we have many qualified engineers in valves, pipe line, fittings, well head equipment, tubing & casing, drilling collar, drill pipes, tool joint, sub stem joint, sucker rod, sucker rod pump, pump unit, etc. petroleum equipment. We are very familiar with the API, and ASME, ASMT, AWWA£¬DIN and BS standards etc. We have a lot of experiences in design area, manufacture process, quality control in the valves, pipe line, fittings, well head equipment, tubing & casing, drilling collar, drill pipes, tool joint, sub s...
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