspension strut (22) to which they are mounted, as well as pivoting about the axis (28) for steering functions. A conduit (34,36) that has sufficient length to accommodate the extremeties of the compound motion will often come in rubbing contact with the surrounding structural members which results in wear and premature failure of the conduit.

Abstract: In a mobile liquid supply tank, such as a water tank for use as fire fighting apparatus, a hollow tank is provided with at least one fill neck and an overflow relief valve on the upper surface portion of the tank. A pressure fill valve is also provided near the lower portion of the tank for emptying or filling the tank. Each fill neck includes a buoyant float disposed within the tank that seals the fill neck when the tank is substantially filled with liquid. The overflow valve, adapted to open when the pressure within the tank exceeds a predetermined value, is preferably located in a recessed portion of the tank. A drain pipe extends from that recessed portion through the tank and exits from the bottom of the tank to discharge liquid overflow away from the forward path of the rear traction wheels of the transport vehicle.

Abstract: An apparatus incorporating a normally-closed check valve mounted on the inlet end of a vapor withdrawal conduit and located in the upper vapor portion of a partially filled pressurized LP gas tank on a recreational vehicle or the like. The outlet end of the vapor withdrawal conduit extends to a point lower and exterior to the volatile liquid container and is connected to a control valve to stop the flow of fluid. As the control valve is opened to allow fluid to pass. Then the pressure in the vapor withdrawal conduit drops. The check valve opens and allows gases from the volatile liquid container to pass down the tube. After the control valve is closed, the pressure in the vapor withdrawal conduit increases till it equals the pressure in the container. The check valve closes and stops the flow of fluid.When the apparatus is used in a movable mode, such as on a vehicle, the check valve is closed, preventing the volatile liquid contained in the container from being splashed into the vapor withdrawal conduit.

Abstract: An automatic tire inflation/deflation system for a vehicle (10) is disclosed. Air passageways for the pressurize air are provided internally through the wheel assemblies without cutting into load bearing members. A rotating seal is provided by way of a pair of sealing rings (52,54) located inboard of the hub bearings (32,33) to protect the seals from adverse environmental conditions. A kit for retrofitting vehicles to include an automatic tire inflation/deflation system is also disclosed. Ramp surfaces (90, 91, 92) formed in the hub (30') are provided to facilitate removal of the bearing assemblies (32, 33).

Abstract: A vehicle for use in the servicing of aircraft, particularly in the removal of feces from toilets of passanger aircraft, comprises a chassis and a body which is mounted on said chassis and has only a small height so that the vehicle can be moved under aircraft portions having only a small ground clearance. A cage comprising a working platform is mounted on the vehicle near its rear end and by means of an upright hydraulic cylinder having a telescopic piston is adapted to be raised from a position of rest, in which the cage is flush with the top of the body. To permit the use of a telescopic piston having large length sections, the hydraulic cylinder extends at least through a major portion of the height of the body. The working platform is disposed on the rear of the hydraulic cylinder.

Abstract: A tubing assembly provided between two movable bodies such as front and rear body portions of a three-wheeled motor vehicle. The front body is laterally swingable relative to the rear body and these bodies are relatively movable along longitudinal and vertical directions thereof. The tubing assembly includes a first flexible tubular member extending substantially vertically and having one end connected to a first rigid tubular member of said front body portion, a second flexible tubular member extending substantially horizontally and having one end connected to a second rigid tubular member of said rear body portion, and a generally L-shaped intermediate rigid tubular member connected between said first and second flexible tubular members. The tubing assembly is positioned outwardly offset from a rotational center of said movable bodies and at the same longitudinal side of said vehicle.

Abstract: A vehicular concrete pump assembly having a semitrailer and a truck tractor interconnected therewith with a mechanism being provided on the semitrailer for elevating the truck tractor and supporting it in the raised position while the semitrailer is braced on the ground by extendable support legs to enable the raised truck trailer to operate as ballast to stabilize the semitrailer against the weight of an articulated concrete distribution pole having a concrete line through which concrete is distributed by a pump on the semitrailer.

Abstract: A fuel transport land vehicle formed by a tractor and a trailer carrying fuel in which the tractor has a plurality of axles all of which are steerable. The tractor and trailer are detachably coupled so that they remain along the same general longitudinal axis and sideways relative motion between the tractor and trailer is prevented. A pumping module is removably coupled to the vehicle and has disposed therein means for pumping, filtering and modulating the flow of fuel from the trailer.

Abstract: The intake fitting of a vehicle engine driven pump mounted on the engine block is connected to one end of an elongated, flexible conduit section acting as a fluid storing reservoir. The other open end of the conduit remote from the pump is anchored at a location in the engine compartment of a vehicle above the pump and readily accessible for servicing and oil level monitoring. A removable cap closes the open end of the conduit section.

Abstract: A keeper (10) is adapted for installation on a rear panel of a truck cab for holding a pair of gladhands (18,20) and an electric plug (22). The keeper is a one-piece unitary structure of molded plastic. It comprises a pair of gladhand receptacle members (32,33) and a plug receptacle member (34). The receptacle members are mounted on a panel of the cab by mounting brackets (24,26). The gladhand receptacle members (32,33) each defines a gladhand receptacle slot which receives a gladhand by insertion and rotation in a plane perpendicular to the mounting panel. The receptacle member (34) for the plug comprises a vertically disposed socket (50) between the pair of gladhand receptacle members (32,33).

Abstract: A drain valve assembly for attachment to the threaded drain opening of an automobile crankcase is disclosed. A drain plug, which is engageable with the threaded drain opening of the automobile crankcase, is provided with an axially extending bore which defines a drain passage in communication with the crankcase. A counterbore formed in the tightening head of the drain plug defines a valve seat. An anchor plate is fastened to the underside of the crankcase by the drain plug. A valve release plate is moveably coupled to the anchor plate for movement from a valve closed position to a valve open position. A resilient, compressible valve head is mounted on the valve release plate for movement into and out of sealing engagement with the valve seat in the valve closed and valve open positions, respectively.

Abstract: A flexible hose assembly (10) transmits fluid between relatively movable components, such as a drive motor (16) secured to the main frame (14) of a vehicle (12) and pressurized fluid supply ports (13) resiliently supported on the main frame (14), in a constricted region where typical hose motions could result in chafing or cutting from contacts with adjacent structure. A flexed portion (39) of the hose (38) extends within a curved tubular rigid sleeve (47) which is fixed relative to one (16) of the fluid transmitting components (16, 13) and free of rigid attachment to the other (13). The diameter of the inside passage (51) of the sleeve (47) is greater than that of the hose (38) enabling limited necessary flexing while preventing more sizable and potentially damaging hose (38) movements. The curved hose portion (39) may have a radius of curvature smaller than the normal minimum bending radius as the sleeve (47) restrains kinking by preventing concentration of bending forces at one point on the hose (38).

Abstract: Individual rotary flow control valves associated with and metering hydraulic fluid flow through one or more directional control valves mounted on a tractor frame are connected by flexible push-pull cables to respective control sectors located adjacent the tractor seat so that an operator may control the flow rate to a remote hydraulically driven or adjusted implement from the tractor seat.

Abstract: A security device for vehicle tanks is provided which automatically assures the closing of tank valves when the tank is being filled or emptied and the vehicle is subjected to accidental displacement or other movement. The devie includes a vehicle displacement detector assembly comprising an oscillating arm which contacts either the ground or an element which moves the vehicle. Movement of this assembly, in turn, drives a transmission assembly, which is activated by the displacement of a roller driven by an oscillation shaft of the detector assembly. This transmission assembly is, in turn, connected to and controls a tank valve control.

Abstract: A locking fluid valve assembly including a housing adapted for connection to a fluid reservoir such as an automobile crankcase, a valve piston member for sealing and unsealing a drain passage through the housing and a piston closure member which is held under tension against the outside wall of the housing when the valve is closed.

Abstract: The invention relates to a multiple coupling for lubricating systems, preferably progressive lubricating systems of motor vehicles, especially tractor trailer units. The multiple coupling a plug box and a plug, with the help of which several lubrication pipes may be interconnected. In order that the plug box-plug-combination may be used for variable number of lubrication pipes, a special valve arrangement has been provided with the help of which the desired number of passages of lubrication pipes is opened or closed.

Abstract: Electro-mechanical, milk transfer systems which interlock the dairy farmer's milk holding tank agitator and the pump for drawing milk from the tank into a milk transport vehicle to preclude energization of the pump until the agitator has operated for a minimum, predetermined time; tamper proof circumvention-preventing devices to preclude by-pass of the interlock systems during milk transfer to the transport vehicle; and milk sample-taking units for automatically taking one or more samples of the milk being pumped into the transport vehicle.

Abstract: My invention particularly relates to an apparatus designed to provide the means of checking and replenishing the air supply in a pneumatic spare tire that is stowed in a specially designed carrier or receptacle located in a rearward underslung and inaccessible location as has been adapted to many motor vehicles in use today, including various foreign and U.S. manufactured pick-up trucks, station wagons, recreational vehicles, sports cars such as the U.S. manufactured Chevrolet Corvette and to a lesser extent certain compact automobiles. This represents a departure from the traditional practice of enclosing the spare tire either in a closed compartment or trunk within the body of the vehicle.

Abstract: PCT No. PCT/US 79/00837 Sec. 371 Date Oct. 10, 1979 Sec. 102(e) Date Oct. 10, 1979 PCT Filed Oct. 10, 1979Pneumatically operated control mechanisms (10-18) for vehicles have often been found to leak control fluid during start-up in extreme cold conditions until attaining normal operating temperature. It has been discovered that the problem lay in loss of resiliency of poppet valves (21) because of the exposure of the elastomer seals (24,26) to extremely cold ambient operating conditions. The problem has been solved by heating the incoming air. Reliable heating is accomplished under extreme cold conditions by use of a fluid heater (40) having an elongated heating member (41) and inner and outer sleeves (48,51) around the heating member to provide inner and outer annular spaces (49,52) through which the fluid to be heated flows in counter-current directions.

Abstract: A crankcase drain valve assembly for replacing the standard oil drain plug commonly used for draining used oil from the crankcases of most internal combustion engines. The assembly includes a valve housing for mounting in the drain opening of the crankcase formed with a central passage therethrough and a transversely extending valve opening intersecting the central passage. A valve member is pivotally attached to the valve body and is formed to move in and out of sealing engagement with the central passage. A lever attached to the valve member permits opening and closing of the valve member without any special tools. The valve member is held in the closed position by rotating a lever until a boss on the lever arm is received in a detent in the valve housing.

Abstract: A mobile cleaning unit for providing a high pressure cleaning spray, comprising a van-type vehicle with separate sources of water and cleaning and treating solutions. Valves, one associated with each source, determine the composition of the cleaning spray by individually controlling both the introduction and the proportion of cleaning or treating solution introduced into the water as it is used in cleaning. The individual valves are successively operated in response to each initiation of flow from the source of water. The cleaning or treating solution from a particular source to be used is selected by starting and stopping flow from the source of water by operation of a flow control valve at the spray applicator.

Abstract: A portable eduction unit includes a tank, a single first hose for extending into a source of solids and liquid, such hose being connected to the tank through a check valve which opens in response to a partial vacuum in the tank. A hose within the tank has one end supported by a float and communicates with the first hose through a check valve that opens in response to pressurization of the tank, and a shut-off valve for controlling the flow between the first-mentioned hose and the check valves.

Abstract: A dump valve assembly for opening and fluid-tightly sealing the drain outlet of a waste tank, the assembly comprisng a rotatable elongated shaft having a handle at its upper end and a first or lower compression plate adjustably secured to its lower end. Disposed concentrically about the shaft are a first and second tubular member, the former having a length less than that of the shaft, and the latter having a length less than that of the first tubular member. Fixedly secured to the lower end of the first tubular member is a second or upper compression plate spaced from the lower plate. Sandwiched and pre-loaded between the upper and lower compression plates is a valve plug made of an expandable material. The shaft is provided with a double-thrust ball bearing which abuttingly engages the upper end of the first tubular member to permit independent rotation of the shaft relative to the former member.

Abstract: A molded plastic drain valve particularly adapted for use with automobile radiators to discharge fluid from a header tank. A drain housing or body of metal is attached by brazing to the tank wall and has an internally threaded bore therethrough terminating in a smaller drain opening encircled by a valve seat formed thereabout. A plastic valve has an external threaded portion and an axially faced sealing portion which moves to engage the valve seat of the housing. The assembly includes a unique means to prevent separation of the valve and housing including a stem which extends from the valve through the drain opening in the housing. It has a head or end portion of slightly less diameter than the drain opening and a small channel or groove located at its back side. A resilient washer member of elastomeric material is supported in the groove and its diameter is significantly larger than the drain opening.

Abstract: A centralized deicing system includes, in one embodiment, a large fixed location supply tank of deicing fluid which is heated and supplied to a plurality of terminal boxes located at several aircraft loading ramps. The system includes a recirculation loop for preheating the conduits for the deicing fluid by circulating heated deicer fluid through them before application to an aircraft. Each terminal box includes a coupler for receiving ends of a hose employed on a movable vehicle used for deicing an aircraft to also preheat the hose. In one embodiment of the invention, separate tanks of water and glycol are provided, and the terminal box includes a mixing valve which can be remotely controlled by an operator for blending the heated water and glycol in the desired proportion depending on weather conditions.

Abstract: A cleanable drainage arrangement for fluent products overflowing from the dam or reservoir of a tanker vehicle including a chute or outwardly opening trough having a removable translucent cover plate to accommodate periodic inspection and cleaning during field use.

Abstract: A valve device for draining liquids from a tank and, more particularly, a valve device for draining lubricating oil from an engine crankcase. The valve of the invention is characterized in having a generally tubular valve casing, containing a valve element spring-biased into closed position, which is permanently threaded into an opening in a tank. To open the valve and drain the contents of the tank, a pressing sleeve is inserted into the valve casing, this pressing sleeve serving to engage the valve element and unseat it as the sleeve advances into the casing by turning a cap nut which threads onto the casing, whereupon liquid will flow through the now-open valve and the pressing sleeve to a sump or the like.

Abstract: A one-way valve is provided which may be releasibly attached to a wheel brake cylinder of an automobile for bleeding the brake system of any air existing in such system. The bleeder valve has a quick disconnect which may be snapped over the bleeder outlet in sealing engagement therewith.

Abstract: Natural gas from one or more wells is gathered, dehydrated, compressed to a relatively high pressure, and loaded into pressure vessel means mounted for transporting at ambient temperatures by a transport vehicle. The pressure vessel means is then driven to a transmission pipeline terminal, or other end user, and the natural gas is off-loaded while being heated to prevent the formation of harmful hydrates, the gas being metered before flowing into the pipeline.

Abstract: A vehicle with operationally conditioned vacuum loads and comfort vacuum loads, in which a central distributor box is provided that is equipped with a feed connection to connect a distributor chamber with a vacuum source; at least two load chambers are also provided in the distributor box, whereby each load chamber is connected with the distributor chamber by way of a protective valve opening in the direction to the distributor chamber against a spring force, and with a load connection which is in communication with a test connection that opens into the atmosphere after overcoming a spring-loaded valve.

Abstract: A valve group subassembly for use in a vehicle having hydraulically operable mechanisms. The subassembly includes the main valve and actuators, interconnecting duct structures, and a mounting bracket permitting the complete subassembly of the control elements. A pilot valve manifold is mounted to the bracket for hydraulic connection thereto of the pilot valves. The bracket may be resiliently mounted. The valves may be provided with removable valve stems, permitting the valve bodies to be maintained mounted to the bracket in servicing the individual valves. The subassembly is arranged to permit a bench testing thereof prior to the installation in the vehicle.

Abstract: At least three elongated flexible elements bonded together lengthwise to form constraint means arcuate in cross-section for forcing said elements to move in a predetermined path in which the flexible elements are bent longitudinally to form a loop of substantially uniform radius intermediate the ends thereof so that at least a portion of the loop is forced into a flat cross-section while the straight portions or trailing lengths of said elements on opposite sides of the loop are self-constrained in relatively stiff and straight runs whether either straight portion is pulled or pushed in relation to the loop, such that the flexible elements move as if reeved on a reel, sheave or the like.

Abstract: The present invention relates to a safety warning system for an LP (liquefied petroleum) gas or other hazardous material transporting vehicle or the like, wherein said safety warning system appraises the vehicle's operator of the possibility of a hose connection extending between a tank carried on the transport vehicle and a second remote main supply or customer's tank.

Abstract: The drain device disclosed is for removing or draining oil from oil pans utilized on engines of automobiles and similar vehicles. The improved device is mounted in the oil drain outlet of the oil pan and includes a valve which, when opened, permits the oil in the oil pan to drain from the oil pan and which, when closed, prevents the draining of oil from the oil pan. The valve is actuated by a handle or knob which is mounted on the dashboard of the automobile or vehicle.

Abstract: An intake air system for an internal combustion engine having an upright stack mounted on vehicle structure, as a hood, with a stack connecting assembly. An air precleaner is mounted on the upper end of the stack. The lower end of the stack is connected to tubular members which leads to the air cleaner of the engine. The mount structure for the stack has an adjustable clamp using a split ring to selectively hold the stack in a predetermined position on the vehicle.

Abstract: An automatic safety brake system for use with the air brake system of a tank-type vehicle for transporting and delivering volatile liquids. The automatic safety brake system has a connector to which hoses are connected for delivering liquid to or from the vehicle tank. A port is formed in the connector and has one opening which is connected by a hose to the emergency air line of the vehicle air brake system. Another opening of the port is adapted to contact in sealing engagement with a removable sealing cap, the cap also covering the opening of the connector through which the liquid flows to and from the vehicle tank. Tightening of the sealing cap on the connector seals the port allowing pressure to build up in the emergency line of the vehicle air brake system. Loosening of the cap opens the port to atmosphere thereby exhausting the emergency line of the vehicle air brake system and automatically applying vehicle brakes.

Abstract: An accessory device attachable to a vehicle for pumping gasoline from the attached vehicle into a portable tank or into the gasoline tank of a disabled vehicle. The device includes a flexible hose permanently connected by a valve to the supply tube in the attached vehicle leading from the gasoline pump to the carburetor of the vehicle; together with a fixture mountable in the interior of fender of the attached vehicle about which the hose may be wound, when not in use. A valved outlet nozzle is mounted to the free end of the hose. The valve unit joining the hose to the vehicle supply tube is in the form of a tee connection with a rotatable valve cock that serves to connect the supply tube from the pump only to the carburetor tube or alternately to join the supply tube to both the carburetor tube and to the flexible hose.

Abstract: A single lever control arrangement for selectively actuating a pair of first and second valve spools reciprocally mounted in a housing comprises a handle assembly including a triangular plate pivotally mounted on the housing by a first ball and socket connection. The first and second valves are pivotally mounted to the plate by second and third ball and socket connections, respectively, whereby the valves may be reciprocated by the handle assembly separately or simultaneously.

Abstract: A fail-safe interlock system is disclosed for use in conjunction with a truck which has a filler valve for the loading of product, and which eliminates the safety hazard of driving the truck away from a loading facility while a loading hose is still connected to the vehicle's filler valve. Movement of a shield in a direction which permits clear access to the end of the filler valve causes the vehicle's ignition circuit to be broken, thereby preventing driving of the truck while the loading hose is connected to the end of the filler valve; and correspondingly, movement of the shield in the opposite direction to where it at least partially covers the end of the filler valve causes the restoration of the ignition circuit, thereby permitting driving of the vehicle after the loading hose has been safely disconnected.

Abstract: An intake air system for an internal combustion engine having an upright stack mounted on vehicle structure, as a hood, with a stack connecting assembly mount structure having a first plate secured to the stack and a second plate accommodates nut and bolt assemblies to secure the stack to the vehicle hood. An air precleaner is mounted on the upper end of the stack. The lower end of the stack is connected to tubular members which leads to the air cleaner of the engine. The precleaner has a cylindrical house surrounding a separation chamber. A vane assembly has a plurality of circumferentially spaced vanes providing an inlet passage open to the chamber for directing the air and particles into the chamber in a circular motion. A sleeve is centrally attached to the vane assembly and has a central outlet passage for carrying cleaned air from the chamber.

Abstract: A closed agricultural chemical batching, measuring and mixing system is disclosed for mounting to a sprayer tending truck. The system includes a measuring tank on which a partial vacuum is drawn by opening a connection to the intake manifold of the internal combustion engine of the truck. The measuring tank is in turn communicated to at least one manifold having numerous valve control inlets, all communicated to discrete agricultural chemical containers which can include highly toxic liquid chemicals. At the inlet remote from the mixing tank, the manifold communicates to a supply of surfactant. Preselected amounts of the liquid chemicals are sequentially drawn by the partial vacuum through the valve controlled manifold and to the measuring tank in which they are accumulated. The surfactant is then drawn through the manifold and into the measuring tank to flush the system.