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  中压(15-125 psi)蒸汽系统阀门选型
MEDIUM-PRESSURE STEAM SERVICE (15-125 psi) SPECIFICATIONS

美国尼伯科有限公司

通径DN65以下管线控制阀
LINE CONTROL VALVES 2 1/2" AND SMALLER

  球阀:
  BALL VALVES:

  这类阀门的额定安全工作压力为150 psi,非冲击冷水工作压力为600 psi,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,防吹出不锈钢阀杆和不锈钢球体。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。
  Valves shall be rated 150 psi SWP and 600 psi non-shock CWP and will have 2-pc. cast bronze bodies, TFE seats, standard port, separate packnut with adjustable stem packing, anti-blowout stainless steel stems and stainless steel vented ball. Where pressure drop is a concern, full-port ball valves of like construction are to be used. Valve ends shall have full depth ANSI threads and be manufactured to comply with MSS-SP110
  可采用的标准流道阀门:
  美国尼伯科T-580-70-66球阀(螺纹)
  ACCEPTABLE VALVES STANDARD PORT:
  NIBCO T580-70-66

  可采用的不缩径全流道阀门:
  美国尼伯科T-585-70-66(螺纹)
  ACCEPTABLE VALVES FULL PORT:
  NIBCO T585-70-66

  闸阀:
  GATE VALVES:

  这种阀门应该是螺纹连接,工作压力是125磅级,明杆,管接头式阀盖,实心楔板,并按照美国阀门和管件制造商标准化协会MSS-SP 80标准制造。阀体,阀盖和楔板材质符合美国材料试验协会ASTM B 62标准青铜。阀杆材质是符合美国材料试验协会ASTM B 371标准抗失锌现象的硅青铜,或B 99低锌合金,不含石棉的填料,可锻或球墨铸铁手轮。如果工作压力比较高,接近100 psi,则应该采用150磅级管接头阀盖或类似结构的阀门。
  Valves shall be threaded Class 125 rising stem, union bonnet, solid wedge and manufactured in accordance with MSS-SP80. Body, bonnet and wedge are to be of bronze ASTM B 62. Stems shall be of dezincification-resistant silicon bronze ASTM B 371 or low-zinc alloy B 99, non-asbestos packing and malleable or ductile iron handwheel. Where steam working pressures approach 100 psi, Class 150 union bonnet valves of like construction will be used.
  可采用的阀门:
  125磅级美国尼伯科T-124闸阀
  150磅级美国尼伯科T-134闸阀
  ACCEPTABLE VALVES:
  Class 125 NIBCO T124
  Class 150 NIBCO T134

  截止阀/角阀:
  GLOBE/ANGLE VALVES:

  这种阀门工作压力是125磅级,并按照美国阀门和管件制造标准化协会MSS-SP 80标准制造;阀体和阀盖材质是符合美国材料试验协会ASTM B 62标准的青铜。阀杆材质是符合美国材料试验协会ASTM B371标准的抗失锌现象的硅青铜或B 99标准的低锌合金,不含石棉的填料,聚四氟乙烯阀座阀瓣,可锻或球墨铸铁手轮。如果工作压力比较高,接近100 psi,则应该采用150磅级管接头阀盖或类似结构的阀门。如果用于关闭节流或锅炉排水,则阀门应该采用全塞不锈钢阀座/阀瓣。
  Valves shall be threaded Class 125 and manufactured in accordance with MSS-SP80; body and bonnet are to be of bronze ASTM B 62. Stems shall be of dezincification-resistant silicon bronze ASTM B 371 or low-zinc alloy B 99, non-asbestos packing, TFE seat disc and malleable or ductile iron handwheel. Where steam working pressures approach 100 psi, Class 150 union bonnet valves of like construction will be used. For close throttling or boiler blow-down use, valves shall have full plug stainless steel seat/disc.
  可采用的阀门:
  125磅级美国尼伯科T-211-Y截止阀/T-311-Y角阀
  150磅级美国尼伯科T-235-Y截止阀/T-335-Y角阀
  200磅级美国尼伯科T-256-AP截止阀(全塞不锈钢阀座/阀瓣)
  300磅级美国尼伯科T-376-AP截止阀(全塞不锈钢阀座/阀瓣)
  ACCEPTABLE VALVES:
  Class 125 NIBCO globe/angle T211-Y/T311-Y
  Class 150 NIBCO globe/angle T235-Y/T335-Y
  Class 200 NIBCO globe T-256-AP (full plug   stainless steel seat/disc)
  Class 300 NIBCO angle T-376-AP (full plug stainless steel seat/disc)

 

通径DN65以上的管线控制阀
LINE CONTROL VALVES 2 1/2” AND LARGER

  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铸铁标准,填料和衬垫不含石棉。如果蒸汽工作压力超过100 psi,需要采用250磅级或类似结构的阀门。
  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 bonnet conforming to ASTM A 126 Class B cast iron. Packing and gaskets to be nonasbestos. Where steam working pressures exceed 100 psi, Class 250 valves of like construction shall be used.
  可采用的阀门:
  美国尼伯科125磅级F-617-O闸阀
  美国尼伯科125磅级F-718-B截止阀
  美国尼伯科125磅级F-818-B角阀
  美国尼伯科250磅级F-667-O闸阀
  美国尼伯科250磅级F-768-B截止阀
  ACCEPTABLE VALVES:
  Class 125 Gate NIBCO F617-0;
  Class 125 Globe NIBCO F718-B;
  Class 125 Angle NIBCO F818-B;
  Class 250 Gate NIBCO F667-0;
  Class 250 Globe NIBCO F768-B

  止回阀:
  CHECK VALVES:

  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ASTM B 62标准的青铜阀体,配置聚四氟乙烯阀座阀座阀瓣。如果蒸汽工作压力超过100 psi,需要采用250磅级或类似结构的阀门。
  2 1/2" and smaller shall be threaded Y-pattern swing-type manufactured in accordance with MSS-SP80, Class 125, bronze ASTM B 62 body with TFE seat disc. Where steam working pressures approach 100 psi, Class 150 valves of like construction shall be used.
  可采用的阀门:
  125磅级美国尼伯科T-413-Y止回阀
  150磅级美国尼伯科T-433-Y止回阀
  ACCEPTABLE VALVES:
  Class 125 NIBCO T413-Y;
  Class 150 NIBCO T433-Y

  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。如果蒸汽工作压力超过100 psi,需要采用250磅级或类似结构的阀门。
  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. Where steam working pressures approach 100 psi, Class 250 valves of like construction shall be used.
  可采用的阀门:
  美国尼伯科125磅级F-918-B止回阀
  美国尼伯科250磅级F-968-B止回阀
  ACCEPTABLE VALVES:
  Class 125 NIBCO F918-B
  Class 250 NIBCO F968-B

  截止止回阀:
  STOP CHECK VALVES:

  通径DN65以上250磅级角式截止阀类型的截止止回阀可以用在锅炉上,代替截止阀、角阀类型的控制阀和旋启式止回阀。法兰阀体和阀盖采用符合美国材料试验协会ASTM A 126级别B标准的铸铁制造,配置青铜阀内件和不含石墨的衬垫。截止止回阀得通径请参考制造商的推荐。
  2 1/2" and larger Class 250 angle-globe style stop check valves may be used on boilers in lieu of globe or angle style control valves and swing check valves. Flanged body and bonnet are to be manufactured from ASTM A 126 Class B cast iron with bronze trim and non-asbestos gaskets. Sizing of stop check is to be in accordance with manufacturer's recommendations.
  可采用的阀门:
  美国尼伯科F-869-B截止止回阀
  ACCEPTABLE VALVES:
  NIBCO F869-B

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