DL mud pump valves & seats: 1.stem-guided&three-wing,four-wing valves 2.full-open,three/four-arm seats 3.API standard ... Valve and Seat,Three-wing Valve,Four-wing Valve,Full-open Seat,Long-life Bonded Valve with Urethane.Wide choices are ... hardened or stainless steel valves and elastomer- valve seats. mud pump full open valve assy