... " Material:AA BB CC DD EE FF HH Standard API Spec 6A API 6A Check Valve PN 2000psi~15000psi DN 2 1/16"~71 ... CC DD EE FF HHStandard API Spec 6A Designed and Tested in Accordance to API-6A Material A216 WCB, A105, AISI 4130, Duplex SS Working ... , BB, CC, DD, EE, FF Product Specification Level PSL1, PSL2, PSL3, PSL4 Performance Requirement level PR1,PR2 Main nominal size (in ...