Abstract: An inlet throttle valve for supplying liquid to a high-pressure pump has a fully open start position and an operating range where flow through the valve is determined by a pressure balance of a valving member independent of the pressure of oil supplied to the inlet throttle valve. The valve includes a hydraulic stop limiting closing movement of the valving member. The valve may be used to flow low-pressure oil to a high-pressure pump for supplying high-pressure oil to HEUI injectors or other components of an internal combustion engine.

Abstract: The present invention provides a piston type small discharge pump capable of reducing a dead volume and effects of unbalanced load to the piston shaft, and being self-priming. The fluid taken through a inlet port is introduced into a cylinder portion via a flat type check valve, and discharged into a discharge port through a discharge hole and a check valve as a piston moves up and down. A flat type check valve is provided in the vicinity of a bottom dead center of the piston and a spring for biasing the piston upwardly is provided outside the cylinder portion, thus reducing the dead volume.

Abstract: A gas compression apparatus for a reciprocating compressor includes a reciprocating motor generating a linear reciprocal driving force, a compressing cylinder positioned within a predetermined distance from the reciprocating motor, a position controlling cylinder positioned within a predetermined distance from the compressing cylinder, an initial position variable type piston inserted into the compressing cylinder and the position controlling cylinder, and being linearly and reciprocally moved within the compressing cylinder and the position controlling cylinder, and a pressure controlling valve controlling a pressure inside the position controlling cylinder with the pressure of the gas discharged from the discharge chamber.

Abstract: A throttle element with a gap filter for use in a fuel pump is proposed, which is press-fitted into a conduit in the housing of an injection pump. By means of the press fitting, a good sealing action and at the same time low-cost production and mounting are attained. The throttle element can furthermore be designed economically and compactly.

Abstract: A fuel injection system for internal combustion engines essentially has a high-pressure injection pump, supplied with fuel from a low-pressure region, and a magnetic piston valve serving to control the injection pump. The magnetic valve having two coaxial valve chambers, communicating with one another through a valve opening but separable from one another by a valve seat, and an armature chamber. The armature chamber communicates with the inlet side via a pressure conduit, and the low-pressure valve chamber communicates with the outlet region of the injection pump. The low-pressure valve chamber has a fuel inlet conduit and a fuel outlet conduit, both of which have a gradually tapered cross section compared to the cross section of the remaining regions of the fuel inlet conduit and fuel outlet conduit. Maximal prevention of cavitation is successfully achieved in the region of the low-pressure valve chamber and hence cavitation erosion that is possible as a consequence of cavitation.

Abstract: A two-way manually operated pump structure consisting of a pump body, a nozzle mount, a control ring mount, and other structural components that are assembled together, in which rotating the control ring mount shifts the air direction between them and thereby enables manual inflation and deflation operation.

Abstract: The pump has a body including at least a fuel compression chamber and an actuating chamber enclosing the actuating members of the pump. The on-off valve has a shutter sliding inside a hole in the body to close a fuel feed conduit. The shutter is held in the closed position by a compression spring, which rests directly or indirectly on a shoulder in the hole. In one embodiment, the spring rests on the shoulder via a perforated disk held by a retaining ring, which clicks removably inside an annular groove in the hole. In a further embodiment, the spring rests directly on the shoulder.

Abstract: A hydraulic pump has a pair of inlets each with a pair of outlets. The inlets and outlets are arranged to balance the forces on the motor. The flow from the outlets of each pair may be combined to maximize flow or separated to reduce power consumption by recirculating the flow from the outlet to the inlet.

Abstract: The invention relates to a piston pump for a vehicle brake system, in particular a slip-controlled hydraulic vehicle brake system. For damping pressure pulsations, the invention proposes proving a throttle, as a place of narrowed cross section, in an outlet conduit of the piston pump.

Abstract: An improved vacuum adjustment mechanism for controlling airflow into a chamber which is subject to negative pressure, such as the chamber of a diaphragm pump which is generating vacuum for a breast shield assembly, has an air inlet conduit communicating with the chamber. A channel is formed in a base member, with the channel having a longitudinal length and a dimension perpendicular to that length. The perpendicular dimension varies from a minimum to a maximum. The channel has a bottom and is open, such as along a channel top. An airhole is formed in the channel bottom at the point of the maximum dimension. A rotary member is mounted on the base member, and has an internal channel extending across the longitudinal length of the base member channel, and overlies the channel top. The internal channel of the rotary member communicates with an air source, such as ambient air.

Abstract: This invention provides a pump with a close-mounted valve for a hydraulic fuel system in an internal combustion engine. The hydraulic fuel system may have a high pressure pump connected to a low pressure side and high pressure reservoirs. The pump has a drive shaft, a shaft cylinder, one or more cylinders, and a close-mounted valve. The close-mounted valve has a valve body, a valve spool, a valve spring, and a valve coil. The valve body is positioned inside a shaft cavity formed by the shaft cylinder. The close-mounted valve may control the volume and pressure to reduce or eliminate the dumping of high-pressure hydraulic fluid in the hydraulic fuel system.

Abstract: A pump assembly for a penile implant is provided having a mechanism that prevents spontaneous inflation of the cylinders implanted within the patient. The preventative mechanism includes a switching mechanism for moving a valve into either a closed or an open position. When closed, the locking valve prevents fluid flow in an adverse direction. While open, the pump functions normally allowing the cylinders to be inflated.

Abstract: The pump has a body including at least a fuel compression chamber and an actuating chamber enclosing the actuating members of the pump; the on-off valve is defined by an independent operating assembly insertable in fluidtight manner inside a hole in the body; the hole connects an inlet conduit to the actuating chamber and to a feed conduit of the compression chamber; the assembly of the valve has a sleeve in turn having an opening located at the fuel feed conduit and which is closed by a shutter sliding inside the sleeve; the sleeve has two seats for two seals located on opposite sides of the opening; and the feed conduit is straight, and can be formed using a drilling tool through the hole.

Abstract: A scroll type compressor includes a fixed scroll member and an orbital scroll member disposed within a housing for defining a compression pocket compressing refrigerant gas, an open portion provided on the fixed scroll member at a position corresponding to an intermediate compression stage position of the compression pocket, and a mechanism for discharging refrigerant gas intermediately compressed in the compression pocket out of the compressor through the open portion. The refrigerant gas discharging mechanism includes a gas discharging path formed in the housing itself to communicate the open portion, without providing a particular member. The number of parts for forming a gas discharging route may be decreased, and the structure therefore may be simplified. The assembling ease of the compressor may be greatly improved. An excellent high-efficiency and low-load operation of the compressor may be achieved.

Abstract: An apparatus for making a sterile emulsion, comprising a fluid pathway, a pumping bore, a reciprocable (reciprocal) member, and a valve body. The pumping bore being in fluid communication with the fluid pathway and having a reciprocable member reciprocably disposed in the pumping bore. The reciprocable member having first portion disposed in fluid communication with the fluid pathway and a second portion isolated from the fluid pathway, said second portion having a sterilant passage adjacent thereto. The fluid pathway, reciprocable member first portion and reciprocable member second portion may be sterilized and one or more emulsion constituents may be directed into the fluid pathway defined by the piston apparatus after sterilization. The valve body defines a valve bore in communication with the fluid pathway and a valve plunger disposed therein. The valve body may also be configured to maintain emulsion sterility.

Abstract: An axial piston pump of the swash-plate variety having a rotating cylinder block and pistons movable in a longitudinal direction within bores formed in the block, and having a reversing capacitance for reducing pressure pulsations. For the further reduction of such pulsations, one or more channels, each having an associated discharge opening, are formed into a web of the valve plate of the pump to sequentially couple the reversing capacitance into fluid communication with the cylinder bores passing across the web.

Abstract: A swash plate type compressor comprises a cylinder block; a rotation shaft rotatably held in the cylinder block; a swash plate swingably connected to the rotation shaft to rotate therewith; a plurality of piston bores circumferentially arranged about the rotation shaft; a plurality of pistons operatively received in the piston bores respectively, each piston having a holding portion that slidably holds a peripheral portion of the swash plate, so that when the rotation shaft is rotated about its axis, the swash plate pulls and pushes the pistons thereby to reciprocate the same; a valve plate connected to a rear end of the cylinder block, the valve plate having a group of inlet openings connected to the piston bores respectively and another group of outlet openings connected to the piston bores respectively; a rear head connected to the valve plate, the rear head having an intake chamber exposed to the inlet openings and a discharge chamber exposed to the outlet openings, the intake chamber surrounding the disc

Abstract: In a variable displacement compressor of a piston type, a valve body (34) is movably placed adjacent to a main channel (32) communicating a suction port (26) with a suction chamber (24). The valve body is for variably controlling an opening area of the main channel. An air damper (38) is coupled to the valve body to damp vibration of the valve body. In addition, a bypass channel (39) is formed outside of the air damper to communicate the suction port with the suction chamber.

Abstract: A positive displacement pump system has first and second delivery passages for pumped fluid and a main delivery passage receiving flow from the first delivery passage and, via a non return valve, from the second delivery passage. A control valve is provided to apportion flow from the first and second delivery passage to an overspill port. A pressure sensitive control orifice is provided in the main discharge passage to receive the combined flows and the control orifice is of variable size.

Abstract: In a compressor for compressing a gaseous fluid, a control valve (22) is arranged for controlling an open area of a suction passage (17,18) which is for introducing the gaseous fluid. In a first state where the gaseous fluid has a relatively low flow rate in the suction passage, the open area of the suction passage is reduced. On the other hand, in a second state where the gaseous fluid has a relatively high flow rate in the suction passage, the open area is increased.

Abstract: The present invention provides a pump drive assembly for a deep well, submersible, progressing cavity pump that includes an internal hydraulic pump for slowing the counter rotation of the polished rod induced by recoil in the sucker rod. The pump drive assembly includes a housing enclosing a hydraulic fluid reservoir and a gear chamber separate from the reservoir. A drive shaft extends into the housing and includes a drive gear integral with or keyed to the drive shaft. A main shaft also extends into the housing and includes a main gear integral with or keyed to the main shaft. The main gear is engaged with the drive gear within the gear chamber, where the gear chamber includes an inlet and an outlet channel providing fluid communication between the gear chamber and the reservoir, so that the gears form a reversible gear pump within the housing. The reversible gear pump operates to pump hydraulic fluid from the reservoir into the gear chamber and back into the reservoir.

Abstract: A suction-throttled pump, comprising at least one displacement body for the delivery of a medium and movable in a delivery chamber, into which opens at least one inflow channel extending between the delivery chamber and a suction chamber, and comprising a suction control valve, the pump being characterised in that the suction control valve (33; 33′; 33″) co-operates directly with the inflow channel (25; 25′) and is arranged at the end thereof facing the suction chamber (27).

Abstract: A curvilinear peristaltic pump for facilitating the pumping of a liquid through a length of resilient tubing. The pump comprises a housing having a platen member attached thereto and a rotatable cam disposed therewithin. Also disposed within the housing is a drive unit of the pump which is mechanically coupled to the cam such that the activation of the drive unit results in the concurrent rotation of the cam in a first direction and the deactivation of the drive unit maintains the cam in a set position. Movably attached to the housing are a plurality of pump fingers of the pump, each of which has a first end which is cooperatively engaged to the cam and a second end which is disposed in spaced relation to the platen member. The cam is configured to sequentially move the pump fingers radially outwardly toward and inwardly away from the platen member when rotated in the first direction by the drive unit.

Abstract: A medical perfusion system for use in connection with the medical treatment of a patient is provided with a first type of perfusion device in the form of a blood pump adapted to pump blood through a fluid conduit connected to the patient and a second type of perfusion device in the form of a sensing device adapted to sense a condition and generate a sensing signal relating to the condition. The perfusion system also includes an electrical power network having an electrical power line, means for selectively connecting the perfusion devices to the electrical power network, and a controller with an input device for accepting control commands from an operator. The perfusion system could also include a control device, such as a pump, a plurality of sensing devices, and means for specifying the sensing device that the control device should be accept feedback from.

Abstract: A throttle element installed in a blind bore of a connecting conduit which delivers fluid to cool an electromagnet. The throttle element includes a filter region upstream of a throttle which throttles flow of the fluid from an annular groove to the blind bore that connects with the electromagnet.

Abstract: A valve assembly that is composed of simple parts is described that is used to provide a sump pit water control device that operates due to the level of water within the sump and not by electricity. This valve assembly includes an adapter in the form of a tee-pipe that is capped at one end and attached at the other end to a drain tile pipe entering the sump. The third and remaining end of the tee-pipe is open but has a valve disposed therein that is operable between two positions. A float member is attached to the valve member by way of a cable so that as the water level rises in the sump, the valve member is drawn closed, and when the water level is at a normal or low level, the valve member is biased into an open position by a spring.

Abstract: An interface apparatus for fan monitoring and control includes a current source amplifier that generates a programmable current in response to its input voltages. Associated with an output capacitor, which is able to reduce noise, the programmable current drives the fan at a desired speed. The rotating fan induces a ripple signal in the output capacitor, which is fed to a band-pass amplifier to produce a tachometer pulse. Through a buffer amplifier, an input control signal combined with a thermal sensor signal has direct control over the current source amplifier. Alternatively, a PWM circuit having a comparator, a ramp oscillator and the output of the buffer amplifier drives the current source amplifier in switching mode. Since the ramp oscillator can be synchronized by the input, both analog and pulse signals can function as the input control signals.

Abstract: A liquid chemical delivery system (20) has a pump (27) driven by an electric motor (28) to draw a liquid from a bottle (21) and dispenses the liquid into a septic system (12). Separate independent controls (36,37) connect the electric motor (28) with a source of electric power (34). One of the controls (253) has a wireless remote switch (273) operable to trigger an electronic control unit (268) to activate the electric motor (228) that drives the pump (227) to deliver liquid to the septic system (212).

Abstract: A safety valve apparatus (25) for feeding predetermined liquid (21) from a tank (22) to a diaphragm pump (1) in which a central rod (3) is reciprocally slidable by air pressure to forcibly pump out the liquid. The safety valve apparatus includes a housing (27, 28, 29) having a space (40) including a liquid balance port (28a) that is always in communication with the liquid in the tank, and a liquid chamber (31) including a liquid flow-in port (29a) into which the liquid from the tank flows, and a liquid flow-out port (29b) from which the liquid from the tank flows out. A valve rod slidably passes through the housing and is provided at its end near the liquid chamber (31) with a valve body (45) that is capable of being seated in the flow-in port (29a). Also, a diaphragm (34) is disposed within space (40) so as to be attached between the valve rod (32), which protrudes into the space (40), and an inner peripheral wall of the space.

Abstract: A hybrid electric hydraulic drive system, having a first cylinder (75) having a left chamber (32) and a right chamber (34) separated by a piston (22). A second cylinder (76) has a single or sole chamber (74) for receiving hydraulic fluid with the second cylinder enclosing a second piston (78). The second cylinder is substantially equal in length to the first cylinder and is rigidly attached to the first cylinder. A pump (14) is fluidly connected to the left chamber (32) by a first fluid passage (16) and is fluidly connected to the right chamber (34) by a second fluid passage (18). A third fluid passage (80) is directly connected to the right chamber (34) and to the sole fluid chamber (74) of the second cylinder (76). A first rod (30) is connected to the piston (22) and a second rod (84) is connected to the second piston (78). The first and second rods are connected by a connecting element so the rods move in unison.

Abstract: A fluid pressure source apparatus includes a pump, an accumulator for receiving pressure from the pump, a pressure switch for detecting the pressure in the accumulator, an electric motor for driving the pump, and a motor control device for driving the motor when the pressure switch detects a low pressure. A current detecting device detects a motor current value of the motor and a control unit determines whether the accumulator or the motor is experiencing an abnormality based on the motor current value. The control unit determines whether the motor current value occurring during a first set time following the start of driving of the motor is greater than a first set value. If the motor current value is not greater than the first set value, the control unit determines that the current detecting device is experiencing an abnormality. If there is no such abnormality information, the control unit compares the motor current value with predetermined values.

Abstract: For a refrigerant compressor having two capacities, a camming structure operable in different manners depending on direction of crankshaft rotation, to achieve each capacity while providing top dead center piston operation thru the use of a circular cam bushing which is eccentrically, rotatably mounted on the crankshaft eccentric and within the connecting rod bearing wherein the combined eccentricities of the bushing and the eccentric equal the primary stroke of the piston. A first stop mechanism is provided for stabilizing the bushing on the eccentric upon rotation of the crankshaft in one direction whereby the eccentricities of the eccentric and bushing become aligned and remain so during synchronous rotational orbiting motion of the eccentric and bushing during rotation of the crankshaft for producing full stroke and full capacity.

Abstract: A safety pumping system including a pump (19) and an electric motor (15) is adapted to be immersed in a fluid (11) contained in a tank (10). The electric motor and the pump are interconnected by a driving shaft (23). The electric motor is enclosed in a motor housing, which defines an inner space (18). The motor housing is surrounded by an outer shell or jacket (14), which defines an outer space (17) between the outer shell and the motor housing. In order to reduce the risk of explosions when the pumping system is immersed in an inflammable liquid, protective gas, such as nitrogen, at a superatmospheric pressure is supplied to the inner space (18) of the motor housing (15). Protective gas is also supplied to the outer space (17) defined by the outer shell of jacket (14). The gas pressure within the inner space (18) preferably exceeds the gas pressure within the outer space (17), which preferably exceeds the atmospheric pressure.

Abstract: A photoresist dispense pump receives photoresist from two pipelines, a first pipeline and a second pipeline, and pumps out the photoresist through a third pipeline. The photoresist dispense pump contains a first bellows and a second bellows receiving photoresist from the second pipeline, wherein the first bellows and the second bellows are separated by a partition. Photoresist is fed into the third pipeline from the second bellows. On the center region of the partition, there is a central diaphragm that allows photoresist to flow in a direction from the first bellows toward the second bellows, but not in the reverse direction.

Abstract: A gas ballast system for a multi-stage positive displacement pump in which a first stage includes at least one positive displacement pump stage, is equipped with an inlet valve and an outlet valve, and is connected with the following stage by an intermediate vacuum chamber, with the gas ballast system including a first conduit for supplying gas into the intermediate vacuum chamber, and a second conduit for supplying gas from the intermediate vacuum chamber into a pump chamber of the first stage or to a suction region of the first stage.

Abstract: A d.c. controller pump includes electronic control mechanisms that permit regulated control within a fluid flow system. A pump head is coupled to a housing allowing the fluid to infiltrate the region surrounding a permanent magnet rotor. Stator windings and control electronics fixed to a plurality of printed circuit boards are isolated from the fluid by means of a solid body that encapsulates the stator windings and seals the rear of the cavity. Hall effect sensor-generators and other assemblies are fixed within the solid body to enhance integrity and reduce parts count. Associated electronics includes a readily-removable circuit board for housing auxiliary electronic functions. The board is mounted in parallel at the rear of the pump housing with boards of sensor and controller electronics. The auxiliary function electronics pump configurations enable both fixed and variable speed operation in accordance with fluid flow system design and parameters.

Abstract: A rotary pump includes a housing having an inner surface that confines a rotor chamber. Two parallel shafts are mounted pivotally on the housing and extend axially through the rotor chamber. Two meshing multi-lobe rotors are mounted on the shafts within the rotor chamber, respectively. Each of the rotors has a plurality of lobes projecting radially therefrom toward the inner surface without contacting the inner surface.

Abstract: An emergency shutdown system for a water-circulating pump monitors the vacuum on the influent side of a pump. The system includes a vacuum switch connected to the influent side of the pump by a vacuum line. The vacuum switch is connected to a pump shut-off switch which is, in turn, connected to the motor of the pump. When one of the influent lines leading to the pump becomes clogged or blocked, the vacuum switch, through the vacuum line, senses the increased suction and delivers an electrical shut-off signal. The pump shut-off switch opens in response to the electrical signal, thereby interrupting line power to the pump. Audible and visual alarms are also electrically connected to the vacuum switch. A main switch, including on, off, start and vacuum bypass positions, is included for manually activating and deactivating the pump motor and for enabling the pump to operate under selected high vacuum situations without deactivating the alarms.

Abstract: A multistage vacuum pump unit having a plurality of separate single-stage pumps connected in series with each other by exhaust pipes, the exhaust pipes each connecting a suction port of one of the adjacent single-stage pumps with an exhaust port of another of the adjacent single-stage pump; motors for driving the separate single-stage pumps respectively; driving device for varying a revolution of one of the single-stage pumps that is at least in contact with an atmospheric side; driving current detection device for detecting a driving current of the motor for driving the single-stage pump that is in contact with the atmospheric side; pressure detection device for detecting a pressure at a vacuum-side inlet; and control device for controlling revolutions of the motors of the single-stage pumps based on the pressure detected by the pressure detection device.

Abstract: A method and an apparatus for controlling a displacement-type fluid machine which handles fluid including gas and/or liquid for increasing or decreasing pressure of the fluid or transporting the fluid including the use of an alternating current motor for driving the displacement-type fluid machine and a frequency converter which is capable of conducting frequency conversion up to a range higher than the power source frequency to adjust the number of revolutions of the motor. Wherein the number of revolutions is adjusted so that input current to the motor is kept constant, regardless of any change in operating pressure of the displacement-type fluid machine, whereby the displacement-type fluid machine is operated maintaining the process values within an allowable limit without effecting repeated actuation and stopping of the machine.

Abstract: A submergible pumping unit for raising viscous fluids from a well is driven by an electronic drive and control system, a first portion of which is located above the well, and a second portion of which is coupled to the submergible pumping unit. The drive and control system includes a power supply circuit located above the well for converting AC power from a source to DC power having current and voltage levels. The DC power is transmitted to the pumping unit via a two-conductor DC bus cable. The pumping unit includes a switching circuit which receives the DC power for driving a submergible motor, such as a permanent magnet brushless motor. The speed of the motor, and of a pump coupled thereto, is proportional to the voltage of the DC power applied to the pumping unit. The pump is preferably a progressive cavity pump, and the drive and control circuitry provides sufficient torque to start the pump from a static condition.

Abstract: A submersible motor unit comprises an electrical drive motor, an electrical control means for setting the rotary speed and/or the torque of the motor, a common heat-conducting housing for the motor and the control means as well as a connection cable electrically connected to the control means wherein this means is provided on the end side of the motor distant to the pump. In particular for an improved disposal, repair and cooling of the submersible motor unit the electrical control means is formed as a cartridge-like constructional unit which can be inserted into the common housing and which can be electrically plug connected to the drive motor, and the housing of the control means connected to the unshielded connection cable bears with its outer circumferential surface on the inner circumferential surface of the common housing.

Abstract: A flow-regulating arrangement for a hydraulic transport device such as a vane-cell pump includes partial-transport flow throttles which operate independently of one another and which are arranged in parallel to deliver output of the hydraulic transporting device to a hydraulic load. One of the partial transport flow throttles responds to the pressure difference between working pressure of the hydraulic transporting device and pressure within a pressure chamber internal to the device.

Abstract: A motor speed controller for a shaded pole ceiling fan motor having low audible noise, includes a burst period generator for generating gating signals of a duration varying between a preselected minimum equal to at least one wavelength of an AC drive signal to the motor, and a maximum equal to a large number of wavelengths, and a controlled switch such as a triac, connected between the power source and fan motor, and having a gate terminal connected to the burst period generator.

Abstract: A ceiling fan includes a tube having one or more holes and includes a stator secured to the middle portion of the tube and a rotor rotatably secured to the tube and engaged around the stator for forming a ceiling fan motor. One or more electric wires are engaged through the tube and engaged through the holes. One or more protecting grommets are engaged in the holes for preventing the electric wire from being engaged with the peripheral portion of the hole and for preventing the electric wire from being damaged by the peripheral portion of the tube.

Abstract: A remote control and indication system for an electric device (20, 22) in a sanitary environment comprises: at least one light carrier (42; 50) for indicating operational status information about the electric device to a user present in the sanitary environment, a first end (43) of said light carrier receiving light from at least one light source (46; 56a-b) in response to the operational status of the electric device; and control means (40; 52) for controlling at least one function of the electric device (20, 22), said control means being connected by at least one pneumatic or hydraulic pressure line (41; 51) to the electric device. The control means (40; 52) and a second end (44) of the light carrier (42; 50) are adjacently arranged at a position in the sanitary environment, which is visible and accessible to the user.

Abstract: A protection system for a scroll machine provides temperature, mis-wiring and vibrational protection for the scroll machine. The vibrational protection comprises a vibration sensor which is integrated on the circuit board of the protection system. The vibration sensor, in conjunction with at least one timer, monitors the vibrations of the scroll machine and will shut down the machine when excess vibrations are sensed over a prespecified period of time. The temperature system monitors operating temperature conditions and the mis-wiring system monitors the power supplied to the compressor. Once an undesirable characteristic is identified, the operation of the scroll machine is stopped. These protection systems are integrated into a single module which identifies the reason of shutting off the scroll machine in order to simplify repairs needed.

Abstract: A turbo vacuum pump has a rotor and magnetic bearings. The magnetic bearings are held in a housing having a suction port and an exhaust port, and support the rotor rotatably. A peripheral flow pump stage and screw pump stage are formed in the rotor, so that the pressure at the exhaust port can be at or near atmospheric pressure level. Before starting the turbo vacuum pump, the magnetic bearings are operated to displace a rotor position and to scrape off the reaction products which have deposited inside the pump. In addition, before starting the turbo vacuum pump, a stator of the pump is heated up to decrease a binding force of the reaction products. Therefore, the pump can be restarted, even if the rotor has locked by the solidification of deposited reaction products formed during stopping of the pump.

Abstract: A control assembly for a pump includes a ripple-effect removing valve and a pressure detecting device. The ripple-effect removing valve includes a casing having a lower inlet end in fluid communication with a hollow body of the pump, an upper outlet end and an interior fluid passage which fluidly communicates the inlet and outlet ends and which includes a generally upright lower section with a top opening, a generally upright upper section with a bottom opening, and a substantially horizontal intermediate section fluidly communicating the upper and lower sections. The valve further includes a regulator for controlling fluid flow from the lower section to the upper section. The pressure detecting device is fluidly communicated with the upper outlet end of the casing, and deactivates an impeller unit of the pump when the pressure of the fluid entering the pressure detecting device via the fluid passage of the casing reaches a predetermined value.