Standards compliance: 1. Design and Manufacture: GB/T12236 2. Test abd inspection: JB/T9002 Temperature: -29~550℃ PN: 16~25Mpa Size: 50~600mm Medium: water, oil, steam and other acid medium Material: WCB, CF8, chrome molybdenum steel Characteritics 1. The products feature a reasonable structure, reliable seal, good performance and nice modeling. 2. Either soft or hard seal can be selected for the product upom different working condition. Co hard alloy welded sealing surface, which is wearing resistant, erosion proof, abrasion proof and longlived. 3. Small opening pressure, the disc can be opende fully with a very small pressure differential 4. Inside-set bolt-bearing structure reduces leakage and reliable use. 5. There is backward sealing structure in the valve, so the sealing is reliable. 6. Middle cavity uses a self-tightening sealing structure to have the sealing performance reinforced along with the pressure rises so as to ensure the sealing performance.