If there is no oil leakage in the hook and ring type ball valve pneumatic butterfly valve, check whether the hook and ring type ball valve pneumatic butterfly valve connecting pin, connecting rod, connecting hole, bushing, etc. are damaged, desoldered, cracked or fallen off
If the above inspection is normal, the pneumatic butterfly valve of the hook and ring ball valve shall be further disassembled to check whether the fit clearance between the piston and the cylinder barrel is too large, whether the cylinder barrel is strained, whether the valve seal is good, whether the valve clack and the valve seat fit tightly, and whether the extension ball valve of the pneumatic butterfly valve of the hook and ring ball valve is too soft or broken. The method of grinding or replacing parts shall be adopted according to the situation
In addition, the hook and ring ball valve pneumatic butterfly valve will make a noise in actual use, which is mainly caused by the collision between the hook and ring ball valve pneumatic butterfly valve and the steel plate ball valve, frame or shaft, damage or falling of the rubber pad, deformation of the dust cylinder of the hook and ring ball valve pneumatic butterfly valve, insufficient oil and other reasons. The causes should be found out, After inspection and repair, the hook ring type ball valve pneumatic butterfly valve shall be tested for working performance on a special test bench. When the resistance frequency is 100 ± 1mm, the resistance of its stretching stroke and compression stroke shall meet the requirements
If there is no test condition, we can also adopt an empirical method, that is, use an iron bar to penetrate into the lower ring of the hook and ring type ball valve pneumatic butterfly valve, which indicates that the hook and ring type ball valve pneumatic butterfly valve is basically normal