Split Wedge:

Split wedge gate valves, as displays in Figure are of the ball and socket design. Those are selfaligning and self-adjusting to both seating surfaces. A disk is free to adjust itself to the seating surface if one-half of the disks are slightly out of alignment since of foreign matter lodged among the disks half and the seat ring. That category of wedge is appropriate for handling noncondensing gases and liquids at normal temperatures, mainly corrosive liquids. Freedom of movement of the disk within the carrier avoids binding even by the valve might have been closed while hot and later contracted due to cooling. This category of valve should be installed along with the stem within the vertical position.

Figure: Split Wedge Gate Valve