Hemiwedge Valve Corporation”s Hemiwedge Cartridge Valve features a patented mechanical-seal design for critical service applications. The valve utilizes aspects of ball valves, gate valves, and even triple-offset butterfly valves to protect the sealing surface during valve operation. A tapered hemispherical closure member (the hemi) rotates around a fixed core and wedges into a fixed seat to affect a mechanical seal. The closure member is rotated a quarter-turn by a valve stem, which may be operated manually with a wrench or gear operator or automatically with a pneumatic, hydraulic, or electric actuator. Unlike designs with a rotating ball or plug, the valve features a constant fixed core within the body to provide protection of the seating surfaces when the valve is opened, as well as minimizing turbulence as the valve is either opened or closed. This constant fixed core directs the fluid through the valve and not at the seats during the opening and closing of the valve. The line features an all-metal seat design that provides valve closure tightness to ISO 5208:2008 Rate B. Hemiwedge cartridge valves are designed in accordance with ANSI B16.34 and are also available with API 6D certification. They are available in sizes from two inches to 10 inches and in ANSI Classes 150 to 900 Class and other sizes are currently in development. The valve is available in carbon steel, low alloy steels, stainless steels, and other materials such as duplex stainless steel, superduplex stainless steel, Inconel, Hastelloy, and Monel.