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Valve Safety

Engineered to reduce the risk of fugitive emissions and to withstand fire

Fugitive Emissions Control

Most pipeline and process plants must adhere to strict legislative and safety requirements (such as ISO 15848-2) regarding fugitive emissions. Under these conditions, leaks to atmosphere—no matter how small—can grow into large concerns. The monitoring and control of these emissions have become a major focus for plant operators. Whether satisfying environmental, legislative or industry guidelines of agencies such as the EPA, ASME and others, all valves must meet clearly defined requirements to handle the most common valve leak areas: stems and body gaskets.

Safety isn’t expensive. It’s priceless. And it’s built into all our products.

MOGAS has engineered stem and body gaskets to reduce the risk of unanticipated emissions. Our ball valves have two independent stem seals, as well as special body gaskets, to ensure reliable sealing.


Stem Seal Design

A special safety feature is the stem seal design. MOGAS incorporates independent stem seals which include:

  • pressure-energized and mate-lapped stem seal bearing
  • stem packing that uses two anti-extrusion rings and three application-specific packing rings
  • optional lantern rings, piped to a detector
  • live loading system
Pressure-Energized Gasket

MOGAS offers a pressure-energized delta ring gasket for high-pressure applications. This solid metal, tapered ring combines high surface loading with the strength of the seal material to provide considerable stored energy and tight sealing—even in systems where vibration or thermal cycling might weaken other sealing components, leading to potential leak paths.

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    Safety Integrity Level (SIL) certified

    A SIL is a measure of a safety system’s performance, in terms of probability of failure on demand. MOGAS C-Series severe service ball valves have been reviewed by Exida—a certification and research firm specializing in critical safety systems and related equipment—and have received a certification for certain failure rates based on the severe service applications that MOGAS isolating ball valves have been operating in over the past 40 years.

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    Fire tested for dependable performance

    The operation of valves, while in the midst of flames and extreme heat, is a significant part of any plant’s safety program. MOGAS ball valves are designed to withstand the punishing effects of emergency fire situations.

    Several sizes and ASME classes of MOGAS valves have been fire tested and qualified to meet the stringent requirements of industry standards and specific end users. Whether API standard or a customer’s particular fire test specifications, MOGAS works with end users to ensure all testing procedures are adamantly followed. After the burn is completed, both the operability and the performance of the valve are evaluated. When fire testing is complete, all documentation and certifications are available for review.

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    Category M for lethal fluids

    Category M for Lethal Fluids, per ASME B31.3 code, is defined as “a fluid service in which a single exposure to a very small quantity of toxic fluid, caused by leakage, can produce serious, irreversible harm to persons on breathing or bodily contact, even when prompt restorative measures are taken.” MOGAS metal seated ball valves have operated successfully for years in critical Category M applications such as acetic anhydride, phosgene gas and supercritical CO2 systems.

    A special requirement of this code is the stem seal design. MOGAS has addressed this requirement by providing independent stem seals which include:

    This MOGAS design meets all requirements of Category M specifications, without the use of expensive and high maintenance bellow seals—which have a limited cycle life.
    • pressure-energized and mate-lapped stem seal bearing
    • stem packing that uses two anti-extrusion rings and three application-specific packing rings
    • optional lantern rings, piped to a detector
    • live loading system