1、 Overview of pneumatic ball valve: pneumatic ball valve is a ball valve equipped with a pneumatic actuator. The pneumatic actuator has a relatively fast execution speed, with the fastest switching speed of 0.05 seconds per time, so it is usually called pneumatic quick cut-off ball valve. Pneumatic ball valves are usually equipped with various accessories, such as solenoid valves, air source processing triplets, limit switches, positioners, control boxes, etc., to achieve local control and remote centralized control. The valve can be opened and closed in the control room without the need to run to the site or high altitude and dangerous areas for manual control, which greatly saves human resources, time and safety

Check all the pipes and valves of the heat carrier circulation system, all the pipes and valves of the sewage system, all the pipes, valves and insulation layers of the gas supply system, check the blocking condition of the ash outlet of the dust remover, check the electric control instruments and maintenance installation in the operation room, and stop the commissioning after inspection. The commissioning is to further verify the quality of the device, The important work of system performance and familiarization with operation essentials to ensure normal operation should be jointly participated by management personnel, technicians and operators. During the operation after the initial startup of the equipment, the measurement and recording of equipment working conditions should be stopped to ensure the normal operation of the system in the future. Post welding heat treatment of bellows compensator
After titanium welding, the welded joints will produce internal stress. In order to avoid cold cracks and cracking of welded joints during pressing, the welded cylinder sections will be stopped annealing before pressing. This annealing will also be used in the subsequent pressing process when titanium is annealed, which can reduce strength, improve plasticity and obtain better comprehensive performance, In order to reduce the influence of gas on the appearance of titanium materials during heat treatment, the heat treatment temperature should be as low as possible. The ordinary annealing temperature should be higher than the recrystallization temperature, but lower than the gamma and beta phase transformation temperature of 100-120 ℃. At this time, the fine grain structure is obtained. Therefore, the annealing temperature should be 680 ℃ during the trial production process, The holding time should be as short as possible. The holding time should be 30 minutes. Under high temperature, titanium has high chemical activity, which is easy to react with elements such as hydrogen, oxygen and nitrogen in the furnace gas, and has adverse effects on the processing performance and application performance. It must be controlled. Titanium can form a dense oxide and nitride maintenance film with high chemical stability with oxygen and nitrogen. With the increase of temperature, The oxide layer gradually thickens. During heat treatment, coating maintenance must be stopped on the surface inside the cylinder. In order to eliminate the stress corrosion caused by chlorides on titanium, special attention should be paid to the maintenance work when handling and cleaning the bellows compensator before and after heat treatment
The splicing weld of data shall be welded by argon tungsten arc welding and maintained by argon with purity of 99.9999% to ensure that the weld and heat affected zone are not oxidized. Before welding the contraction joint compensator, the attachment and oxide layer on the groove and the base metal surface must be removed by scraper. The presence of oxide film and impurities will affect the performance of the weld and heat affected zone, Low current shall be used for welding to prevent excessive speed, no swing, and the interlayer temperature shall be controlled below 100 ℃. Argon gas shall be used for the maintenance of front and back surfaces to prevent the alloy elements from burning at high temperature. Before pressing, the weld surface shall be polished and lubricated to remove the thicker oxide layer on the weld surface and assisted by acid pickling. The oxide layer of B3 data weld is very hard, and it is difficult to remove it by direct acid pickling, It is easy to produce slight cracks in the process of pressing and forming, and the impact on the weld performance is proved by examples