API standard Cast steel Check Valve 
Design description:
Straight pattern body design, Bolted Bonnet or Pressure seal bonnet, renewable Seat Ring, 
Horizontal or Vertical Service, Swing type, Anti-rotation disc
Ends: Flange or Butt Welding
Body material:  WCB, LCB, CF8, CF8M, CF3, CF3M, WC6, WC9, C5, C12 or Equivalent, Available also in low temperature steels, low alloy steels, stainless steels, duplex type stainless steels and other exotic materials; Various trim materials available to suit service conditions
Trim material: 1#,5#, 8# etc.
Pressure Rating:Class 150,Class 300,Class 600,Class 900,Class 1500
Size range: 2" to 48" 

Applicable standards:
Design standard: BS1868/API6D
Face to face:  ASTM/ANSI B16.10
Flange ends: ANSI B16.5
BW ends: ANSI B16.25
Inspection and test: API 598/API6D
Pressure-Temp:  ASTM/ANSI B16.34