1) Size: 2" - 40"
2) Class: 150lbs - 600lbs

Technical standards:
1) Design and manufacture: API 6D
2) Face-to-face: ANSI B16.10
3) Flange end: ANSI B16.5
4) Inspection and test: API 598

Main materials:
1) Body and bonnet: Cast iron, ductile cast iron, WCB, WCA, WCC,
A351, 304, 340L, 316, 316L, 17-4PH
2) Piston jar: Stainless steel - A351, 304, 340L, 316, 316L, 17-4PH
3) Piston seat: Cast iron, ductile cast iron, WCB, WCA, WCC, A351
4) Seat and disc: WCB, WCA, WCC, A351, A744
5) Stem: Stainless steel