![]() Pressure switch inner workings at low pressure: the big spring is forcing the membrane (green circle) downwards (red arrow), while the air pressure tries to push it upwards (yellow arrows). I bought this pressure switch just for the purpose of illustration, and have no intention of using it on an air compressor, so here it goes. This is not recommended when you still want to use your pressure switch, as it will damage the membrane. I will simulate the air pressure with a screwdriver (instead of the compressed air pushing up, it's me with the screwdriver pushing up :). I will try to explain it with the pressure switch I have here on my desk. For the inner workings of the pressure switch, this simply means that the switch closes again at a lower pressure than the pressure where the switch closes (built-in hysteresis). This mechanism is also connected to the second set-screw which sets the differential pressure. Now this isn't a direct connection, but there is an ingenious mechanism inside, that makes the switch flip-over at once, at a certain pressure, and not slowly slowly ("snap-action"). The lever in turn opens the electrical contacts and the compressor stops. When the membrane moves upward, so does the lever. ![]() The membrane (and lever) will move upward at this point. As long as the downward force of the spring is higher than the upward force of the compressed air, the membrane (and lever) stay down.īut when the pressure rises, there comes a point where the upward force of the compressed air is higher than the downward force of the spring. The other side of the membrane is connected to a spring and a lever that acts on the electrical switch. Since the area is constant, the force generated is directly proportional to the air pressure. How much force depends on two things: the area (square mm's) of the membrane and the pressure (bar) of the compressed air. The pressure in transformed into a force. The air pressure at the inlet port acts on a flexible membrane. Which simply means, that there is an electrical switch, which is forced open or closed by air pressure. Pressure switches are pressure actuated electrical switches. To give you a better understanding of pressure switches in general, I will explain on this page how they work. Off and on pressure can be adjusted variably.Learn how a compressor pressure switch works on the inside.You get a new mechanical diaphragm pressure switch as it does.3-phase for simultaneous switching of all 3 phases.On and off pressure adjustable from 3.0 to 12 bar.Note: Please allow minor error due to manual measurement.ĭue to the difference between different monitors, the picture may not reflect the actual color of the item. Now this isn’t a direct connection, but there is an ingenious mechanism inside, that makes the switch flip-over at once, at a certain pressure, and not slowly slowly (“snap-action”). ![]() How much force depends on two things: the area (square mm’s) of the membrane and the pressure (bar) of the compressed air. Wich simply means, that there is an electrical switch, which is forced open or closed by air pressure. Air Compressor Pressure Switch Control Valve 380/400V ![]()
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