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Selection of Metering Pumps
First, determine the pressure requirement. The rated pressure of the selected metering pump should be slightly higher than the actual maximum pressure needed—by about 10 to 20%. Avoid choosing a pump with excessively high pressure, as this may result in wasted energy and unnecessary investment in both equipment and operations.
Second, consider the flow rate. The selected metering pump’s flow rate should be equal to or slightly greater than the required process flow rate. Ideally, the flow rate should fall within the range of 30% to 100% of the pump’s rated flow capacity. For optimal economic and practical performance, it is recommended that the actual required flow rate be between 70% and 90% of the pump’s rated flow.
Third, choose the appropriate material for the hydraulic end. Once the specific model and specifications of the metering pump are determined, the material for the wetted parts should be selected based on the properties of the fluid being handled. Improper selection can lead to corrosion, damage to internal components, or even leakage and contamination. In severe cases, this could result in serious accidents.
Metering Pump Flow Control and Adjustment Methods
There are several methods for controlling and adjusting the flow of a metering pump, including adjusting the plunger or piston stroke, changing the pump speed, and using adjustable stroke mechanisms. Among these, stroke adjustment is the most commonly used method, especially when maintaining precision at low flow rates. There are three main types of stroke adjustment:
1. Manual adjustment during shutdown: This involves manually adjusting the pump’s stroke when the system is not in operation.
2. Manual adjustment during operation: This method adjusts the axial displacement while the pump is running, which changes the crank radius to modify the stroke length. Common techniques include N-shaped crankshaft adjustment, L-shaped crankshaft adjustment, and eccentric cam adjustment.
3. Automatic adjustment during operation: This can be achieved through either pneumatic or electric control. Pneumatic control uses air pressure signals to adjust the stroke automatically, while electric control utilizes electrical signals for the same purpose.
Metering Pump Control: Precise machining ensures accurate delivery of the medium with each pumping cycle. The volumetric flow rate of the pump output is directly proportional to the stroke length and the reciprocating frequency (pump speed) at a given effective plunger area.
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China Hardware Business Network
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Editor: (Hardware Business Network Information Center)
http://news.chinawj.com.cn
Metering pump selection and flow control method
When selecting a metering pump, it is essential to ensure that its rated pressure is slightly higher than the actual maximum pressure required—ideally by 10 to 20%. Choosing a pump with excessive pressure can lead to unnecessary energy consumption, increased equipment costs, and higher operational expenses. It's important to strike a balance between performance and efficiency.