Class 417/428 - Bypass control

Subclass of Class 417 - Pumps
Definition: Apparatus in which at least one of the pumps has means to
No. of patents: 39
Last issue date: 08/15/2006

Number	Title	Issue Date
7090473	Multiple stage pump with multiple external control valves A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations and shot to shot fuel variations. ...	08/15/2006
7090475	Hydraulic control circuit for a hydraulic engine with at least two speeds A hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side being connected to the discharge side with a bypass connection by a valve arrange...	08/15/2006
6932583	Multiple stage pump with multiple external control valves A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations. The multiple stage pump includes a first pump in a first stage ...	08/23/2005
6869274	Method of reducing pressure peaks in a fuel injector A multiple stage pump having valves upstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations. The multiple stage pump includes a first pump in a first stage an...	03/22/2005
6623249	Pump and pumping method Pumps and methods for inflating objects with atmospheric air employ a fan pump to quickly fill the object with air and then shunt away the air from the fan pump, and use a diaphragm pump to increase the pressure until the inflatable object attains the fir...	09/23/2003
5842837	Tandem pump apparatus A tandem pump apparatus is featured having a main suction passage connected to a fluid source. The main suction passage branches into first and second suction passages which, in turn, feed into first and second pumps. Each pump discharges a portion of the...	12/01/1998
5775881	Oil supply system The present invention relates to an oil supply system with at least one pressure and/or volume dependent controllable pump (1) and an oil tank (5) or the like from which the pump draws oil and delivers it with controlled output pressure or output volume t...	07/07/1998
5609474	Gear pump A gear pump having three gears, including; a pump case consisting of a pump body and a cover for covering most of the body; three gears which are supported by a rotating shaft on the pump case and engaged with each other in series; first and second gear p...	03/11/1997
5490765	Dual stage pump system with pre-stressed diaphragms and reservoir An improved dual-stage pump system is provided for the accurate pumping and filtering of viscous fluids. Two hydraulically activated pumps are provided in series with a filter and reservoir disposed in-line between the two pumps. The reservoir acts as a s...	02/13/1996
5435703	Air pump with pressure releasing member An improved air pump comprises at least two parallel cylinder chambers communicating via two channels with a receiving space in which an air valve connecting device is disposed for injecting high pressure air into an object to be inflated. A pressure rele...	07/25/1995
5199854	Hydraulic supply arrangement for use with active automotive suspension or the like The first of two serially arranged electromagnetically operated spool type drain control valves is conditioned to select the drain passage of smaller the pump before the second valve is moved from its closed or communication cut-off position, to its open ...	04/06/1993
5163542	Clutch actuating hydraulic circuit A switch-over valve 6 is provided in a pressure circuit 31 between a hydraulic pump 2a and a clutch 7, and a pressure limiting valve 5 is provided between a reflux circuit 9 for the valve 6 and the pressure circuit 31. The clutch actuating hydraulic circu...	11/17/1992
5158150	Hydraulic wheelchair A hydraulic system for powering a vehicle for human transporation. The output of a hydraulic pump is connected to at least one hydraulic motor by a hydraulic circuit, the motor(s) being mechanically connected to drive the vehicle. The hydraulic circuit es...	10/27/1992
5110265	Fuel pump A fuel pump having a first pumping mechanism for pumping a fuel in a main tank to a subtank and having a second pumping mechanism for pumping the fuel in the subtank to an outside of the main tank. The fuel pump includes a rotatable impeller having a plur...	05/05/1992
5110269	Gas turbine fuel pumping apparatus A fuel pumping apparatus, particularly useful for gas turbine engines, includes a dual element positive displacement fuel pump having a centrifugal type boost stage and, downstream, at least two parallel gear type elements. A controllable means for unlock...	05/05/1992
5094597	Variable discharge pump A variable discharge pump comprises a plurality of pumping units, each pumping unit including an outlet port discharging a particular volumetric discharge of working fluid, a plurality of outlet passages respectively communicating the outlet ports of each...	03/10/1992
5064357	Fuel supply apparatus A supply passage communicates with the inlet of a first centrifugal pump. A second, smaller centrifugal pump has its outlet connected to a delivery conduit. A valve arrangement is selectively operable to connect the inlet of the second pump either to the ...	11/12/1991
5050233	Rotary compressor A rotary compressor includes first and second compressor sections, and a motor for driving the compressor sections. The first and second compressor sections have first and second cylinders, respectively, and each cylinders has a suction port. First and se...	09/17/1991
5032065	Radial piston pump A variable displacement radial piston pump includes a plurality of pump sections which are grouped into two. A first group of pump sections are communicable through a first discharge passage with a third discharge passage. A second group of pump sections ...	07/16/1991
4938666	Staged unloading of cylinder bank In a compressor having a plurality of banks of cylinders, smaller steps of unloading are achieved by unloading a single cylinder in a bank. When only one cylinder is to be unloaded, gas bypass is used in order to maintain a closer balance of forces in the...	07/03/1990
4838768	Convertible pump system A fluid pump system whose output can be varied by converting it from maximum output to a lesser output and in between by dumping or varying one of its pumping elements or pistons to the inlet side of the pump. More specifically, a pump is provided with tw...	06/13/1989
4706626	Fuel injection pump for internal combustion engines A fuel injection pump for internal combustion engines having in-line pumping elements, having pump pistons on which control slides are axially displaceable, in particular for adjusting the injection onset; in a relatively greatly displaced position, these...	11/17/1987
4651927	Plant for de-icing surfaces A plant for de-icing especially surfaces of aeroplanes, comprising the use of at least two sources (10, 12) of liquid media that are different from each other and capable of being sprayed separately or as a mixture, comprising a number of positive liquid ...	03/24/1987
4551989	Oil equalization system for refrigeration compressors A lubricant distribution system for refrigeration units having a plurality of parallel compressors which system maintains the proper level of lubricant in the compressors during operation. The system comprises compressor suction inlet lines which connect ...	11/12/1985
4527959	Drilling fluid pump providing a uniform, controlled pressure and flow rate A pump is provided for circulating drilling fluid and the like into a well during a well drilling process. The pump comprises a pair of double-ended piston assemblies hydraulically reciprocated in opposite directions by a common hydraulic drive arrangemen...	07/09/1985
4526510	Double-walled centrifugal fan scroll and system of operation A hot gas centrifugal fan is constructed with a scroll part comprising spaced-apart walls 16 and 18 to define a hot gas passage 22 therebetween to which hot gas is conveyed when the fan is in a non-operating condition to hold the fan temperature sufficien...	07/02/1985
4514147	Controlled valving for a dual pump system The control valving for a dual pump hydraulic system has two regulator valves which control the distribution of pressurized fluid, on a priority basis, to a high pressure system, a low pressure system and a lube system. One regulator valve controls flow f...	04/30/1985
4502845	Multistage gear pump and control valve arrangement There is disclosed a multistage gear pump and control valve arrangement comprising two hydraulic gear pump sets each having a suction port connected to a common sump and a discharge port for delivering hydraulic fluid to a circuit line. Only one of the di...	03/05/1985
4435134	Flow control valve A discharge flow control rate valve for a multiple cylinder type reciprocating pump has a flow rate control valve associated with two cylinders of the pump. The flow control valve has a bypass passage connecting the suction side of the pump with a stepped...	03/06/1984
4411141	Parallel operation compressor type refrigerating apparatus A parallel operation compressor type refrigerating apparatus is disclosed which has first and second compressors connected in parallel with each other by a pipe, each having the inside of its crankcase separated into a motor chamber and a compressing elem...	10/25/1983
4269352	Water pump arrangement and electric circuitry for a fountain display An arrangement of water pumps comprising two electric motor operated pumps for each of a plurality of formations of nozzles whereby the water flow from the pairs of pumps to the various formations of nozzles may be selectively controlled by pluralities of...	05/26/1981
4204811	Fluid pumping system A fluid pumping system comprises a fluid pump having multiple fluid outlet flows coupled to relatively low and high pressure loads. A control valve system controls the pressure levels of the low and high pressure flows, and relieves excess fluid from the ...	05/27/1980
4200207	Hot melt adhesive foam pump system A hot melt adhesive foam pump system having a first stage pump that meters molten hot melt adhesive into a second stage pump, which in turn mixes gas under pressure into the adhesive so that the gas is driven into solution with the adhesive at an adjustab...	04/29/1980
4183723	Rotary vane pump having multi-independent outputs due to stator surfaces of different contour A vane-type double lobe hydraulic pump having a casing with a rotor having a plurality of slots with each slot mounting a vane for tracking of a surrounding cam ring and porting for pumping from both undervane and intervane pumping chambers. The cam ring ...	01/15/1980
4179248	Oil equalization system for parallel connected hermetic helical screw compressor units A pair of helical screw rotary hermetic compressor units are connected in parallel across common suction and discharge manifolds. The discharge manifolds open to each unit casing well above the level of accumulated oil within the bottom of the hermetic ca...	12/18/1979
4177018	Apparatus for regulating the passage and flow-rate of a liquid A symmetrical, twin centrifugal pump includes a pair of valves mounted about a common shaft. The valves are capable of independent operation thus allowing either or both of the pump elements to operate. A key is also mounted to the shaft to allow overall ...	12/04/1979
4102606	Multiple displacement pump system having control sequence for unloading valve A multiple displacement pump system utilizing a single fixed displacement pump having pumping elements providing both first and second sets of pumping chambers. Circuit means having a fluid utilization conduit provides for delivery of fluid to said fluid ...	07/25/1978
4060339	Method and apparatus for controlling a gas-producing facility A method and apparatus for controlling a multiple-plant gas-producing facility which is subject to wide variations in the demand for its output. The invention is particularly applicable to an oxygen-producing facility for a steelmaking operation in which ...	11/29/1977
3953153	Multiple displacement pump system and method A multiple displacement pump system and method utilizing a single fixed displacement pump having pumping elements providing both first and second sets of pumping chambers. Circuit means having a fluid utilization conduit provides for delivery of fluid to ...	04/27/1976

PatentStorm

Quotables

PatentStorm News

Class 417/428 - Bypass control