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[供应] 双偏心硬密封蝶阀
 
 
标题: [供应] 双偏心硬密封蝶阀
类别: » 蝶阀
单位名称:
地区: 江苏省 苏州市 吴中区
发布日期: 2009-10-29
有效期: 30 天
数量:        单价:
型号: D341H

 
  
详细说明
  结构特性
采用双偏心结构。蝶板开启极小角度,金属密封面自动脱离阀座,密封副完全没有外应力,使用寿命长;
蝶阀具有双向密封功能,不分主、次密封方向都能达到零泄漏,特别适合多源循环供水的地下管网。若只有单向介质,应优先采用主密封方向安装。
阀体座圈通过压圈相对蝶板做前后两方向的无级调整;下阀杆底部设计有调节装置,蝶板也能做上下两方向的无级调整。可以在双向密封条件下扭矩最小。
阀体座圈和蝶板密封圈选用优质不锈钢材质,耐腐蚀、耐高温,使用寿命长;采用分体式设计,具有十分可靠的互换性,使用、维护方便;
对于公称通径DN≥1200mm,蝶板采用飞蝶式结构设计,质量轻、刚度高、强度大、流阻系数小,压力损失小。
阀杆与蝶板采用非贯穿偏销定位方式,避免了上阀杆因频繁窜动而造成键的剪切和磨损、从而导致阀门的启闭异常。
阀杆与阀体间采用环保型橡胶”O”型圈,这样既达到免维护又密封可靠,同时彻底克服一般填料密封经常出现的烦人的泄露现象和填料对水质的污染。
工艺特性
自动化流水线涂装设备和先进的工艺流程,保证了防腐性能和完美的外观。
防腐性能
主体(球铁QT500-7)内外表面静电喷涂聚酯改性环氧树脂粉末,涂层均匀牢固,附着力高,耐腐性能好。
食品级卫生要求
无毒环氧树脂粉末,符合GB/T17219-1998要求;
橡胶密封件符合饮用水卫生标准。
适用范围
生活饮用水系统、工业给排水、暖通及燃气系统、化工、发电、冶金等行业的大型装置和管线上。
Double-eccentric metal-to-metal sealed butterfly valve
Summary
Flange double-essentric metal-to-metal sealed butterfly valve is operated by worm gear to decelerate to drive the disc to rotate within 90°.It can be applied to cut off or regulate the flow of media. The valve can be actuated by operating lever, handle wheel, electric actuator or pneumatic actuator. Underground valve can be operated by an extended spindle. No matter operated by electric actuator or pneumatic one, positions where the valve is opened and closed are all equipped with limit switches and indicating devices that synchronically show the opening state of the disc.
Structure:
Being double essentric, when opened, the sealed ring of the disc is automatically off-seated after only a little degree of opening movement. The sealed ring completely bears no external pressure, which helps the valve keep longer life.
Butterfly valve has the capability of bi-directional sealing, which achieves no leakage in both primary and secondary directions, especially applicable to underground wate-supplying network of pipes with circular multi-sources. If only unidirectional media, when installing the valve, the primary direction is of priority.
The position of sealed ring can be adjusted in all directions to modulate the compression of the sealing, which makes the valve able to be operated by minimun torque.
The base ring of the body and the sealed ring of the disc all employ stainless steel of excellent quality, which are competent of high temperature and anti-corrosion and long service life. The sealed structure of the valve uses dividened-body design, dependable interchangeability , easy to apply and maintain.
As to those valves whose DN is equal or larger than 1200mm, the disc applies the flying-disc design with a result of light weight, high rigidity, powerful strength, small flow–resistance and low loss of pressure.
The stem and disc use a positioning pattern of non-penetration and pin–offset to avoid shearing and abrasion of the spline caused by frequent shifting of the upper stem and to prevent abnormal opening and closing of the valve.
Between the stem and the body “o” ring , a kind of environmentally-protecting rubber is applied, which not only achieves no maintenance but also reliable sealing, meanwhile, overcomes potential leakage when stuffing and sealing as well as prevents stuffings’ pollutions of the water.
Technical characteristics:
Automatic assembly and coating product line and developed process-flow ensure the outstanding ability of anti-corrosion and flawless appearances of products.
Anti-corrosion performance:
Indide and outside surfaces of the body are coated with electrostatic epoxy resin powder. The coating is even and firm with good adhesion and excellent anti-corrosion.
Sanitary standard:
Non-toxic epoxy resin powder used comply with sanitary standard GB/T 17219-1998.
The coated resin is in accordance with standards of potable water
Applying area:
The valve can be used in potable water system, water supply and drainage, heat supply, gas, metallurgical industry, energy system and pineline and so on.
 
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