large volume and wide variety of hazardous and toxic materials are currently in use. Coupled with increasingly stringent regulatory requirements positive containment and control measures have become mandatory. Bell-O-Seal Valves are well qualified to provide technological assistance for applications involving hazardous and difficult to- handle fluids and gases. Bell-O-Seal engineers combine more than 20 years of experience in valve design and development with expertise in metallurgical techniques. Their strategic use of Special materials and other high performance metals makes Bellow Seal Valves the optimum choice worldwide for a broad range of applications. The exceptional versatility, superior operating characteristics, robust construction and consistent dependability of Bell-O-Seal Valves have won us widespread acceptance across the industry, especially chemical and hydrocarbon processing industries