One more fire-safe packing is delivered at the seat ring for interior leakage prevention to the body cavity. The graphite packing rings are compressed and held in position with the gland flange, which is bolted for the stem housing. Residential and Industrial Plumbing: Ball valves will also be used in https://s15293.wikipublicist.com/5250176/the_2_minute_rule_for_stainless_steel_fittings