Problems with two-stage (three-position) pneumatic cut-off ball valves
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Discussion is welcome: 1. Three-position pneumatic ball valves enable the valve to open and close twice between 0° and 90°, thereby controlling the flow rate in pipelines; they are widely used in bulk handling systems for petroleum and chemical products, and are equipped with components such as explosion-proof limit switches and explosion-proof solenoid valves. What working positions do Positions 1, Position 2, and Position 3 in the figure below represent respectively?
If the image above is not clear, you can refer to the attachment.
Position 1: Middle position. Position 2: Fully open. Position 3: Fully closed
1 Position: Middle position； Position 2: Fully open position ； Position 3: Fully closed position.
The corresponding positions are: middle, on, off