Causes of valve scratch:

先是閥門粘結(jié)磨損產(chǎn)生磨粒,此磨粒硬度強(qiáng)度都較基體金屬高,被壓入軟面而劃傷硬面,同時(shí),硬磨粒在軟面內(nèi)被硬面凸峰推擠而有移動(dòng)從而犁傷軟面。在磨擦面分開(kāi)后,磨?？赡芘懦?但也可能仍然存在于軟面上再次磨擦?xí)r又將劃傷硬面并在軟面上犁出更深更長(zhǎng)的深溝,直至硬粒前方的軟面抵抗不住硬粒的移動(dòng)力而被剪切,軟面上形成了條狀溝槽,硬面上形成了劃傷痕跡。

Firstly, the valve is bonded and worn to produce abrasive particles. The hardness and strength of the abrasive particles are higher than that of the base metal. They are pressed into the soft surface and scratch the hard surface. At the same time, the hard abrasive particles are pushed and moved by the convex peaks of the hard surface in the soft surface, thus ploughing the soft surface. After the friction surface is separated, the abrasive particles may be discharged, but they may still exist on the soft surface. When friction occurs again, the hard surface will be scratched and a deeper and longer deep groove will be ploughed on the soft surface until the soft surface in front of the hard particles cannot resist the moving force of the hard particles and is sheared. Strip grooves are formed on the soft surface and scratch marks are formed on the hard surface.

如果閥門載荷苛刻而接觸點(diǎn)少,則剪切強(qiáng)度變大磨屑也就變大如不及時(shí)排出,就壓入表面形成結(jié)節(jié),結(jié)節(jié)后接觸點(diǎn)剪切強(qiáng)度變大磨屑也變大終就形成了磨擦瘤。從小結(jié)節(jié)到磨擦瘤的過(guò)程是連鎖的逐漸增長(zhǎng)的,當(dāng)原有的移動(dòng)力不能剪斷磨擦瘤時(shí),咬擦傷也就發(fā)生。因此咬擦傷在某種程度上是磨損的一種形式。

If the valve load is harsh and there are few contact points, the shear strength becomes larger and the wear debris becomes larger. If it is not discharged in time, it will be pressed into the surface to form a nodule. After the nodule, the shear strength of the contact point becomes larger and the wear debris becomes larger, which eventually forms a friction tumor. The process from small nodule to friction tumor is a chain of gradual growth. When the original moving force can not cut the friction tumor, the bite scratch will also occur. Therefore, bite abrasion is a form of wear to some extent.

其次閥門是閥杄可能與填料壓套、填料墊相碰擦,再有是介質(zhì)中如含有硼,則它泄出后會(huì)結(jié)晶成硬粒,拉傷閥桿表面,再有是應(yīng)加潤(rùn)滑劑的部分未加潤(rùn)滑劑等。

Secondly, the valve may collide with the packing sleeve and packing pad. Secondly, if boron is contained in the medium, it will crystallize into hard particles after being discharged, which will damage the valve stem surface. Thirdly, the parts that should be lubricated are not lubricated.

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