The Porter Model VCD 1000 flow controller is precision-engineered to control low gas flows at constant mass flow rates regardless of changes in downstream pressure. The VCD 1000 maintains a preset pressure differential across a laminar flow element. Turning the fine-pitched adjusting stem varies the force on an internal diaphragm, which alters the differential pressure across the laminar low element, thereby changing the flow rate. This design yields extremely linear flow output in relation to stem rotation and virtually eliminates the sawtoothing associated with valve-based controllers. The laminar flow elements are available in full scale flow rates from 5 sccm up to 1500 sccm (He @ 70°F and 50 PSIG).

Markets: 

• Chemical 

• Pharmaceutical

• Laboratories and Test Facilities

• General Purpose

Features/Benefits:

• Delrin® adjusting stem with 56 pitch threads

• Turns Vs. flow relationship is linear 

• Bubble-tight shut-off

• Full scale flow rates from 5 SCCM up to 1500 SCCM (He @ 70°F and 50 PSIG)

• Replaceable inlet filter included

• Standard panel mount configuration

Applications:

• Precision low gas flow control

• Linear flow 

• Gas flow indication

• Flow measurement of gases

• Utilities

• Gas delivery

• Oxygen aeration