A cordless compressor has an air storage tank, a pump, a motor for driving the pump, and a controller circuit electrically connected to the motor. A pressure switch assembly is connected to the controller circuit. The pressure switch assembly has first and second pressure switches for sensing pressure within the air storage tank. The controller circuit controls de-activation of the motor depending upon status of the first and second pressure switches.

A fire suppression system includes a motor and a foam pump. The foam pump is driven by the motor to inject one or more chemical additives from an off-board additive container into a discharge conduit. A bypass valve is in fluid communication with the output of the foam pump. One or more sensors are configured to measure at least one operating condition of the foam pump. A controller is in communication with the one or more sensors and is operatively connected to the bypass valve. The controller is configured to determine, based on data received from the one or more sensors regarding the at least one operating condition of the foam pump, whether the foam pump is experiencing a loss of prime, and to open the bypass valve in response. The motor may also selectively operate in one of two modes depending on the rotational speed and torque required.

An air compressor includes a cylinder and a piston reciprocably movable inside the cylinder, an electric motor configured to drive the pump, and a pressure switch, including a push-button for activating and deactivating the pressure switch, movable between first and second operating positions. A housing covers the pump electric motor and pressure switch. A switch, coupled to the housing and movable between first and second operating positions is configured to move the push-button such that when the switch is in the first operating position, the push-button is in the respective first position and, when the switch is in the second operating position, the push-button is free to switch between the first and the second position.

A lubrication system for an internal combustion engine includes a fluid flow control device at the outlet side of the pump that regulates pressure conditions at the outlet side of the pump upstream of the lubrication circuit in the engine. The fluid flow control device includes a chamber that is opened in response a fluid pressure exceeding a threshold to allow the fluid to pass from the outlet side of the pump back to the inlet side of the pump. The fluid flow control device also includes at least one elongated aperture in communication with the chamber for receiving fluid fed from the chamber and allowing the fluid in the chamber to flow to the inlet side of the pump.

Disclosed is a method for managing a piston pump using a computer of a vehicle, the pump including a guide, a piston slidably mounted in the guide, and a solenoid, suitable for moving the piston, the method including, as long as the fuel pressure in the compression chamber of the pump is below a predetermined pressure threshold, a step of the computer controlling the solenoid in order to move the piston to its high position, and a step of the computer detecting that the predetermined pressure threshold has been exceeded when the current value, measured after a predetermined period, is greater than or equal to a predetermined reference value so that the computer ceases to control the solenoid.

Method for controlling a compressed air unit which consists of several compressed air networks (2 and 3) having at least one commonly controllable component, characterized in that, on the basis of measurement data of at least one of the above-mentioned compressed air networks (2 and 3), at least the above-mentioned common component (11) is controlled by at least one controller (20).

A method and a device for compensating leakage losses in a line system, in which at least one positive displacement pump and at least one shut-off member are provided, wherein the method and device can be used for the isobaric metering of liquid plastic components and wherein the actual liquid pressure in the system is determined by way of a pressure measuring device and, when the shut-off member is closed is regulated to a pressure target value by actuation of the positive displacement pump, wherein the conveying loss rate of the positive displacement pump, which ensues to maintain the pressure target value when the shut-off member is closed is added to a target delivery rate in order to compensate for the leakage loss occurring at the corresponding pressure target value.

The present disclosure provides an air pump device, including a housing; a high-pressure air pump, a low-pressure air pump and a public pipeline are arranged in the shell; the high-pressure air pump is a reciprocating air pump, and includes a motor, a piston tube and a piston; the piston is arranged in the piston tube; the motor is used for driving the piston to move in the piston tube; an output shaft of the motor is perpendicular to an axial direction of the piston tube; an air outlet end of the piston tube is connected with the public pipeline, and the piston tube and the public pipeline are parallel or located on the same straight line; the low-pressure air pump is a blowing-type air pump, and includes a shell and a fan assembly.

An operational control device is disclosed for a positive-displacement pump having a motor, means for actuating the motor, state sensor means for detecting an actual operating parameter (e.g., pressure) of the pump, and operating mode means for controlling an operating mode of the pump. A first actuating mode of the operating mode means is set by the actuating means below a first operating-parameter threshold value (P1). This mode brings about a constantly rising pump pressure in the direction of an operating-parameter setpoint value (Pset) in a variable manner, which is dependent on a detected change in the operating parameter over a predefined time interval. A second actuating mode is set as normal operation to the operating-parameter setpoint value by the actuating means above the first operating-parameter threshold value. P1 is fixed or is calculated as a fraction of the operating-parameter setpoint value and/or a pump parameter correlated therewith.

A battery powered fluid sprayer includes a reciprocating positive displacement pump, a power supply that includes a battery, an electric motor, a motor controller, a user-adjustment mechanism for setting a user-adjustable pressure threshold corresponding to system fluid pressure of the battery powered fluid sprayer, a pressure switch, and a power controller. The pressure switch generates a pressure signal indicative of whether the system fluid pressure is greater than the user-adjustable pressure threshold. The power controller is configured to control power of the battery powered fluid sprayer by providing operating power of the motor controller in response to the pressure signal indicating that the system fluid pressure is less than the user-adjustable pressure threshold, and not providing the operating power of the motor controller in response to the pressure signal indicating that the system fluid pressure is greater than the user-adjustable pressure threshold.