Abstract: A fluid flow stabilizing method and a pump having a stabilized fluid flow passage where a process fluid contains suspended solid particles and is subject to pressure oscillations. The method comprises positioning an expandable membrane along the lower transverse surface, inflating the membrane with a compressible fluid, and alternatingly expanding and contracting the membrane to dampen the pressure oscillations and inhibit settling of the solid particles at the lower transverse surface. The pump comprises a stabilizer comprising a compressible fluid in an expandable membrane elongated along the lower transverse surface of a manifold in fluid communication with the fluid end. Another method comprises reciprocating a plunger in the pump to pass a slurry through the manifold, and alternatingly expanding and contracting a stabilizer in the manifold.

Abstract: An attenuating apparatus for use with a positive displacement compressor. The device includes a bore formed in a housing of the compressor, the bore being positioned at an angle to a discharge chamber of the compressor and in fluid communication with the compressor discharge chamber. A plug is positioned within the bore, the plug movable within the bore to a preselected position. The plug has a first end in contact with a gas from the compressor discharge chamber and a second, opposite end being accessible from an exterior of the housing. A seal is positioned between the plug and the bore to seal an interface between the plug and the bore to prevent leakage of a gas from the compressor discharge chamber along the interface. The plug is lockable within the bore at the preselected position.

Abstract: Gas of a predetermined pressure, which is equal to or higher than the atmospheric pressure, is filled in a damper chamber of a damper member that includes first and second-side diaphragms. A first-side limiting portion of a first-side cover member and a second-side limiting portion of a second-side cover member are engageable with a first-side concave portion of the first-side diaphragm and a second-side concave portion of the second-side diaphragm, respectively, to limit bulging of the damper member when a pressure of a fluid chamber is equal to or less than the predetermined pressure.

Abstract: A liquid pump is provided in which pulsations can be properly absorbed even if the pump is driven at a high frequency. A pulsation absorbing unit for absorbing pulsation includes a pulsation absorbing housing disposed on a pump housing member, a second diaphragm attached to the pulsation absorbing housing member and defining a pulsation absorbing chamber communicating with a liquid outlet passage of a liquid pump unit, and a disc spring for biasing the second diaphragm toward the pulsation absorbing chamber.

Abstract: A fluid flow stabilizing method and a pump having a stabilized fluid flow passage where a process fluid contains suspended solid particles and is subject to pressure oscillations. The method comprises positioning an expandable membrane along the lower transverse surface, inflating the membrane with a compressible fluid, and alternatingly expanding and contracting the membrane to dampen the pressure oscillations and inhibit settling of the solid particles at the lower transverse surface. The pump comprises a stabilizer comprising a compressible fluid in an expandable membrane elongated along the lower transverse surface of a manifold in fluid communication with the fluid end. Another method comprises reciprocating a plunger in the pump to pass a slurry through the manifold, and alternatingly expanding and contracting a stabilizer in the manifold.

Abstract: A frequency suppressor for a hydraulic system is shown and described. The frequency suppressor comprises a housing that contains a substantially fixed mass of a compressible substance. The volume of the compressible substance is varied to dampen frequency disturbances in the hydraulic system.

Abstract: Various embodiments of a fluid displacement system are disclosed. The system may include a reservoir containing a fluid in a liquid state and a first chamber hydraulically connected to the reservoir to receive the fluid from the reservoir. The first chamber may be configured to receive solar energy and configured to convert the received solar energy to vaporize the fluid. The system may also include a second chamber hydraulically connected to the first chamber to receive the vaporized fluid from the first chamber. The second chamber may be configured to condense the vaporized fluid, causing depressurization in the second chamber. The system may also include a hydraulic connection between the second chamber and a source of fluid to be displaced. The system may be configured such that the depressurization of the second chamber may cause fluid in the source of fluid to be displaced through the hydraulic connection.

Abstract: A frequency suppressor for a hydraulic system is shown and described. The frequency suppressor comprises a housing that contains a substantially fixed mass of a compressible substance. The volume of the compressible substance is varied to dampen frequency disturbances in the hydraulic system.

Abstract: A frequency suppressor for a hydraulic system is shown and described. The frequency suppressor comprises a housing that contains a substantially fixed mass of a compressible substance. The volume of the compressible substance is varied to dampen frequency disturbances in the hydraulic system.

Abstract: A housing of a pump apparatus includes an undivided cavity, an inlet valve through which liquid can enter the cavity, and an outlet valve through which the liquid can exit the cavity. A primary piston is configured to reciprocate in the cavity to draw the liquid into the cavity through the inlet valve during an intake stroke of the piston and discharge the liquid out of the cavity through the outlet valve during a delivery stroke. A reservoir structure is configured to add, to the total volume of the cavity, an extra volume that is a smooth positive function of liquid pressure in the cavity.

Abstract: A compressor has a suction muffler structure capable of reducing vibration and noise accompanying liquid compression. The suction muffler structure involves a muffler chamber defined between a suction chamber of the compressor and an external coolant circuit. A suction passage connects the muffler chamber to the suction chamber. A liquid-storage space is formed in the region of the muffler chamber lower than the inlet of the suction passage to the muffler chamber.

Abstract: A hydraulic pump [14] for an electro-hydraulic power steering system is positioned in a fluid reservoir [16] in a pump housing [12]. The pump [14] has an upstream end [40] that receives fluid from a fluid source and a downstream end [42] that is in communication with fluid expelled from the pump [14]. The pump housing [12] has an integral dampening chamber [36] formed therein adjacent the downstream portion [42] of the pump [14]. The dampening chamber [36] helps minimize pressure pulsations before the fluid is passed through an outlet opening [18] in the housing [12] to a steering gear.

Abstract: A hydraulic pump [14] for an electro-hydraulic power steering system is positioned in a fluid reservoir [16] in a pump housing [12]. The pump [14] has an upstream end [40] that receives fluid from a fluid source and a downstream end [42] that is in communication with fluid expelled from the pump [14]. The pump housing [12] has an integral dampening chamber [36] formed therein adjacent the downstream portion [42] of the pump [14]. The dampening chamber [36] helps minimize pressure pulsations before the fluid is passed through an outlet opening [18] in the housing [12] to a steering gear.

Abstract: An airless paint sprayer has a pressure dampener in the paint supply line to the pump for providing consistent atomization at the spray gun orifice. During peak pressure times within the system and when an inlet check valve is open, paint within the pressure dampener is added to the paint in the supply line to overcome the tendency for the paint to cavitate and delivery an uneven spray pattern.

Abstract: A ripple reducing device of the present invention for reducing ripple of oil flowing through a hydraulic line includes a closed line that diverges from the hydraulic line and is closed at a terminal end thereof, and at least one restrictor that divided the interior of the closed line into a plurality of sections, between a branch point at which the closed line diverges from the hydraulic line, and the terminal end of the closed line.

Abstract: A diaphragm type damper has a combined member, which is formed by welding a marginal portion of a diaphragm to a half body having a concave portion formed therein, and is fixed to a pressure chamber portion to which high pressure fluid is introduced. A wall thickness of a welding portion of the half body is not relevant to welding, and the heat capacity of the welding portion is small. Since the half body is allowed to have a large wall thickness, leakage from the welding portion and damage to that portion can be prevented. In addition, the diaphragm type damper of this present invention can be easily assembled, since it requires only fixing the combined member to the pressure chamber portion.

Abstract: A marine tank (such as a toilet system holding tank, or bilge tank) pump out system includes a positive displacement pump connectable at the inlet to a marine tank to be pumped out and connectable at the outlet to a discharge tank or area. A pulsation dampener is connected between the pump outlet and the discharge tank or area, preferably directly to the pump so that a pump check valve is within the pulsation dampener. The pulsation dampener has an open chamber extending upwardly from the pump outlet into which pumped fluent material may flow, and has no moving parts (such as a diaphragm). Typically two different outlets from the dampener are provided for versatility and connecting up to discharge tanks or areas, one of the outlets filled with a plug. The dampener may comprise either a substantially L-shaped or C-shaped (when viewed from the dampener inlet) casing, which nests with the pump motor.

Abstract: A fuel injection pump for internal combustion engines, which includes at least one pump piston driven by a cam drive mechanism to carry out a feed stroke and an intake stroke. The pump includes a fuel filled storage chamber that is under storage pressure and is for aspirating fuel in the intake stroke and for feeding excess fuel at the end of the feed stroke to a tank. A fluid filled drive mechanism chamber under lubrication pressure, contains the cam drive mechanism and is divided from the intake chamber by a movable wall. A vacuum chamber is disposed in the fluid filled drive mechanism chamber in order to damp pressure oscillations in the drive mechanism chamber, the vacuum chamber is at least partially defined by a membrane that is acted upon by the lubrication pressure. The rigidity of the membrane is designed so that its effectiveness comes into play only when there is a pressure load that is slightly greater than the stationary lubrication pressure in the drive mechanism chamber (22).

Abstract: An eccentric-motion motor for driving a utilization mechanism includes a stator defining a closed surface pathway, an armature composed of a permanent magnet rollably disposed on the closed surface pathway, a series of electromagnetic elements disposed in the stator along the closed surface pathway, circuitry for successively energizing the electromagnetic elements to cause them to attract and/or repel the armature so that it rolls along the closed surface pathway, and a coupler mechanism for coupling the armature to the utilization mechanism so that as the armature is caused to roll, the utilization mechanism is powered by the operation of the motor.

Abstract: An airless paint sprayer includes an inlet check valve assembly having a dual spring configuration which allows for increased travel distance of the inlet check valve thereby increasing the fluid flow through the valve without diminishing response time of the valve or the priming operations of the system. A dampener also contributes to lessening the cavitation and loss of pressure in the paint sprayer and comprises a generally T-shaped fitting in which one leg of the T-shaped fitting is capped and includes a trapped volume of air to dampen acceleration/deceleration forces and acceleration spikes being transmitted from the pump to the fluid being pumped through the fitting.

Abstract: A fuel delivery system in an engine is provided with a fuel flow stabilizing device for instantaneously providing a precise amount of fuel to the engine according to a particular fuel demand. The fuel flow stabilizing device has an accumulator device which stores a reserve amount of fuel under pressure and supplies or accepts excess fuel in response to a change in fuel pressure in the fuel delivery system. The accumulator device allows a simpler fuel pump motor and control system to be used as fuel pump response time requirements are reduced.

Abstract: A water supply system includes a motor operated pump (12) which provides water upon demand to a remote location via a discharge pipe (13). When the demand 5 ceases, the pump (12) continues to operate to provide water to an annular chamber (21) which is under air pressure. The annular chamber (21) is formed by a storage pipe (20) generally concentrically positioned around the discharge pipe (13). A pressure switch (17) senses the water pressure in the discharge pipe (13) and stops the pump when a first predetermined pressure level is reached. Then upon the next water demand, water is provided from that in the storage pipe (20) until a second predetermined pressure level is sensed by the switch (17) at which time the pump (12) is activated to provide water through the discharge pipe (13). An air volume control unit (45) maintains the proper air pressure in the annular chamber (21).

Abstract: A precompression pump is disclosed with a sliding inlet valve seal. In a first embodiment, the valve seal has sealing and retention surfaces which interact with sealing and retention surfaces on a bead on the inner wall of the pump chamber, to seal the pump inlet and retain the inlet seal respectively. In a second embodiment, the seal has friction tabs which engage the outer wall of the pump chamber. On the upstroke of the piston, these tabs engage a bead on the inner wall of the pump chamber, causing the tabs to rotate about a hinge, increasing the outer diameter of the seal. The result is improved frictional engagement of the seal with the inner wall, resulting in improved retention of the seal.

Abstract: An electric-motor fuel pump that includes an inlet end cap, an outlet end cap and a case coaxially joining the end caps to form a closed pump housing. An electric motor is disposed with the housing, and includes an armature journalled for rotation between the end caps, a stator surrounding the armature and means for applying electrical power to the motor. The armature is coupled to a gerotor mechanism for pumping fuel from the inlet to the outlet through the housing. The gerotor pumping mechanism comprises an annular wall on the inlet end cap forming an open pocket axially opposed to the armature. Inner and outer gear rotors are disposed within the pocket, and have radially opposed intermeshing teeth that define circumferentially disposed expanding and ensmalling pumping chambers. The inner gear rotor is coupled to the motor armature. Inlet and outlet gerotor ports in the inlet end cap axially open between the rotors into the expanding and ensmalling chambers respectively.

Abstract: A hydropneumatic arrangement is provided for actuating a pump upon pressure decrease and for deactivating the pump upon flow decrease. The hydropneumatic arrangement includes a bearing cylinder; a flow sensor piston movably disposed within the bearing cylinder; a driving piston connected to the flow piston by a common shaft, the flow sensor piston being moved according to a variation in consumption demand by an interaction of a force of flow exerted against the flow sensor piston and a force of pressure exerted on the driving piston. A pressure switch is provided and is electrically connected to an electric motor that drives the pump.

Abstract: An electric-motor fuel pump that includes an inlet end cap, an outlet end cap and a case coaxially joining the end caps to form a closed pump housing. An electric motor is disposed with the housing, and includes an armature journalled for rotation between the end caps, a stator surrounding the armature and means for applying electrical power to the motor. The armature is coupled to a gerotor mechanism for pumping fuel from the inlet to the outlet through the housing. The gerotor pumping mechanism comprises an annular wall on the inlet end cap forming an open pocket axially opposed to the armature. Inner and outer gear rotors are disposed within the pocket, and have radially opposed intermeshing teeth that define circumferentially disposed expanding and ensmalling pumping chambers. The inner gear rotor is coupled to the motor armature. Inlet and outlet gerotor ports in the inlet end cap axially open between the rotors into the expanding and ensmalling chambers respectively.

Abstract: To reduce transmission of pump vibration and any out-of-balance characteristics to a pump enclosure by mounting both ends of a motor armature in a manner to absorb vibration. One end of the armature drive shaft is mounted in a flexible elongate element which accommodates to eccentric motion due to unbalance or vibration due to pump load or starting and stopping. The other end of the drive shaft is designed to move to accommodate such motion. A pump chamber can be provided around the flexible element to form a dead air dome to modulate pump pressure and collect vapor. Baffles prevent turbulence in the chamber.

Abstract: Liquid chromatograph apparatus includes a solvent proportioning valve arrangement which comprises a block (21) having four inlet passages and a number of outlet passages communicating with a common outlet passage (28) and an outlet port (29) to which a tube may be attached for connection to the inlet of a pump. Each inlet passage (30) is connected to a solvent source by a tube (43) which passes into a chamber (32) mounted on the block (21). The chamber (32) is air-tight and contains a quantity of gas or air to absorb shock waves in the liquid when the diaphragm (26) blocks the inlet (30) and outlet (27) passages.

Abstract: The invention relates to an oil well comprising a production tubular with a pump barrel attached to its lower end, a reciprocable oil pump having a plunger located within the pump barrel, a sucker rod string extending downwardly from ground level to the plunger for reciprocating the plunger, means for cyclically raising the sucker rod string, a chamber located and arranged so as to be open to oil pressure immediately above the plunger, wherein the chamber is located externally of the production tubular, the chamber is in communication with the interior of the production tubular and the chamber contains a resilient bladder member arranged to occupy normally substantially the whole volume of the chamber to be connected to a source of pressurized gas through a non-return valve, to contain and maintain gas at the static oil pressure and to occupy a reduced volume of the chamber when the oil pressure immediately above the plunger increases due to pressure surges arising from elastic deformation of a column of oil.

Abstract: A system for the supply of gas to a variable flowrate consumption use point comprising monitoring specified system parameters, making specified determinations, and adjustable the liquid pump speed accordingly. Preferably the monitoring is computerized. The invention results in a less costly and more efficient gas supply system.

Abstract: A pressure pulsation dampener particularly adapted for use in connection with positive displacement reciprocating plunger pumps comprising a pressure vessel adapted to be connected to the pump discharge flow line and having a liquid volume capacity sufficient to reduce the flow velocity of the liquid entering the vessel by approximately 85%. The liquid volume capacity of the tank is preferably at least 5% of the discharge liquid volume flow rate of the pump wherein the units of volume are the same and the unit of time of liquid flow rate is the minute. The tank includes a gas volume portion formed by a bulkhead in the tank, an inflatable flexible bladder disposed in the flow path of the fluid flowing through the pulsation dampener or an elongated tube in which a gas-liquid interface is maintained.

Abstract: An apparatus is provided for injecting fluid into a patient over an extended period of time, such as in intravenous feeding of a patient. The apparatus enables close control of injection quantity and rate while assuring an even flow into the patient. The apparatus utilizes relatively simple disposable parts. The apparatus includes an air-operated peristaltic pump which pumps a controlled amount of fluid in each cycle of operation, and a pressure moderator which receives the liquid pulses and supplies an even flow to the patient. The moderator includes a closed chamber, and a resilient tube connected to the pump and having slits that permit the escape of pumped liquid into the chamber. The peristaltic pump includes a flexible but nonresilient tube connected to the container, the nonelasticity assuring that the tube does not expand beyond a predetermined dimension when a vacuum is applied to it.

Abstract: Conventional installations for pumping of liquid LNG (liquefied natural gas) from a sealed tank of a marine vessel to a shore installation commonly include a pump immersed in the liquid, a riser pipe from the pump to a level above the liquid, a stop valve on the riser pipe outside the tank, and a connection to the header leading to the shore installation. With the stop valve closed, operation of the pump can cause slamming of the liquid, accelerating up the riser pipe, against the stop valve, to the extent that the valve or piping may be damaged or destroyed. The invention provides a method of operation, and apparatus to permit it to be carried out, whereby a pocket of non-liquefiable gas is formed in the riser pipe above the liquid level so that, upon operation of the pump with the stop valve closed, although LNG vapor in the riser pipe may become compressed to liquid, the pocket of gas remains to act as a compressible buffer between the rising liquid and the stop valve.

Abstract: A stabilizer is disclosed, as for use at the intake to a fluid pump, comprising a tank for containing a reservoir of liquid for supplying the pump. Extending from and above the tank, a tube provides a dome to confine a volume of gas to dampen pulsations created by the pump. The gaseous phase (vapor) in the dome is maintained in the tank by a heater mounted on the dome in such a manner as to provide heat somewhat related to the need for increasing the volume of the gaseous phase. Increased heat transfer within the tank vaporizes liquid to increase the pressure of the gaseous phase resulting in an increase in volume.

Abstract: An apparatus for the conversion of complex surface motion of the sea or other fluid body into useful energy, comprising a pair of floating bodies, each of which constitutes a wave motion pump; the pair of floating bodies being linked by a lever whose motion serves to initiate and multiply the pumping energy of each. Each floating body contains two piston operated water cylinders with water intake check valves at their bases and a third cylinder serving as a pressure chamber. Each floating body contains its own fulcrum such that it rocks about one end of the lever. The downward pivotal motion of the lever on the piston shaft of the piston in one of said water cylinders forces water out of the cylinder. Simultaneously, the upward motion of the lever on the other side of the fulcrum pulse the piston shaft of the other piston upward, causing water to be taken into the other cylinder through the intake check valve at its base.

Abstract: A pressurized hydraulic sump system comprises a sump manifold to which a variable volume reservoir is connected, and is characterized by a piston which is displaceable by hydraulic means to vary the volume of the reservoir in accordance with the position of a valve which is responsive to sump pressure so that the piston is displaced in one or other direction according to whether the sump pressure is greater or less than a predetermined value.