Butterfly valve Strictly made in the standard of API; Offer OEM ... as:ZJ30,ZJ40,ZJ50,ZJ70,ZJ90 Mud pump, Hook, Rotary Table, Swivel, Crown block, Travelling Block …All the products are ... properties, Flaw detection and other Quality Report for Valve box, case, crank, shaft, large gear ring.About Service:1.In general ... please feel free to send us your inquiry. Mechanical part,Butterfly valve,Pump part