The working principle and precautions of pressure switch

The working principle of the pressure switch: When the pressure in the system is higher or lower than the rated safety pressure, the disc in the sensor moves instantaneously, and the switch connector is turned on or off through the connecting guide rod. When the pressure drops or rises At the rated recovery value, the disc is reset instantly and the switch automatically resets, or in simple words, when the measured pressure exceeds the rated value, the free end of the elastic element is displaced, and the switch element is pushed directly or after comparison to change the switch element The on-off state achieves the purpose of controlling the measured pressure. The elastic elements used in the pressure switch include a single-turn spring tube, diaphragm, bellows and bellows.

Pressure switches are widely used in the high and low pressure protection control of household, commercial, and automobile refrigeration systems, steam conditions and power stations; accumulators, receivers, flash tanks, separators, scrubbers, oil refining devices. It is also suitable for high and low pressure protection control of various equipment and tools. But in the selection of pressure switch, the following points must be paid attention to:

1. The necessity of explosion-proof: explosion-proof forms are divided into explosion-proof type and intrinsically safe type, and most of Nagano products are explosion-proof type.

2. Whether you need to bring instructions: according to customer instructions.

2. Whether you need to bring instructions: according to customer instructions.

4. Determination of setting value and pressure range: The recommended setting range is between 30%-65% of the pressure range, and the setting range is between 15%-90% of the pressure range.

5. The form of differential connection: adjustable or fixed.

6. Whether there is pulsation: If the pressure has pulsation or vibration, a throttle valve is required to suppress the damage of the pulsating pressure to the instrument.

7. Occasions with diaphragm: When measuring corrosiveness, high viscosity or high temperature, it is necessary to use diaphragm.