A flow heater for new forms of vehicles. The flow heater comprises a passageway for liquid, a heating source, a swing mechanism arranged in the passageway, and a sensor for detecting a position of the swing mechanism. In some embodiments, the swing mechanism includes a flap and a stopper wherein the flap is hinged to an inner wall and the stopper is fixed to an inner wall and located to abut the flap in the absence of flow.

A flow heater for new forms of vehicles. The flow heater comprises a passageway for liquid, a heating source, a swing mechanism arranged in the passageway, and a sensor for detecting a position of the swing mechanism. In some embodiments, the swing mechanism includes a flap and a stopper wherein the flap is hinged to an inner wall and the stopper is fixed to an inner wall and located to abut the flap in the absence of flow.

A safety device is disclosed for a power transformer containing a cooling liquid, and can include a shaped body having an inner chamber which is suitable to be at least partially immersed in cooling liquid and inside which gas can accumulate; a first floating element and a second floating element suitable to be at least partially immersed in and moved by cooling liquid; and a switch suitable to be actuated by the first floating element when the gas accumulated is such that the level of the cooling liquid in the inner chamber reaches a predetermined first threshold level and by the second floating element when the gas accumulated is such that the level of the cooling liquid in the inner chamber reaches a lower predetermined second threshold level, respectively. The first and second floating elements can be mounted on and move linearly relative to one or more corresponding guiding supports.

A safety device is disclosed for a power transformer containing a cooling liquid, and can include a shaped body having an inner chamber which is suitable to be at least partially immersed in cooling liquid and inside which gas can accumulate; a first floating element and a second floating element suitable to be at least partially immersed in and moved by cooling liquid; and a switch suitable to be actuated by the first floating element when the gas accumulated is such that the level of the cooling liquid in the inner chamber reaches a predetermined first threshold level and by the second floating element when the gas accumulated is such that the level of the cooling liquid in the inner chamber reaches a lower predetermined second threshold level, respectively. The first and second floating elements can be mounted on and move linearly relative to one or more corresponding guiding supports.

Systems, methods, and apparatuses for regulating the delivery of negative-pressure therapy are described. The system includes a negative-pressure source, an energy source, and a switch. The switch can include a first conductor electrically coupled to the negative-pressure source, a second conductor electrically coupled to the energy source, and a diaphragm having a first position electrically coupling the first conductor to the second conductor and a second position separated from the first conductor and the second conductor. The diaphragm is configured to move between the first position and the second position in response to a differential between a control pressure and a therapy pressure.

Systems, methods, and apparatuses for regulating the delivery of negative-pressure therapy are described. The system includes a negative-pressure source, an energy source, and a switch. The switch can include a first conductor electrically coupled to the negative-pressure source, a second conductor electrically coupled to the energy source, and a diaphragm having a first position electrically coupling the first conductor to the second conductor and a second position separated from the first conductor and the second conductor. The diaphragm is configured to move between the first position and the second position in response to a differential between a control pressure and a therapy pressure.

An on-load tap changer head includes: a first region for an insulating fluid of the on-load tap changer to flow; a second region separated from the first region by a wall; and a detector for detecting an increased flow speed of the insulating fluid. The detector includes: a flow flap in the first region configured to tilt from a defined flow speed of the insulating fluid from a first position to a second position; a first magnet secured to the flap such that in the second position of the flow flap, the first magnet is in an immediate vicinity of the wall; a second magnet in the second region in the immediate vicinity of the wall; and a switch in the second region that is operationally coupled to the second magnet such that tilting over of the flow flap from the first position to the second position actuates the switch.

Systems, methods, and apparatuses for regulating the delivery of negative-pressure therapy are described. The system includes a negative-pressure source, an energy source, and a switch. The switch can include a first conductor electrically coupled to the negative-pressure source, a second conductor electrically coupled to the energy source, and a diaphragm having a first position electrically coupling the first conductor to the second conductor and a second position separated from the first conductor and the second conductor. The diaphragm is configured to move between the first position and the second position in response to a differential between a control pressure and a therapy pressure.

Systems, methods, and apparatuses for regulating the delivery of negative-pressure therapy are described. The system includes a negative-pressure source, an energy source, and a switch. The switch can include a first conductor electrically coupled to the negative-pressure source, a second conductor electrically coupled to the energy source, and a diaphragm having a first position electrically coupling the first conductor to the second conductor and a second position separated from the first conductor and the second conductor. The diaphragm is configured to move between the first position and the second position in response to a differential between a control pressure and a therapy pressure.

A pressure sensitive sensor is composed of a cylindrical shape body including therein an inner peripheral surface and a hollow portion along a longitudinal direction of that cylindrical shape body, and being made of an elastic electrical insulating member, and a plurality of electrode wires arranged in a helical shape along the inner peripheral surface of the cylindrical shape body, and arranged in such a manner as to have no contact with each other. In the pressure sensitive sensor, in a cross-sectional view perpendicular to the longitudinal direction of the cylindrical shape body, at least some part of the inner peripheral surface of the cylindrical shape body lying between adjacent ones of the plurality of the electrode wires on the inner peripheral surface of the cylindrical shape body is formed in an inner side in radial directions of a circle passing through centers of the plurality of the electrode wires.