Introduction of performance and usage of elastic metal hard seal butterfly valve
Elastic metal butterfly valve is an economical and practical choice for most pipelines. It is widely used in oil, chemical, metallurgy, light industry, food, pharmaceutical, water and other industrial sectors, as well as in ventilation, air conditioning and other HVAC systems. It is mainly used as a shutoff, regulating or throttling valve. A variety of materials can be used to meet the requirements of different media.
This valve consists of three parts: a hollow cylindrical body, a circular disc and a rotary stem. The upper and lower ends of the body are installed with flanges and the circular disc is connected with the stem. Its disc has irregular and elliptic types, and the materials used for the disc and stem are the same as that for the valve body. The sealing surface of the circular disc is usually overlayed with elastic material such as rubber. When the valve is opened and closed, the circular disc rotates around the axis of the stem and the disc is opened and closed to regulate or block the flow.
Elastic metal butterfly valves are characterized by compact structure and light weight, easy installation and maintenance. The sealing performance is better than that of traditional butterfly valves. When the valve is completely closed, its open type and size will not be changed. The valve can be opened in both the clockwise and anticlockwise directions. It has a large flow coefficient and is not prone to clogging by medium particles. With its unique loading characteristics, it can be used in medium pressure and low vacuum systems. The sleeve contact with the pipeline and the inner surface of the valve body is difficult to produce corrosion products, and the round grinding process of the valve is to reduce the stress concentration and improve the fatigue life of the welding seam. The connection is reliable, can be used to seal stepless operation, preventing over-ore reaction and affecting the accuracy of the device signal transmission.
Elastic metal hard seal butterfly valve can not be used for the pipelines containing high temperature, high pressure and expansion medium, and its maximum operating temperature must not exceed 195℃, the maximum working pressure should not exceed 3.0Mpa, and its stepless regulating range should not exceed 15%. Both actuators and manual handles can be used for this kind of valve operation. All in all, the elastic metal hard seal butterfly valve has efficient operation, flexible adjustment, long service life and other advantages, which is widely used in various equipment and pipelines.
性能及使用简介弹性金属硬密封蝶阀
弹性金属蝶阀是大多数管道的经济实用的选择，它被广泛用于石油、化工、冶金、轻工、食品、制药、水利等工业领域，以及通风、空调等HVAC系统中。它主要用作截止、调节或者节流阀。可以选择多种材料，满足不同介质的要求。
该阀由三部分组成：空心圆柱体、圆盘和旋转轴。圆柱体上下端安装有法兰，圆盘与轴连接。其圆盘有不规则型和椭圆型，圆盘及轴所 采用的材料与阀体材料相同。圆盘的密封面通常上覆elastic rubber等弹性材料。当阀动作时，圆盘绕轴轴旋转而开启或关闭，以调节或阻断流量。
弹性金属蝶阀的特性是结构紧凑、轻重轻便，安装与维护都是比较简单的。其密封性能优于传统的蝶阀。当关闭时，它的开度和尺寸不变。该阀既可顺时针也可逆时针开启，对应的流量系数也是较大的，不易阻塞介质颗粒物，拥有独特的的负荷特性，可以用于中压及低真空系统中。阀套与管道接触及阀体内部表面不易产生腐蚀产物，阀体进行圆磨加工，以减少应力集中，提高缝缝焊接部位疲劳寿命，连接可靠，可用与无级调节，避免过载反应，影响设备信号传递的准确性。
弹性金属硬密封蝶阀不可用于含有高温、高压及膨胀性介质的管道，最大工作温度不能超过195℃，最大工作压力不能超过3.0Mpa，无级调节范围不能超过15％，它既可通过驱动器操作，也可以人工操作通过手柄操作。总之，弹性金属硬密封蝶阀操作效率高、调节灵活，使用寿命长等优点，在各种设备及管道中应用广泛。
