ball valve and butterfly valve is similar in many ways, in the past 20 years working condition of ball valve was used for throttling. As control min, they had to adapt to the simple open - Close Industrial Valves automation to the special design of accurate control of the process of the process of automatic control valves. Improved seal high precision machined to provide the facilities and the ball tightly closed and characteristic of the control. To a large extent, they are used in condition of high amplitude range. Spherical valve typically deal with amplitude variation range of 300 to 1, Ken to higher than 20 to 1 of butterfly valves. Such a high amplitude range for regulating elements design, it turn into sphere fern logistics and sometimes does not produce spiral fujian dish or cut-off valve core obvious lateral load.

ball valves also can well adapt to the working condition of slurry or contain fiber composition process ( Such as wood pulp) 。 Spherical valve ball spins on the sealing shear action, can make the process of medium in the process of closing cleanly separated. The same process in a butterfly valve or valve ( Use them directly in the process of logistics channel regulating elements or valve core) Will be blocked or glue. Similar to the butterfly valve structure is characterized by linear flow through. Ball yan can be installed in vertical pipeline ( Figure 4. 29) To follow from fibre material or particulate matter such as sedimentation and damage. The other - Aspects, the cut-off valve can process the heavier material deposition in the medium in the bottom of the cut-off valve, Horizontal installation) The workbench (or deposited in the body Vertical pipeline installation) 。

tight closure is a characteristic of the spherical valve, because the sphere maintain frequent contact with the valve seat. For soft seal, spherical valve to obtain grade ANSIM closed ( Bubble tight) 。 But there is a temperature range, the high temperature range, but with metal seat, but industrial valves allow large leakage rate ( ANSIN slow) 。 Ball Kan than by the higher flow capacity, or even higher than that of butterfly valve, because the butterfly valve has a valve plate is placed in the logistics and to limit logistics capacity. Because the flow of the typical ball valve can than comparable size globe valve is about 2 ~ 3 times, then can use smaller size of ball valve. This is a bright economic considerations. Table 4. 2 lists cover the check valve ( T and Y both) And the ball flow capacity comparison between lang.

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