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 flow 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).
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Model VCD 1000
Variable Constant Differential Flow Controller
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Customer Value Proposition
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 flow 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).
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Product Features
• 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
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SPECIFICATIONS
Capacities
See chart on PDF
Ratings
Maximum operating pressure: 250 psig; maximum operating temperature; 160°F; pressure drop required: 15 psi minimum
Performance
Control accuracy: 0.3% of instantaneous flow rate. Adjustability: 0-100% of flow over 14 turns
Connections
1/8’’ compression fitting (brass) with aluminum body; 1/8’’ compression fitting
(stainless steel) with SS body
Dimensions
Refer to diagram on PDF
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MATERIALS OF CONSTRUCTION
Controller Body
Aluminum or stainless steel
Controller Diaphragm
Fairprene® BN-5029 or stainless steel
Orifice
Brass with aluminum body; 316 stainless steel with stainless steel body
O-Rings
Buna N or Viton
Filter
Aluminum with aluminum body; stainless steel with stainless steel body
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