Metering pump operating steps and precautions

The metering pump is a positive displacement pump. When using it, first check that the anchor bolts of the pump body and the lubricating oil level are normal, and crank the motor. After confirming that it is correct, open the inlet and outlet valves of the pump, start the motor, and then slowly adjust the stroke of the pump from 0, usually to 70~80%. Observe the outlet pressure, pressure pulse and flow rate, and then it is OK. The difference from the centrifugal pump is that the metering pump is a positive displacement pump and cannot hold pressure inside. Once the pressure is held, it will easily cause damage to the outlet pipeline and even cause equipment failure and accidents. Therefore, you must first open the inlet and outlet valves before starting the motor (while the centrifugal pump The pump opens the inlet valve first, then turns on the motor, and finally opens the outlet valve to adjust the flow rate.) When starting the motor, the stroke must be small, usually 0, and then increase the stroke. Do not adjust the stroke first and then start the motor, as this may easily damage the equipment.

Please tell me about the 2nd floor: 1. "And crank the motor." How to crank the metering pump? 2. If the outlet is not open when the centrifugal pump is started, the return line, which is the minimum flow line, must be opened. This post was last edited by WSL01218 on 2008-7-10 15:08 ]

What are the operating steps and precautions for centrifugal pumps?

Preparation before starting: 1. Test whether the motor rotation is correct (in line with the direction marked on the pump body). The test time should be short to avoid dry wear of the internal parts of the pump. 2. Open the exhaust valve to fill the entire pump body with liquid, and close the exhaust valve when it is full. 3. Check whether all parts are normal. 4. The high-temperature type should be preheated first with a heating speed of 50. C/hour to ensure that all parts are heated evenly. start: 1. Close the pump outlet valve. 2. Fully open the pump inlet valve. 3. Start the motor and observe whether the pump operates correctly. 4. Adjust the opening of the outlet valve to meet the required working conditions. If the user installs a flow meter or pressure gauge at the pump outlet, the opening of the outlet valve should be adjusted to make the pump operate at the rated point listed in the performance parameter table. If the user does not install a flow meter or pressure gauge at the pump outlet, the opening of the outlet valve should be adjusted. ； Measure the motor current of the pump and make sure the motor runs within the rated current. Otherwise, the pump will be overloaded (that is, running at a high current, which will cause the motor to burn out). The opening of the properly adjusted outlet valve is related to the working conditions of the pipeline. 5. Check the shaft seal leakage. Normally the mechanical seal leakage should be less than 3 drops/min. 6. Check the motor, the temperature rise at the bearing is ≤80. C. shutdown: 1. Close the outlet pipeline valve. 2. Stop the motor. 3. Close the inlet and outlet valves. 4. If the machine is parked for a long time, all the liquid in the pump should be drained. How does a centrifugal pump work? answer: The centrifugal pump relies on the action of the rotating impeller on the liquid to transfer the mechanical energy of the prime mover to the liquid. Due to the action of the centrifugal pump, when the liquid flows from the impeller inlet to the outlet, its speed energy and pressure energy are increased. The liquid discharged by the impeller passes through the pressure chamber, and most of the velocity energy is converted into pressure energy and then transported out along the discharge pipeline. At this time, a vacuum or low pressure is formed at the impeller inlet due to the discharge of liquid. The liquid in the suction pool is forced into the inlet of the impeller under the action of liquid surface pressure (atmospheric pressure). Therefore, the rotating impeller continuously sucks in and discharges liquid.

Before use, it should be continuously calibrated for a period of time to determine the flow deviation. .

Metering pump operating steps and precautions

1. Inspection before starting 1. Check that the grounding wire of the motor must be tight and reliable. 2. Check that all screws are not loose and that the protective cover is fully tightened. 3. Check all pipeline joints and plugs. They should be well connected and without leakage. 4. Check whether the pressure gauge is easy to use. 5. Check that lubricating oil (46# turbine oil) is added to the pump gear box. The oil level is in the middle of the oil mark on the sight glass. 6. Check whether the metering pump stroke knob is flexible and easy to use, and adjust it to the 50% position. 7. Remove the motor fan and turn it while observing the reciprocating movement of the plunger for more than two strokes. There are no abnormal sounds and phenomena such as looseness, jamming, impact, etc. in each moving part, and then adjust the metering knob to zero (0%). 8. Check whether the process conditions are met and whether the outlet safety valve has been put into use. 2. Start the pump program: 1. Open the inlet valve of the pump, introduce liquid into the pump, and exhaust. 2. Fully open the outlet valve of the pump. 3. Turn on the power and start the motor. 4. Adjust the metering knob to make the pump reach normal flow. When rotating the adjustment meter, be careful not to move it too fast or too slowly, and adjust it in the direction from small flow rate to large flow rate. If it is necessary to adjust from a large flow rate to a small flow rate, the adjustment table should be rotated through a few grids, and then rotated in the direction of large flow rate to the scale. 5. After the adjustment is completed, tighten it with the locking screw to prevent loosening. If a rotary scale handle is used, the locking screw should also be tightened after adjustment. (Note: When adjusting the stroke, for a diaphragm pump, turn the handwheel clockwise to increase the stroke, and turn it counterclockwise to decrease the stroke. For plunger pumps, loosen the set screw and turn the adjustment cap. Turn clockwise, the stroke decreases. Rotate counterclockwise. The stroke increases. ) 3. Pump replacement and pump stop procedures: 1. The pump to be switched must be inspected and prepared before starting the pump. 2. Start the backup pump according to the normal pump starting procedure. 3. After the pressure and flow rate of the pump to be switched are normal, stop the pump to be switched. 4. When stopping the pump, first open the vent valve, then adjust the adjustment meter pointer back to zero, then stop the motor, and close the inlet and outlet valves and pressure gauge valves of the pump. 4. Inspection during operation: 1. Check whether the pressure and flow of the pump are normal. 2. Check whether the vibration and sound of the pump are normal. 3. Check that the packing gland is not too tight and the leakage is less than 2 drops per minute. 4. The motor bearing temperature shall not exceed 70°C. 5. The temperature of the pump bearings shall not exceed 65°C. 6. Check the lubricating oil level and whether it has deteriorated. 7. Keep the pump clean and sanitation, and make various records according to the prescribed time. 5. Pump maintenance: 1. Clean the inlet and outlet valves regularly to avoid clogging and affecting measurement accuracy. ； When reassembly, pay attention to the upper and lower valve seats and valve sleeves, and do not install them upside down or incorrectly. 2. The specified amount of pure oil should always be maintained in the pump case, and attention should be paid to timely oil changes. Regular oil changes refer to the following table for the service life. After the first operation, the oil change cycle is 300 hours, and the oil is changed once every 4,000 hours. 3. If the pump is out of service for a long time, the medium in the pump cylinder should be drained clean, and continue to work with methanol or other cleaning fluids for five minutes. Seal the inlet and outlet. The exposed processing surface should be coated with anti-rust oil. During the storage period, it should be placed in a dry place and covered with a cover.

Good stuff, I need information on this

How do you adjust a pulse pump like this?

Great information, thanks for sharing! ! :P:P:P