The latest valve technology is cleaner and smoothe

2022-10-03
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The new valve technology is cleaner and smoother

traditional valves, such as butterfly valves, slide valves and gate valves, have problems in hygiene and flow resistance when discharging powder. Usually, all these equipment are placed at the bottom of rigid semi-finished product bulk containers (ribc), hoppers, feeders or silos, and many parts are immersed in powder. The characteristics of powder make it difficult for it to flow smoothly through the valve, which often leads to bridging, voiding or rushing. Bridging occurs when the powder is accumulated on both sides of the valve and does not flow. The cavity is also caused by the retention of powder, and a small hole will be left in the middle, and the powder will flow out of the hole. The opposite phenomenon to the backlog and poor flow of powder is rush, which can not control the flow of powder

blanking auxiliary equipment

in order to avoid bridging and the formation of cavities, vibrators or air cannons are added to the container wall or hopper. Sometimes an operator may be seen near the hopper knocking one side of the hopper with a hammer. Although these methods are helpful to the flow of powder, but the profit is higher, they often worsen the situation and produce new backlog, agglomeration or rush. And it is easy to bring noise pollution and damage to the feeder

in addition, there is a hopper shaker that can help reduce the flow problem, but its disadvantage is that there is no valve to stop the powder flow, and there is no instrument to control the flow. A fully designed system with hopper shaker should also include blocking valves and metering equipment or feeders. But this requires more overhead space, more maintenance and more costs

conical valve technology

in the early 1980s, conical valve technology entered the market, integrating the advantages of improving flow and some characteristics of traditional valves. One of the leading enterprises in the industry, material control engineering company has made meimeike win the favor of some cell factories in the first and second echelons in China. Now, matcon company has introduced the integrated technology of comprehensive measurement, unloading and valve, which has evolved into today's matcon conical valve. Ivan semenenko, the inventor and founder of conical valve, is a key figure in pushing this technology to the forefront of powder processing

this equipment includes a pneumatic conical inner layer, which plays the role of destroying the bridge when lifting, and plays the role of a valve when it is tightly closed with the ribc container when lowering. The flow can be controlled by controlling the lifting frequency of the conical valve

The growth rate of gross output value is much higher than the average development speed of the national economy. In the 1980s, due to the emergence of many imitators and competitors, this technology gradually lost its market. It is only a transition between the unloader and the traditional valve, and the early equipment still has some inherent problems. Ideally, the valve should be as simple as possible, with fewer components, and isolated from the powder flow. However, in the design of matcon and other companies, nearly 100 parts are in contact with the powder flow, which is easy to cause product pollution and cross contamination

since many components are immersed in the powder stream, the probability of failure is high, and the early design requires a lot of maintenance. Another major problem is that the conical layer may have slight movement, which destroys the tightness with the ribc nozzle

new technology

18 years later Ivan semenenko founded a new company to study the inherent problems of early conical valves. Semenenko's company ISL cone valve spent two years developing a new type of conical valve technology, which solved the original problem

The new design includes a conical valve and a transfer hopper. The valve is placed in the ribc or hopper, and the nozzle of the ribc is equipped with a sanitary gasket. At the same time, a transfer hopper including an expansion device and a probe is part of the unloading station. When the ribc drops, the expansion equipment will vertically lift the probe to lift the conical valve, so that the powder can flow through the transfer hopper without contacting the valve, thus avoiding valve pollution

precautions for Semene using electronic tensile testing machine NKO simplifies the design, reduces the need for maintenance, and simplifies the number of components to only six. A maintenance worker can complete the disassembly and removal work in just a few minutes, while the traditional conical valve takes several hours. This new conical valve has no mechanical parts immersed in the powder flow, no inclined leakage, and the flow is variable

for traditional valves, whether butterfly valve, rotary valve, iris valve or other types, there is a phenomenon that the valve is difficult to close when the powder flow impulse is large, which makes the powder flow out continuously

the conical valve solves this problem by applying gravity. The impulse of powder flow helps to close the valve, but the old conical valve will also have trickle at the outer edge

before completely closing the valve, the new conical valve should be lowered to only 15mm away from the edge, and then completely close the valve after the residual powder below flows away, so as to avoid leakage

the valve uses a simple external sensor to change the lifting height of the cone layer, and has the function of continuous adjustment. Auxiliary adjustment can be made according to specific conditions, such as for viscous powder that is not easy to cut

scope of application

the vast majority of ribc systems used in the pharmaceutical, food and chemical industries will use conical valves. In addition to being used in hoppers and silos, ISL cone valve technology has recently been used in bulk container systems (FIBCs). Through cooperation with various bulk bag manufacturers, ISL is pushing the conical valve technology to a broader powder processing industry. Users of both new and old equipment can benefit from this new technology. With little change, the new conical valve upgrade assembly can be installed to achieve the same use effect as the new equipment

due to this simple and clean conical valve design, this equipment is very suitable for the food and pharmaceutical industries. In addition, conical valves have been used in the chemical and plastic industries

conclusion

the new conical valve meets the requirements of less maintenance, less faults, metrology and full sealing, and eliminates the users' worries about faults

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