Series 1903

Valstop Brass Spring Check Valve Viton® Seals

1903 - Valstop Brass Spring Check Valve Viton® Seals

FEATURES

  • 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

 

TECHNICAL FEATURES

  • 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

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Check Valve FAQ

Check valves are mechanical valves that permit gases or liquids to flow in only one direction, preventing flow from reversing down the line. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve, while undesirable reverse flow forces the check valve to close. Most check valves contain a flat disc that is slightly larger in diameter than that of the port. Flow indicators on the side of the body indicate the direction of the flow for correct installation.
Spring check valves have a disc held in place by a spring, which means they and can operate in either a vertical or horizontal mounting position because they do not rely on flow pressure or direction to function. Spring check valves are available with many different types of seats, the most common being nylon, which tends to wear quickly, requiring replacement more often than more durable brass seats.
Swing check valves have a hinged disc which swings into position, and can operate in either horizontal or vertical (upward flow) positions. Movement through the line automatically swings the disc open to allow full flow, so swing check valves must be installed with normal flow opening the disc. Should reverse flow occur, the reversed pressure and the weight of the disc closes the disc back against the seat and back-flow is stopped immediately. This type of check valve offers minimal flow restriction, allowing full flow to be achieved through the valve.
Lift check valves work automatically with horizontal line pressure as the bonnet is positioned vertically above the valve, lifting up with forward flow. Like a globe valve, with its indirect line of flow, lift check valves are flow-restricting, and so are generally used as a companion to globe valves. Line pressure lifts the disc, and flow is allowed to occur. When flow reverses, the disc falls back onto its seat and immediately cuts off the flow, preventing back-flow from occurring.