... duty oilfield applications. WP 2000-5000 API 6A OTECO mud valve JEFA mud gate valve deliver reliable performance in heavy duty oilfield ... .488.9-279(BWXXS)24210055060Shanghai JEFA Machinery co.,ltd1) Wellhead and Christmas tree (casing/tubing head, casing /tubing ... , tree cap etc)2) Valve (FC/FLS gate valve, expanding gate valve, Slab gate valve ,chock valve, check valve)3) Bop(Annular/Ram BOP)If ...