Bellow Sealed Globe Valve

Overview:

The Bellow Sealed Globe Valve is designed to provide superior sealing performance, specifically eliminating stem leakage by utilizing metal bellows as a dynamic seal. This makes it ideal for applications involving hazardous, toxic, or corrosive media where environmental and process safety is paramount. It is commonly used in industries such as chemical processing, oil and gas, pharmaceuticals, and power generation.

Product Features:

1. Material:
   • Valve Body Material: Typically made from carbon steel, stainless steel, or alloy steel to ensure durability and resistance to various media.
   • Bellows Material: The metal bellows are often constructed from stainless steel or other corrosion-resistant alloys, ensuring a long service life even under harsh operating conditions.
2. Bellow Sealing Structure:
   • Leakage Prevention: The valve features a metal bellows that acts as a dynamic seal around the valve stem, preventing leakage entirely by eliminating the traditional packing gland. The bellows are welded to both the valve bonnet and stem, creating a hermetically sealed environment.
   • Secondary Sealing: In addition to the primary bellows seal, the valve is equipped with a backup packing to ensure double sealing protection in case of bellows failure.
3. Globe Valve Design:
   • Flow Control and Shut-off: The globe valve design provides precise flow regulation, allowing the valve to be used for both throttling and full shut-off applications.
   • Rising Stem: Typically features a rising stem design for visual confirmation of valve position, providing operational clarity and control.
4. Operation:
   • Manual or Automated: Available with a manual handwheel or equipped with electric or pneumatic actuators for automatic control, making it versatile for various applications.
   • Smooth Operation: The bellow design allows for smooth operation of the valve without concerns of stem wear or leakage.
5. Pressure and Temperature Ratings:
   • Pressure Rating: Typically available in pressure classes ranging from PN16 to PN100 or ANSI Class 150 to 600, making it suitable for both low and high-pressure systems.
   • Temperature Range: Can operate in temperatures from -29°C to 450°C, depending on the materials used for the valve body and bellows, ensuring compatibility with a wide range of fluids.
6. Corrosion and Wear Resistance:
   • Material Versatility: Available in materials such as stainless steel or alloy steel, which offer excellent corrosion resistance for handling aggressive chemicals and media.
   • Durability: The bellows are designed to withstand mechanical stress and thermal cycling, ensuring a long service life even in demanding environments.
7. Design Efficiency:
   • Compact Structure: The valve is designed with a compact form factor, making it suitable for installations where space is limited.
   • Easy Maintenance: The valve is designed for easy maintenance, allowing quick access to the bellows and other internal components for inspection or replacement.
8. Sealing Integrity:
   • Hermetic Seal: The bellows provide a hermetic seal, preventing any leakage through the valve stem and ensuring that hazardous or toxic media remain contained.
   • Environmental Protection: The sealed stem also prevents external contaminants from entering the valve, enhancing the durability and performance of the valve in corrosive or dirty environments.

Applications:

1. Chemical Processing:
   • Ideal for handling hazardous chemicals, acids, and corrosive media, where preventing leaks is critical to both safety and environmental protection.
2. Pharmaceutical Industry:
   • Used in pharmaceutical production to prevent the escape of potentially harmful gases or liquids, ensuring clean and sterile process conditions.
3. Oil and Gas Pipelines:
   • Applied in refineries and petrochemical plants to control the flow of dangerous gases and liquids under high pressure, ensuring safety and operational efficiency.
4. Power Generation:
   • Used in steam lines and boiler feed systems, where high-pressure and high-temperature conditions require a leak-proof valve solution.
5. Cryogenic Applications:
   • The bellow-sealed design is well-suited for handling cryogenic fluids, ensuring no leakage even at extremely low temperatures.

Advantages:

• Zero Stem Leakage: The bellows seal prevents leakage from the stem, making it ideal for handling toxic, flammable, or corrosive media.
• Long Service Life: The durable bellows and backup packing ensure extended service life, even under extreme pressure or temperature variations.
• High Reliability: The bellow-sealed design is highly reliable and eliminates the need for frequent maintenance associated with traditional stem-sealing methods.
• Enhanced Safety: The valve’s design improves safety by completely sealing off hazardous media from the environment, making it compliant with stringent environmental and safety regulations.

Conclusion:

The Bellow Sealed Globe Valve offers unparalleled sealing performance, making it the preferred choice for industries requiring complete stem sealing to prevent media leakage. Its robust construction, wide pressure and temperature ranges, and corrosion resistance make it suitable for a wide range of applications, ensuring long-term reliability and safety in the most demanding environments.