Dual-Flow Valves

Dual-Flow Valves limit vacuum leakage in a system where some of the suction cups may not be in sealing contact with the work piece. Since vacuum flow is limited by a small orifice, Dual-Flow Valves are only recommended for non-porous parts or for slightly porous light weight parts.

There are two main ways to apply Dual-Flow Valves: The first is to bring Dual-Flow Valves equipped with vacuum cups into contact with the work piece and then turn on the vacuum source. Non-sealing cups will leak and cause the associated Dual-Flow Valves to close to orifice flow only.

The second way to use Dual-Flow Valves is to turn the vacuum source on to close all Dual Flow Valves before the Vacuum Cups contact the work piece and then allow the Dual-Flow orifice flow to establish vacuum within the cups once contact is made.

In either case, part release is accomplished by removing the vacuum source and admitting atmospheric air to reopen the Dual Flow Valves. For a faster cycle time, use a blow-off pulse of compressed air to break the vacuum and release the part more quickly.

Sizing A Vacuum Pump

From the table below, determine the orifice flow at your system's maximum vacuum operating level. Multiply this by the maximum number of non-sealing cups in the system. Select a pump that will give this total flow rate at the system vacuum level plus a factor of safety.

Caution:

If Dual-Flow Valves are used with a heavy porous part, the part may be dropped suddenly due to porosity flow through the part being greater than the available orifice flow. This can occur even if there is excess vacuum pump capacity. For this type of system, use Flow Sensor Valves.

20, 25 & 30 mm Cups

40 mm Cups

50 mm Cups