Pneumatically controlled automatic valve
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What is the function of the air-controlled valves on the nitrogen delivery pipeline, specifically the valves located at the two red circles shown in the diagram?
The large valve below is a three-way valve; I think it is used to enable fast opening and closing of the valve. What is the function of that small valve?
It seems like one is a check valve and the other is a pneumatic amplifier!
The larger valve below should have a magnification function; I’m not sure what purpose the smaller valve serves