What are the installation requirements of pneumatic butterfly valve
1. Before installation, check that all parts of the pneumatic butterfly valve are free of missing parts, correct models, sundries in the valve body, and blockage in the solenoid valve and silencer.
2. Place the valve and cylinder in the closed state.
3. Hit the cylinder onto the valve (the installation direction can be parallel or vertical to the valve body), and then check whether the screw hole is aligned without too much deviation. If there is a little deviation, rotate the cylinder body a little, and then tighten the screws.
4. After installation, the pneumatic butterfly valve shall be commissioned (the air supply pressure is 0.4~0.6MPa under normal conditions). During commissioning, the solenoid valve must be opened and closed manually (it can be effective only after the solenoid valve coil is de energized), and the opening and closing of the pneumatic butterfly valve shall be observed. If it is found during commissioning and operation that the valve has some difficulty at the beginning of the opening and closing process, and then it is normal, it is necessary to reduce the stroke of the cylinder (adjust the stroke adjusting screws at both ends of the cylinder a little inward at the same time, and when adjusting, it is necessary to run the valve to the open position, and then turn off and adjust the air source again) until the valve opens and closes smoothly without leakage. It should also be noted that the adjustable silencer can adjust the opening and closing speed of the valve, but it should not be too small, otherwise the valve may not act.
5. The DFA shall be kept dry before installation and shall not be stored in the open air.
6. Before installing the butterfly valve, check the pipeline to ensure that there is no welding slag and other foreign matters in the pipeline.
7. The manual opening and closing resistance of the butterfly valve body is moderate, and the torque of the butterfly valve matches the torque of the selected actuator.
8. The flange specification for butterfly valve connection is correct, and the pipe clamp flange is consistent with the butterfly valve flange standard. It is recommended to use special flange for butterfly valve, and flat welding flange is not allowed.
9. Confirm that the flange welding is correct. Do not weld the flange after the butterfly valve is installed to avoid scalding the rubber parts.
10. The installed pipe flange shall be aligned with the butterfly valve.
11. Install all flange bolts and tighten them by hand to confirm that the butterfly valve is aligned with the flange, and then carefully open and close the butterfly valve to ensure flexible opening and closing.
12. Fully open the valve, use a wrench to tighten the bolts in a diagonal sequence, without washers. Do not tighten the bolts too tightly to prevent serious deformation of the valve ring and excessive opening and closing torque.

Comprehensive performance of non-metallic compensator
Its good comprehensive performance makes it widely used in many engineering fields. The ventilation, dust removal, smoke exhaust and air conditioning insulation pipes and equipment with low working pressure usually use the Pingcheng compensator.
In the pipeline system, if the thermal stress caused by temperature change, the partial stress caused by equipment vibration and fixed support, and the stress caused by system device deflection exist at the same time, the rigid connection mode will inevitably lead to deformation or destruction of the pipeline system at the thinnest place. If flexible non-metallic compensators are used, this kind of destruction can be prevented. This is related to the unique motion mode of non-metallic compensator. These motion modes determine the multi-dimensional displacement performance of non-metallic compensators.
Pressure bearing single wave body and multi wave body compensators play an irreplaceable role in some special working conditions. The electronic weighing scale used in the desulfurization and powder injection system of a steel plant was originally used to compensate equipment and pipelines with metal compensators. Due to the large reverse thrust, the electronic weighing scale was not accurately debugged and could not return to zero and weigh correctly. This kind of compensator with rectangular diameter and large displacement can only reach the application request by using non-metallic data. Through special structural design and data design, the characteristics of non-metallic flexible compensator required by working conditions are met