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Globe Valve

Bellow Seal

Bellow seal globe valves are specialized valves designed to provide enhanced sealing capabilities and reliability in demanding applications.
Bellow Seal globe valve

Specifications

Globe Valve - Bellow Seal
Size Range

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

Flanged End, Butt Weld

Design Standard

BS 1873, API 623

Flange Drilling

ASME B16.5

Testing Standard

API 598, ISO 5208, BS 6364

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:
  • Bellow Seal Design:

    • Feature: Incorporates a metallic bellow (often stainless steel) as part of the stem assembly.
    • Benefit: Provides a secondary seal that isolates the stem from the process fluid, preventing leakage and ensuring no contact between the fluid and the stem.
  • Globe Valve Configuration:

    • Feature: Typical globe valve design with a spherical body and a disc (or plug) that moves perpendicularly to the flow path.
    • Benefit: Allows for effective throttling and control of flow rates, suitable for applications requiring precise regulation.
  • Secondary Sealing Mechanism:

    • Feature: Besides the bellows, utilizes packing or gland packing to further enhance sealing.
    • Benefit: Ensures tight sealing under varying pressures and temperatures, enhancing valve integrity and operational safety.
  • Forged Construction:

    • Feature: Often constructed from forged materials such as stainless steel, carbon steel, or alloy steel.
    • Benefit: Provides strength and durability to withstand high pressures and temperatures, maintaining reliability over extended periods.
  • Yoke and Bonnet Assembly:

    • Feature: Designed to accommodate mechanical loads and thermal expansion.
    • Benefit: Ensures stability and reliability in diverse operating conditions, contributing to long-term performance.
  • Variety of End Connections:

    • Feature: Available with flanged, butt-weld, or socket-weld ends.
    • Benefit: Offers flexibility in installation and compatibility with different piping systems and configurations.
  • Actuation Options:

    • Feature: Can be manually operated or equipped with actuators (electric, pneumatic, hydraulic).
    • Benefit: Allows for remote operation and integration into automated control systems, enhancing operational efficiency.

Benefits:

  • Zero Stem Leakage: The bellow seal isolates the stem from the process fluid, preventing leakage along the stem.
  • Enhanced Safety: Provides a reliable sealing solution suitable for toxic, corrosive, or hazardous fluids.
  • Long Service Life: Robust construction and effective sealing mechanisms contribute to extended service intervals and reduced maintenance requirements.
  • Precise Control: Globe valve design allows for precise throttling and control of flow rates, supporting accurate process control.
  • Versatility: Suitable for a wide range of applications in industries such as chemical processing, petrochemicals, power generation, and pharmaceuticals where sealing reliability is critical.

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