The electronic pressure regulator is connected to the compressed air line and is used to maintain the pressure after itself. The required pressure is set by an electrical signal of 0...10V, 0...20 mA or 4...20 mA, depending on the modification. The electronic pressure regulator consists of a three-port diaphragm valve with a built-in outlet pressure sensor and an electronic control system that ensures that the set pressure is maintained at the valve outlet. The valve has three ports: inlet, outlet and air outlet.
The outlet pressure is regulated by changing the position of the flexible diaphragm. If the outlet pressure is less than the set pressure, the diaphragm bends down and mechanically opens the compressed air supply valve. At the same time, more air enters the outlet of the pressure regulator than before, as a result of which the outlet pressure increases until the diaphragm returns to its original position and the outlet pressure becomes equal to the set one.
If the outlet pressure is higher than the set pressure, the diaphragm bends upward and mechanically opens the relief valve. As compressed air is discharged into the atmosphere from the outlet of the pressure regulator, the outlet pressure decreases until the diaphragm returns to its original position and the outlet pressure becomes equal to the set pressure.
The required outlet pressure is set by an integrated electronic control system in proportion to the electrical signal at the input of the regulator (4...20 mA, 0...10 V, etc.) using two electromagnetic mini valves. The required outlet pressure is set as follows. The built-in pressure sensor measures the air pressure at the valve outlet. If this pressure is greater than the set pressure, the control system applies voltage to the electromagnetic coil of the mini-valve, through which compressed air is discharged from the zone "above the membrane" into the atmosphere. This leads to a decrease in pressure "above the membrane" and upward deflection of the membrane. As a result, the pressure at the valve outlet decreases until the diaphragm returns to its original position and the outlet pressure becomes equal to the set pressure.
If the pressure at the outlet of the regulator is less than the set pressure, the control system applies voltage to the electromagnetic coil of the mini-valve supply, through which compressed air from the main enters the zone "above the diaphragm". This leads to an increase in pressure "above the membrane" and a downward deflection of the membrane. As a result, the pressure at the valve outlet increases until the diaphragm returns to its original position and the outlet pressure becomes equal to the set pressure.
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