4620 & 4621

Zetco WaterMarked Stainless Steel Flanged Gate Valve

4620 & 4621 - Zetco WaterMarked Stainless Steel Flanged Gate Valve

FEATURES

  • Manufactured in China
  • WaterMarked to AS 1628 licence WM-022953
  • Stainless steel 316
  • Investment casting
  • Full bore
  • Designed to API 600 and ANSI B16.34
  • Bolted bonnet
  • External screw and yoke
  • Rising stem and non-rising hand wheel
  • Face-to-face dimensions to ISO 5752 Series 3 (ANSI B16.10)
  • End flange dimensions ANSI B16.5 150 or AS 2129 Table E
  • Not suitable for throttling applications
  • Must be operated in fully open or closed position
  • All valves pressure tested to API 598 during production
  • Size range: 25mm to 100mm
  • Also available non-WaterMarked in sizes 125mm to 200mm

 

TECHNICAL FEATURES

  • Maximum operating pressure @ nominal temperature: 362 PSI @ 100°F (2500 kPa @ 37°C)
  • For ratings at specific temperatures refer to graph overleaf

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Gate Valve FAQ

Gate valves, also referred to as sluice valves, have a barrier, the 'gate', that lifts out the path of flow. Gate valves were once the most widely used valves in industrial piping systems, however their popularity has now been replaced by ball valves.
A gate valve is operated by turning a handwheel, key cap or other mechanism which acts on a long screw thread to raise and lower the gate. Although a gate valve requires many turns to open and close it fully, the handle takes up a small amount of space compared with a ball valve which requires space for the handle to be turned.
Gate valves are not suitable for variable flow control or throttling as the seating is perpendicular or at right angles to the direction of flow. Repeated movement of the wedge (gate) near the point of closure under high velocity flow, may create a drag on the seating surfaces and causing galling or scoring on the down stream side. A slightly opened edge may cause turbulent flow with vibration and chattering of the wedge.
Gate valves are ideal for maintaining complete shutdown of a line with infrequent opening operations as the handwheel may take some time and effort to completely open the valve. Knife gate valves (with a thin rigid gate) can be used with slurries, fibres and powders that might otherwise accumulate inside a ball valve.