Series 1903

Valstop Brass Spring Check Valve Viton® Seals

1903 - Valstop Brass Spring Check Valve Viton® Seals


  • Manufactured in Italy
  • Minimum head loss due to the streamlined flow design
  • Heavy pattern, full bore, high flow capacity
  • Excellent seal at low & high pressure, within a wide temperature range
  • Quiet operation and reduction in water hammer
  • Wear resistant and long lasting materials
  • Compact dimensions, superior performance and high quality
  • Can be installed in horizontal or vertical position
  • Not WaterMarked and not suitable for installations that must be
    AS/NZS 3500 compliant (drinking or non-drinking water)
  • All valves pressure tested during production
  • Size range: 6mm to 100mm



  • Temperature range: -20°C to 135°C
  • Maximum operating pressure at nominal temperatures:
  • 6mm to 15mm: 4000 kPa
  • 20mm to 25mm: 3000 kPa
  • 32mm to 50mm: 2500 kPa
  • 65mm to 100mm: 1600 kPa
  • Cracking pressure: 2.5 kPa
  • For ratings at specific temperatures refer to graph overleaf

The information in this specification must only be used for assessing a product’s suitability for a particular use.
The information remains the intellectual property of Zetco Valves Pty Ltd and must not be used or reproduced for any other purpose without Zetco’s prior written permission.