A compression system includes a compressor that compresses a synthesis gas to produce a compressed gas, a first line that supplies a first gas constituting the synthesis gas to the compressor, a second line that supplies a second gas constituting the synthesis gas to the first line, a discharge line that circulates the compressed gas, a recirculation line that recirculates a part of the compressed gas from the discharge line to the first line, a first regulating valve arranged in the first line, a second regulating valve arranged in the second line, a discharge valve arranged in the discharge line, a recirculation valve arranged in the recirculation line, and a valve control device that performs switching between the first regulating valve, the second regulating valve, the discharge valve, and the recirculation valve based on an operation condition of the compressor.

The present disclosure relates to electronically-controlled air assemblies having an inflation, a deflation, and a closed state for use with inflatable products, such as air mattresses. Specifically, the present disclosure relates to air assemblies where the configuration of the air assembly can be changed by a user operating a directional control valve to inflate, deflate, or close an inflatable product. The air assembly may also maintain a predetermined air pressure value within the inflatable product.

A concealed office fan lamp is provided, which includes a stop device, a support and a fan blade. A lamp is arranged at the bottom of the support, a cavity is arranged in the support, the fan blade is electrically connected with a driving mechanism to make it rotatably arranged in the cavity, and the stop device is arranged on the support and/or the fan blade to detect the motion state of the fan blade. According to the motion state, the fan blade is stopped and hidden in the cavity. By providing a stop device on the fan lamp, the fan blade can be accurately stopped and hidden in the cavity, the person under the fan lamp cannot see the fan blade when the fan lamp stops working, making the fan lamp more beautiful as a whole.

The present invention relates to a sealing system for a pump configured to pressurize a volatile liquid, such as liquid ammonia. The sealing system (2) includes a stuffing box (35) forming a barrier chamber (30) and a pump-side seal chamber (43), a mechanical seal (20) arranged in the barrier chamber (30), and a barrier-gas supply system (32) for supplying a barrier gas into the barrier chamber (30). The barrier gas has a pressure higher than a pressure of the volatile liquid in the pump-side seal chamber (43). The pump-side seal chamber (43) is located between an impeller (7) of the pump (1) and the mechanical seal (20). The barrier-gas supply system (32) includes a pressure control valve (50) configured to maintain a constant difference between pressure in the barrier chamber (30) and pressure in the pump-side seal chamber (43).

The water-conserving liquid ring vacuum pump system receives the output from a water ring vacuum pump, removes the air and contaminants from the water, and returns the clean water to the make-up water port on the pump, thereby saving most of the water that would normally be discarded. Friction in the pump also heats the water, so the system is designed to cool the water as well.

An electronic device includes proximity sensor, a memory and a processor. The proximity sensor is positioned within an enclosure of the electronic proximate to one or more air vents. The proximity sensor generates a sensing signal to detect blockage of the one or more air vents. Based on a response to the sensing signal, the proximity sensor generates an output signal indicating that one or more air vents is blocked. The processor is configured to execute computer-readable instructions stored in memory to receive the output signal from the proximity sensor indicating blockage of the one or more air vents is detected, and, in response to receiving the output signal from the proximity sensor indicating blockage of the one or more air vents is detected, forward, to one of a network device, a user device, and a service provider, a notification of the blockage of the one or more air vents.

A motor drive control device 1 includes a drive voltage generation circuit 13 configured to generate a drive voltage Vin based on a first supply voltage Vdc inputted to a first terminal P1 and generate the drive voltage Vin based on a second supply voltage inputted to a second terminal P2 when a supply of the first supply voltage Vdc is stopped, a control circuit 21 configured to be operable by the drive voltage Vin, generate a drive control signal Sd based on a drive command signal Sc, generate a motor driving information signal So and output the motor driving information signal So from a third terminal P3 and a motor drive circuit 10 configured to output a drive signal to the motor 3, in which the control circuit 21 monitors the first supply voltage Vdc and outputs history information 300 relating to operation of the motor 3 from the third terminal P3 as the motor driving information signal So upon detecting that the supply of the first supply voltage Vdc is stopped.

A cooling fan monitoring circuit for monitoring and immediately alerting the user of the activation of a cooling fan motor and blade assembly providing notice of the shutting down of equipment requiring cooling to prevent overheating and damage to the equipment. The circuit is capable of monitoring multiple cooling fans and shuts down equipment if any one of the cooling fans ceases function, fails a preset condition, or the equipment reaches a preset temperature.

A cabin blower for an aircraft, the system comprising: a cabin blower compressor; an electric machine; and a controller configured to control the cabin blower system so that: in a cabin blower mode of operation, the cabin blower compressor is driven by power extracted from one or more spools of a gas turbine engine of the aircraft and provides a flow of air to a cabin of the aircraft. The controller may be further configured to control the system so that: in a rotor bow mitigation mode of operation, the cabin blower compressor is driven by the electric machine using electrical power from an electrical power source and provides a flow of air through a core of the gas turbine engine to remove heat from the core. A method of operating a cabin blower system of an aircraft is also provided.

Automatic testing for control valves is provided for diagnosing of actuators, including actuators not equipped with analog or discrete position transmitters. A valve controller confirms steady-state conditions for a turbo-compressor system that includes a control valve in a first position and sends, to an actuator for the control valve, a signal to initiate a partial valve stroke to move the control valve away from the first position. The valve controller receives feedback signals from sensors in the turbo-compressor system and monitors the feedback signals for a change from the steady-state conditions. When the monitoring detects a change from the steady-state conditions within a defined time period, the valve controller sends, to the actuator, a signal to return the control valve to the first position. When the monitoring does not detect a change from the steady-state conditions within the defined time period, the valve controller generates an alarm signal.