BALL VALVES :: SUB - SEA MMVI is glad to show you its range of ball valves SUB-SEA. - Size: from 2'' to 24'' - Rating: from ANSI 150 to ANSI 2500 - Materials: duplex stainless steel, nickel alloy (and others); - Types of end connection: flanged end, buttwelding end, ring joint end; - Soft and metal to metal seals; - Applications: Specially designed for off-shore and deep water applications. Due to the severe service conditions the valve has to withstand, and in order to assure high reliability, improvements are made on its structure and operability, with increased wall thickness and stem diameter. Considering the external pressure, additional secondary gaskets are fitted in order to prevent seawater entry into the cavity. Better performance is obtained by using tungsten carbide coating in metal to metal sealing between seat and ball. Sub-sea valves can be manually operated or fitted with actuators.