1. During the maintenance of mixer truck, if the valve is ablated, pitted and sunken, it shall be polished, which is generally carried out on the grinder. Four problems need to be paid attention to during operation: first, ensure that the valve head is concentric with the rod, otherwise it shall be straightened first; Second, on the premise that the smooth grinding vehicle can grind a complete cone, the smaller the better; Third, try to improve the surface finish; Fourth, the depression at the end of the valve stem shall be ground flat.

2、氣門導(dǎo)管的鉸銷氣門桿與氣門導(dǎo)管配合間隙是決定氣門導(dǎo)管使用壽命的關(guān)鍵，因此當(dāng)更換新的氣門導(dǎo)管時(shí)，鉸銷時(shí)應(yīng)嚴(yán)格掌握好配合間隙，使用各攪拌車車型規(guī)定間隙的下限，可有效延長(zhǎng)使用壽命。

2. The fit clearance between the hinge pin valve stem and the valve guide of the valve guide is the key to determine the service life of the valve guide. Therefore, when replacing the new valve guide, the fit clearance shall be strictly controlled when the hinge pin is used, and the lower limit of the clearance shall be specified for each mixer model, which can effectively prolong the service life.

3、氣門的研磨氣門的研磨分為兩種情況：一是氣門與氣門座只有輕微麻點(diǎn)，不需要光磨和鉸銷時(shí)的研磨；二是氣門與氣門座均經(jīng)過(guò)光磨和鉸銷后的研磨。前者先用足金鋼砂研磨，將麻點(diǎn)研磨掉后，再用細(xì)金剛砂研磨，涂上機(jī)油研磨，直密封符合要求，寬度符合規(guī)定為止。后者只有密封性達(dá)不到要求時(shí)才進(jìn)行研磨，但操作時(shí)要注意，不要過(guò)分用力，嚴(yán)禁將氣門上下敲打，否則將出現(xiàn)凹形砂痕，影響維修質(zhì)量。

3. Valve grinding valve grinding can be divided into two situations: first, there are only slight pits between the valve and the valve seat, and there is no need for smooth grinding and grinding during hinge pin; Second, the valve and valve seat are ground after smooth grinding and hinge pin. The former shall be grinded with full gold steel sand first, and then the pitting shall be grinded off, and then grinded with fine emery and coated with engine oil until the sealing meets the requirements and the width meets the regulations. The latter can only be grinded when the sealing performance fails to meet the requirements, but pay attention not to use excessive force during operation. It is strictly prohibited to knock the valve up and down, otherwise concave sand marks will appear, affecting the maintenance quality.

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