Abstract: A suction cover assembly for a reciprocating pump includes a suction cover nut having a nut face and a thread configured to threadably connect the suction cover nut to a fluid cylinder of the reciprocating pump. The suction cover assembly includes a suction cover having a cover face. The suction cover is configured to be held by the fluid cylinder such that the cover face opposes the nut face of the suction cover nut. The suction cover includes first and second seals having a leakage trap defined therebetween. The leakage trap is configured to trap leakage pressure during operation of the reciprocating pump. The suction cover includes at least one leakage channel that is configured to channel the leakage pressure from the leakage trap to an interface between the cover face and the nut face.

Abstract: A pneumatically driven fluid pump apparatus is disclosed which includes a pump casing having an inner wall, a pump cap secured at a first end of the pump casing, and a liquid discharge tube in communication with the pump cap and extending at least partially within an interior area of the pump casing toward a second end of the pump casing, and where fluid is admitted into the pump casing at the second end. The pump cap has an airflow inlet for receiving a pressurized airflow from an external pressurized air source, which helps displace liquid collecting within the pump casing upwardly through the liquid discharge tube. A flow channeling subsystem is in communication with the airflow inlet and directs the pressurized airflow towards the inner wall of the pump casing to create a swirling airflow within the pump casing that extends along at least portions of the inner wall.

Abstract: A downhole reciprocating pump assembly for pumping wellfluids from a wellbore has a cylindrical barrel and a plunger disposed within the barrel. A plunger adapter for such pump assembly is configured to allow passage of sand or other particles through the adapter and into a central bore of the plunger so that it does not enter the space between the outer wall of the plunger and inner wall of the barrel of the pump assembly.

Abstract: In general, a piston-type pump includes a wash flow path that allows a wash liquid such as water to pass through to provide washing and cleaning as the pump operates. The pump may be used in precision liquid dispensing systems and particularly with liquid solutions that have a tendency to precipitate solid particulate. By washing a portion of the pump piston, the liquid solution being dispensed and any solid particulates may be carried away and removed from the pump.

Abstract: A high-pressure fuel pump includes a housing and a swash plate which is mounted in the housing and is arranged in an oil space of the housing. A drive shaft is connected to the swash plate and passes through a housing opening, and with a seal for the drive shaft, which seal is mounted in the housing in the region of the housing opening. The high-pressure fuel pump has a plurality of pump elements for sucking up, compressing and ejecting fuel, which pump elements can be acted upon consecutively by the rotatable swash plate. In a pump of this type, the fuel pump has at least one magnet, the magnetic force field of which acts on the oil space of the housing. Premature wear of the pump, in particular premature wear of the seal, is avoided since the magnet separates off iron-containing dirt particles found in the oil.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.

Abstract: A downhole pump has a barrel and plunger. The barrel has a first one-way valve and the plunger has a second done-way valve. The plunger reciprocates with respect to the barrel. The plunger has a first end which has a tapered leading edge. Ports are adjacent to the leading edge. The ports communicate with a passage in the plunger. A sucker rod string coupling is located at the plunger first end. The sucker rod string coupling is coupled to walls located between the ports. The end of the sucker rod string coupling that is coupled to the plunger is tapered so that fluid can flow out of the ports. The sucker rod string coupling and the plunger first end form an integral member that couples to the remainder of the plunger.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.

Abstract: A hydraulic cylinder contamination prevention system for preventing large and small contaminants from entering into a hydraulic cylinder, including a hydraulic cylinder rod cover for underwater use with at least one automatic valve for preventing water circulation between the outside environment and the enclosed environment of the cylinder rod cover when the cylinder is stationary, egress of water from the cylinder rod cover when the cylinder is retracted, and ingress of water into the cylinder rod cover when cylinder is extended, and an external and abrasive cylinder rod scrubber.

Abstract: An air cylinder that can prevent foreign substances from intruding inside in an environment where fine foreign substances such as dust are scattered. The air cylinder includes, in a through hole of a rod cover, an annular lubricator impregnated with a lubricant so as to supply the lubricant to the rod and a liquid-absorptive annular dust wiper not containing a lubricant and provided for preventing fine foreign substances such as powder stuck to the rod from intruding inside. The lubricator and the dust wiper are disposed air-tightly and slidably in contact with the rod, and the dust wiper is located closer to a leading end of the rod than the lubricator.

Abstract: A high-pressure fuel pump includes a housing and a swash plate which is mounted in the housing and is arranged in an oil space of the housing. A drive shaft is connected to the swash plate and passes through a housing opening, and with a seal for the drive shaft, which seal is mounted in the housing in the region of the housing opening. The high-pressure fuel pump has a plurality of pump elements for sucking up, compressing and ejecting fuel, which pump elements can be acted upon consecutively by the rotatable swash plate. In a pump of this type, the fuel pump has at least one magnet, the magnetic force field of which acts on the oil space of the housing. Premature wear of the pump, in particular premature wear of the seal, is avoided since the magnet separates off iron-containing dirt particles found in the oil.

Abstract: A high pressure slurry plunger pump is described which provides a clean fluid buffer around the suction and discharge valves of the pump and in some cases in the vicinity of the plunger seal mechanism in order to displace erosive slurry material and thus extend the life of the pump and improve pump efficiency.

Abstract: An improved bonnet assembly for a weir type or radial style valve, comprising a hollow bonnet housing an actuator assembly comprising an actuator connected to a spindle, the hollow bonnet having a plurality of orifices to allow free entry and exit of a liquid such as a cleaning solution within the bonnet and to enable the liquid to thoroughly contact and exit the bonnet assembly without the need of disassembly. The valve or parts of the valve such as the bonnet assembly or its components are made of performance engineered polymeric material to prevent corrosion and/or galling, and also reduce the weight and sometimes the cost of the valve without sacrificing quality and performance.

Abstract: A self-vacuum arrangement for pneumatic equipment is provided. A Venturi device having first and second ports and a central tap is provided. A first check valve having a first port operably coupled with the central tap of the Venturi device is configured to prevent pneumatic flow from the central tap through the first check valve. Optionally included is a second valve having a first port operably coupled with the first port of the Venturi device, and a second port operably coupled with the second port of the Venturi device.

Abstract: According to the present disclosure, a fluid cylinder is provided that is configured to move an object between first and second positions. The fluid cylinder includes a cylinder housing and a shaft configured to move between extended and retracted positions relative to the cylinder housing. Preferably, the fluid cylinder includes a scraper positioned to contact an outer surface of the shaft to remove contaminants therefrom during movement of the shaft. Furthermore, the preferred fluid cylinder includes an anti-rotation mechanism positioned to prevent rotation of the shaft.

Abstract: A fuel injection pump with precipitate inhibiting features includes a pump body that defines a flushing fluid inlet and a flushing fluid outlet that open into a plunger bore. A plunger is positioned in the plunger bore and is moveable between a retracted position and an advanced position. The plunger has a first end separated from a second end by a side surface. A portion of the side surface and the plunger bore define a flush connection passage that connects the flushing fluid inlet to the flushing fluid outlet over a portion of the plunger's movement between its retracted position and its advanced position.

Abstract: An improved pop-up irrigation sprinkler with integral flow control valve, and an improved separate flow control valve, defined by a dual flowpath for pilot flow within the flow control valve; a stem-flushing feature using an interrupter disc (54) mounted on a piston (48), providing a flowpath for a brief hydraulic flushing cycle after a momentary interruption of flow; a direct acting hydraulic pilot valve (92) to permit hydraulic control of an electric type sprinkler or a separate flow control valve; an improvement of the bearing guide (80) by the addition of a resilient barrier seal (84) to prevent seizing of the stem to the bearing guide when fully extended, the seal maintaining a close fit to the stem and yet being sufficiently resilient to permit the flushing of the stem; and a variable orifice in the inlet to the bonnet chamber to retard the initial opening rate of the valve.

Abstract: A high precision fluid pump for accurately delivering desired amounts of processing fluids, particularly for use in semiconductor processing and semiconductor processors. The fluid is dispensed by a piston driven by a stepper motor with precise electronic control. A rolling diaphragm isolates the stepper motor from the fluid, fumes or gas. To provide a clean environment for high purity applications, the pump is preferably made of PTFE and nitrogen purging is provided on both sides of the rolling diaphragm to reduce particle count and maintain the motor and controller temperature.

Abstract: A piston pump having structure to maintain substantially parallel alignment of a piston rod and a crosshead extension as a crosshead slide undergoes wear. The structure includes a slot defined by the end of the piston rod for receiving a male pilot of the crosshead extension. In a further embodiment, the piston rod has a male pilot and the end of the crosshead extension defines a slot for receiving the male pilot of the piston rod. The slot may be oblong in a direction transverse to the longitudinal axis of the piston rod. The structure may additionally or alternatively include a centering sleeve attached to the outer surface of the piston rod adjacent to and coaxial with the piston. A backflushing system may be used with the sleeve to keep the piston, piston sleeve, and pump cylinder cool. One such system has a conduit connected to the sleeve and in liquid communication with an annular cavity between the sleeve and the pump cylinder to circulate coolant therethrough.

Abstract: A dual-piston pump apparatus includes a pair of reciprocating sleeves within which a pair of reciprocating pistons are disposed. The pistons and sleeves are each supported on a frame for independent reciprocating movement along a line angled relative to horizontal by an angle of less than about 60.degree.. The apparatus also includes a piston construction including a removable face which permits the piston to be broken down for cleaning. Each piston is normally restricted by a stop from extension beyond the end of the corresponding sleeve, but an actuator is provided for freeing the piston relative to the sleeve so that the piston may be extended beyond the sleeve and the sleeve may be withdrawn from a pump chamber of the apparatus.

Abstract: A means and method for protecting the moving parts of a pump that is used to pump air- or moisture-sensitive liquids, comprising blanketing the wetted parts of the pump with an inert medium and/or admixing the process liquid with a low vapor pressure liquid component effective for inhibiting corrosion or particulate formation. In another aspect, the invention relates to an apparatus for protecting the wetted, moving parts of pumps used to pump air- or moisture-sensitive liquids. The apparatus provides a mantle within which an inert medium is flowed around the moving, wetted pump parts to continually purge them of any air or moisture.

Abstract: A means and method for protecting the moving parts of a pump that is used to pump air- or moisture-sensitive liquids, comprising blanketing the wetted parts of the pump with an inert medium and/or admixing the process liquid with a low vapor pressure liquid component effective for inhibiting corrosion or particulate formation. In another aspect, the invention relates to an apparatus for protecting the wetted, moving parts of pumps used to pump air- or moisture-sensitive liquids. The apparatus provides a mantle within which an inert medium is flowed around the moving, wetted pump parts to continually purge them of any air or moisture.

Abstract: A dust guard is provided for a brake actuating mechanism comprising a housing having first and second end walls, an elastomeric diaphragm suspended within the housing, a brake actuating rod disposed within the housing for reciprocating movement relative to the housing and having a first end and a second end, the second end being directed towards the second end wall of the housing, and a spring disposed within the second chamber between the second end wall and the diaphragm. The dust guard comprises a resilient tubular barrier, attached at one to the second end wall, and extending inwardly axially to engage the actuating rod, or structure connected to the actuating rod, to isolate the second end of the actuating rod from the interior of the housing.

Abstract: A piston pump shaft sealing system is provided which prevents particles released from the shaft seal, as a result of wear from entering and contaminating the fluid being pumped. The system features a permeable, deformable disc disposed between the seal and the displacement chamber of the pump. The piston shaft extends through a centrally exposed hole in the disc. In its undeformed state, the hole in the disc is smaller than the diameter of the piston shaft so that when the shaft is forced through the hole, the edges of the hole are pressed against the surface of the shaft, thereby scraping off seal particles deposited on the shaft. Forcing the shaft through the hole also deforms the disk into a conical shape, thereby forming an annular cavity between the disc and the seal which surrounds the piston shaft. The cavity serves to capture and retain the sealed particles, thereby preventing them from entering the fluid.

Abstract: A reciprocating type fluid delivery pump has a driving motor, plungers for driving two pump heads, respectively, and a converting mechanism for converting the rotational motion of the driving motor into a reciprocating motion of each plunger. The converting mechanism includes a cam having such a configuration that, when the driving motor is rotated at constant velocity, the delivery flow rate during the delivery starting period of each of the plungers is in excess of that during the other periods of the cycle. The speed of rotation of the driving motor is reduced during the excess delivery period according to need. Thus, the load on the driving motor is reduced and it is therefore possible to employ a driving motor having a relatively low output. The delivery pump also includes a rinsing chamber for each plunger for allowing pressurized fluid to pass therethrough. The rinse chamber includes a rinse pump which uses the reciprocal movement of the pump piston for the rinse mechanism.

Abstract: A reciprocating pump comprising a cylinder and a plunger reciprocable in the cylinder, a member at one end of the cylinder having an axial passage in which the plunger is axially slidable, and a seal between the member and the plunger. The pump is characterized in having a sleeve for protecting the seal from the effects of relatively high pressure and pressure fluctuations of fluid in the cylinder. The sleeve surrounds the plunger and is fixed in position inwardly of the member and has an axial bore in line with the axial passage in the member. The sleeve blocks communication from within the cylinder to the axial passage in the member except for such communication as there may be through the bore in the sleeve to the axial passage in the member. The plunger is axially slidable in the bore. The sleeve has internal grooving establishing a pressure reducing path for fluid from the inner to the outer end of the sleeve for reducing the pressure and fluctuations in pressure of fluid from the cylinder on the seal.

Abstract: The axial piston pump is provided with two annular seals mounted in the housing and sealingly engaging the piston to define a sealing fluid zone therebetween. An annular ring is provided between the seals to control the flow of sealing fluid through the fluid zone. This ring includes an internal helical flush duct for guiding the sealing fluid helically about the piston from one end of the ring to the other end of the ring.

Abstract: A control system for a pneumatic actuator uses pressurized gases, such as air, as the actuating medium. Such gases and particularly air commonly contain moisture which condenses to form a liquid, such as water, which collects in a closed chamber of an expandable chamber assembly in the pneumatic actuator. In cold climates, the water freezes, preventing proper control of the pneumatic actuator. By providing a control system having a valve positioned elevationally higher or in close proximity to a pneumatic actuator and a tube which extends into the closed chamber of the expandable chamber assembly, water which is contained in the closed chamber is expelled from the elevationally lowest portion of the assembly when the valve is shifted to exhaust the air from the control system.

Abstract: The invention relates to reciprocating pumps for liquids and gases, especially fluid-solid dispersions containing abrasives. The cylinder is made from material which is harder than the abrasive particles of the fluid. This cylinder rotates around the piston, independent of the number of strokes per minute, so that a lubricating film is formed. This rotation prevents both contact between the piston and the cylinder and freezing of the piston within the cylinder.

Abstract: A shaft alignment system for pumps which utilizes a clamp for holding a reciprocating shaft to a piston in an abutting relationship. The clamp can be loosened and retightened after the piston, which is attached to the reciprocating shaft, is inserted in a cylinder. Forces induced on the piston after insertion in the cylinder cause the piston and shaft to be realigned. Resecuring the reciprocating shaft assembly to the piston assembly causes the system to be precisely aligned in a transverse direction.

Abstract: A sprinkler including a housing, a riser and a riser seal element is disclosed. The housing has a hollow interior with an upward-inward slanted, conical shaped seal element receiving slot. The riser is mounted in the hollow interior of the housing for reciprocating motion between an extended sprinkling position and the retracted non-sprinkling position. The riser has an exterior surface along its length and the housing has an interior surface at its upper end between which a gap is defined. The riser seal element is comprised of an elastic material and has an outer portion which is held in the seal element receiving slot to thereby position the seal element in an upward, generally conical orientation. An inner portion of the seal element extends into the gap to form a seal therein for preventing the entry of extraneous material through the gap. The inner portion of the seal element is flexible between an upwardly slanted position and a downwardly flexed position.

Abstract: In an impactor, e.g. a jack hammer, a liquid column is accelerated through an empty barrel 26 and it impacts on a piston surface (34) of the tool (24), e.g. a chisel.

Abstract: In a compressor which includes an upper and lower head portions and an interposed diaphragm, provisions are made for increasing the service life of the diaphragm by reducing the incidence failure of the diaphragm due to fretting products and airborne contaminants, which collect at the outer edge of the diaphragm which results in stress concentrations at the outer edge of the diaphragm, and specifically by providing a plurality of concentric grooves in the upper head of the compressor to remove the fretting products and gas borne contaminants from build up at the outer edge of the diaphragm.

Abstract: A sprinkler including a housing, a riser and a riser seal element is disclosed. The housing has a hollow interior with an upward-inward slanted, conical shaped seal element receiving slot. The riser is mounted in the hollow interior of the housing for reciprocating motion between an extended sprinkling position and the retracted non-sprinkling position. The riser has an exterior surface along its length and the housing has an interior surface at its upper end between which a gap is defined. The riser seal element is comprised of an elastic material and has an outer portion which is held in the seal element receiving slot to thereby position the seal element in an upward, generally conical orientation. An inner portion of the seal element extends into the gap to form a seal therein for preventing the entry of extraneous material through the gap. The inner portion of the seal element is flexible between an upwardly slanted position and a downwardly flexed position.

Abstract: A double action slurry pump is provided having a shelf-flushing piston assembly mounted in a mating cylinder. The piston assembly includes a first piston having a peripheral sealing means and a reciprocating piston rod for driving the first piston. Second and third power pistons mounted adjacent opposite sides of the first piston include sealing discs and form respective first and second chambers with the first piston and the adjacent cylinder wall. The second and third power pistons serve to pump the slurry on the sides opposite the flushing fluid chambers. Each of the pumping pistons includes hollow carriers that cooperate with shoulders fixed to the piston rod to provide limited lost motion movement. The resulting lost motion serves to vary the size of the first and second chambers. During the stroke of the piston assembly in one direction, feed lines in the piston rod provide flushing fluid to the expanding second chamber.

Abstract: A pump for pumping fluids which contain a high degree of suspended solid particles comprises a piston provided with a cylindrical sleeve of a hard ceramic material having a hardness of greater than nine on the Mho scale, preferably an aluminum oxide ceramic or a zirconium nitrate ceramic, and a cylinder provided with a cylindrical sleeve of like ceramic material.

Abstract: A slurry pump is provided having a self-flushing piston assembly mounted in a mating cylinder. The piston assembly includes a first piston having a peripheral sealing member and a reciprocating piston rod for driving the first piston for pumping action. A second piston mounted adjacent to the first piston includes a sealing member and forms an enclosed chamber with the first piston. A lost motion coupler connects the pistons together and varies the size of the chamber. On the return stroke of the piston assembly, flushing liquid on the non-slurry side is sucked into the chamber as the chamber expands. On the power stroke, the flushing liquid is forced past the second sealing member to remove slurry particles and prevent wear of the cylinder. The disc on the first piston has sufficient flexibility to allow filling of the chamber and an accumulator is provided to control the back pressure after the chamber has been filled on the return stroke.

Abstract: In a mud pump liner and piston cleaner a split ring-type tubular reservoir, supplied with fluid under pressure, substantially surrounds the end portion of a liner projecting out of a mud pump cylinder. A plurality of small diameter tubing sections, each communicating at one end with the reservoir, direct streams of fluid, from their other ends, in a washing action toward the inner periphery of the liner.

Abstract: A sealing arrangement for a rectilinear reciprocable piston within a cryoic refrigerator comprising a buffer defined by dual O-rings disposed around the circumference of the piston and containing pressurized gas of the same type as the refrigeration gas. The buffer limits or prevents both the entrance of contaminants and also the escape of the refrigeration gas.

Abstract: A rotary actuator (11) having a vane (24) which is pivoted in a chamber (13) by fluid pressure to turn an actuator shaft (18) includes internal sump cavities (41A, 41B) that collect abrasive particles from the fluid and which hold such contaminants away from the path of movement of the vane (24). Shields (49A, 49B) protect the sumps (41A, 41B) from fluid turbulence. A magnetic element (47A, 47B) at each sump (41A, 41B) attracts and holds ferromagnetic particles and may be removed for cleaning without a general disassembly of the actuator (11) and with only a minimal draining of fluid. Actuator (11) durability is increased by reducing wear of moving components and maintenance is facilitated by simplifying cleaning. Among other uses, the invention may be employed in actuators (11) which swing a backhoe (34) relative to a supporting vehicle (32).

Abstract: A fluid pressure operated cylinder having a removable cylinder head insert or "nose" that carries a replaceable piston rod pressure sealing means and a rod guide bearing. The bearing and seal are mounted around the piston rod bore, adjacent an axially inner end of the nose, and are protected from dirt by a wiping passage that extends to an axially outer end of the nose. The nose is removable from the head for replacement, without disassembly of the head from the cylinder body.

Abstract: In a pump having a cylinder liner, there is a piston therein, a seal around the piston and rear wearband around the piston body to align the piston within the liner. An elastomeric seal ring is in sealing and sliding contact with the liner. A gap filler, with minimal axial creep and controlled radial creep, abuts the rear surface of the seal and maintains continuous contact with the liner thereby continuously closing the extrusion gap between the gap filler and the liner as the liner wears. The wearband has a plurality of angled grooves longitudinally traversing it. Abrasive particles are directed within and through the grooves in the wearband while a source of liquid is communicated into the piston body, through water channels in the gap filler and through the flowpaths in the wearband to create a vortex action which washes the liner wall. The wearband insures no metal to metal contact between the piston and liner and provides a constant piston gap between the metal piston and liner.

Abstract: A single acting pump has a piston with an elastomeric and synthetic fabric seal ring and is provided with means to supply fluid to the piston and passages in the piston for circulating fluid to cool and clean the piston on both the pressure stroke and the back stroke. The passages in the piston include a check valve preventing flow of fluid to the back side of the piston during the pressure stroke and permitting fluid flow to the seal ring during the back stroke.

Abstract: A hydraulic pump is provided which includes a plurality of housings, each of which has an upright cylindrical cavity formed therein, and a plurality of plungers, one for each cavity. The housings are removably mounted on a common support and the plungers are removably mounted on a common actuating member which is adapted to move in a linear path relative to the support and simultaneously move the plungers relative to the housing cavities.

Abstract: A piston and piston rod construction for use in a double-acting reciprocating pump, and a method of flushing a piston-type pump. The piston has spaced apart rubbers mounted on a body intermediate its length. The rubbers have confronting lips. Each rubber alternately is the working rubber and the idle rubber as the pump operates. Fluid under a pressure greater than the pump discharge pressure is introduced to the space between rubbers, where it is effective to flush particles from the surface of the liner in front of the working rubber.