Performance and selection of pneumatic ball valve
The structure of the pneumatic ball valve is that a ball and two sealing seats are enclosed in the middle of the left valve body and the right valve body. When the sphere is in the closed position, the media force at the upstream end acts on the sphere, causing the sphere to tightly press the sealing seat at the downstream end, and an operating specific pressure occurs. When the operating specific pressure is greater than the necessary sealing specific pressure, an effective seal is obtained. .
In order to ensure that a medium force can be generated when the ball is in the closed position, the pneumatic ball valve ball must be close to the sealing seat when the pneumatic valve and pneumatic actuator are installed in advance, and interference is required to generate a pre-tightening pressure. If the pre-tightening pressure is 0.1, the necessary sealing pressure is not less than 2Mpa. The acquisition of this preload ratio depends entirely on the geometric dimensions of the plan.
Pneumatic ball valves are used in the process industry. Pneumatic valves have to suffer from pressure fluctuations and temperature fluctuations. At this time, the shortcomings of plug-type sealed ball valves are highlighted.
The main feature of the pneumatic ball valve is its compact structure, easy to operate and repair, suitable for general operating media such as water, solvents, acids and natural gas, and also suitable for media with harsh operating conditions, such as oxygen, hydrogen peroxide, methane and ethylene, etc. . The valve body of the ball valve can be a whole or a combined type.
Pneumatic ball valves are mainly divided into pneumatic ball valves, pneumatic V-ball valves, pneumatic high-pressure ball valves, pneumatic fluorine-lined ball valves and other products. Pneumatic ball valve switch is light, small in size, can be made into a large diameter, tightly sealed, simple in structure and convenient to repair. Pneumatic ball valve can be widely used in more environments, and can reasonably complete the flow control and adjustment function to prevent Uneven flow may cause risks, or hinder the project.
While feeling the function of the valve, we must also actively understand the related problems of pneumatic valves. Only by selecting a suitable pneumatic valve can the power and value of the operation be improved and the trouble will be reduced. What factors need to be considered when choosing a suitable pneumatic ball valve:
When selecting a pneumatic ball valve, first of all, it is necessary to consider the safety function used. No matter what kind of equipment, it is safe to use and stable operation is often welcomed and sought after by us. The valve is also the same. In the selection process, the use of the valve should not affect the material in circulation, and will not directly contact with water or other liquid objects, so as not to affect the sealing function of the valve, and thus cannot accurately complete the valve function. .
