Abstract: A valve assembly for a high-pressure pump has a valve housing formed with a central bore centered on a main longitudinal axis and a transverse bore extending radially from the central bore in opposite directions along a transverse axis and subdivided by the central bore into an intake transverse-bore part and an exhaust transverse-bore part. Respective intake and exhaust sleeves are provided in the intake and exhaust bore parts and in turn are provided with respective intake and exhaust valves. A flow-splitting sleeve is provided in the central bore and has a pair of lateral branches opening respectively in the intake and exhaust bore parts into the intake and exhaust sleeves. All three of these sleeves are received in the respective bores with radial play relative to the respective axes and form with the respective bores annular chambers that communicate with one another.

Abstract: An improved device is disclosed for connecting a plunger to a connecting rod of the type having a crosshead connected to the connecting rod, the crosshead having a coupling element with a flange and a coupling nut mounted to the flange. The coupling element is provided with a centering bore and a thrust plate is mounted to the coupling element. The thrust plate has a first side with a centering stud extended into the centering bore and an annular shoulder surrounding the centering stud seated against the flange. The thrust plate has a recess on a second side opposite the first side for receivingly centering an end of the plunger. A clamping assembly for clamping the coupling element includes a collar threadably engaged to the coupling nut.

Abstract: A sealing arrangement for a reciprocating piston pump utilizing at least two sets of seals separately supported at spaced apart locations along the length of the pump cylinder. One of the sets of seals located rearwardly from the other with respect to the discharge end of the pump cylinder is enclosed within a chamber formed by a sleeve positioned around the pump plunger. This rearward set of seals is hydraulically pressurized radially inwardly by the aforesaid sleeve during the discharge stroke of the plunger, thereby creating a sealing clearance which is kept constant and providing an accurate and effective seal.

Abstract: A device for regulating a diesel motor driven feed pump which includes an injection pump associated with the diesel motor to control its operating speed, comprises a load, a variable pressure resistance connected by a feed line in series in series to the feed pump and a sump for the feed pump connected to the pressure resistance. In addition a control circuit is connected to the feed line and it includes a pressure scale portion and a limiting device portion each of which includes a respective pressure scale cylinder and limiting device cylinder portion for their respective coaxially arranged pressure scale piston and limiting piston slidable therein. A differential manometer is connected between the pressure scale portion and the limiting portion and it is admitted with the flow medium of respective differential pressures of the associated cylinders of these portions.

Abstract: A sliding surface packing for use in pumps and particularly high-pressure pumps between spaced apart pair of prop rings and a pump plunger and a pump cylinder wall comprises a plurality of packing rings arranged between the prop rings. At least one of the packing rings comprises a rigid high-pressure ring and at least one packing ring comprises a flexible leakage ring and at least one packing ring comprises a high-pressure ring. A plurality of self-lubricating packing rings form guide rings embedding the leakage ring between adjacent ones of said self-lubricating guides forming a pack of laminations.

Abstract: A conduit-cleaning assembly has a swivel coupling connected between a high-pressure hose and a conduit-cleaning nozzle. This coupling has an outer end tube connected to the hose, an intermediate outer tube threaded with the outer end tube, and an inner tube connected to the nozzle and forming with the outer tubes an axis-defining passage for liquid to flow into the nozzle from the hose. This inner tube is partially received in the outer tubes and has an inner-tube end whose outer edge engages an annular seal whose outer periphery is locked to the outer end tube. A bearing is provided between the inner tube and the intermediate tube to allow the parts to rotate relative to each other. The annular seal has a pair of opposite pressure-equalizing surfaces both exposed to the full pressure inside the swivel.

Abstract: A valve assembly for a high-pressure pump has a housing forming a valve chamber connected to the pump chamber and having a generally annular intake port which opens at an internal surface of the housing. An abutment is provided in this housing spaced from the surface and an annular valve disk is displaceable a relatively short distance in the housing between a closed position engaged over the intake port and an open position spaced from the intake port and resting against the abutment and serves as the sole support for this disk. One or more valve bodies are similarly solely supported by a spring may be provided at the exhaust port for closing same during the intake stroke of the pump.

Abstract: A conduit-cleaning nozzle mounted via a swivel on the front end of a high-pressure hose has a nozzle body which is elongated along and generally centered on a longitudinal axis. This body has axially tapered front and rear ends and is formed at the rear end with an axial-symmetrical liquid-distribution compartment having at least one backwardly and normally downwardly opening liquid-ejection aperture. Water supplied at high pressure to this compartment is ejected downwardly and backwardly from the aperture. The angular orientation of the aperture is established by an off-center mass which is fixed in the nozzle body and which imparts to it a center of gravity which is offset below its central symmetry axis, so that the nozzle is self-righting.

Abstract: A high-pressure pump has a housing whose cylindrical chamber is subdivided by a piston into a fixed-volume compartment and a variable-volume compartment. An orbital crank is connected via a connecting rod to this piston to reciprocate it in the housing and thereby cyclically increase and decrease the volume of the variable-volume compartment. This variable-volume compartment is connected via a downstream conduit and a checkvalve to a supply of liquid lubricant, and to an upstream conduit and an upstream checkvalve both to the fixed-volume compartment and to the joints or bearings at the end of the connecting rod.

Abstract: A high-pressure liquid-jet gun has a pistol-type housing provided with a valve having an actuation member displaceable between a closed position and an open position to release liquid from an end of the housing. A safety lever is displaceable on the housing between a safety position relatively far from the barrel of the housing and a use position lying against this barrel. A spring urges this safety lever into the safety position. A trigger is pivoted on the safety lever and has a formation which is engageable only in the use position of the safety lever with the actuation member. This trigger can be displaced in the use position of the safety lever between an advanced position with the formation engageable with the actuation member but with this actuation member in the closed position, and a drawn-back position with the formation pressing the actuation member of the valve into the open position.

Abstract: A surface-cleaning apparatus, especially for street cleaning and the cleaning of industrial surfaces, comprises an array of high-pressure water nozzles surrounding a pick-up nozzle whose open end is formed with a flow accelerating hood, the pressure nozzle surrounding this hood being constituted as drive nozzles whose water sprays are trained beneath the collecting nozzle. The collecting nozzle is connected to a suction source which draws the dirty water upwardly after the water is reflected from the surface to be cleaned. The device is mounted upon a vehicle or is displaceable by a vehicle.

Abstract: A shutoff valve for high and maximum pressures comprises a housing with an inlet passage communicating with a discharge passage and having a valve seat therebetween which is closable by a differential piston having one face which is seatable on the valve and an opposite face in a first control chamber. The first control chamber is connectable through a first control valve to a bypass which extends to the discharge passage. In addition a second control chamber is located in the bypass passage and it is regulated by a separate second control valve. A separate control member such as a pivotal lever is associated with each control valve and each must be separately operable in order to permit movement of the differential piston off the valve seat to open the flow passage.

Abstract: An apparatus for treating a surface with a liquid has a support displaceable over the surface and carrying a spray beam itself provided with a plurality of nozzles directed at the surface. A diffuser surrounds a plurality of the nozzles and has a deflector for diverting the streams of liquid emitted by the nozzles so that these streams flow in a direction generally parallel to the surface being treated. Rollers maintain the front face of the deflector a predetermined distance from the surface being treated. The spray beam may be in two sections which are oppositely reciprocated to increase the treatment effect.

Abstract: A device for cleaning surfaces which extend in a vertical plane and particularly ship's sides, tank walls and similar surfaces which are made of ferromagnetic material, comprises a lifting mechanism which has roller means permitting it to run along a ship's railing or similar structure adjacent the top of the surface to be cleaned. The lifting mechanism includes one or more winding drums or hoists which carry support line means which extend from the lifting mechanism to a carrier for a cleaning apparatus. The cleaning apparatus advantageously includes a housing having an undercarriage which is movable along the surface to be cleaned and which includes magnetic means for causing an attraction between the carrier and the surface to be cleaned so that the carrier is held thereagainst during the cleaning operation.

Abstract: A vehicle, contains a washing and vacuuming machine for cleaning streets and similar surfaces, which includes a wheeled body containing a tank which holds cleaning water or a similar liquid, and a pump for directing the water through a spray nozzle which is positioned in a hood located below the body adjacent the ground. A vacuuming suction shoe is located within the hood forwardly in the travel direction in respect to the nozzle so that the nozzle is aimed forwardly toward the intake of the suction shoe which is spaced upwardly from a perimetric skirt element of the hood. The hood is advantageously carried on a separate carriage which is biased by a suitable washing arrangement so that it moves inwardly toward one side of the vehicle, for example, toward the curb side. The carriage is adapted to have guide wheels which engage along the curb so that the vacuuming device and spray nozzle will be directed in a location adjacent the curb to effect the cleaning thereof.