Seat replacement is a simple operation. The cavity and seat sidewalls are symmetri-callydesigned to permit, confine and direct movement of theseat to the disc to dynamically seal with line pressure in thereverse direction. The disc edge is the segment of a sphere, andthe seat is angled towards the disc edge to seal with pipelinepressure in either direction. Shaft design which utilizes a lower packing seal in the valve body to prevent external leakage. The component parts are of the same design used in the packing assembly in the top of the valve body neck.
Solid shaft provides alignment and rigid support for disc.
Separate part from gland flange, preventing uneven load distribution against packing. ANSI B16.34 design in either wafer or lug configuration. Applies load against packing gland to prevent external leakage.