This valve is intended for delivering compressed air to the exit port when it enters from either of two admission ports, the other port being connected at this time to the atmosphere. Air entering through port 1 shifts plunger 4 to the position shown and flows through passages in the plunger and port 5 to port 3 (Fig. a). The plunger shuts off air flow from port 1 to port 2 which, at this time, is connected to the atmosphere. If air is delivered through port 2 and port 1 is connected to the atmosphere, the plunger is shifted by air pressure to the left and air from port 2 flows out through port 3. If air is delivered simultaneously to both inlet ports, it flows to port 3. This valve can be employed for obtaining logic function "OR" by pneumatic means in control design. The principle of the valve is shown schematically in Figs. b and c.
$3634$SHP,Va$