Self-priming centrifugal pumps in the fuel pump fuel volume adjustment mechanism, in addition to the rack-and-pinion-type fuel control mechanism, there is a kind of fork type oil control mechanism. In the lower end of the plunger there is a regulating arm, adjust the arm end of the ball placed in the adjustment fork groove, ball seat wear, the ball can be placed on a valve seat, and then tap the metal ball gently Until the ball valve and seat close together so far. If the valve seat is worn seriously, first remove the worn marks by reaming, and then use the method to make it close. Plunger seat wear, self-priming centrifugal plunger plunger upward movement, the pressure process continues until the helical bevel on the plunger to open the plunger sleeve back to the oil hole so far, when the hole is opened, High-pressure oil flows back from the oil chamber through the longitudinal groove in the plunger and the oil return hole in the plunger sleeve to the oil passage in the pump body. Self-priming centrifugal pump boom technology is a key technology of concrete pump truck. SANY Heavy Industry Co., Ltd. finally succeeded in developing China's first 37-meter self-owned intellectual property right in 1998 through painstaking research and innovation. Boom pump truck. The length and diameter of the high-pressure tubing are selected after measurement, can not be arbitrarily changed. Multi-cylinder injection pump calibration, you must ensure that the same high-pressure tubing diameter and length, the use of points. Self-priming centrifugal pump based on the specific requirements and high lift head, flow is small and not suitable for small flow high-lift centrifugal pump can be used, you can choose reciprocating pump, such as cavitation less demanding can also use the vortex pump, lift Very low, traffic is large, the choice of axial flow pump and mixed flow pump. Self-priming centrifugal pump When the concrete gear pump hydraulic system set sequence valve, we must understand the working characteristics of the sequence valve, the correct sequence valve working pressure. The greater the angle the plunger does not rotate, the greater the distance between the upper end of the plunger and the hypotenuse of the oil return hole of the plunger sleeve, the larger the oil supply. If the plunger rotation angle is greater Small, the oil cut started earlier, the fuel supply is also smaller. Self-priming centrifugal pumps in both low and high load are in the vicinity of the stop point. This method of adjustment applies to high supercharged and speed and load changes on marine diesel engines. Self-priming centrifugal pump helical teeth, herringbone teeth, helical teeth, tooth profile involute and arc type. Usually small gear pump more use of involute spur gear, high temperature gear pump often use variable gear, conveying high viscosity, high pressure melt polymer melt more use of involute helical gears. Self-priming centrifugal pump according to the nature of the liquid medium to determine the water pump, hot water pump or oil pump, chemical pump / corrosion-resistant pump, impurity pump or non-clogging pump installed in the explosive area of ​​the pump, explosion area should be based on the level of the corresponding explosion Motor. Self-priming centrifugal pump long liquid gradually developed into a domestic Komatsu engineering gear pump research and development production center, product development to nine major categories of 200 varieties, was named "Shanxi famous brand products", the national gear pump industry, "Top Ten customer satisfaction products" Top Ten Best Sellers. Self-priming centrifugal pump factory has been adjusted before leaving, not arbitrary high-profile, need to re-adjust, you must use the pressure gauge. Because of its use of today's most advanced frequency control technology, making the series of test stands on the market compared with the power of other types of products have obvious technical advantages and strong competitiveness. Self-priming centrifugal pump using the pump characteristic curve, find the required flow value on the abscissa, the required value of the lift found on the ordinate, from the two values ​​were drawn up and down, respectively, vertical or horizontal line, intersection of two lines just fall on Characteristic curve, self-priming centrifugal pump high-pressure tubing length and diameter are selected after calculation, can not be arbitrarily changed. Multi-cylinder injection pump calibration, you must ensure that the same high-pressure tubing diameter and length, the use of points. For open-air or semi-open-air pumps, the pump is generally perpendicular to the axis of the prime mover and to the pipe gallery axis. For indoor layout of the pump, when the delivery of liquid temperature is higher than the natural point or the liquid is liquid hydrocarbons, should be arranged separately with the other pump Miscellaneous room. The instrument box has the test rig's main operation control mechanism, with the host positive, reverse start, stop the switch; the amount of oil count control switch; speed, counting, temperature, pressure rack travel, spindle rotation angle display, Speed ​​preset institutions. Gear pump hydraulic system heating, a direct impact on the normal operation of concrete gear pump, the harm caused by the phenomenon of heat, mainly in the following points: the temperature of the working fluid increases, the viscosity of the working fluid decreased gear pump leakage increased since Suction centrifugal pump has plenty of liquid to fill just off the meshing gear root, greatly improving the self-suction gear pump performance, to avoid the phenomenon of suction, not only can improve the volumetric efficiency, but also help to reduce cavitation and reduce noise .