JIS B 2051-2020 pdf download.Malleable iron and ductile iron valves.
This Standard specifies requirements for screwed end valves and flanged end valves made of malleable cast iron and ductile cast iron used for general machinery (hereafter referred to as valves).
Annex C shows for reference the operation restriction torque for operating the valveby handwheel.
NOTE 1 The malleable cast iron in the title of this Standard is the generic term for blackheart malleable cast iron, and the ductile cast iron is the generic term for the spherical graphite cast iron and the ductile cast iron prod-ucts specified in Annex A of this Standard.
NOTE 2 All the pressure values shown in this Standard are gauge pressurevalues.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. The most recent editions of the standards (includingamendments) indicated below shall be applied.
JIS B 0100 Glossary of terms for valves
JIS B 0203 Taper pipe threads
JIS B 0253 Gauges for taper pipe threads
JIS B 1054-1 Mechanical properties of corrosion-resistant stainless steel fasteners—Part 1: Bolts, screws and studs
JIS B 1054-2 Mechanical properties of corrosion-resistant stainless steel fasteners—Part 2: Nuts
JIS B 1180 Hexagon head bolts and hexagon head screws
JIS B 1181 Hexagon nuts and hexagon thin nuts
JIS B 2001 Nominal size and bore of valves
JIS B 2002 Face-to-face and end-to-end dimensions of valves
JIS B 2003 General rules for inspection of valves
JIS B 2004 General rules for marking on valves
JIS B 2239 Cast iron pipe flanges
JIS G 0320 Standard test method for heat analysis of steel products
JIS G 3101 Rolled steels for general structure
JIS G 3202 Carbon steel forgings for pressure vessels
JIS G 3214 Stainless steel forgings for pressure vessels
JIS G 4051 Carbon steels for machine structural use.
JIS G 4303 Stainless steel bars
JIS G 5121 Corrosion-resistant cast steels for general applications
JIS G 5501 Grey iron castings
JIS G 5502 Spheroidal graphite iron castings
JIS G 5705 Malleable iron castings
JIS H 3100 Copper and copper alloy sheets, plates and strips
JIS H 3250 Copper and copper alloy rods and bars
JIS H 5120 Copper and copper alloy castings
JIS K 0116 General rules for atomic emission spectrometry
JIS K 6896 Polytetrafluoroethylene powder for molding and extrusion materials
JIS K 7137-1 Plastics—Polytetrafluoroethylene (PTFE) semi-finished products— Part 1: Requirements and designation
JIS Z 2241 Metallic materials—Tensile testing—Method of test at room temperature
JIS Z 2242 Method for Charpy pendulum impact test of metallic materials
JIS Z 2243-1 Brinell hardness test—Part 1: Test method
JIS Z 2243-2 Brinell hardness test—Part 2: Table of hardness values
3 Terms and definitions
For the purpose of this Standard, the terms and definitions given in JIS B 0100 apply.
4 Classification
Valves shall be classified according to the combination of nominal pressure, type of valve and nominal size, as given in Table 1.JIS B 2051 pdf download.