TWO-WAY DIAPHRAGM-TYPE PNEUMATIC DIRECTIONAL VALVE MECHANISM

Compressed air is supplied from the main to port 1. Depending upon the position of roller 4, rolling along diaphragm 3, port 1 is either blocked or the air passes into port 2. The rate of air flow is determined by the vertical position of roller 4, which deforms diaphragm 3.
$3697$SHP,FC$