Compressed air is delivered through a directional valve to port 1 and, forcing diaphragm 2 downward shuts off port 3 which is connected to the atmosphere (Fig. a). The air flows through twelve peripheral holes in the diaphragm to outlet port 4 of the valve which is connected to a power cylinder. In emptying the cylinder (Fig. b), the directional valve connects port 1 to the atmosphere and air from the cylinder is discharged to the atmosphere through port 3. This valve is mounted near to the cylinder and enables a large volume of air to be rapidly discharged upon emptying the cylinder without requiring large-diameter pipelines leading to the directional valve. The valve finds application for high-speed cylinders.
$3631$SHP,Va$