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January 08, 2026
Category Connection: Control Valve
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Tags:
#Modulating Control Valve #Pneumatic Diaphragm Control Valve #Pneumatic Control Valve
Brief: Want to know how a pneumatic double-seated control valve operates and why it's ideal for high-pressure applications? This video provides a detailed walkthrough of the SONGO Pneumatic Double Seated Valve, showcasing its internal structure, working principle, and a comparison with single-seat valves. You'll see how its dual spool design handles large pressure differences and learn about its application in industries like petroleum, chemical, and power generation.
Related Product Features:
  • Features a double-seated design with two spools for balanced force and high operating pressure differentials.
  • Constructed with SS304/316/316L materials for durability in harsh conditions.
  • Equipped with a 4-20mA pneumatic positioner for precise control and accurate flow characteristics.
  • Offers a large rated flow coefficient, approximately 20-25% higher than single-seat valves of the same diameter.
  • Suitable for a wide temperature range from -20°C to 230°C, with options for cryogenic and high-temperature applications.
  • Available in multiple nominal diameters from DN32 up to DN200, with various pressure ratings including PN16 to PN100.
  • Complies with GB/T 4213-2008 standards, ensuring low intrinsic error and hysteresis with positioner.
  • Designed for applications with less strict leakage requirements and clean media in industrial control systems.
FAQs:
  • What is the main difference between a pneumatic double-seat control valve and a single-seat control valve?
    The double-seat valve has two spools, allowing for a larger flow capacity and reduced unbalance force, making it suitable for high pressure differentials. However, it typically has higher leakage compared to a single-seat valve.
  • What materials are used in the construction of this valve for corrosive environments?
    The valve body, bonnet, spool, and seat are available in corrosion-resistant materials like CF8 (SS304), CF8M (SS316), and CF3M (SS316L) to handle harsh media.
  • How does the pneumatic actuator function in this control valve?
    It uses a diaphragm actuator that can be direct-acting (air to close, fail open) or reverse-acting (air to open, fail closed), controlled by a 4-20mA positioner for accurate modulation.
  • What industries are these pneumatic double-seated valves commonly used in?
    They are widely applied in petroleum, chemical, pharmaceutical, metallurgy, and power plant industries for controlling gases, liquids, and steam.
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