Tri-Flow Valves

Tri-flow valves limit vacuum leakage in systems where some of the vacuum cups may not be in sealing contact with the workpiece.
 
Tri-flow valves are a cross between a flow sensor valve and a dual-flow valve. Tri-flow valves are fully open until the flow sensor section closes at the factory preset vacuum flow rate. When closed, a bypass orifice meters vacuum flow to limit leakage to a manageable rate. Workpiece release is accomplished by removing the vacuum source and admitting atmospheric air which also resets any tri-flow valves that have closed to the open position.
 
Tri-flow valves can handle greater porosity flow than dual-flow valves since they’re initially held open. Another advantage of the tri-flow valve is the metering orifice is protected by an integral filter for greater tolerance of contamination.

Tri-flow valves utillzes G 1/8 NPSF connection threads.
 
The normal way to set up a vacuum system using vacuum cups equipped with tri-flow valves is to bring the vacuum cups into contact with the workpiece 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 vacuum cups in sea