Gate Valve


  • Gate valve is characterized by a sliding wedge which is moved by actuator perpendicular to the flow direction. There are a variety of valve sizes and types. The valve is used primarily as a stop valve to open or close fully. Normally it works for slurries, viscous fluid, etc, but not for throttling. The gate valve usually has a minimum pressure drop in full open and a tight seal in full close, and therefore there is little possibility that contaminants may enter the valve.
  • Pressure Seal Bonnet type
  • A flexible wedge is a one piece and fully guided cast with a central hub allowing the seating faces to move reciprocally and thus compensating for the distortion on body seats due to thermal expansion or pipe loads. Seat ring and wedge seating face are set to 9 degree angle from the vertical to minimize the sliding contacts between wedge and seat ring while opening or closing them. Wedging helps lead to a tight seal in a low differential pressure service. A flexible wedge resists wedge sticking or binding in a service. The wedge may be closed in a hot condition and opened in cold. The seating surface are stellited to provide high cycle capability in a very high differential pressure service.
  • Service Features
    • Several trim combinations available for various services.
    • Straight-through port design offering a good flow with minimum frictional loss and turbulence.
    • Cast steel Valve suitable for works demanding strength, shock resistance, elongation and heat resistance.
    • Bottom seating of seat rings ground accurately for maximum strength and tightness(globe).
    • Bypass mounting to equalize pressures.
    • Normal yoke bushing furnished with ductility resistant to high melting point of above 2200°F.
    • Level and weight available to accelerate/decelerate disc closing (swing check).
    • Designed for maximum flow with minimum pressure drop if possible.
    • Precision-ground seating surfaces and revolving disc providing a long life.
  • Production Materials
    • Carbon Steel
    • ASTM A216-WCB or Equivalent
    • Alloy Steel
    • ASTM A217-WC6, WC9, C5, C12, C12A or Equivalent
    • Stainless Steel
    • ASTM A351-CF8, CF8M, CF3, CF3M, CN7M, or Equivalent
    • Duplex Stainless Steel
    • ASTM A995-1A, 2A, 4A, 5A or Equivalent
    • Special Alloy Steel
    • Inconel 625, Incoloy 825, Hastelloy C, Monel, AL-BRONZE
    • ASME SA designation material(e.g ASME SA217-WC6)
  • Cast Steel Valves Production Range
  • Type / Class 150 300 600 900 1500 2500
    GATE BB 2"~36" 2"~36" 2"~30" 2"~24" 2"~24" 2"~12"
    PSB 2"~24" 2"~24" 2"~16" 2"~12"
    GLOBE BB 2"~12" 2"~12" 2"~12" 2"~12" 2"~12" 2"~12"
    PSB 2"~16" 2"~16" 2"~14" 2"~10"
    SWING CHECK BC 2"~36" 2"~36" 2"~30" 2"~24" 2"~24" 2"~24"
    PSC 2"~24" 2"~16" 2"~14" 2"~12"