2. The hardening and surface treatment of the sphere The pneumatic ball valve sphere is generally processed by 2Cr13, and its surface hardness is about HB217, which is easy to be damaged not only in working conditions, but also in the process of assembly and testing. Our company adopts solid chromizing process for test, which has been proved to be very effective after one year's practice. After chromizing, the surface hardness is higher than HV1000 degrees. After the carbon steel ball is infiltrated, the surface chromium content is as high as 60% - 80%. After grinding, the corrosion resistance in seawater, nitric acid, acetic acid and other media exceeds that of the impermeable 2Cr13 3. Modification and modification of sealing seat For general pneumatic ball valves, the sealing seat is generally made of pure PTFE, and its wear resistance is very poor. The company has carried out filling exploration, and finally developed an enhanced PTFE after dozens of formula tests, tests and screening. Its normal temperature compressive strength can reach 289KG/CM2, which promotes the improvement of the quality of our products.

1. For the selection of pneumatic feed water regulating valve, the flow adjustable ratio of feed water valve shall be larger according to the process flow requirements of boiler production system. The pressure difference range of boiler feed water valve is large, which can reach 1-3.82Mpa. When the load is small, the valve opening is small, the pressure difference is large, and the pressure difference is small when the normal operation flow is large. The control valve acts frequently during operation. The frequency conversion pneumatic control valve can be operated twice for a longer time interval between forward and reverse actions, and set a longer soft start time.