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冷凝器与管线控制阀冷却水阀门选型

时间:2011-03-14 17:26:50 来源:未知

  通径DN65以上的管线控制阀



  LINE CONTROL VALVES 2 1/2”AND LARGER



  蝶阀:



  BUTTERFLY VALVES:



  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200 psi非冲击冷水,DN350以上是150 psi。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。蝶板材质是铝青铜合金,配置三元乙丙橡胶阀座和密封;或三元乙丙橡胶涂层蝶板,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。



  Valves shall be lug or I.P.S. grooved body style manufactured in accordance with MSS-SP67; 2"-12" rated at least 200 psi non-shock cold water working pressure, 14" and larger rated at 150 psi.Body to have 2" extended neck for insulating and to be cast iron or ductile iron. Valve to havealuminum bronze alloy disc with EPDM rubber seat and seals; or EPDM rubber encapsulated disc withpolymer-coated body. Stem shall be 400 series stainless steel and shall not have exposed stem todisc fasteners. sizes 2 1/2"-6" shall be lever operated with 10-position throttling plate; sizes8" and larger shall have gear operators. Lug-style and grooved style shall be capable for use asisolation valves and recommended by manufacturer for dead-end service at full pressure withoutthe need for downstream flanges.



  可采用的阀门:



  凸耳阀体,铝青铜蝶板的美国尼伯科LD2000-3蝶阀(手柄操作机构);LD2000-5蝶阀(齿轮操作机构);LD1000-5蝶阀(齿轮操作机构),通径DN350以上。



  管状阀体,橡胶涂层蝶板的美国尼伯科GD4765-3蝶阀(手柄操作机构);GD4765-5蝶阀(齿轮操作机构)



  ACCEPTABLE VALVES:



  Lug body, aluminum bronze disc NIBCO LD2000-3 (lever operator); LD2000-5 (gear operator);LD1000-5 (gear operator) 14" and larger



  Grooved body, rubber-coated disc NIBCO GD4765-3 (lever operator); GD4765-5 (gear operator)



  闸阀,截止阀/角阀:



  GATE, GLOBE/ANGLE VALVES:



  这些阀门工作压力为125磅级,并按照美国阀门与管件制造商标准化协会MSS-SP70(闸阀)标准或MSS-SP85(截止阀/角阀)标准制造,法兰连接,螺栓阀盖,OS&Y,铸铁阀体,青铜阀内件,阀体和阀盖材质符合美国材料试验协会ASTM A 126级别B标准铸铁,填料和衬垫不含石棉。



  Valves to be Class 125 manufactured in accordance with MSS-SP70 (gate) or MSS-SP85 (globe/angle), flanged, bolted bonnet, OS&Y, iron body, bronze trimmed, with body and bonnetconforming to ASTM A 126 Class B cast iron. Packing and gaskets to be non-asbestos.



  可采用的阀门:



  美国尼伯科F-617-O闸阀



  美国尼伯科F-718-B截止阀



  美国尼伯科F-818-B角阀



  ACCEPTABLE VALVES:



  Gate NIBCO F617-0;



  Globe NIBCO F718-B;



  Angle NIBCO F818-B#p#分页标题#e#



  止回阀:



  CHECK VALVES:



  通径DN65以上的止回阀应该采用旋启式结构,并按照美国阀门和管件制造商标准协会MSS-SP71标准制造,125磅级,法兰连接,符合美国材料试验协会ASTM A 126级别B标准的铸铁阀体和青铜阀内件,不含石棉的衬垫。也可以采用平板式结构,配置不锈钢弹簧,青铜阀瓣,橡胶阀座,符合美国材料试验协会ASTM A 126级别B标准的或A 48标准的铸铁阀体,配置125磅级或150磅级法兰。弹簧执行机构止回阀用于管道排放。外置操作手柄和弹簧执行机构的旋启式止回阀用于污水坑、排污和雨水排泄管道。



  2 1/2" and larger shall be swing-type manufactured in accordance with MSS-SP71, Class 125,flanged ASTM A 126 Class B cast iron body with bronze trim, non-asbestos gasket. Or wafer-stylewith stainless steel spring, bronze disc plates, rubber seat, body of cast iron ASTM A 126 ClassB or A 48 for use with Class 125/150 flanges. Spring-actuated valve to be used on pump discharge.Swing check with outside lever and spring to be used on sump, sewage and storm drain lines.



  可采用的阀门:



  旋启式美国尼伯科F-918-B止回阀



  弹簧执行机构平板式美国尼伯科W-920-W或KW-900-W止回阀,或外置手柄和弹簧的W-910-W旋启式止回阀,或配置重力拉杆的美国尼伯科F-918-BL&S或F-918-BLW止回阀



  ACCEPTABLE VALVES:



  Swing-type NIBCO F918-B



  Spring-actuated wafer-type NIBCO W920-W or KW900-W or W910-W Swing-type with outside lever andspring or weight, NIBCO F918-BL&S or F918-BLW



  流量平衡阀门:



  CIRCUIT BALANCING VALVES:



  用于热水和冷水管道系统的通径DN15至DN50流量平衡阀应该以美国尼伯科型号1710为基础,而通径DN50至DN300应该以美国尼伯科型号737为基础。通径DN15至DN50阀门的材质应该是抗失锌现象的黄铜或青铜。通径DN50至DN300阀门的材质是铸铁,配置美国国家标准化组织(ANSI)125磅级/150磅级法兰或管状连接端口。对于需要精确调节和控制流量的场合,所采用的阀门应该是截止阀结构,压力-温度等级为121oC,175 psi时采用铸铁材质,压力-温度等级为121oC,240 psi时采用青铜材质。每个阀门应该配置两个测试端口,内置止回阀和保护阀盖。所有流量平衡阀均配置可视位置读数指示器,并内置操作位置记忆装置,用于重复调节和控制。



  Valves for heating and chilled water service shall be based on NIBCO Figure 1710, 1/2" to 2"and NIBCO Figure 737 2" to 12". 1/2" to 2" valves shall be constructed of dezincification resistant brass or bronze alloy. 2" to 12" valves will be constructed of iron with ANSI Class125/150 flanged or grooved ends. All valves shall be globe style for precise regulation andcontrol and rated 175 psi for Iron and 240psi for Bronze at 250°F. Each valve shall have twometering/test ports with internal check valve and protective caps. All valves must be equippedwith visual position readout and memory stop for repeatable regulation and control.



  可采用的阀门



  美国尼伯科T-1710流量平衡阀(螺纹);S-1710流量平衡阀(焊接)



  美国尼伯科F-737流量平衡阀(法兰);G-737(管状)



  ACCEPTABLE VALVES:



  NIBCO T1710 (threaded); S1710 (solder)#p#分页标题#e#



  NIBCO F737 (flanged); G737 (grooved)