拆开压力开关之黑色塑料外壳，可见一金属制调节螺丝，将其逆时针旋转，则作

After disassembling the black plastic casing of the pressure switch, a metal adjusting screw can be seen. If it is turned counterclockwise, the applied pressure decreases; otherwise, the applied pressure increases. But the pressure difference remains unchanged.

Unwrapping the black plastic housing of the pressure switch, it can be seen that a metal adjustment screw, turnit counterclockwise, the action pressure is reduced; But its pressure difference remains the same.

When the black plastic shell of the pressure switch is removed, a metal adjusting screw can be seen. If it is turned anticlockwise, the applied pressure will be reduced; otherwise, the applied pressure will be increased. But the pressure difference remains unchanged.