蝶阀体积小、重置轻、口径越大相对其他阀更经济实惠。蝶阀处于完全开启位置时，蝶板厚 度是介质流经阀体的唯一的阻力，因此通过该阀门所产生的压力降很小，当开启度在大约15度至 7。度之间时，又能进行灵敏的流■控制，因此大口径的流貝调节，蝶阀具有较大的物。 Butterfly valve is small in size, light in weight, and has bigger diameter, and is more economical and practical than other valves. When butterfly valve is in the fully open position, the thickness of butterfly plate is the only resistance of the medium flowing through the body. So the pressure dropped by the valve is small. When It is open in about 15 degrees to 70 degrees, it can perform a sensitive flow control. For the flow control of large caliber, butterfly valve has great advantage.