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 passes through a row of radial ports 9 into outlet port 2. When palm button 4 is released, spool 5 is returned by spring 6 to the position shown. The valve can be used as a two-way valve if a plug is screwed into port 3.
$3683$SHP,FC$