During dispersion, solid particles in between the guiding surfaces of the pumps can lead to jamming of the movable closing unit. If solid particles are trapped, this prevents the complete closing of a valve. Thus, the fluid can flow back through the remaining gap. If the valve opens only slightly (e.g., with very small stroke lengths or high spring load), solid particles larger than the opening gap may not pass of i.e. a valve.
At low flow velocities (small stroke length, small stroke frequency), solid particles can be deposited in the flow dead spaces of the valve. The consequences of this are non-constant flow rate, increased wear, increase in pressure loss, reduced flow rate up to the failure of a pump.
The following solutions are offered by LEWA diaphragm metering pumps with suspension valves for dispersing:
Dispersing – what is it?
If two substances cannot be dissolved in each other or chemically combined, they form an interface. This interface prevents the formation of a dispersion, a heterogeneous mixture of two substances. If these substances are to be mixed together, dispersing is applied. This causes the enlargement of the boundary surfaces, which effectuates a balance of the two substances to be mixed.
More precisely, this is a momentary comminution of the liquid and the solid particles to almost the same size. In addition, long-term stability of the dispersion can be achieved by using emulsifiers and stabilizers.
When critical, environmentally hazardous, toxic, or flammable fluids and suspensions need to be reliably conveyed or metered in high-pressure processes, there is no alternative to hermetically sealed metering pumps, process diaphragm pumps, and metering systems from LEWA. Hermetically sealed LEWA pumps with pressures up to 1200 bar are the first choice for the production of chemical intermediate and end products. Contact our experts and let us advise you about your individual chemical pump or system solution!More Details
As the leading manufacturer of pumps and pump systems for the pharmaceutical, life sciences, and biotechnology industries, LEWA supports you during the development of complete solutions, which meet your process requirements exactly. Special expertise is required in the production of pharmaceuticals in order to ensure that legal requirements are met. Reliability when it comes to production, documentation, and validation are our top priorities.More Details
LEWA supports producers and plant construction companies in the food and beverage industries with pumps and systems for homogenization and dispersion, as well as for other processing operations in the food industry. We work with you to plan all the important process-related operations, such as conveying, metering, mixing, heating, and cooling so that you can process your raw product cost-effectively.More Details
LEWA offers customized solutions and references for almost all industries in which processes require exact metering or the reliable conveyance of fluids. As specialists in fluid handling, we of course also have experience in areas outside of our key markets.More Details
LEWA ecoflow is the innovative and universal metering pump with DPS diaphragm protection system in a tried-and-tested modular system. Suitable for numerous applications, the ecoflow is our real all-around talent, relied on by customers from all industries.More Details
LEWA ecoflow is also available in sanitary/hygienic. The metering pump for hygienic applications has the same all-around capabilities and fulfills all specifications for pharmaceutical and food production.More Details
A sanitary/hygienic version is also available for the LEWA ecodos. Here, we meet all requirements for operation in pharmaceutical and food production.More Details
Customer-specific batch/continuous systems for your production process. Metering, mixing, filling, separating, controlling temperature: We work with you to develop the ideal process-related sequence and produce the system that fits your production process – right up to the end product.More Details