Abstract: A dispenser which includes an elastic reservoir for sustaining pressure on material to be dispensed from the reservoir includes a rotatable actuator for actuating a piston for charging the reservoir. The charging piston is integral with the actuator, and the chamber or cylinder for the piston, as well as the reservoir support are integral with the container, thereby providing for a simple construction.

Abstract: A hermetically sealed scotch yoke compressor assembly is disclosed wherein a crankcase includes annular channels formed on the top and bottom surfaces thereof defining muffling chambers. Gas refrigerant compressed within radially disposed cylinders into cylinder head covers is channeled into the upper annular muffler chamber and them through passages extending through the crankcase into the lower muffling chamber. An annular cover plate for covering the bottom annular channel is attached to the crankcase at its radially inner extreme and is biased against the crankcase at its radially outer extreme. Spacers between the cover plate and the crankcase provide an annular discharge opening directing discharge gas onto the motor windings.

Abstract: An inner cylinder and a substantially larger outer cylinder are joined as two verticle concentric cylinders. Verticle partitions between the cylinders divide the space between the cylinders into an inlet chamber and an outlet chamber which is substantially larger in volume than the inner chamber. The inner cylinder has a central pumping section positioned between upper and lower valve sections. In the valve section ports extend through the inner cylinder wall to the inlet and outlet chambers. Spring loaded valves close the ports. Tension springs extend across the inlet chamber and compression springs extend across the inner cylinder to close the inlet valves. Tension springs extend across the inner cylinder the close the outlet valves. The elastomeric valve flaps have rigid curved backing members. A piston rod extends through one end cover to move a piston in the central section. An inlet is connected to the inlet chamber and an outlet is connected to the outlet chamber.

Abstract: One or more throttles are accommodated in a compression line and/or in a suction line to damp surges in reciprocating compressors. The size of the open cross-section of the throttle can be varied. The size is established to prevent surges from exceeding a prescribed limit.

Abstract: Each piston is provided with a suction plenum and the suction plenums are connected through restricted openings. This causes the suction inlets to be connected to a plurality of cylinders resulting in a continuous flow of gaseous refrigerant in each of the suction tubes.

Abstract: A method of compressing a multi-chambered sleeve which is normally wrapped about a patient's arm, comprising pressurizing an accumulator from within the accumulator, opening a manifold arrangement in said accumulator in a timed manner to direct pressurized air to proper chambers in a multi-chamber sleeve.

Abstract: A two-cylinder type rotary compressor has two compression elements each provided with a cylinder. First and second intake conduits are respectively formed in the cylinders so as to be in parallel to an intermediate partition plate disposed between the cylinders. Each one end of first and second intake tubes is connected to each of the intake conduits and each other end of the intake tubes is connected to a common intake pipe which is provided outside a hermetic casing.

Abstract: A suction sound damper for a slide piston refrigerant compressor that includes a suction nipple that is pushable into a groove of a cylinder cover of the compressor when the nipple is in a predetermined position, and is seatable in sockets formed in two shells of a damper housing. The shells are sealed together after the nipple is seated in the sockets. The suction nipple is of a material having a higher thermal resistance than the shell material. The damper includes intermediate walls that together with the shells form four somewhat triangular chambers with a throttle opening from the first chamber to the second chamber, an elongated throttle passage from the second chamber to third chamber and a throttle opening from the third chamber to the fourth chamber. The suction nipple opens to the first chamber and each shell includes a part of an inlet that opens to the fourth chamber.

Abstract: A vane type pump has an elongated pump housing through which the drive shaft of the pump passes. The usual components of the pump comprising a rotor which carries vanes within a cam ring is disposed between an inner end wall of the housing and a pressure plate wherein the pressure plate has pressure recesses or pockets. Damping chambers are provided in the elongated housing generally parallel to the drive shaft and substantially co-extensive with the housing bore that carries the drive shaft. Thus, very large volume damping chambers are provided for smoothing out pump pulsations in the course of operation.

Abstract: A pumping system includes a pump having a plurality of cylinders, a suction manifold and a discharge manifold. Each cylinder includes a piston connected to a pump shaft. The system also includes apparatus for rotating the pump shaft so as to move the pistons. A fluid enters the pump by way of the suction manifold, is compressed in the pump by the pistons and the compressed fluid leaves the pump by way of the discharge manifold. Equipment connected to the discharge manifold affects the discharging of the compressed fluid in accordance with the number of cylinders and the rotational frquency of the pump shaft.

Abstract: A high pressure fluid handling pump of the type having a drive shaft for connection to a drive motor where the drive shaft extends longitudinally through a pulsation dampener affixed to the pump's housing. The pulsation dampener comprises a cup-shaped housing having a pump shaft receiving bore extending through an end wall thereof and which, when secured to the motor housing, defines a hollow chamber in fluid communication with the pump's outlet. Disposed within the hollow chamber of the pulsation dampener housing and concentric with the motor's shaft is a rigid baffle member. Surrounding that is a tubular diaphragm formed from an elastomeric material of a predetermined durometer hardness, the tubular diaphragm effectively dividing the hollow chamber into two compartments isolated from one another.

Abstract: A diaphragm pump has at least one double-acting piston moving in a cylinder closed at its ends by diaphragms and filled with oil. The diaphragms are capped by cylinder heads defining the chambers in which warping of the diaphragms produces the suction and discharge of liquid to be pumped through suction and discharge tubes each having a one-way valve therein. The diaphragms are centrally connected to the piston ends by screws whose screw heads have the form of a large diameter, concave metal cup. The screw head concavity faces the cylinder heads and has an internal surface provided with, for example, annular reliefs, ensuring a large contact surface between the screw heads and the pumped cooling liquid.

Abstract: An accumulator-reservoir device in a liquid cooling system utilizes a piston and metallic bellows to separate system pressures that are high and low in relation to one another. A piston position indicator is used sensing less than the full piston stroke in a manner to yield an accurate quantity measurement without undue elongation of parts.

Abstract: A ripple regulating system is disposed in a liquid supply system for minimizing pressure ripples generated by a pump employed in the liquid supply system. The ripple regulating system includes a pressure chamber of which one wall comprises a bellowphragm. A spring is secured to the bellowphragm to apply a predetermined pressure to the pressure chamber. A detection system is associated with the pressure chamber for detecting a balance pressure variation. When the balance pressure becomes higher than the preselected level, an adjusting system is operated to increase the depression pressure generated by the spring, thereby maintaining the constant flow rate supply.

Abstract: A tracheal tube assembly includes a dual balloon system upstream from the tracheal cuff and located externally to the patient. A pre-determined amount of air may be injected through a one-way valve into the innermost balloon which is of relatively low compliance. Expansion of the inner balloon passively expands the high compliance outer balloon. When the inner balloon is preloaded the system is ready for use. Opening of a control valve selectively interconnects the inner balloon with the surrounding relatively high compliance outer balloon via a high resistance inlet and with the tracheal cuff via a low resistance inlet so that the tracheal cuff is preferentially inflated. Equalization of pressure in the system rapidly occurs and this pressure is determined and maintained at a constant level by the characteristics of the high compliance outer balloon. The control switch can be positioned to allow the tube to function in a non-pressure regulated mode as in the conventional tube.

Abstract: A surge suppressing check valve, in its closed condition, closes a fluid passage and separates it into inlet and outlet portions. A cylinder communicates with the outlet portion. A first piston closes the cylinder adjacent to the outlet portion and is axially movable against the urging of a compression spring to enlarge the volume of the outlet portion of the fluid passage for suppressing pressure surges therein. A second piston is provided for pre-loading the bias spring, the pre-loading being selectively variable via a threaded stem and nut connected to the second piston. The first and second pistons are coupled together so that the entire assembly can be removed from the housing. Means are provided for removing fluid from the housing.

Abstract: The invention relates to an arrangement in plant equipment for directly supplying to a building element a binder comprising, for example, mortar of pumpable consistency and containing water. The plant equipment includes a vessel for ready-mixed binder, a motor-driven pump and a pump conduit (3) for supplying binder under pressure to a nozzle (4). In order to prevent liquid from being expelled from the binder when the pump is stopped, so as to leave a dry plug in the nozzle, means (18) are provided for maintaining the pressure in and adjacent the nozzle (4) at a level which coincides at least substantially to atmospheric pressure.

Abstract: A pulse dampener for inclusion into a liquid chromatography system comprising a body defining a cylindrical cavity which is enclosed by a closure member. A chemically inert diaphram extends across the cavity and further encloses a unitized plug. The unitized plug is provided with at least two portions, each having different compressibility characteristics. The closure member is provided with inlet and outlet ports, and a central thinned section on which is mounted a strain gauge. The strain gauge is used to measure liquid pressure in the dampener.

Abstract: A new and improved surge tank for the refrigeration circuit of an automobile air-conditioning system is fabricated from tube stock and comprises a unitary main cylindrical body having a sidewall and end walls. The end walls are formed by friction spinning.

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 high pressure metering pump has a duty cycle consisting of an aspiration portion where liquid is aspirated into a pumping chamber, a compression portion where the aspirated liquid is compressed to feed pressure, a feed portion where a part of the compressed liquid is expelled out of the pumping chamber, and a decompression portion where the liquid remaining in the pumping chamber is expanded to aspiration pressure. A measurement and control apparatus for the pump comprises a controller for adjusting and keeping constant the mean flow rate of the pumped liquid on the aspiration side or on the high pressure side of the pump. The apparatus further comprises a detector for detecting the transition point between the compression and feed portions and/or between the decompression and aspiration portions. The detector derives a control signal for the pump speed and for the optimal opening instant of an externally actuated input valve of the pump from the phase relationships of said transitions.

Abstract: A high vacuum apparatus which comprises:a vacuum vessel,a mechanical booster connected to the vacuum vessel,a rotary pump connected to the mechanical booster,a gas inlet provided with a connecting pipe which connects the mechanical booster with the rotary pump, to introduce a gas into the suction side of the rotary pump so as to maintain the degree of vacuum in the suction side of the rotary pump lower than the maximum degree of vacuum attainable of the rotary pump, so that substantially no contamination of the atmosphere in the vacuum vessel by the reverse diffusing oil vapor occurs.

Abstract: An expansion hose having a central internal throttle element dividing the interior of the hose into two chambers, and an internal hose extending from the expansion hose inlet through one of the chambers and the throttle element into the second chamber. The portion of the inner hose within the first chamber has radial throttle passages, and the portion within the second chamber is imperforate.

Abstract: A high pressure meter pump system with improved accuracy is provided by subdividing a large meter pump capacity into metered subvolume charges which are incrementally delivered to a high pressure slave pump.This enables the pump sytem to achieve improved accuracy independent of flow rate and therefore increasing the range of flow rates available with acceptable accuracy. Additionally, the pump system self-primes independently of flow rate and therefore does not require degassing of the solvent being pumped.

Abstract: A diaphragm pump for fluids has a housing, a fluid displacement part including a displacement chamber and a pump diaphragm, and a flow control including a damping chamber arranged to absorb pressure impacts a fluid in aspiration region and having an adjustable fluid admission volume so as to change a fluid supply to the pump diaphragm.

Abstract: A rotary pump for pumping liquid which includes a rotor combination in the form of a vane pump or gear and rotor with pumping chambers disposed circumferentially around the rotor. The chambers progressively increase in the inlet area and ensmall in the outlet area. Pulse absorbtion means are interposed in the fuel passage means to absorb pulses and smooth out the pressurized outlet liquid, thus reducing the pump noise under all conditions of operations.

Abstract: A pressure pulsation dampener for use in connection with positive displacement reciprocating piston pumps comprising a spherical pressure vessel having opposed inlet and outlet ports arranged along a diametral line of the vessel sphere and having a generally cylindrical flexible tubular member forming part of a replaceable cartridge disposed within the interior chamber of the spherical pressure vessel. The liquid volume capacity of the spherical pressure vessel is sufficient to reduce to the flow velocity of the liquid entering the vessel by approximately 85%. A flexible elastomeric tubular member is provided with encapsulated longitudinally extending reinforcing cords which are of a generally curved shaped and of a length longer than the length of the flexible member. Upon inflation of the flexible member the cords ultimately come under tension to limit the expansion or distention of the flexible member and to absorb the stress imposed on the flexible member under the maximum distended condition.

Abstract: A motor driven fuel pump assembly has an integral accumulator. The fuel pump is a two-stage pump with the secondary stage being a positive displacement unit such as a roller vane pump. The fluid output of the secondary pump is connected with a space surrounding the drive motor for the pump. The space is defined partially by a resilient membrane which is operable to expand with pressure increases and thereby absorb and damp the pressure and flow fluctuations from the secondary stage pump. The membrane member effectively provides a moving wall of an accumulator which serves to provide the damping effect on the flow and pressure variations within the system.

Abstract: A pump device comprises a housing having an air intake port and an air discharge port, and with its inner peripheral surface being formed in a cylindrical shape; a rotor mounted in said housing and rotating eccentrically in said housing; a plurality of vanes mounted in said rotor and getting into slide-contact with the inner peripheral surface of said housing with rotation of said rotor so as to send under pressure the gas from said air intake port to said air discharge port; a communicating port defined by said vane, the inner peripheral surface of said housing, and the outer peripheral surface of said rotor, and communicatively connected with said operating chamber; and a gas storing chamber for sending and receiving the gas between it and said operating chamber through said communicating port to reduce a pressure differential in said air discharge port and said operating chamber.

Abstract: A pulse damper for use in a liquid chromatographic solvent delivery system includes a cavity within a housing containing a compliant medium. The compliant medium being an elastomer. As a consequence, a solvent flow volume can be precisely formed and maintained.

Abstract: A control device associated with a pneumatically-driven demand pump comprising a valve system which shuts off the gas which drives the pneumatic pump in response to a pressure-sensitive diaphragm which detects variations in pressure in the fluid output from the pump. The pressure-sensitive diaphragm serves the dual function of suppressing surges of liquid flow from the pump and stopping the pump when the liquid pressure drops below a predetermined minimum by closing a valve to shut off the gas.

Abstract: In a liquid coolant circulating or like system an accumulator--reservoir device of the bootstrap type. The reservoir device has a sliding seal construction, in which a piston is subject to high and low pressure influences as these relate to discharge and intake sides of a liquid circulating pump. External leakage from the device is minimized by an arrangement avoiding the need to seal against high pressure loss direct to ambient. Overall length is reduced by the arrangement which places a high pressure chamber between low pressure chambers. A hollow piston construction permits packaging system components within the reservoir, introducing further opportunity for simplicity and compactness of design.

Abstract: The liquid flow valve of the present invention is a one-way shock-absorbing valve specifically designed to dampen noise and vibrations, and exhibiting improved durability and utility. The valve comprises a housing defining a passageway extending longitudinally therethrough and a shoulder extending into the passageway. It also includes a valve element housing a main body defining a central longitudinal conduit and also having an expanded seat. The element is slideably disposed in the passageway for movement between a valve-closed seated position on the shoulder and a valve-open unseated position. The valve element features a bellows connected to the main body to seal the conduit. The bellows elongated, that is, unfolds in response to liquid back pressure directed upstream and thus dampens shocks and knocking which otherwise would occur. The bellows comprises readily moveable durable components and may be disposed in the conduit and/or extend from an end of the valve element main body.

Abstract: An improved pump unit for sampling air that operates at a constant air flow rate in the range of 5-5000 cc/min.

Abstract: Flexible bellows are utilized between two systems, such as a pumping system and a process station, to partially absorb system vibrations and to compensate for misalignment between the systems. It is common practice to either clamp a rigid spacer between flanges of the two systems (FIG. 3B) to separate them from each other, or to maintain the bellows in unsupported relationship between these systems (FIG. 4B). In the former bellows arrangement, the rigid spacer transmits vibratory energy between the two systems and the bellows tends to function as an undamped or underdamped unit that resonates at its own frequency to create additional vibratory energy, transmitted to the systems. In the latter, unsupported bellows arrangement (FIG. 4B), the pressure differential prevalent between the fluid flowing through the bellows and ambient normally causes extension or retraction of the bellows and resulting misalignment problems.

Abstract: A rotary pump for pumping liquid which includes a rotor combination in the form of a vane pump or gear and rotor with pumping chambers disposed circumferentially around the rotor. The chambers progressively increase in the inlet area and ensmall in the outlet area. Pulse absorbtion means are interposed in the fuel passage means to absorb pulses and smooth out the pressurized outlet liquid, thus reducing the pump noise under all conditions of operations.

Abstract: The invention relates to a liquid pulsation dampener device for use in a piping network, including at least one hydro-pneumatic vibration dampener arranged at the delivery side of a positive-displacement pump. Such pumps are apt to impose normally undesirable periodic fluctuations or pulsations upon the liquid flow. The invention aims at providing a device suitable for manufacture at low cost and requiring a minimum of space while largely reducing pulsations of flow and of pressure in a piping network. In accordance with the invention, there is, at the delivery side of the positive-displacement pump and in addition to the hydro-pneumatic vibration dampener, a dynamically acting vibration dampener, and the hydro-pneumatic vibration dampener is arranged in a by-pass between the pump and the dynamically acting vibration dampener.

Abstract: In a flow rate control apparatus, pressure of a primary, or controlled, liquid is reduced without application of shear forces thereto. Each of first and second piston and cylinder assemblies has a first port on one side of the piston and a second port on the other side. A secondary fluid path between the two second ports contains a controlling fluid directed through a pressure reducing valve. The rate of flow of the primary fluid from the discharge cylinder is controlled by the rate of flow of the secondary fluid through the pressure reducing valve. A four way valve couples the controlled liquid at relatively high pressure through the first port in a first cylinder, and the controlled liquid is discharged at relatively low pressure from the first port in the second cylinder. The first and second pistons are rigidly connected to assure synchronized motion and accurate metering of the controlled liquid and to provide for driving of both pistons in response to input pressure of the controlled liquid.

Abstract: A gas-filled damping element for damping pressure pulsations, especially in an internal chamber of a pumping unit for pumping liquid fuel from a fuel storage receptacle to an internal combustion engine includes a rigid support member of a substantially plate-shaped or cup-shaped configuration, and a diaphragm having a marginal portion which is sealingly secured to a border zone or rim of the support member. The surface area of the diaphragm is greater than the projected area of the support member. The enclosed space between the rigid support member and the diaphragm is filled with a gaseous medium. A support element or portion extends into the enclosed space between the diaphragm and the support member, this support element having an abutment surface of an area smaller than the projected area of the support member and facing the diaphragm. The abutment surface serves for supporting the diaphragm when the damping element is exposed to extremely high pressures.

Abstract: A new mechanism for pulsation damping in a reciprocating diaphragm pump system is disclosed which is especially suitable for solvent delivery in modern high pressure liquid chromatography requiring a wide range of solvent flow rates and pressures. The disclosed damper has good overall performance over the full range of liquid chromatographic conditions, a dead volume independent of solvent pressure, and largely eliminates the necessity for continuously pumping the working oil of the diaphragm pump to a maximum operating pressure.

Abstract: The invention relates to a valve assembly for high-pressure pumps especially where pressures above 2,000 bars are concerned. The valve assembly for such high-pressure pumps consists of a distribution section, a suction valve, and a discharge valve. A surge vessel is provided in the discharge line in order to obtain a uniform operating pressure.

Abstract: A fuel injection system for an internal combustion engine employing a rotary valve for delivering fuel to fuel injectors in which fuel injection timing is precisely controlled to an optimum range by automatically controlling the rotary valve in response to the number of revolutions of the engine. The system includes a high pressure accumulator connected to a fuel pump and a low pressure accumulator connected to a tank through a variable restrictor valve. The rotary valve functions to selectively connect each injector to the high and low pressure accumulators as it rotates whereby metered amount of fuel can be fed into a plunger chamber of each injector when a piston chamber of the injector is connected to the low pressure accumulator and the fuel can be injected through nozzle orifices when the piston chamber is connected to the high pressure accumulator.

Abstract: A liquid supply system comprising a plunger pump and a ripple regulating system. The ripple regulating system includes a ripple regulator having a pressure chamber of which one wall is implemented with a bellowphragm for varying the volume of the pressure chamber. A solenoid mechanism is associated with the bellowphragm to shift the bellowphragm. The solenoid mechanism is activated in synchronization with the drive of the plunger pump, thereby minimizing the pressure ripples generated by the plunger pump.

Abstract: The disclosure is directed to an improved rotary compressor of a closed type which is provided with a pressure introducing passage communicated at its one end, with a compression space within a cylinder, and at its other end, with a small volume space formed in the cylinder portion for reducing high frequency component in the cylinder inner pressure so as to reduce undesirable noises during operation of the compressor.

Abstract: A hermetic reciprocating piston refrigeration compressor has a high efficiency muffler system. The suction muffler has an inlet adjacent the refrigerant return line and is made of an insulating material. It is mounted on a pair of suction tubes secured to the cylinder head and extending into the interior of the muffler. A discharge muffler system includes a pair of large muffler chambers formed partially in a cylinder block and connected by an external transfer tube. A large straight passage connects the discharge plenum in the cylinder head with one muffler chamber, while a discharge line extends from the other muffler chamber to the exterior of the compressor casing.

Abstract: A pump apparatus for transferring precise amounts of fluid from a container to a patient has a defined volume pump chamber divided by a first diaphragm to define a first chamber and a second chamber. A pumped fluid enters the first chamber through a one-way valve as the first chamber volume increases and is exhausted through a second one-way valve as the first chamber volume decreases. A third one-way valve is coupled to the first and second one-way valves in such a way as to prevent the pumped fluid from flowing through the pump in response to a pressure head at the input or output ports. A priming chamber is divided by a second diaphragm to define first and second sections, respectively. A passageway extends between the first section and the passageway connecting the second and third one-way valves.

Abstract: A fixed displacement pump including a variable capacitance flow regulator for absorbing the excess fluid flow from the pump which is not required by a hydraulic system. The variable capacitance flow regulator, in a hydraulic embodiment, includes a pair of pistons slidably movable within a housing for independent movement relative to each other. The fluid pressure in the hydraulic system is communicated to a first of the pistons to bias it to various positions within the housing depending upon the pressure level in the hydraulic system. The second or varibale capacitance piston is acted upon by the fluid pressure in the pump discharge chamber, and when the pressure in the hydraulic system exceeds the spring pre-load against the first piston, the first piston will be displaced away from the second piston.

Abstract: A fluid circulating system including a pump and an accumulator-reservoir device of the bootstrap type in which operation of the pump energizes the device to maintain a pressurized system despite an increasing fluid density caused by lowering fluid temperatures. A light spring force is applied which establishes a minimal system pressure effective even when the pump is shut off and which maintains in its proper convolution a rolling diaphragm comprised in the accumulator-reservoir device.

Abstract: A noise damping device is proposed for reducing and smoothing pressure fluctuations in a damping medium, especially in fuel supplied by fuel supply pumps, which serves to reduce pressure fluctuations downstream of the fuel supply pump. The noise damping device includes a diaphragm fluctuation damper which is disposed directly downstream of the pump compression collar and by means of which, by rotating the diaphragm fluctuation damper, an annular fitting is fixable in its axial position between the diaphragm fluctuation damper and the pump compression collar. A check valve in the connection extension of the diaphragm fluctuation damper or in the annular fitting prevents the return flow of fuel out of the fuel circulatory system after the termination of fuel supply.

Abstract: A metering fluid pump including a cylinder and a pumping piston movable therein, the cylinder being configured to define a liquid inlet chamber on one side of the piston and a liquid outlet chamber on the opposite side of the piston. A suction valve for the inlet chamber and a pressure valve for the outlet chamber open simultaneously when the piston is moving in a first direction to simultaneously pump liquid out of the outlet chamber and draw liquid into the inlet chamber. Both valves close when the piston is moved in a second reversed direction to transfer the liquid through a constricted conduit from the inlet chamber into the outlet chamber. In a second aspect of the invention an accumulator may be provided which receives liquid under pressure from the inlet chamber and which transfers the liquid into the outlet chamber when the piston is moved in the second direction and is at the end of its transfer stroke.