DIDLINK wafer Dual Plate Check Valves designed and manufactured strictly to International Standards API 6D, API 594, ASME B16.34 or Equivalent. Standards Compliance and Design Features: » Design & Manufactured to API 6D, API 594, ASME B16.34 or Equivalent » P.T Ratings to ASME B16.34 » Face to Face Dimensions to ASME B16.10 » Flanged Ends to ASME B16.5 » Butt-weld Ends to ASME B16.25 » Valves Marking to MSS SP-25 » Inspect & Tested to API 598 » Size Ranges from 1/2” thru 60”. » Structured in One Piece Union Body » Pressure Ratings from Class 150 to Class 2500, PN16 to PN420 » Ends Connections in Flanged R.F or RTJ, Wafer, Fully Lugged and Grooved » A variety of body and trim material is offered, including carbon steel ASTM A216 WCB, WCC; Cast or Ductile iron A126, GG25, A536 or GGG50, Low Carbon Steel LCB, LCC, Alloy Steel WC6, WC9, C5, Stainless Steel CF8, CF8M, CF3, CF3M, Duplex & Super Duplex Steel A890 GR.4A,5Aor F51, Special Materials in Monel, Alu. Bronze C95800, 95600 etc. Coatings may be provided for added corrosion or wear resistance. Hard-facing and weld overlays may also be supplied. Seats Options with metal-to-metal or bubble-tight resilient. » Optional Bypass system & Counter-weight Assembly. The corporate upholds the philosophy of "Be No.1 in quality, be rooted on credit rating and trustworthiness for growth", will proceed to serve aged and new buyers from home and abroad whole-heatedly for Hot Sale for China Class 150lb 300lb Welded Flange Swing Check Valve, Welcome to visit our firm and factory. Be sure to come to feel free to get in touch with us in case you need any additional assistance. Hot Sale for China A105 Swing Check Valve,  A105n Swing Check Valve, We have been in operation for more than 10 years. We have been dedicated to quality products and consumer support. We currently own 27 product utility and design patents. We invite you to visit our company for a individualized tour and advanced business guidance.