THREE-WAY TWO-POSITION SPOOL-TYPE PALM-BUTTON-OPERATED PNEUMATIC DIRECTIONAL VALVE MECHANISM

Compressed air is supplied from the main to port 1, and port 2, the outlet port of the valve, is connected to the atmosphere through port 3. When palm button 4 is pressed, spool 5 is pushed downward, overcoming the resistance of spring 6. In its downward motion, lower packing cup 7 of the spool passes a row of radial ports 8, disconnecting them from port 3 and the atmosphere. Air from port 1 passe…