Last month, this company introduced the PV4 and PV6 piston valves (photo) for isolation purposes. They are available in NPT and SW versions, in sizes from½ to 2 in., in either forged carbon steel or forged stainless steel. These valves are designed to Class 800 and provide tight shutoff. They are suitable for steam, condensate and other liquid systems. The highly reliable and robust PV4 and PV6 have been rigorously tested and developed for use in the oil, gas and chemicals industries, where they are considered an industry standard for the isolation of steam, condensate and process media. — Spirax Sarco, Inc., Blythewood, S.C.