Valtek Flow Boosters.pdf
Valtek Flow Boosters.pdf
Valtek Flow Boosters.pdf
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<strong>Valtek</strong> <strong>Flow</strong> BoosterDesign FeaturesFewer PartsProvideSimplifiedMaintenanceBypass ValveAllows Easy,AdjustableResponseSpeedEpoxy Powder-Painted Bodyfor CorrosionResistanceTight Shutoffwith Soft-seatSealingHeavy-DutyConstruction ResistsImpact, CorrosionLight Weight forEasy InstallationFigure 1: <strong>Flow</strong> Booster FeaturesIntroductionThe <strong>Valtek</strong> ® <strong>Flow</strong> Booster is a one-to-one pressureregulator that amplifies flow to increase the strokingspeed of actuators.<strong>Boosters</strong> are generally used in conjunction with throttling,control- valve positioners to provide fast action withlarge input signal changes. The booster allows normalpositioner air flow and normal actuation with small inputsignalchanges. This variation in air flow is accomplishedwith an internal bypass valve that is adjusted toobtain the desired speed, while maintaining dynamicstability.Booster OperationThe booster is a pressure-balanced instrument thatresponds to large input signal changes. Adjusting thebypass valve will either increase or decrease the booster’ssensitivity to a signal change. A small input signal to thebooster will not create a pressure differential across the2diaphragm assembly sufficient to cause booster actuation.Rather, the air passes through the bypass portingwhile the poppet valve remains tightly shut to preventinstability. A sudden, large input signal change willcreate a pressure differential across the diaphragmassembly, forcing the poppet down and permitting highair flow into the control valve actuator.This high air flow continues until the pressure differencebetween the control valve actuator and the input signalfalls within the dead band limits of the booster. Likewise,when the booster is used to exhaust a control valveactuator, the pressure imbalance across the diaphragmassembly forces it up off the upper poppet valve and theair exits the booster between the diaphragms. For on /off control valves, the bypass valve can be nearly closedto optimize stroking speed.<strong>Flow</strong>serve Corporation, <strong>Valtek</strong> Control Products, Tel. USA 801 489 8611
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