Technical Documentation Pressure Independent Characterized ...

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Pressure Independent Characterized Control Valves (PICCV) Features and Benefits 6 ● Characterizing disc – made of Tefzel ® known for excellent strength and chemical resistance ● Thermal isolating adapter between flange and actuator ● Easy direct coupling of actuator with a single screw ● Forged brass valve body – no pin-hole leaks Disadvantages of Today’s Systems ● Regulator Assembly ● Time consuming balancing effort ● Rebalancing required when adding to system or remodeling ● Poor valve authority at average or low load ● Balancing procedure dictates quality ● Potential spreading of control problems can occur when one or more loops are instable, due to interactive nature of circuits ● Low ∆T reduces efficiency of chillers, condensing boilers, or coils ● Starving of terminals in less favored spaces results in long start-up time Features ● Automatic dynamic system balancing ● Field adjustable flow rate ● 5 – 50 PSI differential pressure operating range (gradual flow will increase from 0-5 PSI) ● 0.5 – 100 GPM (1/2” – 2”) ● 5 year warranty *Teflon ® is a registered product of Dupont ● Vent holes reduce condensation build-up ● Non-corroding chrome-plated brass Advantages of the PICCV ● Actuator can be mounted in four different positions ● Perpendicular mounting flange and square drive head eliminate lateral forces on the stem ● Blow-out proof stem with thrust-bearing Teflon ® disc and double O-ring design for long service life* ● Teflon ® seats with O-rings provide constant seating force against the ball and reduce torque requirement* ● Easy selection, no Cv calculation required ● Hydronic balancing is simplified, as the circuits are not interactive ● Flexible commissioning ● One piece installation saves 50% of labor costs, installation space, and investment for for balancing valve ● Reduces pumping costs ● Maintains ∆T for higher efficiency of chillers and condensing boilers ● Visualizes flow in a BMS system and provides accurate flow for each degree of opening ● Prevents overflow or underflow for fast start-up Options Patented ● P/T ports for flow or temperature measurement ● Belimo PC-Tool for commissioning ● Customized Flows ● Certified Factory Calibrated Flows ● Weather shields ● Auxiliary switches ● Metric threads ® J20728 - 04/07 - Subject to change. © Belimo Aircontrols (USA), Inc.
J20728 - 04/07 - Subject to change. © Belimo Aircontrols (USA), Inc. ® The Best Way to Control Flow Maintain design flow independent of pressure variations The PICCV is a two-way valve that will supply a specific flow for each degree of ball opening regardless of pressure variations in a system. Flow accuracy ≤ ± 5% (5 to 50 PSI) (absolute) Variation due to ≤ ± 5% (5 to 50 PSI) manufacturing tolerances Hysteresis ≤ 1% (absolute) Operation PICCV consists of a differential pressure regulator in series with a control valve. The amount of flow that passes through the valve is controlled by the use of a pressure regulator that moves according to the change in pressure above and below it. All pressure changes are absorbed by the pressure regulator allowing the differential pressure to be held constant over the control valve section thereby giving the same flow. Pressure Independent Characterized Control Valve TM (PICCV) Flow Rate (GPM) 14 12 10 8 6 4 2 0 Water enters valve – pressure is P1 (high) Water passes through regulator, disc, and ball – pressure drops PICCV Performance Operating Differential Range of 5 – 50 PSI 0 5 10 15 20 25 30 35 40 45 50 Differential Pressure PSI Regulator Section Control Valve Section Low pressure pulls regulator down against the spring force hence reducing the regulator opening, reducing the flow. 100% 90% 80% 70% 60% 50% 40% Water exits valve – pressure is P2 (low) Ports sense pressure drop and transfer it through this channel below regulator % Ball Opening 7
Page 1 and 2: Belimo Project: 1100 Peachtree, Atl
Page 3 and 4: J20728 - 04/07 - Subject to change.
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Technical Documentation Pressure Independent Characterized ...

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