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Manual Flow Controller
 Brooks Model FC8800 Series flow controllers are designed to maintain a constant differential pressure across an integral manual flow regulating valve. Series 8800 controllers are designed for all liquid and gas flows with constant downstream pressures; series 8900 controllers are for all liquid and gas flows with constant upstream pressures.
Manual Precision Flow Controller, Tight Shutoff
 Brooks Model FC8744 NRS (non-rising stem) flow controllers accurately adjust and maintain small gas flows. They are designed for constant upstream, variable downstream applications. Suitable for precise control, this valve possesses a high turns-to-lift ratio which provides stable flow for any given stem position.
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