1、直角法兰(PN=20MPa)JB/ZQ4487-97代替JB/ZQ4487一86本标准适用于公称压力PN为20MPa,介质温度为一25十80的直角法兰。型式和尺寸见图1和表1。其45R0.2R0.4图1标记示例：公称通径DN为20mm的直角法兰：直角法兰20JB/ZQ4487一97表1mm公称钢管法兰用O形圈重量通径AADEH11螺钉(GB3452.1)kgDN10182704591218.52830.3113.81.9736M1025.02.65G0.95152237045111622.53230.33.81.9740M1025.02.65G1.1220284557045122028.583
2、5.3113.81.97M1030.02.65G1.08253457592651424642.6135.02.756M1235.52.65G2.353242615921643+0.35.0+0.25+0.10.4M1240.03.55G2.10547.102.7040506100125851838526357.1185.02.7573M1650.0X3.55G6.7550637100125204865.67.1185.02.7573M1660.03.55G6.10657681401701202260789578.15.02.75103M2271.03.55Gh8.0080891014017012025709110892.1245.02.75103M2285.03.55Gt7.00必1法兰配用的螺钉按GB3098.1,强度等级为8.8。2法兰材料为20号钢。技术要求按JB/T74的规定。353
