For this pneumatic on-off butterfly valve equipment, the whole product has the characteristics of small size, easy installation and maintenance, which can ensure that people can get more help in the use and installation process, making the installation and use of the whole product easier, without causing many inconvenience problems in installation and construction, In addition, the use of this product should pay special attention to the actual use characteristics and key parts of the product, so as to ensure the use effect of the whole product. In addition, this equipment also has many good quality designs, such as the whole butterfly valve equipment is a good design, The whole equipment has a lot of good compactness in use, which can better ensure that the whole equipment has a longer service life in use, and if there are some problems in the use process, it can better carry out maintenance and change parts, and this pneumatic design can complete the opening and closing of the whole valve at a higher speed, Therefore, people who use this product should have a detailed understanding of the characteristics of these aspects to ensure that people can get more practical help from it.

2、 Operating principle of hard seal ball valve: the sealing surface of the valve seat is biased b When the valve stem rotates 90 ° clockwise around the O point, the center line of the ball of the cam biased single valve seat is offset ab from the center line of the valve body. Then the ball also rotates 90 ° and closely matches the sealing surface of the valve seat. When the conflict torque between the sealing pairs and between the packing and the valve stem is greater than the torque formed by the medium pressure, The valve will reach a secure seal.