Class 150~1500 Cast Steel Gate Valve Features:- * OS&Y, Rising stem, Flexible Wedge * Bolted Bonnet, Threaded or welded seat ring * ASTM A216 WCB, A217 WC6, A351 CF8, A351 CF8M, * A351 CF3, A351 CF3M, A351 CN7M Standards compliance * Design and Manufacture: ANSIB16.34, API600, API6D, API603, BS1414 * Face to face (end to end): ANSIB16.10, API6D * Flanged connection: 2"~24"to ANSIB16.5, 22", 26"~36"to MSS-SP-44 to API605 on Request * Test and inspection: API598, API6D * Butt welded end: ANSIB16.5 A. Anti-friction ball thrust bearing: Reduces friction between mating parts to ensure smooth operation B. Grub screw: Secures yoke nut in the bonnet C. Grease nipple: Supplies lubricant to the mating parts