Gate, Globe and Check Valves are widely used in all process industries. They can be found in Refineries, Chemical Plants, Pulp and Paper Mills, Power Generating Plants as well as other industries whose processes require positive flow control.

However, it is Refineries and Chemical Plan processes that frequently include Volatile Organic Compounds (VOCs) that have caused the greatest concern to the safety of our environment. It is the emission or leakage of these Volatile Organic Compounds into the atmosphere from different sources such as gas turbines, boilers and valves that has led to the enactment of the "Clean Air Act" in North America and the “TA Luft" regulation in Europe. These regulations set limits on the amount of allowable VOC emissions form any source and/or installation.

The State of California in the USA currently has established the most restrictive limit of 100 ppm with further reductions in the limit pending.

The industry quickly recognized that the large number of valves in a Refinery or Chemical Plant represented one of the largest Sources of these VOC "fugitive emissions" and conversely, the potential for effective reduction in VOC fugitive emission.

Committed with the social responsibility, Walworth achieves and exceeds this restriction with 50 ppm in average per valve.

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