An apparatus, system and method for regulating fluid flow are disclosed. The apparatus includes a flow rate sensor and a valve. The flow rate sensor uses images to estimate flow through a drip chamber and then controls the valve based on the estimated flow rate. The valve comprises a rigid housing disposed around the tube in which fluid flow is being controlled. Increasing the pressure in the housing controls the size of the lumen within the tube by deforming the tube, therefore controlling flow through the tube.

An apparatus, system and method for regulating fluid flow are disclosed. The apparatus includes a flow rate sensor and a valve. The flow rate sensor uses images to estimate flow through a drip chamber and then controls the valve based on the estimated flow rate. The valve comprises a rigid housing disposed around the tube in which fluid flow is being controlled. Increasing the pressure in the housing controls the size of the lumen within the tube by deforming the tube, therefore controlling flow through the tube.

A pump includes a vibrating plate, a flow path forming member, a pump chamber, and a film valve. The vibrating plate is provided with a piezoelectric element, vibrates due to distortion of the piezoelectric element, and has a gap on an outer periphery. The flow path forming member is disposed so as to face the vibrating plate, and has a hole in a portion facing the vibrating plate. The pump chamber is surrounded by the vibrating plate and the flow path forming member, and has a central space communicating with the hole and an outer edge space communicating with the gap. The film valve is disposed in the pump chamber. The film valve is in contact with the vibrating plate and the flow path forming member when a pressure in the central space is lower than a pressure in the outer edge space.

A manifold can determine a turnover scheme including a target turnover schedule of target turnover levels, based on an operation schedule and efficiency setting for a fluid distribution. Each target turnover level can correspond to a volume of fluid to be cycled through the fluid distribution system over a period of time. The manifold can operate respective valves and a supply device based on a target turnover level and determine a current turnover level from a flowrate detected by a flow sensor for at least one of the valves. The manifold can receive a current usage of the fluid distribution system and determine a required turnover level. An override status for the turnover scheme can be based on the efficiency setting and a comparison of the current, target, and the required turnover levels, and the manifold can operate respective valves and the supply device based on the override status.

A manifold can determine a turnover scheme including a target turnover schedule of target turnover levels, based on an operation schedule and efficiency setting for a fluid distribution. Each target turnover level can correspond to a volume of fluid to be cycled through the fluid distribution system over a period of time. The manifold can operate respective valves and a supply device based on a target turnover level and determine a current turnover level from a flowrate detected by a flow sensor for at least one of the valves. The manifold can receive a current usage of the fluid distribution system and determine a required turnover level. An override status for the turnover scheme can be based on the efficiency setting and a comparison of the current, target, and the required turnover levels, and the manifold can operate respective valves and the supply device based on the override status.

An acoustic device may include a housing; an acoustic channel for passing sound through the housing; a valve seat arranged in the acoustic channel; a valve member configured to control the passing of sound through the channel depending on a configuration of the valve member with respect to the valve seat; an actuator comprising a first SMA wire section and a second SMA wire section configured to actuate the valve member and to change a configuration of the valve member with respect to the valve seat from an open configuration to a closed configuration and vice versa, respectively, when activated; and a retention mechanism which is configured to provide a retention force for retaining the valve member in the closed configuration, wherein the retention force is configured to be overcome by the actuator such that the valve member is released from the closed configuration upon activation of the actuator.

An actuator of an environmental control system of a building including a motor and a drive device driven by the motor and configured to drive a valve within a range of positions. The actuator includes one or more printed circuit boards including one or more processing circuits configured to obtain a raw measurement data set from transducers and generate a flow signal based on the raw measurement data set. The flow signal indicates a flow rate of a fluid through a conduit. The one or more processing circuits are configured to determine an actuator position setpoint based on a flow rate setpoint and the flow signal and operate the motor to drive the drive device to the actuator position setpoint. The motor, the drive device, and the one or more printed circuit boards are located within a common device chassis.

A portable electronic device comprising: an enclosure having an enclosure wall that forms an interior chamber and a sound output port to an ambient environment; a transducer positioned within the interior chamber and dividing the interior chamber into a front volume chamber coupling a first side of the transducer to the sound output port and a back volume chamber coupled to a second side of the transducer; and an electromechanical valve comprising a number of flaps operable to open and close a vent to the interior chamber, the front volume chamber or the back volume chamber.

A control device for providing a position controller mode for closed-loop position control of an actuator member of a fluidic actuator which can be driven by a pressurized fluid, wherein the control device is configured to activate a pressure controller mode in response to the actuator member being located in a position target range given by a target position value of the closed-loop position control, and, in the pressure controller mode, to carry out a closed-loop pressure control of the pressurized fluid on the basis of a target pressure value.

A control device for providing a position controller mode for closed-loop position control of an actuator member of a fluidic actuator which can be driven by a pressurized fluid, wherein the control device is configured to activate a pressure controller mode in response to the actuator member being located in a position target range given by a target position value of the closed-loop position control, and, in the pressure controller mode, to carry out a closed-loop pressure control of the pressurized fluid on the basis of a target pressure value.