Abstract: A target supply device according to an aspect of the present disclosure includes a tank in which a target substance in a liquid form is housed, a vibration element configured to generate a droplet of the target substance by providing, through a vibration propagation path, vibration to the target substance output through the nozzle, a first temperature adjustment mechanism configured to adjust a temperature of a refrigerant to be supplied to the vibration propagation path component to a first temperature, a temperature sensor configured to detect a temperature of the vibration propagation path, a second temperature adjustment mechanism configured to adjust, to a second temperature, the temperature of the vibration propagation path to which the refrigerant is supplied, and a control unit configured to control the second temperature adjustment mechanism based on an output from the temperature sensor.

Abstract: Embodiments provide a method and apparatus to lower the temperature and heat content of the ambient air at the inlet to a gas combustion turbine to enhance power generation. Embodiments can use multiple, staged direct contact air chillers, variable flow secondary water chilling systems, constant flow primary water chilling systems with water chilling units arranged for parallel chilled water flow, and a coolant water circulation system used for heat rejection with open cooling towers. Alternatives can use a chilled water thermal storage system, and/or waste heat to drive at least part of the water chilling process. With the included apparatus a method to allow adiabatic air chilling is available for operation during periods of lower ambient air conditions when needs for power augmentation may not be as great.

Abstract: An oil tank for a turbine engine comprising a closed enclosure having the shape of an arc of circle adapted to receive oil, with the enclosure having a lower portion and an upper portion at a distance from each other, and an oil level control device in the enclosure, wherein the oil level control device comprises a first sensor positioned in the lower portion of the enclosure so as to control the oil level, and a second sensor separate from the first sensor and positioned in the upper portion of the enclosure so as to control the oil level.

Abstract: An improved compressed air system utilizes one or more base compressors, such as fixed speed drive compressors, to meet the compressed air demands and one or more trim compressors, such as variable speed drive compressors, to meet the variations in the demand. The operation of both the base and trim compressors may be controlled to provide improved overall efficiency while meeting the transient load demands. The control may spread the demands over the various base compressors to improve the overall loading on each base compressor. Efficiency metrics may be utilized to control the switching between base and trim compressors. Unloading of a base compressor may be controlled to avoid undesirable changes in system performance.

Abstract: The invention relates to a pump assembly with a pump and with an electrical drive motor, as well as an electronic control device. The electronic control device includes a rotation direction recognition module for recognizing the correct rotation direction (CW, CCW) of the drive motor and of the pump. The rotation direction recognition module detects at least one performance characteristic value (H, Q, P) of the pump assembly, and is designed in a manner such that on rotation of the drive motor, the rotation direction recognition module detects at least one performance characteristic value (H, Q, P) and determines the correct rotation direction (CW, CCW) by way of evaluation of the performance characteristic value (H, Q, P).

Abstract: An electronic thermostat control system may include a control duty determination portion outputting PWM duty signal for controlling the coolant temperature according to a coolant temperature, a rising rate of the coolant temperature, an engine speed, a load and a vehicle speed, a driving portion applying a time condition to the PWM duty signal output by the control duty determination portion for controlling outputting interval, and a fault diagnosis portion diagnosing operations of the electronic thermostat by analyzing the signals output by the driving portion and changes of the coolant temperature.

Abstract: The present disclosure relates to a monitor for a blowout preventer of a wellbore. The blowout preventer includes a housing, rams, and an actuator comprising a cylinder with a piston. The piston is operatively connectable with the ram and movable therewith. The monitor includes a monitor base operatively connectable to the cylinder (the monitor base having an interior side inside the cylinder and an exterior side outside the cylinder), an interior plate positionable inside the cylinder about the interior side of the base (the interior plate operatively connectable to the piston and movable therewith), an exterior plate positionable outside the cylinder about the exterior surface of the monitor base (the exterior plate coupled by magnets to the interior plate and rotatable therewith), and a trigger sensor operatively connectable about the monitor base and the exterior plate to detect rotation thereof whereby a position of the ram may be determined.

Abstract: A chemical supply system comprises: a first container and a second container for storing a chemical solution; a first pump, located on a first pipe connecting the first and second containers, for directing the solution stored in the first container to the second container; and a first filter, located in the first pipe, for filtering the solution flowing through the first pipe from the first container toward the second container. The system further includes: a second pipe for connecting the first container and the second container; and a second pump, located on the second pipe, for directing the solution stored in the second container to the first container.

Abstract: A float switch apparatus for controlling the energization of multiple electric circuits in response to the level of a liquid in a vessel, and a pump system incorporating same, are provided. The apparatus has a guide structure adapted to be mounted in a fixed position relative to the vessel. A first micro-switch with a normal and an engaged position is mounted to the guide structure and is adapted to be connected into a first electric circuit to control the energization thereof. A second microswitch with a normal and an engaged position is mounted to the guide structure at a location above the first micro-switch and is adapted to be connected into a second electric circuit to control the energization thereof. A float rod is slideably mounted to the guide structure for reciprocating movement in a generally vertical direction in a zone above a resting position.

Abstract: The present invention relates to a method for determining a flow rate indicator relating to the output flow rate of one or more activated pumps of a pumping station. The pumping station includes a well to be at least partially emptied by the pumps and an inlet through which inflow can be supplied into the well. The method includes the step of determining, using a computational device, an operating condition relating to the activated pumps. The pumps are temporarily deactivated and an inflow rate indicator relating to the inflow is determined using the computational device, responsive to the determination of the operating condition. The method further includes the step of determining, using the computational device, the flow rate indicator using the determined inflow rate indicator. The present invention is equally applicable to a well to be at least partially filled by the pumps.

Abstract: The invention relates to a method for realizing a vacuum in at least one vacuum chamber. The method comprises providing an arrangement comprising a plurality of vacuum chambers, wherein each vacuum chamber is connected to a shared vacuum system. The shared vacuum system comprises a plurality of turbo molecular pumps, at least one common fore pump, and a piping system comprising one or more pipes for connecting the at least one common fore pump to each of the plurality of turbo molecular pumps. Each turbo molecular pump is separately connected to a corresponding vacuum chamber. The piping system further comprises flow regulators for controlling a flow within the piping system. The method further comprises selecting at least one vacuum chamber for pump-down, and separately pumping down the at least one selected vacuum chamber by means of the shared vacuum system.

Abstract: A fluid compression system is disclosed. The fluid compression system may include a first compressor disposed in a first fluid conduit, a first valve disposed in the first fluid conduit upstream of the first compressor, a second valve disposed in the first fluid conduit downstream of the first compressor, a second compressor in fluid communication with the first compressor and configured to selectively pump fluid from the first compressor.

Abstract: A float switch to control at least two pumps has a guide with two normally-closed micro-switches and a float rod slidably mounted thereto allowing reciprocating vertical movement. The float rod has one or more lower cam surfaces cooperating with the micro-switches to sequentially release them from their engaged positions to their normal positions during upward movement of the float rod. A float is slidably mounted to the float rod between upper and lower float stops. The shape of the lower cam surfaces is such that the weight of the float rod is insufficient to allow the float rod to move downwardly against resistance provided either by the first micro-switch or separately by the second micro-switch and the weight of the float rod combined with at least a portion of the weight of the float is sufficient to overcome either such resistance and to move the float rod downwardly.

Abstract: An electrical control system for energy efficient pump stations providing for continuous operation of a single primary pump with a second pump functioning as the support pump and a third pump acting as the standby/emergency pump. All pumps are of equal horsepower and horsepower selection is determined by the system curve to select the lowest, most efficient horsepower necessary to discharge water at the highest inflow rate while not allowing the water level to drop below the submerged pump level during continuous running of the primary pump. A timer having an indicator arm rotates one full revolution every thirty days changing the pump sequence to reduce wear and tear on individual pumps. Each pump functions as the primary, secondary and backup/emergency pump for the same number of hours during the monthly cycle. Adding control circuits enables one or more pumps to be added when necessary.

Abstract: An air compressing assembly includes an air tank disposed in a receptacle, an air blowing device disposed in the receptacle and coupled to the air tank for generating and supplying a pressurized air of a relatively lower air pressure and greater flowing quantity to the air tank, an air compressing device disposed in the receptacle for generating and supplying another pressurized air of a relatively greater air pressure and a relatively decreased flowing quantity to the air tank, and a control device coupled to the air compressing devices for controlling the air compressing devices to generate and supply different pressurized airs of different pressures and different flowing quantities to inflate different air facilities.

Abstract: Method for adjusting a compressed air installation using several electrically driven compressors of what is called the “loaded/unloaded” type and/or the turbo compressor type and/or the compressor type with variable rotational speed, wherein these compressors are each connected to a single compressed air network with their outlets, and wherein use is made of a control box which makes it possible to adjust the pressure in the compressed air network around a target pressure to be set. The adjustment takes place by controlling the flow of one or several of the compressors, in particular in order to increase the overall flow supplied by the compressors when the pressure drops too much, and in order to lower the overall supplied flow when the pressure becomes too high.

Abstract: A vehicle control apparatus includes an input member; a driving force transmission mechanism that transmits a rotational driving force of the input member to an output member; a mechanical pump that operates by using the rotational driving force of the input member; an electric pump that operates when a rotational speed of the mechanical pump is less than a predetermined operation threshold; an oil pressure control apparatus that performs control operations for the driving force transmission mechanism by supplying operating oil, which is supplied from the mechanical pump and the electric pump, to the driving force transmission mechanism; and a controller that detects a state of the electric pump.

Abstract: The present invention provides an aerial wind power generating system which has an improved structure such that despite light wind, satisfactory wind power generation can be ensured, and such that it is easy to install and remove the system, thus being effectively adapted to a temporary and portable wind power generating system. The system of the present invention includes a floating body (20), which is connected to support wires coupled to a wire rotating unit, a wind passage (30), which is formed through the floating body, so that wind passes through the wind passage in the horizontal direction, and a wind power generating unit (40), which has turbine blade assemblies and generators (48). The turbine blade assemblies are installed in the wind passage and are thus rotated by wind passing through the wind passage. The generators generate electric energy using rotating force transmitted from the turbine blade assemblies.

Abstract: An air conditioner having two compressors enables, when one compressor is started, the phase advance capacitor for the other compressor to be temporarily separated and used in parallel with the phase advance capacitor for the one compressor. These compressors can have an increased starting torque without using a starting capacitor.

Abstract: A wind power generating system is disclosed. The wind power generating system comprises a plurality of blades to capture wind energy; a shaft coupled to the plurality of blades, and a power extractor for extracting power from the rotation of the plurality of blades. A rotation of the plurality of blades occurs in response to the captured wind energy, and a lift force is generated from the captured wind energy by the plurality of blades that is substantially along the shaft.

Abstract: According to some embodiments, an airborne body extends horizontally along an axis between a first point and a second point. The body may be, for example, at least partially filled with a gas. Two or more vanes may be provided airborne with the body such that the vanes, when acted upon by a wind force perpendicular to the axis, are operable to cause rotation about the axis. Moreover, one or more tethers may be coupled to anchor the body to a third point, and one or more electrical generators may be airborne with the body to convert rotational energy produced by the rotation about the axis into electrical energy. According to some embodiments, each vane comprises a horizontal blade panel attached to and extending along the body.

Abstract: According to some embodiments, systems and methods for tethered wind turbines may be provided. In some embodiments, a system may comprise an airborne body extending horizontally along an axis between a first point and a second point, wherein the body is at least partially filled with a gas. The system may further comprise, for example, two or more vanes coupled to the body such that the vanes, when acted upon by a wind force perpendicular to the axis are operable to cause the body to rotate about the axis to generate a Magnus effect lifting force. According to some embodiments, the system may comprise one or more tethers coupled to anchor the body to a third point.

Abstract: A capacity control algorithm for a multiple compressor liquid chiller system is provided wherein the speed and number of compressors in operation are controlled in order to obtain a leaving liquid temperature setpoint. In response to an increase in the load in the chiller system, the algorithm determines if a compressor should be started and adjusts the operating speed of all operating compressors when an additional compressor is started. In response to a decrease in the load in the chiller system with multiple compressors operating, the algorithm determines if a compressor should be de-energized and adjusts the operating speed of all remaining operating compressors when a compressor is de-energized.

Abstract: An apparatus and a method for controlling oil of a multi-compressor installed in an air conditioner includes a microcomputer for sequentially stopping compressors installed in the air conditioner for a preset time and then sequentially operating the compressors when the preset time elapses; and oil pipes connected to the compressors and balancing oil in the compressors, so that damage of the compressors due to imbalance of refrigerating machine oil is prevented by uniformly dividing oil of a multi-compressor installed in the air conditioner.

Abstract: A method for optimizing the operation of several compressor units in a natural gas compression station. After a second or further compressor unit is started, the speeds of the running compressor units are set according to a fixed speed ratio in relation to characteristic data established for each compressor unit. The fixed speed ratio is altered by adjusting the rate of flow to the same percentage via the speed of rotation until the preventive pump valves of the gas compressor station are closed, whereupon the operating points of the compressor units are guided, where possible, in the characteristic data thereof, to the maximum efficiency. The optimum set speed values are determined according to continuous operating characteristics of the gas compression station by coordinated variation of the set speeds of the compressors, taking into account fuel consumption of the gas compression station. The stored fixed speed ratio is adjusted according to the optimum set speed values thus determined and stored.

Abstract: Disclosed is a method for operating a plurality of compressors of an air conditioner in accordance with a cooling or heating load in a room, in which a power supply unit for supplying power to the compressors is protected when a cooling or heating load in a room is the highest grade. The method comprises the steps of: (a) determining the cooling or heating load in the room; and (b) sequentially operating the plural compressors when it is determined as a result of the step (a) that the cooling or heating load in the room is in the highest grade.

Abstract: In a device and a method for controlling an oiled air compressor (1), which is included in a compressed-air system (2) for a motor vehicle and which is driven by the engine (3) of the motor vehicle and supplies compressed air to at least one consumer (12) in the compressed-air system (2), provision is made of, on the one hand, a control unit (14) for controlling the function of the air compressor (1) by activating the air compressor at a lower predetermined pressure level (P1) for charging the compressed-air system and deactivating the same at a higher predetermined pressure level (P2) for relieving the air compressor, and, on the other, a drainage unit (17), which in connection with the activation of the air compressor (1) drains pollutants, which have accumulated in the air compressor during the deactivation, before the air compressor is allowed to start charging the compressed-air system (2).

Abstract: A controller for managing a plurality of compressors in an efficient manner such that the system uses less energy, has lower maintenance cost and experiences less wear. For a system with multiple compressors the controller has the minimum number of compressors needed to maintain the pressure on at any given time and has no more than one compressor running in an unloaded condition for maximum efficiency. The system can quickly pressure up or down in conjunction with the needs of the system. The controller rotates the order of use of the compressors to spread the time of use and for limiting the number of times during an hour that each compressor can be turned on such that the compressors take turns running and turning on and off for even wear. The system seldom uses more than one compressor unloaded at any time.

Abstract: A compressed air production facility includes at least one variable speed compressor and a plurality of constant speed compressor, which are connected in parallel with one another. The variable speed compressor and the plurality of constant speed compressors are capacitively controlled with the use of a pressure in an air reservoir into which discharge air from these compressor are led. Both upper limit pressure at which the variable speed compressor is turned into its load operation mode into its unload operation mode and a lower limit pressure at which the variable speed compressor is turned into its unload operation mode into its load operation mode are set between an upper limit change-over pressure at which all of the plurality of constant speed compressors are turned into their load operation into their unload operation and a lower limit change-over pressure at which all of the plurality of constant speed compressors are changed over from their unload operation into their load operation.

Abstract: A method for totalizing the volume of liquid pumped to or from a vessel by a set of pumps. The method comprises the following steps: Calculating a running time for each of the pumps. Determining a first rate of change of volume when each of the pumps is turned on and a second rate of change a predetermined period after each of the pumps is turned on. Determining a draw down rate for each of the pumps and calculating the volume pumped by each pump based on the running time and draw down rate. Summing the volume pumped by each of the pumps to give a total volume pumped for the vessel over the operating time for the pumps. The totalizing method is incorporated with a control system for controlling the pumping of liquid to or from a vessel using one or more pumps. The control system comprises a level sensor, an actuator for each of the pumps, and a controller. The controller is programmed to issue control signals to the actuators and execute process steps for totalizing the volume of liquid pumped in the vessel.

Abstract: A sequential controller is provided for sequencing multiple electric loads such electric pumps. That is, for each cycle the next load is designated as the lead load in a round-robin fashion. The controller uses cost effective electro-mechanical relay logic an thus avoids conventional solid state technology. In order to sequence the loads on each successive cycle, the electro-mechanical relay connected to the sensors comprises a double-throw contact set. The double-throw contact set comprises two complementary contacts, both of which alternate between normally open and normally closed on each successive cycle. In this manner one each successive cycle, the pumps designated as the lead pump and the lag pump automatically alternate in a round-robin fashion. Further, when the lead pump is disabled the lag pump is immediately actuated without disruption of service.

Abstract: A method for identifying a surface in which a plurality of trace material is used to establish a database in which a unique combination of trace materials is assigned to a unique source. A composition is formulated containing the unique combination together with an indicator material and a solvent system, the solvent system including a solvent which is volatile under conditions of application. This composition is applied to a surface and the solvent permitted to evaporate, after which the composition is detected on the basis of the indicator material and each of the plurality of trace materials is identified. The unique source can then be determined from the database.

Abstract: A gas compressor with at least three hydraulic cylinders is connected to a source of natural gas by a gas line. The gas line can also be removably attached to a storage tank. A hydraulic system is also connected to the cylinders. The compressor additionally includes pressure controls which allow the pistons in the hydraulic cylinders to complete the compression stroke in a staged manner. The cylinders are thereby sequentially emptied of gas. Gas at a sufficient initial pressure, entering the cylinders at the completion of the compression cycle, drives the return stroke of the pistons. A pressure switch controls the pressure level of the compressed gas, and aborts the compression cycle when a predetermined pressure in the storage tank has been reached.

Abstract: When cooling power corresponding to an amount of heat generated by an electronic apparatus can be generated by either n or n+1 cooling units, n+1 cooling units are operated such that each of the cooling units keeps a sufficient margin in reserve. In this manner, even if an abnormality occurs in one of the cooling units, the operation can be continued by the n cooling units. Further, since an operation frequency of a compressor in the cooling unit can be decreased to rotate a motor in the compressor at a lower rotational speed, a speed at which a bearing is worn is slowed, whereby the useful life of the bearing can be prolonged.

Abstract: System and process are disclosed for the hierarchial control of a plurality of discrete chiller units each having individual dedicated controls. The system and process imposes limits on the amount of compression that can be demanded by the individual dedicated controls. These limits are selectively changed in response to whether a level of chilling has been collectively achieved. The selective changing of these limits is premised on examinations of each individual chiller unit including the recent history of any changes in compression by the unit.

Abstract: System and process are disclosed for the monitoring of certain parameters for the purpose of exercising supervisory control over a number of discrete chiller units each having their individual dedicated controls. The supervisory control is accomplished by imposing limits on the amount of compression that can be demanded by the individual dedicated control units. These limits are selectively changed when certain parameters pertaining to the collective chilling capacity of all of the active chiller units exceed or fall below acceptable levels.

Abstract: The present invention discloses a system for pumping a fluid into a common pressure outlet. The system contains a plurality of reciprocating pumps. A separate sensor coupled to one cylinder of each pump provides an electrical signal each time the piston in that cylinder is at a predetermined position. A speed control circuit is provided to independently adjust the speed of each pump. Manual speed control for each pump is provided through a separate throttle for each pump. A pump control circuit coupled to each of the throttles, sensors and speed control circuit controls the operation of the system. An operator determines which of the pumps to operate by closing appropriate bypass switches provided at the pump control circuit, turns on the first (master) pump and adjusts its associated throttle to operate the pump at a desired speed. The operator then turns on each of the remaining (slave) pumps.

Abstract: A control apparatus for controlling a delivery flow rate of a pump pressure-feeding process liquid within a process pipe system is described. The control apparatus has detecting means for detecting available N.P.S.H. of a pump on the basis of a pressure and a temperature of the process liquid within the suction portion of the pump, and calculating means for calculating an allowable maximum flow rate of the pump so as to hold the relationship: available N.P.S.H. required N.P.S.H. The control apparatus also has outputting means for outputting a control signal to control the delivery flow rate of the pump on the basis of the smaller value, the allowable maximum flow rate or a required flow rate of the pump.

Abstract: A scroll type compressor having a pair of scroll type compression units which are encased in the same casing so as to make a common use of a lubricating oil reservoir provided in the casing, wherein the compression units have compression elements, drive shafts, driving motors and other components which are of the same constructions and specifications, and wherein each of the compression units are adapted to be driven selectively by commercial electrical power or through a frequency-variable inverter so as to operate at different speeds. Since both compression units can be made up from the same components such as the compression elements, loads in the production, service and administration, are greatly reduced contributing to a reduction in the labor and cost, while eliminating any mounting error.

Abstract: A sewage pumping system includes a container, an inlet for the inflow of liquid and a modality for ascertaining the liquid level in the container. Two or more pumps are provided, each having an inlet communicating with a container and an outlet communicating with the common conduit. A pump controller receives information from the modality for ascertaining the liquid level and is adapted to start and stop individual pumps. A pressure sensing device is located in the conduit for sensing the backpressure against which pumps in operation are pumping, and for generating a second signal corresponding to the sensed backpressure, the signal going to the pump controller. An addressable memory is operatively connected with the pump controller and stores values corresponding to pumping rates vs. backpressure for each of the pumps, along with high and low backpressure values for each pump. On high backpressure the pump controller avoids pumpstarts which will not result in a net increase in the total pumping rate.

Abstract: A time delay and alarm system is provided to ensure safe operation of periodically activated apparatus having potentially dangerous moving parts. The system preferably employs a 555 type integrated timer circuit, a horn, and a pulse generator which causes the horn to produce a cyclical sound.

Abstract: A capacity controllable compressor apparatus has a plurality of high-pressure chamber compressors which are connected in parallel to a common refrigerant suction pipe and a common refrigerant discharge pipe, and oil equalizing pipes through which oil sumps of the plurality of compressors are communicated with each other. One of the plurality of compressors is operated with its chamber kept at a higher internal pressure than other compressors.

Abstract: Storm water pumps drain storm water in a pump well. In order to control the storm water pumps, a radar rain gage and ground raingages are set. Measurement data from the radar rain gage and the ground rain gages are supplied to a data processing unit. The data processing unit calibrates rainfall distribution data representing a two-dimensional rainfall distribtuion state obtained by the radar rain gate by the measurement data from the ground rain gages, and forecasts a rainfall in a predetermined time from the present from several sets of the calibrated rainfall distribution data. The data processing unit performs runoff analysis corresponding to characteristics of a drainage basin on the basis of the forecast rainfall to calculate a rainfall flow, thereby forecasting a flow of storm water flowing in the pump well.

Abstract: A method and apparatus for controlling the capacity of a multi-stage cooling system is disclosed. The system of the invention utilizes a plurality of commonly piped compressors having common suction load wherein at least one compressor being a variable speed compressor, means for establishing a single predetermined cooling stage "cut-in" pressure and a single predetermined cooling stage "cut-out" pressure, a plurality of condenser fans and a microprocessor based control means for controlling the operation of the system.

Abstract: Connected to a pressure conduit are a plurality of fixed displacement pumps and a variable displacement pump which are connectable and disconnectable in accordance with the amount of fluid withdrawn. The maximum delivery rate of the variable displacement is greater than the delivery rate of each fixed displacement pump. For the minimum and maximum delivery rate of the variable displacement pump two switching points are defined at each of which a fixed displacement pump is connected or disconnected. This gives a reliable fluid supply of the pressure conduit without any danger of erroneous switchings.

Abstract: A multiple pump supply system having multiple pumps placed in parallel and having a plurality of reservoirs connected to acommon discharge line. The pumps are operated sequentially on demand sensed by a pressure sensor located at the mouth of the first reservoir and controlling a first pump. Multiple sensors located at the mouth of a second reservoir control the subsequent pumps sequentially.

Abstract: A control system for controlling a closed-loop refrigeration system having multiple parallel commonly piped compressors is disclosed. Various combinations of compressors define the compressor capacity stages of the system. The disclosed control system responds to a system parameter, such as the suction line pressure or the temperature of an area to be cooled by an evaporator of the refrigeration system, to control the selection of the minimum system compressor capacity necessary to maintain the temperature of the area to be cooled to the lowest temperature. Control of the compressor capacity is effected by the sensed system parameter by generating an operating range defined from an upper to a lower operating limit. Operations above or below this range determines whether an increase or decrease, respectively, in compressor capacity needs to be made.

Abstract: A packaged hydro-pneumatic pumpset system in which a plurality of pumps JI, M2, M3 are brought into operation sequentially as water pressure in the system drops below pre-set values. The system includes an accumulator 6 for storing water to maintain pressure in the system when the pumps are not operating and a prime is maintained on the pumps by means of a footvalve in the suction pipe inlet. The system also includes a second accumulator 9, which is connected to the first and which is arranged, when the pumps are inoperative, to maintain a reservoir of stored pressurized water in the suction manifold.

Abstract: An air supply and control apparatus for an inflatable mattress 2 has several air compressors 1 which are operated in turn, during normal operation, to inflate the mattress 2. In the case of the pressure in the mattress 2 falling below an upper preset value the air supply is provided by having more than one air compressor 1 operate simultaneously. The apparatus has electronic circuitry for effecting this alteration of the mode of operation when pressure sensing means 4 detects a fall in mattress pressure. In the case of a more severe drop in mattress pressure a valve 16 in an air outlet of the mattress 2 is closed under control of the electronic circuitry. The apparatus is particularly suitable for use with a mattress 2 having a plurality of separately inflatable regions, air being supplied to the regions from the air compressors 1 via a distributor 3.

Abstract: An easily viewed control panel structure indicating the status of and controlling the operation of a water, wastewater or process liquid pumping station where the pumping equipment is operated automatically with respect to a varying liquid level or pressure, liquid level is sensed over a calibrated range, the sensed level information is sent to a controller as a proportional signal, the value of the level of pressure information is displayed on a multi-element, vertically-oriented light-emitting diode bar graph display with each element representing a uniform increment of the total level or pressure range, a circuit-connecting programming pin is inserted in each of several vertically positioned receptacles of the control panel with each such insertion at each horizontal level representing a segment of the level display bar graph, with each receptacle representing a turn-ON or turn-OFF capability of the controller and with two such receptacle circuits combining to provide differential level automatic control o