Metrology pump purchase Raiders: understand it choose it

Dosing pump is designed for measuring the liquid pump. Most metering pumps use the construction of piston and diaphragm pumps and are also useful gear pump constructions because they maintain a constant flow independent of discharge pressure. There are a lot of skills and knowledge in the selection of metering pumps, the current shopping guide editor take you slowly "study" several metering pump products, hoping to help your selection.

There are two kinds of metering pump flow can be adjusted and not adjustable? The former is more applicable. The flow rate is mainly adjusted by changing the stroke length, such as changing the crank radius, the position of the backstop at the plunger return and the gap between the plunger rod and the crosshead, and the flow rate can also be adjusted by changing the reciprocating frequency or both. Although the stroke length can be adjusted from zero to maximum, but to ensure the measurement accuracy? Are generally limited to 30 ~ 100% range. Metering pump metering accuracy refers to the accuracy of flow reproducibility? Usually calculated by the maximum flow. In the 10 ~ 100% adjustment range? General metering pump metering accuracy of ± 1% (special metering pump accuracy is higher).

Metering pump according to the different parts of the flow can be divided into plunger metering pumps, mechanical diaphragm metering pumps, hydraulic diaphragm metering pumps, bellows metering pumps. Here, we have different pumps for you to introduce several recommended HC products, and to make a summary of this type of metering pump.

First, the plunger metering pump

Features:

1, the price is lower.

2, flow up to 76m³ / h, the flow rate in the range of 10% to 100%, measurement accuracy of ± 1%, the maximum pressure up to 350MPa. When the outlet pressure changes, the flow rate is almost unchanged.

3, can transport high viscosity medium, not suitable for conveying corrosive slurry and dangerous chemicals.

4, the shaft seal for the packing seal, there is leakage, the need to periodically adjust the packing. Filler and plunger wear, need to be pressure ring flushing and discharge packing.

5, no safety relief device.

Recommended businesses: Zhejiang love Pu Pump Co., Ltd.

product description:

1, using a fixed eccentric machine into

2, precision casting shell, bronze worm wheel and wear-resistant ball bearings, lubricating oil lubrication of all drive parts

3, pump head and power box completely separate correctly, to prevent the power box may cause corrosion

4, the pump head can also be electric heating type, the temperature can be set arbitrarily

5, reasonable structure, reliable performance, stable operation, easy adjustment, easy maintenance.

The main purpose:

JX series plunger metering pump, is a can according to process requirements, with travel in the range of 0 ~ 100% steplessly adjust the quantitative delivery of a variety of liquids, and in the maximum stroke of the medium being conveyed measurement accuracy of ± 1 % Of the general machinery and equipment. Metering pump flow range of 0.8 ~ 200L / h, suitable for conveying temperature of -30 ~ 120 ℃, viscosity of 0.3 ~ 800mm2 / s without solid particles of the media.

Second, the mechanical diaphragm metering pump

Features:

1, the price is lower.

2, no seal, no leakage.

3, can transport high-viscosity media, abrasive slurry and hazardous chemicals.

4, the diaphragm withstand high stress, lower diaphragm life.

5, the outlet pressure below 2MPa, the flow of a smaller scope; measurement accuracy of ± 5%, when the pressure from the smallest to the largest, the flow changes up to 10%.

6, no safety relief device.

Recommended businesses: Dongguan City Shuangfeng Water Treatment Equipment Co., Ltd.

Third, the hydraulic diaphragm metering pump

Features:

1, no passive seal, no leakage, safety relief device, easy maintenance.

2, pressure up to 35MPa; flow rate in the range of 10: 1, measurement accuracy of ± 1%; pressure increased by 6.9MPa, the flow decreased by 5% to 10%.

3, the higher the price.

4, suitable for medium viscosity medium.

Recommended businesses: Guannan Xiangyang Chemical Machinery Factory

Xiangyang JW hydraulic diaphragm metering pump

product description:

1, small size, light weight;

2, the maximum flow 40L / h, the maximum pressure 5Mpa;

3, for purification, Sewage Treatment, laboratories, laboratories;

4, motor power: 0.25KW speed: 1400r / min

Shuangfeng 150 series mechanical diaphragm metering pump four, bellows metering pump

Features:

1, the price is lower.

2, no seal, no leakage.

3, the most suitable for conveying vacuum, high temperature, low temperature medium, the outlet pressure 0.4MPaG the following, the measurement accuracy is low.

Recommended businesses: Shanghai Bosheng Pump Manufacturing Co., Ltd.

09050DZ, DS new bellows liquid metering pump

product description:

1, no leakage: no mechanical seal, so there is no leakage.

2, output accuracy: water conditions, can be ± 1.5% of the high-precision.

3, can self-absorption: room temperature water conditions, the suction is 1 meter.

4, to allow dry running: working chamber for the bellows, which can dry run.

5, long life: This cavity is made of polypropylene with special anti-tortuous materials, can withstand millions of times reciprocating motion.

6, good corrosion resistance: the pump body made of polypropylene, the valve used a special formula FPM, EPDM, resistant to all kinds of acid, alkali and other corrosive liquids.

7, the liquid temperature: the highest syrup temperature 60 ℃, more than 50 ℃, the maximum pressure of 20 ℃ when 1/2, more than 40 ℃ when the liquid corrosion will increase, be careful.

product description:

1, a unique design of independent camshaft, the largest independent output control

2, accurate measurement, the output can be adjusted

3, strong chemical resistance

4, economic and practical

5, metal reinforced diaphragm, long life

[Edit Summary] Understand the different characteristics and performance of various metering pumps, we finally summarize the process of selecting the metering pump several points of attention, I hope in the actual purchase to give you a reminder!

First, to determine the corrosion resistance of metering pumps: corrosion is one of the most headache hazards of chemical equipment, a little careless, ranging from damage to equipment, heavy cause accidents and even lead to disaster. According to the statistics, about 60% of the destruction of chemical equipment is caused by corrosion, so the selection of metering pumps must first pay attention to the scientific material selection.

Second, to determine the pressure: the selected pressure pump metering pressure to be slightly higher than the actual maximum pressure required, generally higher than 10 to 20%. Do not choose too high, the pressure is too high will waste energy, increase equipment investment and operating costs.

Third, determine the flow: The selected metering pump flow should be equal to or slightly greater than the flow of technology required. Dosing pump flow range of use in the metering pump rated flow range of 30 to 100% better, then the metering pump repeated reproduction of high precision. Considering economical and practical, it is suggested that the actual required flow rate of the metering pump should be selected to be 70-90% of the rated flow rate of the metering pump.

Fourth, to determine the pump head (hydraulic end) Material: metering pump specific model specifications are determined, and then select the over-flow medium according to the properties of the flow part of the material, this step is very important, if not properly selected, will result in medium corrosion damage Overcurrent components or media leak contaminated systems. Serious accidents may also result in serious problems, if you are not sure, please consult our company.

other aspects:

When you select the metering pump, you also need to consider the required metering pump accuracy level, the higher the level of precision into more.

Metering pump general operating temperature -30 ~ 100 ℃, special metering pump its working temperature range is wider (such as high temperature liquid metering pump with insulation jacket, the delivery temperature up to 500 ℃).

For media size, we require less than 0.1mm, for media greater than 0.1mm, we can be targeted to the pump overcurrent structure to meet the needs.

For medium viscosity, generally should be 0 ~ 1000mm / s, special metering pump up to 6000mm2 / s, my company has a high viscosity pump head.

The flow rate of a mechanical diaphragm metering pump is the maximum flow rate measured at a nominal pressure rating (when water is delivered at room temperature). If the pressure drops, the output flow will be higher than the nominal.

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