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  • Azbil Introduces Control Valves with Low-Emission Gland Packing that Reduces Leakage of VOC Air Pollutants

    TOKYO, Jul. 25, 2018: Azbil Corporation (head office: 2-7-3 Marunouchi, Chiyoda-ku, Tokyo / CEO: Hirozumi Sone) announced that it began to sell control valves with a low-emission gland packing system that reduces the leakage of volatile organic compounds (VOCs).

    Azbil’s low-emission gland packing system achieves the low level of leakage required by ISO 15848-1:2015*1, the only international standard for control valve gland and gasket seal performance, and it is certified to CC3, the highest endurance class, by a third-party certification organization.

    Many countries and regions, including China, Taiwan, Thailand, and the U.S., have regulations that limit the emission by industrial facilities of VOCs, which are a cause of air pollutants such as fine particulate matter (PM 2.5) and photochemical smog. These regulations place limits on the VOC leakage from control valves and require companies to control the leakage. By using control valves incorporating a low-emission gland packing system certified under ISO 15848-1, companies can more easily comply with the regulations.

    According to “Leak Detection and Repair: A Best Practices Guide,”*2 issued by the U.S. Environmental Protection Agency, the VOC leakage from valves was estimated to account for about 62 % of total VOC emissions at a typical facility, so it is very important and also efficient to reduce the leakage from control valve packing glands.

    Companies using valves with the low-emission gland packing system as a part of their environmental efforts have reported a safer working environment and less production loss due to the high-performance seal and high endurance of the packing system. As a result, demand for control valves with the high-performance seal is increasing year by year.


    1. Certified to CC3 (highest endurance class) under ISO 15848-1:2015
    The low-emission gland packing was tested by a leading third-party organization and was certified to have a seal performance meeting the requirements of ISO 15848-1:2015, as well as having the highest level of endurance (CC3 class) specified by the ISO standard. To be classed as CC3, Azbil’s low-emission gland packing system had to keep leakage under the specified level even after 100,000 cycles.

    2. Improving industrial safety and productivity
    The low-emission gland packing system can reduce fluid leakage from control valve packing glands. ? It contributes to better industrial safety at sites where foul odor is generated, or where eye-irritating fluid is handled. ? By reducing the leakage of fluid used for power or for products, it improves productivity.

    3. Longer maintenance cycle
    The system’s live-loaded packing system uses Belleville springs to continually apply the appropriate amount of force to the packing and prevent relaxation of the gland. It is especially effective for control valves that are prone to leakage, such as valves that operate frequently or valves with alternating hot and cold thermal cycles.

    Guided by the azbil Group philosophy of “human-centered automation,” Azbil Corporation delivers products that satisfy customers’ needs, providing safety, comfort, and fulfillment.

    Assembly drawing of the ISO 15848-1–compliant low-emission gland packing system

    ISO 15848-1 certificates

    *1 ISO15848-1: “Industrial valves – Measurement, test and qualification procedures for fugitive emissions – Part 1: Classification system and qualification procedure for type testing of valves.”
    *2 “Leak Detection and Repair: A Best Practices Guide” can be accessed at the following URL.

    * Posted information is accurate as of the date of announcement.