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“STATIC BALANCING VALVES”: BASIC CONCEPTS AND APPLICATIONS

“STATIC BALANCING VALVES”: BASIC CONCEPTS AND APPLICATIONS. VIR - RED-WHITE VALVE CORP. INDEX OF CONTENTS. PART #1: NEED FOR BALANCING: KEY CONCEPTS DEFINITION OF DRV PART #2: NEED FOR FLOW RATE MEASUREMENT: KEY CONCEPTS DEFINITION OF MEASUREMENT DEVICE – FO DRV

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“STATIC BALANCING VALVES”: BASIC CONCEPTS AND APPLICATIONS

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  1. “STATIC BALANCING VALVES”:BASIC CONCEPTS AND APPLICATIONS VIR - RED-WHITE VALVE CORP.

  2. INDEX OF CONTENTS • PART #1: • NEED FOR BALANCING: KEY CONCEPTS • DEFINITION OF DRV • PART #2: • NEED FOR FLOW RATE MEASUREMENT: KEY CONCEPTS • DEFINITION OF MEASUREMENT DEVICE – FO DRV • PART #3: VIR-RWV FIXED ORIFICE BALANCING SERIES: • SERIES 9517 - RWV FIXED ORIFICE DRV • SERIES 9400 – VIR METERING STATION VIR-RWV Static Balancing Series

  3. NEED FOR BALANCING:ENERGY OF A STEADY FLUID FLOW THE BERNOULLI’S THEOREM STATES THAT AT EVERY POINT OF A CIRCUIT THE LEVEL OF ENERGY OF THE FLUID FLOW (HEAD) CAN BE EVALUATED AS SUM OF THREE ENERGIES OF DIFFERENT NATURE: • GRAVITATIONAL (RELATED TO SECTION HEIGHT) 2. PIEZOMETRIC (RELATED TO FLUID LOCAL PRESSURE) 3. KINETIC (RELATED TO FLUID LOCAL VELOCITY) VIR-RWV Static Balancing Series

  4. NEED FOR BALANCING:HEAD-PRESSURE CONCEPT FLUID FLOW HEAD IS RELATED TO FLUID PRESSURE BUT AS A GENERAL RULE FLUID FLOW HEAD IS NOT EQUAL TO FLUID PRESSURE VIR-RWV Static Balancing Series

  5. NEED FOR BALANCING:HEAD-PRESSURE EXAMPLES CONCEPT EXAMPLE IN A SIMPLIFIED SITUATION: STEADY FLOW OF A “PERFECT” FLUID FREE FROM VISCOSITY (THE HEAD OF THE FLOW IS A COSTANT). VIR-RWV Static Balancing Series

  6. NEED FOR BALANCING:HEAD-PRESSURE EXAMPLES VIR-RWV Static Balancing Series

  7. DOUBLE "ELBOW” CURVE COIL STRAINER LONG TUBE LENGTH NEED FOR BALANCING:HEADLOSS CONCEPT IN REAL FLUIDS VISCOSITY AND THEREFORE FLUID FRICTION EXISTS FRICTIONS CAUSES ENERGY LOSSES THAN CAN BE DISTRIBUITED (FLUID-TUBE WALLS FRICTION) OR CONCENTRATED (SHARP VARIATION OF CROSS SECTION, TUBE CURVES) DUE TO FRICTION THE ENERGY OF THE FLUID FLOW DECREASES FROM POINT TO POINT FLOWING THROUGH THE CIRCUIT (HEADLOSS). WHATEVER THE NATURE ALL THE ENERGY DISSIPATIONS SUM THEIR EFFECTS, CAUSING HEADLOSS. VIR-RWV Static Balancing Series

  8. DISTRIBUITED LOSSES CONCENTRATED LOSSES COSTANT PARAMETER RI= number1 RI=number2 NEED FOR BALANCING:HYDRAULIC RESISTANCE CONCEPT VIR-RWV Static Balancing Series

  9. NEED FOR BALANCING:DEFINITION OF COEFFICIENT Cv VALUE OF HYDRAULIC RESISTANCE RI OF AN HYDRAULIC COMPONENT IS A KEY DATA FOR DESIGNERS. IN COMMON PRACTICE PARAMETER RI IS NOT EMPLOYED DIRECTLY: COEFFICIENT Cv IS PROVIDED AND USED IN ITS PLACE: VIR-RWV Static Balancing Series

  10. NEED FOR BALANCING:UNBALANCED SYSTEM VIR-RWV Static Balancing Series

  11. NEED FOR BALANCING:BALANCED SYSTEM VIR-RWV Static Balancing Series

  12. DRV:DEFINITION AND FUNCTIONS DOUBLE REGULATING GLOBE VALVE: “A GLOBE VALVE FOR THE REGULATION OF FLOW RATE HAVING AN ESTABLISHED VALVE CHARACTERISTIC AND PROVIDED WITH INDICATED POSITIONS OF THE VALVE OPENING AND AN ADJUSTABLE STOP DEVICE TO LIMIT THE OPENING MOVEMENT SUCH THAT THE VALVE CAN BE CLOSED FOR ISOLATION PURPOSES AND RE- OPENED TO THE PREVIOUSLY SET POSITION” (BS-7350 STANDARD) • TWO FUNCTIONS OF A DRV: • BALANCING (REGULATION OF FLOW RATE) • SHUT-OFF ( ISOLATION PURPOSES) VIR-RWV Static Balancing Series

  13. MEMORY STOP DEVICE VALVE SEAT END-CONNECTIONS DRV:STRUCTURE AND MAIN FEATURES HANDWHEEL INCLUDING DEVICE FOR READING OF CURRENT OPENING POSITION REGULATING CONE VIR-RWV Static Balancing Series

  14. NARROW SECTION DRV:OPERATING PRINCIPLE FLOW REGULATION OBTAINED BY CALIBRATED THROTTLING BY MEANS OF REGULATING CONE FLUID FLOW VIR-RWV Static Balancing Series

  15. NEED FOR MEASURING:BERNOULLI’S APPLICATIONS THE BERNOULLI’S THEOREM GENERALIZED TO REAL FLUID WITH HEAD LOSSES IS THE BASIS FOR MANY FLOW RATE MEASURING METHODS: VIR-RWV Static Balancing Series

  16. NEED FOR MEASURING:DIFFERENTIAL MANOMETER VIR-RWV Static Balancing Series

  17. FLOW MEASUREMENT DEVICE:DEFINITIONS AND FUNCTION FLOW MEASUREMENT DEVICE: “A DEVICE IN WHICH A DIFFERENCE IN PRESSURE IS INDUCED ACROSS AN ORIFICE, FIXED OR VARIABLE, THE MEASUREMENT OF WHICH ENABLES THE CORRESPONDING FLOW RATE TO BE ESTABLISHED BY REFERENCE TO A CALIBRATION CHART” FIXED ORIFICE: “THE PART OF A FLOW MEASUREMENT DEVICE WHICH INDUCES A DIFFERENCE IN PRESSURE FOR FLOW MEASUREMENT PURPOSES AND WHICH IS OF FIXED DIMENSIONS AND GEOMETRY” (BS7350) • ONE FUNCTION OF A MEASUREMENT DEVICE: • MEASURING (DETERMINATION OF FLOW RATE) VIR-RWV Static Balancing Series

  18. UPSTREAM TEST-POINT DOWNSTREAM TEST-POINT FIXED ORIFICE END CONNECTIONS FLOW MEASUREMENT DEVICE: STRUCTURE VIR-RWV Static Balancing Series

  19. SEC. 2 (NARROW SECTION): HIGH FLUID VELOCITY SEC.1 (UPSTREAM): STANDARD FLUID VELOCITY SEC. 3 (DOWNSTREAM): STANDARD FLUID VELOCITY FLOW MEASUREMENT DEVICE: FUNCTIONING VIR-RWV Static Balancing Series

  20. EASY MEASURING • GOOD ACCURACY FLOW MEASUREMENT DEVICE:KEY DATA DPS CVS FLOWRATE MEASUREMENT HEADLOSS EVALUATION DP CV VIR-RWV Static Balancing Series

  21. FIXED ORIFICE DRV:DEFINITION AND FUNCTIONS FIXED ORIFICE VALVE: “A DOUBLE REGULATING GLOBE VALVE INCLUDING A FIXED ORIFICE WITH PRESSURE TAPPING POINTS, USED FOR THE DETERMINATION OF FLOWRATES AND ALSO FOR REGULATING AND ISOLATING PURPOSES” • THREE FUNCTIONS OF A FO-DRV: • MEASURING (DETERMINATION OF FLOW RATE) • BALANCING (REGULATION OF FLOW RATE) • SHUT-OFF ( ISOLATION PURPOSES) VIR-RWV Static Balancing Series

  22. HANDWHEEL WITH OPENING LEVEL INDICATOR DIFF. PRESSURE TEST POINTS MEMORY STOP FIXED ORIFICE REGULATING CONE FIXED ORIFICE DRV:STRUCTURE VIR-RWV Static Balancing Series

  23. ONE UNIQUE CVS DRV DPS METERING STATION FLOW DP (HEADLOSS) FIXED ORIFICE DRV:STRUCTURE VIR-RWV Static Balancing Series

  24. VARIABLE ORIFICE DRV:DEFINITION AND FUNCTIONS VARIABLE ORIFICE VALVE: “A DOUBLE REGULATING GLOBE VALVE WITH PRESSURE TAPPING POINTS, USED FOR THE DETERMINATION OF FLOWRATES AND ALSO FOR REGULATING AND ISOLATING PURPOSES” (BS7350) • THREE FUNCTIONS OF A VO-DRV: • MEASURING (DETERMINATION OF FLOW RATE) • BALANCING (REGULATION OF FLOW RATE) • SHUT-OFF ( ISOLATION PURPOSES) VIR-RWV Static Balancing Series

  25. HANDWHEEL WITH OPENING LEVEL INDICATOR PRESSURE TEST POINTS (UPSTREAM AND DOWNSTREAM) MEMORY STOP REGULATING CONE VARIABLE ORIFICE DRV:STRUCTURE VIR-RWV Static Balancing Series

  26. FUNCTION OF OPENING POSITION VARIABLE ORIFICE DRV:FUNCTIONING DP (SIGNAL) DP (HEADLOSS) VIR-RWV Static Balancing Series

  27. VIR-RWV SERIES 9517: FO-DRV VIR-RWV Static Balancing Series

  28. 9517 FO-DRV • FLOW RATE MEASUREMENT: • EASY MEASURE • GOOD ACCURACY • FLOW REGULATION: • COMFORT AND EFFECTIVENES OF REGULATION GUARANTEED BY CAREFULLY DESIGNED VALVE CHARACTERISTIC. • INSULATION RELIABILITY: • 100% OF THE VALVES TESTED IN FACTORY FOR SEAT THIGTHNESS. VIR-RWV Static Balancing Series

  29. 9517 FO-DRV: STANDARD FLOW - LOWFLOW VIR-RWV Static Balancing Series

  30. DESIGN FLOWRATE AXIS DESIGN HEADLOSS AXIS 9517 FO-DRV: PRESETTING • JOIN WITH A STRAIGHT LINE DESIGN FLOWRATE AND DESIGN HEAD LOSS • FIND DESIGN CV AS INTERSECTION WITH CV AXIS • DRAW A STRAIGHT ORIZZONTAL LINE UNTIL THE VALVE CHARACTHERISTIC VIR-RWV Static Balancing Series

  31. VIR-RWV SERIES 9400 M.S. • HIGH ACCURACY FOR FLOWRATE MEASURMENT • MALE/FEMALE NPT THREAD CONNECTIONS • ROBUST DESIGN VIR-RWV Static Balancing Series

  32. EASY MEASURING • GOOD ACCURACY SERIES 9400: METERING STATION DPS CVS FLOWRATE MEASUREMENT HEADLOSS EVALUATION DP CV VIR-RWV Static Balancing Series

  33. SERIES 9400: METERING STATION VIR-RWV Static Balancing Series

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