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Gate Valve

Bellow Seal

A bellow seal valve is a type of valve designed with a flexible metallic bellows welded to the stem and bonnet. This bellows assembly forms a hermetic seal that prevents leakage of fluids, particularly toxic, corrosive, or hazardous substances, from the valve.
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Specifications

Gate Valve - Bellow Seal
Size Range

1/2 – 24 NPS, DN50 - DN600

Body Materials

Carbon Steels, Low Temperature Carbon Steel, Martensitic Steels, Austenitic Stainless Steel, Duplex Stainless Steels, Super Duplex Stainless Steels, Nickel Alloys, Nickel Aluminum Bronze, Hastelloy, Inconel, Titanium Alloy & Carbon Steel with Internal Corrosion Resistant Alloy (CRA) Overlay

Temperature Range

-29°C to 1150°C

Trim Materials

Carbon Steels, Low Temperature Carbon Steel, Martensitic Steels, Austenitic Stainless Steel, Duplex Stainless Steels, Super Duplex Stainless Steels, Nickel Alloys, Nickel Aluminum Bronze, Hastelloy, Inconel, Titanium Alloy & Carbon Steel with Internal Corrosion Resistant Alloy (CRA) Overlay

Maximum Allowable Operating Pressure

ASME 150# to 2500#

Pressure-Temprature Rating

ASME B 16.34

Construction Details

Bolted Bonnet

Body Style

Screwed, Flanged End, Butt Weld

Design Standard

API 600, BS 1414, API 6D

Flange Drilling

ASME B16.5

Testing Standard

API 598, API 6D, ISO 5208, API6FA, ISO 10497,BS6364

Face To Face

ASME B16.10

Applications

Refineries,Hydrocarbon,Energy and Process industries.

Operation

Handwheel, Gear, Actuator (Pneumatic, Hydraulic, Electro-Hydraulic and Electric Motorised)

Features:

  1. Bellow Seal Design:

    • The bellows are metallic components (often stainless steel) welded to the stem and bonnet, forming a flexible seal that expands and contracts with stem movement.
    • This design prevents the process fluid from contacting the valve stem, ensuring no leakage to the environment.

  2. Hermetic Seal:

    • Offers a leak-tight seal even in challenging conditions, preventing fugitive emissions of toxic, corrosive, or hazardous fluids.
    • Ideal for applications where environmental protection and worker safety are paramount.

  3. Protection Against Corrosion:

    • The stem and internal components are shielded from the process fluid by the bellows, preventing corrosion and extending the valve’s service life.
    • Suitable for corrosive environments in chemical processing, oil and gas, pharmaceutical, and other industries.

  4. Maintenance-Free Stem Seal:

    • Eliminates the need for packing or external seals that can wear out or require periodic maintenance.
    • Reduces maintenance costs and downtime associated with conventional packing seals.

  5. Compact Design:

    • Typically more compact than valves with external packing, making them suitable for applications with limited space or where piping layout is critical.

  6. Versatility:

    • Available in various materials including carbon steel, stainless steel, alloy steel, and exotic alloys like Hastelloy or Inconel, catering to different process fluids and environments.
    • Suitable for a wide range of temperatures and pressures depending on the material and design specifications.

  7. Applications:

    • Commonly used in industries such as chemical processing, petrochemicals, oil and gas, pharmaceuticals, power generation, and semiconductor manufacturing.
    • Ideal for applications involving toxic, corrosive, or volatile fluids where maintaining a tight seal is crucial.

Benefits:

  1. Enhanced Safety:

    1. Provides a secure seal against leakage of hazardous fluids, ensuring worker safety and environmental protection.
    2. Reduces the risk of fugitive emissions that can lead to regulatory fines or safety hazards.

  2. Reliability:

    1. Offers dependable performance and long-term sealing integrity, minimizing unplanned shutdowns or leaks.
    2. Suitable for critical applications where process integrity is essential.

  3. Cost Savings:

    1. Lower maintenance costs due to the absence of packing maintenance and reduced downtime for repairs.
    2. Long service life and durability contribute to overall cost-effectiveness.

  4. Environmental Compliance:

    1. Helps facilities meet environmental regulations by reducing emissions of volatile or hazardous fluids into the atmosphere.
    2. Supports sustainability goals by minimizing environmental impact.

  5. Operational Efficiency:

    1. Easy operation and minimal maintenance requirements contribute to operational efficiency.
    2. Provides consistent performance over time, enhancing process reliability.

FAQs:

Bellow seal valves are used in industries where preventing leakage and maintaining environmental integrity are critical, such as:

  • Chemical processing
  • Petrochemicals
  • Oil and gas refining
  • Pharmaceuticals
  • Semiconductor manufacturing

Bellow seal valves are primarily designed for on/off service due to their sealing mechanism. While they can handle some degree of throttling, they are not typically recommended for applications requiring precise flow control over a wide range.

  • They may not be suitable for applications requiring frequent cycling or extensive throttling due to the wear on the bellows over time.
  • Initial cost may be higher compared to conventional valves, but this is offset by reduced maintenance and operational costs over the valve’s lifecycle.

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