Abstract: In a pump valve head for a high-pressure pump having at least three pistons, the axial support of the parts surrounding the inlet valve in the intake connection is hydrostatically enhanced. For this purpose, a fluid flow path is provided between the interior space of the intake connection adjacent the end of the side thereof which faces away from the pump cylinder space, said flow path communicating with an intermediate space between a terminal portion of the inlet valve and a closure member affixed to the intake connection, and a region downstream of the pressure valves of the pump discharge connection. This fluid flow path includes a port in a bushing surrounding the pressure valve as well as annular gaps on the outside periphery of a bushing surrounding the pressure valve, a manifold bushing surrounding a pump plunger and a bushing surrounding the inlet valve.

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 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 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.