Sapag - Industrial Valves


Industrial Valves

 

CLASAR Check Valve

 

General description

 

Type :

Nozzle type, High dynamic answer with polyurethane ‘obturator’

Non Slam and silent type (no water hammer)

  

End connection:

Wafer:

DN 80 (3”) to DN 500 (20”)

Double-Flanged:

DN 600 (24”) to DN 1800 (72”)

Size:

DN 80 mm (3”) to 1800 mm (72”)

Working pressure:

PN10 to PN50

Temperature:

-15°C to +90 °C

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Design and Features

 

Design feature: ‘obturator’

  • ‘Obturator’ made in Polyurethane (Density = 1) for quick closure

    • Reduced Water column reverse velocity.

    • No creation of water hammers (High dynamic performances)

    • No noise

    • No corrosion

    • Very good ‘erosion’ coefficient (superior to SS 316)

    • Very good resistance to ‘chocks’

  • Spring without guide

    • No risk of jamming

    • Spring material: Stainless steel (fresh water) or Inconel for sea water

Design feature: Body

  • Flow diffuser

    • Very quick flow recovery (Less than 2 D)

  • Double Flanged Body

    • DN600 (24”) to DN1800 (72”)

  • Wafer Body

    • DN80 (3”) to DN500 (20”)

  • Very short face to face

    • For easy installation in the plant room

  • Materials

    • Ductile Iron (Epoxy coated)

    • Ni-Resist Ductile Iron (Sea Water)

    • Stainless steel also available

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Water hammer creation

 

Reverse velocity against time when pumps are suddenly stopped:

  • Water column will reverse and decelerate (dV/dt).

  • To reduce reverse velocity (Vr) the check valve shall close very quickly

 

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Dynamic answer performances

 

Dynamic answer performance (By DELFT laboratory)

  • Dynamic answer performance comparison:

    Swing check type

  • Duo-check type

  • Recoil type

  • Mannesmann (Nozzle type)

  • Clasar

    • Among all types of check valves, Clasar is recognized to be the ‘state of the art’ in terms of dynamic performance and water hammer (and noise) reduction.

Water hammer test comparison:

  • Swing check type

    • 34 bars of ‘pressure increase’

  • Duo-check type

    • 15 bars of ‘pressure increase’

  • Clasar

    • Only 5 bars of ‘pressure increase’

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PartS list

 

Clasar Wafer

Clasar double-Flanged

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Applications

 

  • Water Treatment / Pumping / distribution

  • Large size pumping stations with high water heads

  • Fresh or sea water cooling systems

  • HVAC

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Product pictures

 

 

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