Ext. Stem Bellow seal Valve

A Ext. Stem Bellow Seal Globe Valve is a construction that is a kind of Globe / Gate Valve that seals the valve stem components using bellow.

A Bellow is contained within the valve, and the lower end of the stainless-steel / nickel alloy Bellow is welded to the stem to prevent the stem from being eroded by system fluid.

The other end is inserted between the valve's body and cover to form a permanent seal. This double seal structure prevents leakage; in the event that the bellow collapse, the stem packaging will prevent further leakage. The bellow are welded to the valve stem to provide steady operation and to eliminate valve stem vibration caused by the valve insert movement.

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Specifications

Features

End Connection: Flange (B16.5) / Butt Weld (B16.25)

Size: 15 NB - 600 NB

Pressure Rating: #150 - #900

Temperature Range: -190° C to 350 ° C

MOC: Carbon Steel / Stainless Steel / Alloy

Design Standard: MSS SP-117 / API 623 / API 600 / API 602

Cycle Life: 3000 - 5000 - 10000 Cycle

Face to Face: ASME B16.10 Rev 2009

Fire safe design: API 6FA

Testing:  API 598 Rev 2009 / ISO 15848

Documents: BS/EN 10204-3.1 REV 2019

  1. No Bellow Torsion.
    The non-rotating stem prevent Bellow Torsion and guarantees high cycle life on all Bellow-Seal Valves.
  2. Bellow with long cycle life.
    Designed for High pressure/temperature applications and successfully tested as per MSS SP-117 / API 598.
  3. Minimal Torque.
    Because of the non-rotating stem, a central grease fitting is used to lubricate the stem nut and, for high-pressure valves, a stem thrust bearing.
  4. Stem / Gland Seals
    a. When open, the backseat (stem bevel) guards against line pressure.
    b. Gland Packing (Graphite / PTFE)
  5. Zero Maintance Operating and maintenance costs are significantly decreased as a result of the longer service life.
  6. Hermetic Sealed (100% Emission Free).
    In most designs, Body-Bonnet welds create a hermetically sealed vessel. (As per requirement)

FAQ’s

Have a question before you buy our products? Take a look at the FAQs below.
If you don’t find the answer you’re looking for, get in touch with us here.

  • What are Bellow Seal Valves?

    Bellows Seal Valves are specialized valves designed to prevent leakage by incorporating a flexible bellows element. The Bellow, made of metal or other materials, provides a barrier against fluid leakage, making these valves ideal for applications requiring zero or low emissions and environmental safety.

  • What makes Freture the best manufacturer and supplier of bellow sealed valves?

    At Freture, our unwavering dedication lies in delivering exceptional quality and ensuring utmost customer satisfaction. 
    Our valves feature precision-finished seats and surfaces, guaranteeing optimal performance. 
    With a zero fugitive emission rating (Class "A") and undergoing rigorous helium leak tests, our valves excel in environmental safety. 
    The fire-safe design adds an extra layer of protection, while their suitability for vacuum service makes them versatile. 
    Our valves also offer easy replacement and incorporate additional measures for odor and safety enhancement.

  • How does a Bellow Seal Valve work?

    The bellows element in the valve expands and contracts with the movement of the valve stem, ensuring a tight seal even in challenging conditions. This design eliminates the need for external packing and minimizes the risk of leaks.

  • What are the benefits of using Bellow Seal Valves?

    Bellow Seal Valves provide excellent leak-tightness, reduced fugitive emissions, and improved safety. They are suitable for applications involving corrosive, toxic, or high-temperature fluids.

  • Can Bellow Seal Valves handle high pressures and temperatures?

    Yes, bellows seal valves can be designed to handle a range of pressures and temperatures. It's important to select the appropriate bellows material and valve design based on the specific operating conditions.

  • Can Bellow Seal Valves be used for both on-off and throttling applications?

    Yes, bellows seal valves can be used for both on-off and throttling applications. Their reliable sealing capability makes them well-suited for isolation as well as precise flow control.

  • Can Bellow Seal Valves be automated?

    Yes, Bellow Seal Valves can be automated using various types of actuators, such as electric, pneumatic, or hydraulic. Automation allows for remote control, integration into control systems, and enhanced safety.

  • How do I maintain a Bellows Seal Valve?

    Regular inspection and maintenance are essential to ensure the longevity of bellows seal valves. Check the condition of the bellows, ensure proper sealing, and follow manufacturer recommendations for cleaning and maintenance.

  • Are Bellow Seal Valves repairable?

    In some cases, damaged or worn bellows can be repaired or replaced by experts. Proper handling and maintenance can help extend the life of bellows seal valves and minimize the need for repairs.

  • Why is Freture the best place to buy Bellow Seal Valves from?

    Most of the time our clients are local hence we are easily accessible

    Our products are manufactured & Tested as per international Std. & we offered only best quality product

    We will keep stock of Std. Product for last minute urgency

    We provide products only from reputed & highly reliable manufactured

    We have an experienced technical team who will be able to understand client’s exact requirements & accordingly we will offer solutions

  • Are Bellow Seal Valves safe?

    Bellow Seal Valves are designed to eliminate leakage. Industries that use Bellow Seal Valve are high-risk ones and therefore, safety is one of the most important aspect. Bellow Seal Valves are considered to be one of the safest variety of valves used. To assure our customers, Bellow Seal Valves by Freture come with a 36 month warranty.

  • Do I really need a Bellow Seal Valve for my factory?

    If you are in one of the following industries, a Bellow Seal Valve will definitely help you improve the efficiency and safety.

    • Oil and Gas Industry
    • Natural Gas Industry
    • Synthetic
    • Paper and Pulp
    • Chemical
    • Petro-Chemical
    • Textile

    If you’re from another industry looking for more details about how you can benefit from using a Bellow Seal Valve, please get in touch with us here for further discussion.

  • How do I know which type of Bellow Seal Valve is ideal for me?

    Get in touch with us here and an expert from Freture Techno will help you decide.

Industries where Bellow Seal Valve is Used

Oil and Gas Industry
Natural Gas Industry
Synthetic and Textile
Paper and Pulp
Chemical & Petro-Chemical

Applications of Bellow Seal Valve

  • Works well in high pressure and high temperature environments
  • Designed to eliminate leakage
  • Reliable in supply of highly volatile liquid/fluids
  • Damage-proof

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