Abstract: An air release and pump primer attachable to a swimming pool pump is configured to permit the manual release of air trapped inside a pool pump while permitting the pump to be manually primed with fluid.

Abstract: A diagnostic monitoring system and method is employed for one or more vapor compression systems such as air conditioners and heat pumps having a compressor, an indoor air handler fan coil and an outdoor condensor. Temperature, voltage and current sensors are provided at the outdoor condensor to determine that at least one vapor compression system is operating properly. Data obtained from the sensors is wirelessly transmitted to a receiving-device for use by the systems' custodian or repair service provider and includes information concerning an occurrence of periods when one or more of the vapor compression systems are operating at an abnormal state.

Abstract: A method and a control arrangement are disclosed to measure a total flow rate through a pump device before a pump pressure or rotational speed change; and to change at least one of: the pump pressure by a predetermined pressure step or the pump rotational speed by a predetermined rotational speed step. The arrangement can measure a total flow rate through the pump device after the pump pressure or rotational speed change; and determine a need for a further pump pressure or rotational speed change step based on total flow rate measurements carried out before and after the pump pressure change.

Abstract: A pump control system includes a source of pressurized fluid an output valve adjustably controls the flow of pressurized fluid from the source. An output valve control is coupled to the output valve and monitors the actual state of the output valve. The control selectably adjusts the output valve in response to a first control signal. A controller is coupled to the output valve control, the controller receiving information from the output valve control corresponding to the actual state of the output valve and providing to the output valve control the first control signal, the first control signal being applied to the output valve to achieve and maintain a desired state.

Abstract: Device for adjusting the operating pressure of an oil-injected compressor installation with a compressor element (2) driven by a motor (4) with an adjustable rotational speed and a control module (13), whereby the device (15) is provided with a controlled inlet valve (16) which is connected to the air inlet (5) and a blow-off mechanism (17) which can be closed by means of a blow-off valve (19), wherein the inlet valve (16), the blow-off valve (19) and the control module (13) are electrically controllable components which are connected to an electronic control unit (22) for adjusting the operating pressure (Pw), which is measured by an operating pressure sensor (23).

Abstract: A control method and apparatus for simultaneously protecting a compression system from driver overpowering and turbocompressor surge. When overpowering is detected, flow rate through the each compressor in the turbocompressor train is reduced by closing an inlet throttling valve at the inlet of each respective compressor stage unless a compressor operating point is sufficiently near surge. In this latter case, the inlet throttling valve is not closed. In this way, overall flow rate through the compressor train is reduced while maintaining adequate flow through compromised stages to avoid surge.

Abstract: A system for supervising the speed of at least one engine of an aircraft includes three independent information sources determining first, second and third values for an aerodynamic parameter of the aircraft and precision information indicating the precision of these values. A control unit acts on the operation of the engine, and a sensor measures a fourth value for the parameter. An arithmetic unit selects a control value by using the first, second, third and fourth values of the aerodynamic parameter and the precision information and uses the control value to determine a control sequence for the control unit. An information transmission network, to which the three independent information sources and the arithmetic unit are connected, permits a transmission of information between the sources of information and the arithmetic unit.

Abstract: A fuel delivery system supplies fuel to a turbogenerator or to another heat engine. A fuel delivery system according to the present disclosure may include a fuel compressor, a fuel control valve, and a fuel flow controller. A fuel delivery system may have multiple modes of control permitting independent and simultaneous control by the compressor and the fuel valve. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Abstract: Flow parameters in a fluid delivery assembly are determined by monitoring pressure responses and processing those responses along with information regarding the fluid flow. In one aspect, a processor controls the pump to pump flow quantities in accordance with a pseudorandom code. Portions of the resulting pressure signal sensed at the conduit is averaged, and the averaged values are then decoded in accordance with the pseudorandom code. An estimate of the equilibrium pressure is generated from the decoded average pressure values, while a summation of the pressure samples is generated from the undecoded pressure signals. The resistance to fluid flow of the system is determined from the estimated equilibrium pressure and pressure summation. For low flow rates, a processor controls the pump to pump fluid in a series of fluid boluses, with each fluid bolus delivered in the beginning of a separate timeslot.

Abstract: A method for controlling compressor discharge pressure in a compressor. The compressor comprising a compression module driven by a prime mover, the compression module having a discharge port through which a compressed fluid is discharged with a discharge pressure, and an inlet through which uncompressed fluid is flowed into the compression chamber, the flow of fluid through the inlet controlled by an inlet valve repositionable by an actuator driven by a motor. The method comprising the steps of running a discharge pressure control routine, comprising the steps of: calculating the difference between the actual discharge pressure and a predetermined setpoint discharge pressure; computing the required change in valve position to achieve the setpoint discharge pressure, the period of time the motor means must be energized to produce the change in valve position, and the direction the valve must be moved to produce the setpoint discharge pressure.

Abstract: A calibration apparatus and method for calibrating a hydraulic control valve connected to an electronic controller. The electronic controller selects control signals and reads corresponding hydraulic pressure outputs of the hydraulic control valve and selectively records values corresponding to control signals that produce desired calibration pressures.

Abstract: In a frost-free water supply system that drains down to avoid freezing, during non-pumping periods, operation of the system is responsive to pressure changes within the system. A pneumatic relay sensitive to changes in one of the fluid pressures operative in the system is located in a portion of the system subject both to water pressure and to the air pressure operating in the system, to provide a pneumatic signal that activates or de-activates one or more system components. One arrangement has a water line discharging into an animal watering bowl within a protected environment. The pneumatic relay is in pressure sensing relation with a localized portion of the water line that remains undrained when the major length of the hose is drained. The pneumatic relay subsequently senses a drop in water pressure, responsive to the re-filling of the bowl. The pneumatic relay is connected to a distant relay, to switch on the pump and recharge the water line, to re-supply the bowl.

Abstract: Protective apparatus in a scroll compressor, in the form of a valve assembly, is operative to prevent compressor damage from reverse direction rotation of the scroll compression mechanism or the development of abnormally high discharge gas temperatures. The valve assembly is disposed in a passage communicating between the suction and discharge pressure portions of the compressor shell and houses a discharge temperature sensor immediately adjacent the location from which discharge gas issues from the compression mechanism. The location of the sensor and its exposure to discharge gas permits the timely sensing of abnormally high discharge temperatures and the shutdown of the compressor upon their occurrence.

Abstract: A well pump system having a motor-driven pump and a pressure tank for delivering water from a source to a utilization point. A sensing device detects a parameter correlated to the rate of flow into and out of the pressure tank. The parameter is utilized to regulate flow into the tank so as to establish at least approximate equality between flow into and out of the tank.

Abstract: A method of starting a variable-speed pump turbine or a variable-speed pump driven by a variable-speed generator motor or a variable-speed motor connected to an electric power line in parallel therewith. The generator motor or the motor is first operated at low speed with the guide vanes or the delivery valve fully closed. The low speed is lower than a stable starting speed of the pump turbine or the motor but high enough to prevent backward flow of water into the pump turbine or the pump. After the operation is set at the low speed, the guide vanes or the delivery valve are opened and the opening degree is gradually opened until the speed is increased to a speed optimum for the steady operating condition of the pump turbine or pump. This method effectively suppresses abrupt increase in the pump input power required for the driving of the pump turbine or the pump, whereby unfavorable effect on the electric power line is avoided advantageously.

Abstract: A compressor having a starting load reducing apparatus comprises a main compressor body for compressing gas obtained under suction from an intake chamber through an intake valve within a compression chamber, and ejecting the compressed gas through an outlet opening, a motor for driving the main compressor body, a switch for starting the motor by closing, a solenoid mechanism operated by the closing of the switch, for forcibly communicating the compression chamber with the intake chamber, to put the main compressor body into a non-compressing operational state, and a positive thermally sensitive resistor element connected at a stage before a coil of the solenoid mechanism. The solenoid mechanism operates after the switch is closed until the time when the resistance of the positive thermally sensitive resistor element reaches a predetermined resistance.

Abstract: An oil cooled compressor including a compressor member driven by a motor, an oil tank receiving oil therein and removing oil from the gas discharging out of the compressor member, an oil supplying device for supplying the oil in the oil tank into the compressor member, and a pressure responsive control device for controlling the operation of the compressor member. There are provided a first temperature detector detecting the temperature of the oil, a second temperature detector detecting the temperature of the gas, and a temperature responsive control device restricting the function of the pressure responsive control device in response to the temperatures detected by the first and second temperature detectors.

Abstract: A water supplying system has a pneumatic tank storing water and confining compressed air therein. The pneumatic tank is adapted to be charged with water by a pump. The supply of compressed air into the pneumatic tank is controlled in such a manner as to maintain a constant amount of compressed air in the pneumatic tank. A pressure-responsive device is attached to a water service pipe through which the water is discharged from the pneumatic tank and delivered to faucets or the like. The pressure-responsive device has a pressure-responsive valve adapted to break the communication between the pneumatic tank and the water service pipe when the water level in the pneumatic tank has come down near the port of the tank connected to the water service pipe, and a pressure switch adapted to control the operation of the motor for driving the pump in relation to the operation of said pressure-responsive valve.

Abstract: A multiple pumping chamber pump in which the pressures in at least two of said chambers are equal for at least a portion of their pumping cycles, maintains a constant flow of pumped material by utilizing control means that selectively and continually replaces one material pumping chamber with another after the pressures in both of said chambers have equalized and after the outputs of said chambers have been connected to a common output conduit, by gradually and simultaneously causing a decrease in the pumping rate of material from one of said compression chambers and, to the same extent, a corresponding increase in the pumping rate of material from another of said chambers until the material pumping rate from one of said chambers is reduced from its normal pumping rate to zero and the pumping rate from the other of said chambers has been increased to the said normal pumping rate from the said chamber that had its flow rate reduced to zero.

Abstract: A system for safely and efficiently collecting vapors which might otherwise be released during the storage or transfer of a volatile liquid to and from a storage facility. The system includes a collapsible walled receptacle or reservoir which is connected to receive vapors from the storage facility. A compressor or other vapor evacuation means is also connected to the storage tank as well as to the collapsible walled receptacle. The compressor functions intermittently to remove vapors from both units. The collapsible walled unit includes a level sensing means which is adapted to in effect, sense the volume of vapor held within the collapsible walled receptacle and thus to actuate the compressor control means between predetermined levels.

Abstract: In a container of the kind having a rigid impermeable base and a flexible impermeable cover which is sealed to the base, and in which air is evacuated from the region between the cover and the base so that the cover is drawn down onto goods on the base, there is provided a bellows-type vacuum sensor which senses the air pressure in the container and which operates switch contacts controlling a pump. When the container is used in an aircraft, where the ambient pressure inside the aircraft falls considerably when the aircraft is at high altitudes, the pump is actuated to ensure that the pressure in the container is maintained below the ambient pressure in the aircraft. An excess pressure difference, which might overload shock absorbing mounts for goods on the container base, is prevented by the bellows opening relief air ports.

Abstract: A method is disclosed for a cascade control of a dynamic compressor to maintain a constant mass flow rate to a process. The method consists of a successive junction of control loops for controlling the speed of rotation, the pressure in the delivery, and the mass flow rate; the output signal of each outer loop being the input signal for the inner loop and each of the loops containing a compensating element to reduce the effects of large time constants of all previous loops.An automatic control system based on using the above method, distinguished by its great static and dynamic precision in maintaining a controlled parameter, and by the high reliability of protection of the compressor from surge, and protection from a dangerous increase of the speed of rotation and of a dangerous increase of the discharge pressure.

Abstract: A safety control system for a pump and anti-surge valve protects the pump, the valve and the hydraulic main line system. The valve is controlled by a pressure responsive circuit and, via a limit switch on the valve, controls both the steady state running of the pump and the pump start. A timed start circuit allows pressure to build up sufficiently to operate the valve upon initiation of pump operation. The system automatically shuts down upon power, mechanical or hydraulic failure, and prevents continued operation of the pump control valve when the pump has lost suction or there is a decrease in pump discharge pressure.

Abstract: A pump check valve control apparatus includes a pump for delivering a fluid to a system. A valve between the pump and the system controls the delivery of the fluid to the system. A valve actuator, signalled by an actuator control, begins to open the valve when the pressure on the pump side of the valve substantially equals the system pressure. During the opening cycle of the valve, a substantially constant pressure is maintained in the system. The actuator control closes the valve so that flow through the valve ceases when the pressure differential across the valve is substantially zero.