GB Cast Ductile Iron Rising Stem Gate Valve

Strictly engineered in compliance with GB/T 12232 and GB/T 17241.6 standards, this GB cast ductile iron rising stem (OS&Y) gate valve is a premier solution for high-reliability fluid isolation in industrial and municipal piping networks. The valve body is precision-cast from high-strength QT450-10 ductile iron, offering exceptional compressive strength and ductility to effectively absorb mechanical stresses and thermal expansion loads within the system. The specialized Outside Screw and Yoke (OS&Y) configuration isolates the stem threads from the process media, preventing erosion and corrosion while providing clear, visual indication of the valve’s position through the vertical displacement of the stem. Its core sealing mechanism utilizes a fully encapsulated resilient wedge paired with a precision-machined flat-bottom flow path, ensuring bi-directional, bubble-tight shut-off and eliminating sediment accumulation. Complemented by a high-build, food-grade electrostatic epoxy resin powder coating, the valve delivers superior corrosion resistance while safeguarding the purity of the conveyed media—such as potable water, HVAC cooling water, and neutral fluids—making it an ideal choice for urban water supply, fire protection, industrial water treatment, and sewage systems.

DescriptionValueUnit
Nominal Pressure (PN)16
DN50–400mm
Test Pressure: Shell Test Pressure2.4MPa
Test Pressure: Seal Test Pressure1.76MPa
Test Pressure: Air Test Pressure0.6MPa
Suitable Temp.≤ 120
Suitable MediumWater, Steam, Oil (W.A.O)

Structural Characteristics of

  • The Rising Stem configuration ensures that the stem’s vertical position directly reflects the valve’s degree of openness. This allows operators to visually confirm the flow status from a distance, preventing accidental operations and eliminating seat damage caused by over-tightening common in non-rising designs.

  • Utilizing premium QT450 Ductile Iron, the body exhibits superior elongation and impact resistance, enhancing the system’s resilience against pressure surges or water hammer effects. This material effectively mitigates fracture risks in complex soil subsidence scenarios, providing a reliable foundation for industrial water supply and fire protection networks.

  • The stem threads are housed on an external yoke, isolating them from the internal flowing media. This layout prevents erosion of the driving threads by impurities or corrosive fluids, maintaining long-term lubrication and ensuring smooth, effortless operation even within high-capacity piping networks.

  • The valve surfaces undergo a uniform electrostatic powder coating process, creating a dense blue protective barrier that shields the iron substrate from atmospheric oxidation. This industrial-grade finish is not only aesthetically professional but also extends the valve’s service life in damp pump rooms or outdoor installations, lowering maintenance cycles.

  • The internal flow channel features a flat-bottom seat design, eliminating the common issue where sediment or debris collects at the base and hinders a tight seal. Coupled with a fully encapsulated resilient wedge, it expels or absorbs minor particles during closure to maintain bubble-tight shut-off, ensuring total system integrity.

Main Components Material

NOPartMaterials
6BonnetQT450-10
5Stem2Cr13
4Screw6.8
3ShimNBR
2DiscQT450-10+EPDM
1BodyQT450-10

Class 150LB Main Connection Dimensions

DNLDKdCfn-Φ
501751651251021824-Φ18
651851851451222024-Φ18
801952001601382028-Φ18
1002252201801582228-Φ18
1252452502101882228-Φ18
1502552852402122428-Φ22
20028534029526826212-Φ22
25032540535532029212-Φ26
30035046041037832212-Φ26
35038552047043035216-Φ26
40039758052549038216-Φ30

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