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Variable pump pressure adjustment steps

　　1) Adjust the pressure of unloading valve DA10, relief valve DB10 or DB20 to the minimum. 　　 2) Check in the slurry inlet valve and close the slurry outlet valve to the minimum, that is, the slurry flow rate of the pump is small at this time. 　　 3) Start the motor, slowly adjust the relief valve DB10 or DB20 to adjust the mud pressure to be about 0.1Mpa-0.2Mpa less than the required pressure. 　　 4) Slowly adjust the unloading valve DA10 until the unloading valve has pressure (that is, the pressure gauge corresponding to the unloading valve shows less than 0Mpa). 　　 5) If the state cannot be reached, adjust the unloading valve and the relief valve according to the above steps 3 and 4 until this state. 　　 6) After adjusting the unloading valve, tighten the nut. (Note: The pressure of the unloading valve should be zero at this time, if it is not zero, then slightly lower the pressure of the unloading valve, and the pressure will only be displayed when it reaches zero). 　　 ...
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Reasons for Axis Breakage of Water Ring Vacuum Pump and Corresponding Measures

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Axis Breakage of Water Ring Vacuum Pump: After 2 years of use, water ring vacuum pump will present the phenomenon of excessive noise, excessive starting current, remarkable decrease in pumping capacity and vacuum degree. It is found that the scale inside the pump body is severe after the technical staff of our company disassembled and inspected. The reason for scaling is that the water contains calcium, magnesium and other carbonate substances. When the pump is heated and heated, its solubility decreases, and molecule-bound deposits form scales. What measures should be adopted to avoid axle breakage? Water ring vacuum pump Through the analysis of the causes of shaft breakage of water ring pump, the following corresponding measures are adopted. 1. Revamping the original process equipment to reduce the content of impurities in acetylene gas trap: At the same time, the large well water of water ring vacuum pump is changed into circulating water to reduce the hardness of wat...
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HEAT TREATMENT PROCESS AND APPLICATION OF DIE CASTING DIE

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Metal die casting has the characteristics of high production efficiency, saving raw materials, reducing production cost, good performance and high accuracy, which has been widely used in production.  Die casting mould of the surface of the work, direct contact with the liquid metal, under high pressure and high speed flow of liquid metal erosion and heating, after the workpiece demoulding, and rapid cooling, therefore, thermal fatigue cracking, thermal wear and hot melt erosion is a common failure forms of die casting mould, so, for die casting die with cold and hot fatigue resistance, high temperature strength and toughness, liquid metal erosion resistance, high heat resistance and high thermal conductivity, good oxidation resistance and high hardenability and wear resistance, etc.  Heat treatment is an important step to improve die life. The investigation shows that the failure of the mold due to heat treatment or improper operation accounts for about 60% of the total fai...
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