How to check the pneumatic butterfly valve of motorcycle??
How to check and repair the pneumatic butterfly valve on the motorcycle? Today, let's simply introduce some knowledge in this field to us! Xizhen has many years of experience in rubber pneumatic butterfly valve consumption.
Clamp the lower connecting ring on the bench clamp, remove the pneumatic butterfly valve of the motorcycle and erect it. Pull and press the shock absorber rod several times with force. At this time, there should be stable resistance. The upward pull (recovery) resistance should be greater than the downward pressure resistance. If the resistance is unstable or there is no resistance, it may be the lack of oil inside the motorcycle pneumatic butterfly valve or the valve parts are damaged. Repair or replacement of parts should be stopped.
Then check whether there is any damage, desoldering, splitting or scattering in the connecting pin, connecting rod, connecting hole, rubber bushing, etc. of the motorcycle pneumatic butterfly valve. If the above inspection is normal, it is assumed that the motorcycle pneumatic butterfly valve has no oil leakage. Then the motorcycle pneumatic butterfly valve shall be further synthesized 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 spring of the motorcycle pneumatic butterfly valve is too soft or broken. According to the situation, the method of grinding or replacing parts shall be adopted for repair.
The cylinder head contains the valve mechanism. When the spark ignites the mixture of fuel and air, it will cause an explosion. The motorcycle starter works in the same way as the motorcycle starter. The starter consists of piston, cylinder block and cylinder head. The propelling piston moves up and down in the cylinder block. The valve then opens and closes so that the fuel air mixture enters the extinguishment chamber. The up and down movement of the piston drives the crankshaft to rotate, transforming the energy of the piston into rotary movement. The rotating force of the crankshaft is transmitted to the rear wheel of the motorcycle through the transmission. When the resistance frequency is 100 ± 1mm, the motorcycle pneumatic butterfly valve shall stop working performance test on a special test bench after stopping inspection and repair. The resistance of its stretching stroke and tightening stroke shall conform to the rules.
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Corrosion analysis of pneumatic butterfly valve
It was revealed that a pneumatic butterfly valve at the bypass of the bottom cut water tank of a naphtha oil tank in an oil refinery had an attack. The hose is used to extract crude oil from the tank bottom. The medium in the pipe is normal temperature naphtha consumed by another petrochemical plant, and the tank bottom pressure is hydrostatic pressure. The liquid height in the tank is about 17m, and the pressure is about 0.12MPa.
According to the response of workshop technicians, the over cutting work was not stopped for 299 days from November 2013 to November 2014. The tank was put into operation in 2009. In November 2013, it was revealed that the bypass occurred. At that time, the disposal method was to replace the pipe. From July to August 2014, this bypass was revealed again. The tank design is different from other tanks of the same batch, and there is flexible connection of pneumatic butterfly valve.
1 Macro appearance inspection
It can be seen from Figure 2 that the pneumatic butterfly valve is not installed horizontally. Take out the disclosed hose, remove the metal mesh on the surface, and observe that about three quarters of the bellows are intact, still retaining the metallic luster, and about one fifth is yellowish brown.
The area where corrosion occurs is directly below the bellows. There are corroded holes on the outer surface, and a large number of non corroded pits on the inner surface of the bellows. It is certain that the corrosion will gradually expand from the inner surface of the bellows to the outer surface.
(a) External surface morphology
(b) Internal surface morphology
(c) External surface corrosion perforation
2. Observation of micro morphology
2.1 Metallographic inspection
Take a sample at the perforated part of the bellows, turn over the hole along the perforation center, inlay the obtained sample, and stop the metallographic inspection of the obtained bellows according to the GB/T13299-1991 metal microstructure inspection method.
It can be seen from Figure 4 that the internal wall thickness of the bellows gradually decreases from the parallel section to the wave valley, where there are corrosion holes. The holes expand from the inside to the outside, and multiple corrosion pits can be seen on the internal surface.
It can be confirmed from Figure 5-8 that the solution treatment of the materials for processing bellows has not been stopped.
The corrosion mostly develops along the deformed martensite, especially the dislocation extends into the grain. The metallographic examination near the edge of the corrosion pit shows that most of the corrosion is deformed martensite.
2.2 Scanning electron microscope inspection
Take a sample from the perforated part of the corrugated pipe, turn over the hole along the perforation center, clean the corrosion products covered on the surface of the corrosion pit with dilute sulfuric acid, and then make a sample for scanning electron microscope (SEM) observation. It can be seen from Figure 9 that the grains at the edge of the corrosion pit are corroded to different degrees. Dislocations and slip lines formed during deformation are clearly visible.
It can be seen from Table 1 that the corrosion products contain chlorine and sulfur in addition to the constituent elements of the metal material itself, the common elements in naphtha and the oxygen element in the air. Among them, the contents of chlorine and sulfur measured at the bottom of the pit are the highest.
Take the edge of corrugated pipe corrosion perforation and make metallographic inspection samples. Scanning electron microscope (SEM) was used to look for microcracks on the etched pit side of the polished metallographic samples. The energy spectrum analysis was stopped in the area within the box selected at the crack tip, and the measured wCl and wS were 1.46% and 3.58% respectively.
The energy spectrum analysis of the products attached to the inner surface of several corrosion pits of the pneumatic butterfly valve was stopped, and it was found that there was chlorine in many places, and there was also sulfur. Especially, the measured wCl at the crack tip is 1.46%.