Global Processing

Silence is golden

At Langguth Chemie, pump solution optimizes filling operations while reducing noise 

1963 by Rudolf Langguth. The company produces cleaners, disinfectants and detergents for commercial and industrial applications, as well

Langguth Chemie GmbH, Konigsbrunn, Germany, was founded in 1963 by Rudolf Langguth. The company produces cleaners, disinfectants and detergents for commercial and industrial applications, as well as soaps, lotions, shower gels and hand sanitizers. In addition to its own brands, it furnishes private-label brands.

The future of Langguth Chemie, however, came into question in 1993 when Rudolf Langguth passed away. Rudolf ’s son, Klaus Langguth, stepped in and continues to operate the company.

“This company started as a one-man operation, so we had some struggles with my father’s illness and death,” says Klaus Langguth, who is today the company’s managing director. “We develop everything on our own, manufacture everything on our own. We buy only raw materials and develop the product, test the product and sell the product to our distributors and private-label partners.”

Filled with frustration

Langguth Chemie also faced challenges in optimizing cost-effectiveness of its production and product-transfer operations. Of concern was packaging where finished cleaners, detergents, disinfectants, soaps, lotions, etc., are pumped from 6,000-liter holding tanks into containers — which generally range in size from 5 to 10 liters —before being shipped to the end-user.

Pumps transfer exact volumes while operating reliably in demanding start/stop conditions. Pumps inject the appropriate volume and then stop immediately, a challenge in these operations.

For years, Langguth Chemie used plastic air-operated double-diaphragm (AODD) pump technology. But the pumps didn’t live up to expectations in two areas — pumping high-viscosity liquids against pressure air consumption and noise generation.

“We needed a reliable pump system that has high suction capabilities when pumping against pressure, with high-viscosity liquids, and that wouldn’t get dry when pumping out of containers,” explains Langguth. “We tried other pumps, but they took too much air in order to work, and they were loud, difficult to maintain and unreliable.”

Complete commitment

Part of PSG, a Dover Co., Almatec is a leading brand of AODD pumps, manufactured in PSG’s Kamp-Lintfort, Germany, facility.

E-Series air-operated double-diaphragm pumps are a next-generation technology that has replaced Almatec’s standard-setting A-Series AODD pump line. Advances include a diaphragm-sized ring on each side of the pump that allows a series of housing bolts to be tightened against the housing, resulting in a more even spreading of housing-bolt force; an optimized flow pattern that decreases resistance and increases energy efficiency; and the use of less air to achieve the same level of flow.

Langguth Chemie employs eight E40 models in its container-filling operation, even though they have a higher purchase price than the old pumps. That higher price is negated by air consumption, maintenance and downtime cost reduction.

“The mechanical parts are more stable in these pumps. They hold the air pressure better and longer so the air consumption is lower,” Langguth says. “It’s a theoretical level of 50% less air consumption and I think in practical usage we are receiving, without any effect on flow rates, a 30% to 50% increase in seal-ability. The old pumps needed too much air, about double what the Almatec needs. With the old pumps we were probably going to need a new compressor.”

About those pumps

E40 pumps feature solid-block polyethylene (PE) construction (as opposed to the molded-plastic construction of the older pumps), have a 38 mm port size, dry-suction lift of up to 4 m, wet-suction lift to 9.5 m, maximum operating pressures of 7 bar and can function with fluid temperatures up to 70ºC. Standard diaphragms are PTFE (Teflon), but after several months of use, Langguth Chemie has determined that the same, if not higher, level of pump performance can be achieved with the incorporation of EPDM diaphragms.

“When handling soaps and other cleaners, oftentimes the ingredients are surfactants that can crack plastic, which is something we always had to watch out for,” Langguth says. “The EPDM diaphragms are working well so far.”

The E40 pump advantage is apparent when you enter the filling room – you can comfortably carry on a conversation.

“Everyone is happy with the quieter pumps. The noise is 300 percent less,” says Langgueth. “There’s about seven pumps running at one time and just one of the previous pumps made more noise than the seven Almatecs all running at once.”

Harald Vogl is a Regional Sales Manager – Germany for Almatec® and PSG®. Mr. Vogl can be reached at

Almatec is a leading brand of air-operated double-diaphragm (AODD) pumps from PSG®, a Dover Company. Headquartered in Oakbrook Terrace, Illinois, USA, PSG is comprised of several of the world’s leading pump brands.


Prior to its current installation a number of plastic AODD pumps failed in the continuous-duty container-filling operations.


A technician doses the ingredients into a mixing vessel until the end-product is bottled and sent down the packaging line.


AODD Pumps are a solution for Langguth Chemie because they meet the demands of stop/start continuous-duty pumping applications while consuming less air and generating less noise.