Bray's Series 3A/3AH resilient seated butterfly valve is a Double Flanged design which can be used for dead-end service. A major design advantage of Bray valve product lines is international compatibility. The same valve is compatible with most world flange standards – ASME Class 125/150, BS 10 Tables D and E, BS 4504 NP 10/16, DIN ND 10/16, AS 2129 and JIS10. In addition, the valves are designed to comply with ISO 5752-Table 2 (EN558 Table 13) face-to-face and ISO 5211 actuator mounting flanges. Therefore, one valve design can be used in many different world markets.
[A] STEM: Precision double "D" disc to stem connection drives the disc without the need of screws or pins.
[B] SEAT: Bray's bonded seat design lowers torque and provides complete isolation of flowing media from the body. The seat also features a molded O-ring which eliminates the use of flange gaskets.
[C] STEM RETAINING ASSEMBLY: The stem is retained in the body by means of a unique Stainless Steel Spirolox® retaining ring, a thrust washer and two C-rings, manufactured from brass as standard, stainless steel upon request. The retaining ring may be easily removed with a standard hand tool. The stem retaining assembly prevents unintentional removal of the stem during field service.
[D] STEM BUSHING: Non-corrosive, heavy duty acetal bushing absorbs actuator side thrusts.
手动法兰蝶阀广泛适用于各种不同类型工业管道中液体和气体(包括蒸 气)的输送，特别是具有严重腐蚀性介质的使用场合，如：硫酸、氢氟酸、磷酸、氯气、强碱、王水等具有强腐蚀性的介质。
产品特点：
衬氟蝶阀在管路中除了起切断和截流用外,近年来已经把密封性能作为评价的主要指标,受到市场的青睐.另外,蝶阀还有体积小、重量轻、结构简单的优点,与同参数 闸阀比较,平均减轻重量达30-50％,蝶板旋转90°即可实现启、闭过程,又由于转轴两侧蝶板受介质作用力近似相等,转矩相反,因此启闭力矩较小.
产品结构特点：
1.中线蝶阀为整个蝶板与阀座在360°圆周内同心(中线),具有双向密封功能,压力、流量可自由调节;
2.偏心蝶阀为二维方向偏心产生的凸轮效应会使密封副产生足够的密封比压,并且随着工作压力的升高,密封副产生足够的密封比压,并且随着工作压力的升高,密封效果更理想.
3.四级加载弹性密封,绝对保证了阀门内、外的零泄露;
a.轴头、蝶板圆周连接处的特殊过渡曲线与阀座的合理过盈;
b.轴头端面采用弹性O型圈和轴肩处刚性垫圈、弹性橡胶垫组合;
c.轴的径向采用O型圈与金属垫的组合;
d.阀座镶在有弹性条的阀体槽内;
4.采用可调性弹子定位,定位准确,结构简单.
