Please help analyze what function this valve pneumatic circuit diagram achieves
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1. Are 1 and 3 pneumatic control valves? For this type of pneumatically controlled valve, is it possible to set a specific pressure value at which the valve will operate? That is, the valve will act when the pressure of the instrument air supply AS falls below a certain specific value. 2. How does this pneumatically controlled valve 3 actually work? Is the position-holding function of valve 4 achieved?
1 is for detecting gas source faults； 2 is the solenoid valve, which controls the opening and closing of the cylinder valve ； 3 is the pneumatic transfer valve, which, under the control of the solenoid valve, allows instrument air to enter the upper or lower cylinder. The specific name of each component should be indicated on the label.