... all kind of check valves,strainer and flange All kind of check valves, strainer and flange. Check valves Specifications: 1) ... 4)Standards: A)Design and manufacture: BS 1868/API6D B)Inspection and Test: API598 C)Flange connection: ANSI B16.5 ... 2) Pressure class: 150 - 1,500lbs 3) Type: slip on, welding neck, blind, plate, socket welding, threaded etc.4) ... : DIN/UNI/BS/JIS valves,strainer and flange