... Spec 6A... Structure: Gate The slab-gate non-rising-stem gate valves are available in ... sealing: New modern seal ring was provide between ... gate design.Rising stem slab gate valves are available in temperature classes L, P, R, S, T, and U specified in API 6A, or high ... gate valves. For it is designed by rising stem, the close and open of the valves is completely known .Note:Under pressure, the valve ...