... ApplicationPetroleum, chemical, power, gas, metallurgy, shipbuilding,construction, etcTypeSlip-On, Welding Neck, Blind, Socket Welding, Threaded and Joint etc. ... Note: We have our own factory, could offer the products with good quality and competitive price.We Liaoning ... /9CE/1997, third-grade metering, the People's Republic of China on the Administration of Production License for industrial products ...