What are the standards for fittings and valves?

Let’s learn *this first: ASME standards for pressure pipelines and fittings, Series B31 and B16

HG20537.1 Specifications for the selection of welded austenitic stainless steel pipes; HG20553 Series of dimensions for seamless and welded steel pipes used in chemical piping; HG/T21634 Welded fittings made of forged steel; HG/T21635 Butt-welded fittings made of carbon steel and low-alloy steel; HG/T21631 Seamed butt-welded fittings made of steel; HG/T21632 Welded, threaded, and butt-welded pipe fittings made of forged steel; HG/T21637 Filters for chemical pipelines; HG/T21577 Quick-special connectors; HG20592~20605 Steel pipe flanges (European system); HG20615~20626 Steel pipe flanges (American system); HG20606~20612 Gaskets for steel pipe flanges (European system); HG20627~20633 Gaskets for steel pipe flanges (American system); HG20613 Fasteners for steel pipe flanges (European system); HG20634 Fasteners for steel pipe flanges (American system); SH3401 Asbestos-rubber gasket plates for pipe flanges; SH3402 PTFE-coated gaskets for pipe flanges; SH3403 Metal ring gaskets for pipe flanges; SH3404 Fasteners for pipe flanges; SH3405 Dimension series for steel pipes in petrochemical enterprises; SH3406 Steel pipe flanges for petrochemical applications; SH3407 Spiral-wound gaskets for pipe flanges; SH3408 Butt-welded seamless steel fittings made of steel; SH3409 Butt-welded fittings made of steel plates; SH3410 Welded fittings made of forged steel; JB/T74 Technical requirements for pipeline flanges; JB/T75 Types of pipeline flanges; JB/T79.1~79.4 Integral cast steel pipe flanges; JB/T81 Plate-type butt-welded steel pipe flanges; JB/T82.1~82.4 Butt-welded steel pipe flanges; JB/T83 Butt-welded ring-type loose-flange steel pipe flanges with pressures of 0.25, 0.6, 1.0, 1.6, 2.5 MPa; JB/T84 Concave-convex face butt-welded ring-type loose-flange steel pipe flanges with pressures of 4.0, 6.3, 10.0 MPa; JB/T85 Flanged loose-flange steel pipe flanges with flanging, for pressures of 0.25, 0.6 MPa; JB/T86.1~86.2 Covers for steel pipe flanges; JB/4700～4703 Flanges for pressure vessels; JB/T87~90 Gaskets for pipeline flanges; JB4704~4706 Gaskets for pressure vessels; GB12459 Butt-welded seamless steel fittings made of steel; GB/T13401 Butt-welded fittings made of steel plates; GB/T14626 Threaded fittings made of forged steel; GB/T14382 Three-way filters for pipelines; GB/T14383 Welded fittings made of forged steel; GB/T9112~9124 Steel pipe flanges; GB4622.1~3 Spiral-wound gaskets for pipe flanges; GB9126.1~4 Asbestos-rubber gaskets for pipe flanges; GB9128.1~2 Metal ring gaskets for pipe flanges; GB/T13404 PTFE-coated gaskets for pipe flanges; GB/T15601 Metal-coated gaskets for pipe flanges; GB30 Hex bolts; GB52 Hex nuts; GB56 Hex thick nuts; GB901 Equal-length double-ended studs, Grade B; GB6170 Type I hex nuts, Grades A and B; GB6171 Type I hex nuts, fine thread, Grades A and B; GB6175 Type II hex nuts, Grades A and B; GB6176 Type dish hex nuts, fine thread, Grades A and B; GB12220 General valves – Marking; GB12221 Metal valves connected by flanges – Structural length...; GB12224 General requirements for steel valves,...; GB12234 General valves – Steel gate valves connected by flanges or butt welding; GB12235 General valves – Steel globe valves and lift check valves connected by flanges; GB12236 General valves – Steel swing check valves connected by flanges; GB12237 General valves – Steel ball valves connected by flanges or butt welding; GB12238 General valves – Butterfly valves connected by flanges or clamps; GB12239 General valves – Diaphragm valves; GB12244~12246 Pressure reducing valves; GB12247~12251 Steam traps; GB/T13927 General valves – Pressure testing