真空系统阀门如何选型

译文：
通径DN65以下管线控制阀的选型： 1、球阀： 这类阀门的冷工作压力应该为600psi，两件式铸青铜阀体，聚四氟乙烯阀座，标准流道，分离式包装螺母，配置可调节阀杆填料，防吹出阀杆和镀铬黄铜/青铜球体。在需要关注压降的地方，需要采用不缩径全流道球阀或类似结构的阀门。阀门连接端口应该具有足够深度的美国国家标准协会ANSI螺纹，或加长焊接端口，并按照美国阀门和管件制造商标准化协会MSS-SP110标准制造。 （1）、可采用的标准流道阀门：美国尼伯科T-580-70球阀（螺纹）；S-580-70球阀（焊接） （2）、可采用的不缩径全流道阀门：美国尼伯科T-585-70球阀（螺纹）；S-585-70球阀（焊接） 2、止回阀： 通径DN65以下的止回阀应该采用Y形旋启式结构，并按照美国阀门和管件制造商标准化协会MSS-SP80标准制造，工作压力125磅级，符合美国材料试验协会ASTMB62标准的青铜阀体，配置聚四氟乙烯阀座阀瓣，或配置弹性阀座的弹簧驱动升降式止回阀。阀门连接方式应该是螺纹或焊接。 可采用的阀门： （1）、125磅级美国尼伯科T-413-Y止回阀（螺纹）；S-413-Y（焊接） （2）、美国尼伯科T-480-Y弹簧驱动升降式止回阀（螺纹）；S-480-Y（焊接） （3）、通径DN65以上的管线控制阀 3、蝶阀： 这类阀门应该是凸耳或国际管道标准I.P.S.管状连接端口阀体，并按照美国阀门和管件制造商标准化协会MSS-SP67标准制造；通径DN50～DN300额定工作压力是200psi非冲击冷水，DN350以上是150psi。用于保温隔热绝缘的阀体具有2英寸的加长管径，材质是铸铁或球墨铸铁。蝶板材质是电镀球墨铸铁或铝青铜合金，配置丁纳橡胶-N阀座和密封；或丁纳橡胶-N涂层蝶板，配置聚合物涂层阀体。阀杆应该是400系列不锈钢，不能将阀杆暴露在蝶板紧固件上。通径DN65至DN150应该配置具有10个位置节流板的操作手柄；通径DN200以上的蝶阀应该配置齿轮操作机构。凸耳结构和管状结构蝶阀应该能够用作隔断阀，而且不需要下游法兰也可以在全压力下用在管道终端。手柄操作阀门应该适用于锁定在开启或关闭位置。 可采用的阀门： （1）、凸耳阀体，电镀球墨铸铁蝶板的美国尼伯科LD3110-3蝶阀（手柄操作机构）；LD3110-5蝶阀（齿轮操作机构） （2）、凸耳阀体，铝青铜蝶板的美国尼伯科LD2100-3蝶阀（手柄操作机构）；LD2100-5蝶阀（齿轮操作机构） （3）、管状阀体，橡胶涂层蝶板的美国尼伯科GD4775-3蝶阀（手柄操作机构）；GD4775-5蝶阀（齿轮操作机构） 4、止回阀： 通径DN65以上的止回阀应该采用平板式（对夹式）结构，并配置不锈钢弹簧，青铜阀瓣板，橡胶阀座，符合美国材料试验协会ASTMA126级别B标准或A48标准的铸铁阀体，配置125磅级或150磅级法兰。

“ How the selection of the vacuum system valve ”是由中国蝶阀网提供的国际阀门新闻，译文仅供参考。另外，中国蝶阀网还提供相关产品搜索：蝶阀型号、蝶阀价格、 蝶阀技术、蝶阀新闻、蝶阀生产商等。

原文：
DN65 diameter pipeline control valve selection below: 1, ball valve: Cold working pressure of these valves should be 600psi, two-piece cast bronze body, Teflon seat, standard flow channel, separate packing nut, configuration, adjustable stem packing, anti-blow out stem and chrome yellow copper / bronze ball. Pressure drop in the need to focus on areas need to adopt the whole flow channel diameter indented ball valve or similar structure. Valve ports should have sufficient Butt-clamped turbine-driven three-butterfly valvedepth of the American National Standards Institute ANSI thread, or longer weld ports, and valves and pipe fittings in accordance with the United States Manufacturers Standardization Society MSS-SP110 standards for manufacturing. (1), the standard flow channel valve can be used: the United States NIBCO T-580-70 Valve (thread); S-580-70 Valve (welding) (2), available to full-flow channel valve indented Path: The United States NIBCO T-585-70 Valve (thread); S-585-70 Valve (welding) 2, check valve: Path DN65 valve should be used the following Swing Y-shaped structure, and in accordance with the United States valves and pipe fittings Manufacturers Standardization Society MSS-SP80 standards of manufacture, working pressure 125 lbs class, in line with the United States Society for Testing and Materials Standard Bronze ASTMB62 valve, configuration, Teflon flap valve seat, or seat configuration flexibility of the spring-driven lift-type check valve. Valve connection should be threaded or welded. The valve can be used: (1), 125-pound U.S. NIBCO T-413-Y valve (thread); S-413-Y (welding) (2), United States NIBCO T-480-Y Spring-driven lift valve (thread); S-480-Y (welding) (3), diameter of the Stretch type turbine driven flange butterfly valvepipeline control valves for more than DN65 3, Butterfly: Such valves should be a convex ear or international standards for IPS pipe tubular port valve, and valves and pipe fittings in accordance with the United States Manufacturers Standardization Society MSS-SP67 standards of manufacture; diameter DN50 ~ DN300 rated working pressure is 200psi non-shock cold water , DN350 above 150psi. Insulation for thermal insulation with 2-inch longer body diameter, material is cast iron or ductile iron. Butterfly plate material is ductile iron or aluminum bronze alloy plating, configure Duenner-N rubber seat and seals; or Duenner butterfly rubber-N-coated plates, polymer-coated valve configuration. Stem should be 400 series stainless steel, can not stem exposed to the butterfly plate fasteners. DN65 to DN150 diameter should be configured with 10 locations operating handle cutting board; over Butterfly Valve DN200 diameter gear operating mechanism should be configured. Ear structure and the tubular structure of butterfly valves should be able to be used as cut off valve, and does not require the downstream flange can also be used in the pipe under pressure the whole terminal. Operation of the valve handle should be applied to lock in the open or closed position. The valve can be used: (1), protruding ears valve, electroplating ductile iron butterfly board the U.S. NIBCO LD3110-3 valve Butt-clamped electric three-cam butterfly valve (handle operating mechanism); LD3110-5 Butterfly (gear operating mechanism) (2), convex ear valve, aluminum bronze butterfly board the U.S. NIBCO LD2100-3 valve (handle operating mechanism); LD2100-5 Butterfly (gear operating mechanism) (3), tubular valve body, rubber-coated butterfly board the U.S. NIBCO GD4775-3 valve (handle operating mechanism); GD4775-5 Butterfly (gear operating mechanism) 4, check valve: Path DN65 valve should be used more than flat-plate (for clip-on) structure, and configure the stainless steel spring, bronze valve flap plates, rubber valve seat, in line with the U.S. Society for Testing and Materials ASTMA126 Level B standard or A48 standard cast iron valve body, Configuration 125 lbs class or 150-pound flange.