During the maintenance and testing of the two pumping units at Yangzhou No. 2 Power Plant, an initial increase in vibration was observed. However, after a certain period, the vibration levels gradually decreased and eventually stabilized. This process highlights the importance of careful handling during the disassembly and reassembly of the upper frame and the lifting of the entire motor. These operations can significantly impact critical motor parameters, such as oil clearance and air gap alignment. In more severe cases, uneven oil distribution or improper air gaps may occur, which could affect the overall performance and stability of the unit.
To ensure proper alignment, it is necessary to measure the concentricity between the thrust head and the upper cylinder—specifically, the distance between the thrust head journal and the machined surface of the upper cylinder. Additionally, the air gap should be checked thoroughly. If any significant deviation is detected, appropriate adjustments must be made to restore proper alignment and prevent future issues.
The coupling bolts between the motor and the water pump are typically tightened using a torque wrench to ensure uniform pressure. Similarly, the motor base bolts should be tightened by the same person to maintain consistency in the tightening force. It's crucial that the bolts are tightened evenly and symmetrically in all directions. In practice, the sequence in which bolts are tightened and the amount of force applied can influence the horizontal and angular alignment of the shaft. This effect is more pronounced in long, slender shafts, where even small changes in bolt tightness can lead to noticeable shifts in the swing or runout.
Another important aspect is the positioning pin between the upper frame and the base, as well as between the motor and the base. These pins must be placed back in their original positions and never moved or misplaced. When reinserting the locating pin, it should be turned so that it naturally falls into the deepest possible position before being secured. After prolonged operation, the positioning pin and its corresponding hole have achieved a precise fit. If the pin is not correctly positioned, it could cause misalignment of the motor, which might compromise the level and concentricity of the fixed components. Ensuring accurate placement of these pins is essential for maintaining the integrity and performance of the entire system.
Pneumatic Piston Valve
Pneumatic Piston Valve, also known as air operated piston valve is designed to function effectively in a wide range of high demanding industry applications. Often used in applications where there is excess ambient temperature or high-pressure steam duty, air operated valves are multifunctional and can be used with varying media, including: air, water, hydraulic oil and steam.
In order to allow the valves to operate effectively with dangerous media, the piston valve material has to be durable. Air operated valves from BRANDO are manufactured from only the most hard-wearing and robust material selection, including bronze, brass and stainless steel. These materials are recognised for their ability to operate in hazardous environments without damaging the service life of the valve.
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