Core feature
Three working positions
Full open (100% open)
Intermediate position (such as 50% opening or other preset value)
Full off (0% open)
Note: The middle position can be customized according to requirements, such as 25%, 75%, etc.
Control mode
The piston is usually driven to different positions by a combination of dual gas control signals (double acting cylinders) or spring return + gas control signals.
Structure type
Double piston type: Three positions are switched through two sets of pistons or cylinders.
Spring assisted: The spring force is used to assist the reset to the middle position, combined with air pressure to control other positions.
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