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Class 417/309 - Responsive to pump inlet condition


Subclass of Class 417 - Pumps
Definition: Apparatus in which the fluid flow control means is operated
No. of patents: 49
Last issue date: 06/21/2011


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NumberTitleIssue Date
7963749Fan with variable motor speed and disk type unloading device
A fan unit for use in an air delivery system. The fan unit comprises a variable speed control for controlling the speed of the fan wheel in combination with a disk-type unloader assembly for controlling the air flow in response to fan speed changes. The unloader dis...
06/21/2011
7309055Apparatus for flushing fluids from a tube
A tube flushing device has a shell having a first housing and a second housing connected on a side thereof so as to be movable between an open position and a closed position. A first pair of wheels are rotatably mounted in the first housing. A second pair of wheels ...
12/18/2007
7014427Capacity controller of capacity variable compressor
A small sized and structurally simple capacity controller having a wide control range of a compressor with variable capacity adds a differential pressure to an inhalation pressure on an arbitrary level by a piston valve body actuated by a solenoid and by the inhalat...
03/21/2006
6863504Fluid pump relief valve
A pump head for a fluid pump driven by a motor includes an inlet for receiving fluid at a first pressure and an outlet for outputting fluid at a second pressure greater than the first pressure. A relief valve cavity formed in the pump head housing includes a first p...
03/08/2005
6837692Self-priming centrifugal pump with internal series of diffusers and impellers and laminar valve
A centrifugal pump with facilitated self-priming, which comprises a casing with a suction inlet and a discharge outlet and with an internal series of diffusers and impellers, which form a cylindrical assembly that forms, together with the casing, an annular interspa...
01/04/2005
6695592Compressor provided with pressure relief valve
A compressor has a high-pressure relief valve and a low-pressure relief valve. The high-pressure relief valve in use for a discharge region opens when the pressure of gas in the discharge region is more than a first predetermined pressure. The high-pressu...
02/24/2004
6672845Apparatus for preventing vacuum compression of scroll compressor
An apparatus for preventing vacuum compression of a scroll compressor comprising: a suction tube and a discharge tube each combined to one side of a closed container filled with oil to an adequate height; a fixing scroll having a wrap and a coolant inlet ...
01/06/2004
6609898Process and device for pumping compressible materials with reduced pressure pulsation
A hydraulic system for a reciprocating piston pump that includes an accumulator for producing a steady-pressure supply of compressible material to a distribution nozzle. The hydraulic system includes an adjustable means for constricting the flow of hydrau...
08/26/2003
6487903Method and system for determining pump cavitation and estimating degradation in mechanical seals therefrom
A method and system for determining pump cavitation is disclosed. In accordance with the principle of the invention, changes in dynamic fluid pressure within a pump are monitored and compared to a determined cavitation alarm pressure. The determined cavit...
12/03/2002
6217288Method and apparatus for limiting a critical variable of a group of compressors or an individual compressor
This invention discloses a method for limiting a critical variable (such as, discharge pressure or suction pressure or pressure ratio) of either a compressor station or an individual compressor when these machines are subjected to large, fast disturbances...
04/17/2001
6129519Variable displacement compressor in which a displacement control is improved at an initial stage of the start-up thereof
For controlling a displacement depending on a pressure differential between a crank chamber (9) and a suction chamber (4), a compressor is provided with a bleed passage (46) establishing communication between the crank chamber and the suction chamber and ...
10/10/2000
6059547Cylinder injection high-pressure fuel pump
A cylinder injection high-pressure fuel pump permits reduction in size and cost thereof and it is also capable of securely absorbing high-frequency pulsations. The cylinder injection high-pressure fuel pump (200) has: a casing (1) in which an inlet passag...
05/09/2000
6053712Cylinder injection high-pressure fuel pump
A cylinder injection high-pressure fuel pump prevents the pulsations of fuel generated by a high-pressure fuel pump from spreading to a low-pressure pipe connected to a low pressure end. The cylinder injection high-pressure fuel pump has: a casing (1) in ...
04/25/2000
6036450Variable capacity vane compressor
A variable capacity vane compressor includes side members secured to opposite end faces of a cylinder block, respectively, and a rotary plate mounted in one of the side members, for adjusting compression starting timing of the compressor to thereby increa...
03/14/2000
5971719Hydraulic control device of automatic transmission
A hydraulic control device of an automatic transmission is provided wherein three-stage valve bodies are superposed on and fixed to each other with partition plates interposed therebetween, and a pressure regulator valve is mounted in a middle-stage valve...
10/26/1999
5915929Low power electromagnetic pump
An electromagnetic pump having an electromagnet carried by the housing external to the fluid chambers, and an armature moveable in the housing having a pole magnetically attracted by the electromagnet and a piston to force fluid out of the chambers and th...
06/29/1999
5873707Fluid displacement apparatus with variable displacement mechanism
A control mechanism for a fluid displacement apparatus is disclosed. The control mechanism controls fluid communication between an intemediate pressure chamber and a suction chamber of the fluid displacement apparatus, which has a communication channel ex...
02/23/1999
5807081Combination valve for screw compressors
Normally closed valve structure is located in a fluid path between the suction and discharge sides of a compressor. The valve structure opens upon a small pressure differential when the higher pressure is in the normal suction side which is indicative of ...
09/15/1998
5797733Low power electromagnetic pump
An electromagnetic pump comprising a housing having fluid receiving and pumping chambers in communication with an inlet and outlet, respectively, an electromagnet carried by the housing external to the fluid chambers thereof, and an armature movable in th...
08/25/1998
5513959Valve for pump with priming circuit
A pump with a priming circuit containing a valve having a seating with an orifice and an obturator mounted so as to be able to be applied onto the seating in front of the orifice, where the obturator is a resilient blade embedded on one side to the seatin...
05/07/1996
5472318Rupture disk pressure relief assembly for a paint pump
A pressure relief assembly for use with a paint pump having a chamber with a pressure relief port located immediately adjacent an inlet port of the pump. The pressure relief assembly includes a mounting member, inlet washer, rupture pad and outlet washer....
12/05/1995
5352098Turn valve control system for a rotary screw compressor
An apparatus for regulating the fluid throughput of a rotary screw compressor from a full capacity operating condition to a desired predetermined capacity operating condition includes a turn valve or spiral valve which is disposed in fluid communication w...
10/04/1994
5333999Variable displacement compressor
A variable displacement compressor includes a housing having therein a space, a rotor eccentrically disposed in the space of the housing so as to define a compression chamber and an intake chamber in the housing, a bypass passage formed in the housing for...
08/02/1994
5316448Process and a device for increasing the efficiency of compression devices
In cryogenic applications a compression device circulates a fluid, such as helium, in a closed cooling circuit. The compression device includes at least one compressor, preferably a helical compressor, with a bypass valve connected in parallel thereto, wh...
05/31/1994
5292234System for preventing cavitation in an hydraulic pump
In a positive displacement hydraulic pump (68), a system for preventing cavitation includes a regulator valve, a valve spool (74) formed with control lands (76,78) moveable within a bore (72) communicating with control pressure taken at an inlet port (100...
03/08/1994
5154202Low forward pressure burst-high backpressure resistant rupture disc
A fluid pressure relief assembly for a system operating under an elevated pressure includes a support structure having means defining a bore therethrough of desired cross-sectional configuration, the support structure being provided with a shoulder extend...
10/13/1992
5112199Fluid pump unit with flow control valve
A fluid pump unit has a flow control valve which returns a portion of a working fluid discharged from a pump assembly when rotation speed of a rotor increases to become greater than a predetermined value. The flow control valve includes an essentially cyl...
05/12/1992
5052900Pressure relief valve for positive pressure pumps
A pressure relief valve for positive pressure pump systems in which fluid is displaced from the inlet to the outlet of the pump. The pressure relief valve includes a bypass tubing member interconnecting the outlet and a lower pressure area such as the inl...
10/01/1991
4932844Control section for a control system for controlling the internal volume of a rotary compressor
For controlling the internal volume of a rotary compressor (5), adjustable valve bodies (3) are used on the outlet side. External control means, often of an extremely complicated nature, have previously been used to control the internal volume in the rota...
06/12/1990
4928723Capacity control valve for a compressor
An improvement in a capacity control valve for use in a fluid compressor with a relatively high pressure HP and a relatively low pressure LP for changing the operational characteristics thereof by using the relatively high pressure HP taking into consider...
05/29/1990
4913629Wellpoint pumping system
A wellpoint pumping system having a frame and a positive displacement rotary pump for pumping air, water or a mixture thereof mounted on the frame. The pump has two rotors with intermeshing lobes mounted on horizontal and parallel shafts, an inlet port be...
04/03/1990
4904164Scroll type compressor with variable displacement mechanism
A variable displacement type compressor is disclosed. The compressor includes a housing having fluid inlet and fluid outlet ports. A fixed scroll is disposed within the housing and has a circular end plate from which a first spiral element extends. The en...
02/27/1990
4886425Capacity control device of scroll-type fluid compressor
A capacity control device controls an amount of fluid bypassed from a compression chamber formed between contacts of a stationary and revolving spiral elements into a suction chamber by an actuator. The capacity control device provides a feedback mechanis...
12/12/1989
4733536Integrated mechanical vapor recompression apparatus and process for the cogeneration of electric and water-based power having a recirculation control system for part-load capacity
Disclosed are a method and apparatus for selectively generating different amounts of electric power and high pressure steam power according to the user's needs, using a fluid-cooled engine and a dual-function screw machine that may be operated as either a...
03/29/1988
4662181Method and apparatus for extending the duration of operation of a cryogenic pumping system
The duration of a pumping operation from a fixed supply of cryogenic liquid is extended by minimizing the amount of cryogenic liquid which is recirculated between a primary cryogenic pump and a storage tank for containing the cryogenic liquid. The primary...
05/05/1987
4557670Compressor
A compressor bypass passage has an inlet portion and an outlet portion which is connected to the suction passage. The inlet portion of the bypass passage has an opening which is able to be open to the compression chamber when the compression chamber is in...
12/10/1985
4544333Capability control apparatus for a compressor
A capability control apparatus for a compressor wherein gas sucked into a compression chamber is compressed due to a decrease in volume of the compression chamber. The pressure of the gas sucked into the compression chamber, in response to an increase or ...
10/01/1985
4529364Casing gas pump
A casing gas pump is reciprocated by the pump jack of an oil well. Push rods slidable within rigid vertical cylinders are connected by a bridle bracket to bridle cables depended from the pump jack horsehead. Vertical reciprocation of the horsehead moves p...
07/16/1985
4505647Vacuum pumping system
In a two-stage vacuum pumping system having a single drive motor powering both stages, a by-pass line connected between the container being evacuated and the interstage line between the two stages for relieving excess pressure in the interstage line durin...
03/19/1985
4413951Capacity control arrangement for fixed speed compressor
A two-stage reciprocating compressor has its low pressure stage inlet connected to a source of gas generating a varying volume of gas. When the supply of gas generated is reduced to an extent that the pressure at the low pressure stage inlet decreases bel...
11/08/1983
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