Proudct Features 1.Unique stem hole design in the disc ensures a dry stem journal 2.360 degree polished disc assures positive on-off 3.Long service life, standing the test of tens thousands opening/closing operations 4.Bubbles-tight sealing with no leakage under the pressure test 5.Wide selection of materials , applicable to various medium Operation type Lever,Gear, Electric actuator,Pneumatic actuator,Bare stem Standard Design and Manufacture:API 09 Inspection and Test:API 598 End flange dimension:ASME B16.5,ASME B16.47(API 605 ,MSS SP44) Butt weld end dimension:ASME B16.25(BW) Face to face:API 609 Pressure-temperature ratings:ASME B16.34 NACE: NACE 0175 Material ASTM A216 WCB WCC;ASTM A217 WC1 WC6 WC9;ASTM A351 CF8,A351 CF8M, A351 CF3,A351 CF3M,A351 CN7M;.ASTM A352 LC1 LCB LCC LC3(Cast Steel, Alloy Steel, Stainless Steel, Special Steel) According to the customer's required.