Tri-Flow Valves

Tri-Flow Valves limit vacuum leakeage in a system where some of the vacuum cups may not be in sealing contact with the work piece.

Tri-Flow Valves are a cross between Flow Sensor Valves and Dual-Flow Valves because they are fully open until the Flow Sensor section closes at the factory preset vacuum flow-rate then a bypass orifice meters vacuum to a low limit leakage to a manageable rate. Part release is accomplished by removing the vacuum source and admitting atmospheric air which will also reset any closed Tri-Flow Valves to open position. For a faster cycle time, use a blow-off pulse of compressed air to break the vacuum and release the part more quickly.

Tri-Flow Valves can handle greater porosity flow than Dual-Flow Valves due to the fact that they're initially held open. Another advatage isthe Tri0Flow Valves metering orifice is protected by an integral filter for greater tolerance of contamination.

The normal way to set up a vacuum system using Tro-Flow Valves equipped with vacuum cups is to bring them into contact with the work piece and then turn on the vacuum source. Non-sealing cups will leak and cause the associated Tri-Flow Valve to close to orifice flow only. Tri-Flow Valves on cups in sealing contact with the work will remain fully open to handle higher porosity flow rates (normal leakage through the part) than Dual-Flow Valves can.

For a system handling non-porous parts, operation can be as described above or the vacuum source may be turned on before the vacuum cups are in sealing contact with the work. Tri-Flow Valves can pass vacuum flow through the metering orifice to establish vacuum within the vacuum cups after they are placed in sealing contact with the work piece and the Tri-Flow Valves will reset to fully open. This feature is also convenient for use in vacuum holding fixtures. This capability is the only advantage that Tri-Flow Valves have over Flow Sensor Valves.

For mid to high porosity parts, we recommend using Flow Sensor Valves where the closing set point can be adjusted to suit the application.

How To Order:

To order a cup assembled with a Tri-Flow Valve:
Add suffix -18FTF to the cup part number. Cup fittings must have G 1/8" NPSF female thread.

Example: XP-B50N-18FTF

To order for use inline:
TF18F-XX with G 1/8" NPS male.
XX: Specify 0.4, 0.5 or 0.6 SCFM.
Pay close attention to cup size when ordering.