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2. Sail switch - Wikipedia

   en.wikipedia.org/wiki/Sail_switch

   A sail switch, vane switch or flow switch is a mechanical switch that is actuated on or off in response to the flow or non-flow of a fluid such as air or water. [1] A sail switch typically operates through the use of a paddle or a diaphragm which gets displaced due to the force of fluid or air moving past it.

3. Radiator (engine cooling) - Wikipedia

   en.wikipedia.org/wiki/Radiator_(engine_cooling)

   a thermostat to control temperature by varying the amount of coolant going to the radiator; a fan to draw cool air through the radiator. The combustion process produces a large amount of heat. If heat were allowed to increase unchecked, detonation would occur, and components outside the engine would fail due to excessive temperature. To combat ...

4. Solid-state relay - Wikipedia

   en.wikipedia.org/wiki/Solid-state_relay

   A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. They serve the same function as an electromechanical relay , but solid-state electronics contain no moving parts and have a longer operational lifetime.

5. What should you set your heat to in the winter? Avoid ... - AOL

   www.aol.com/set-heat-winter-avoid-thermostat...

   That means the cost for a professional to come to your home and inspect your unit (anywhere from $150 to $500, Consumer Reports estimates) can pay off in the long run. Consider investing in a ...

6. Ukraine says it has a laser that can shoot down aircraft a ...

   www.aol.com/news/ukraine-says-laser-shoot-down...

   Ukraine has developed a laser weapon capable of shooting down targets from more than a mile away, the country’s drone force commander has claimed. Speaking at a defense summit in Kyiv this week ...

7. Thermostatic radiator valve - Wikipedia

   en.wikipedia.org/wiki/Thermostatic_radiator_valve

   A thermostatic radiator valve on position 2 (15–17 °C) Installed thermostatic radiator valve with the adjustment wheel removed A thermostatic radiator valve (TRV) is a self-regulating valve fitted to hot water heating system radiator, to control the temperature of a room by changing the flow of hot water to the radiator.