How to deal with the loose opening and closing of 2-wire pneumatic diaphragm regulating butterfly valve? ⑤ Pneumatic electric positioner: adjust and control the medium flow of the valve according to the size of the current signal (standard 4-20mA).
The non-metallic expansion joint has some incomparable characteristics of the metal contraction joint. Its main characteristics are as follows:
(1) Good flexibility, no reverse thrust effect on equipment and system, great convenience for pipeline design, and improved safety of equipment and system
(The displacement absorbed per unit length of 2 J is large, and the displacement in three-dimensional direction can be absorbed.
(3) The device is simple and easy to change. There is no need for high request alignment, no need for lifting equipment, and the time required for change is short. At the same time, it can comply with the permanent misalignment of the pipeline caused by the settlement of the foundation after the medium or long-term work of the pipeline transformation:
(4) With strong adaptability, it can be shaped into arbitrary shape and arbitrary perimeter, such as rectangle, cone and plane.
(5) Good vibration isolation effect, close to zero vibration transmission.
(6) High temperature resistance can reach more than 1000 ℃.
(7) Corrosion resistance, the corrosion resistance of the data itself and the prevention of condensation and corrosion on the inside and outside
(8) Sound insulation, low noise and energy saving.
