产品结构特点 Construction features 内螺纹与承插焊截止阀的闭合原理是，依靠阀杠压力，使阀瓣密封面与阀座密封面紧密贴合，阻止介质流通。截止阀只许介质单向流动，安装时有方向性。截止阀的结构 长度大于闸阀，同时流体阻力大，长期运行时，密封可靠性不强。 The closed principle of the internal screw and socket welding stop valve is to rely on the stem pressure to close the sealing cover of the disc and the sealing cover of the seat to prevent the circulation of the medium. The globe valve only allows the medium to flow in one direction, and the installation has directivity. The globe valve has a structure length greater than gate valve, while fluid resistance is large, and the sealing reliability is not strong in the long run. 技术规范 Technical specification 截止阀结构长度和外接尺寸 Main connection dimensions
设计依据 Design reference GB系列 GB series 设计标准 Design standard GB/T12235 结构长度 Face to face GB/T12221 连接法兰 End flange GB/T9113 HG20592 试验和检验 Test & inspection GB/T 26480
试验压力 Test prssure压力等级
Pressure grade试验压力 Test pressure 公称压力 PN
Nominal pressure壳体试验
Sheil test正密封试验
Sealing test反密封试验
Sealing test气密封试验
Air seal test1.6 2.4 1.76 1.76 0.6 2.5 3.75 2.75 2.75 0.6 4.0 6.0 4.4 4.4 0.6 6.3 9.45 6.93 6.93 0.6 10.0 15.0 11.0 11.0 0.6 16.0 24.0 17.6 17.6 0.6 26.0 39.0 28.5 28.5 0.6 PN:1.6~4.0 PN:6.4~10.0 公称通径
DNL
(mm)H
(mm)D0
(mm)L
(mm)H
(mm)D0
(mm)15 130 180 100 170 180 100 20 150 175 100 190 190 100 25 160 210 125 210 230 125 32 180 240 160 230 240 160 40 200 270 160 260 270 160 50 230 300 180 300 285 180 PN:26.0 公称通径
DNL
(mm)H
(mm)D0
(mm)15 216 195 125 20 229 200 125 25 254 230 160 32 279 235 160 40 305 260 180 50 371 340 200
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