Delta Pumps: The Vision, The Story, and The Success
Biography of Delta Pumps, authored by Ir. Dirk Zijlstra, son of the founder Gerrit Zijlstra.
January 2025
The Vision of Gerrit Zijlstra: Innovation and Progress
Delta Pumps emerged from the unique vision of its founder during the post-war chaos. Gerrit Zijlstra, born in 1917 in Sneek, had a forward-thinking idea for the pumps industry. As Europe focused on reconstruction in the years following World War II, Zijlstra realized that the traditional approach of creating custom solutions no longer sufficed. He conceived a radical alternative: standardized pumps that could be delivered quickly and at low costs. Zijlstra believed in the power of standardized products and proposed a catalog approach, where engineering was applied beforehand rather than per individual order. This innovation enabled Delta Pumps to achieve series production, resulting in shorter delivery times and reduced costs. His groundbreaking idea not only supported reconstruction efforts but also laid the foundation for the company’s future success.
However, the path to establishing Delta Pumps was far from easy. After graduating in mechanical engineering from the HTS in Leeuwarden, Zijlstra began his career at Stork Pumps in Hengelo. There, he collaborated with the Delft University of Technology to develop an innovative algorithm that standardized pump designs. Yet within Stork’s traditional structure, his ideas found little support. The lack of appreciation for his progressive approach ultimately led him to establish his own company.
In 1946, Zijlstra founded Delta Pumps during the challenging post-war period. Materials, tools, and machinery were scarce, and funds from the Marshall Plan and the Dutch Investment Bank (NIB) were crucial in securing the startup capital. The factory was set up in an old building in Hengelo, initially far from suitable. The floors were covered in potato sludge, electricity was unavailable, and tools were hard to come by. Despite these obstacles, Zijlstra succeeded in starting production with a small team of seven employees. Establishing an in-house foundry was pivotal, enabling the production of key components such as impellers and pump housings. This gave Delta Pumps a competitive edge by ensuring the robustness and efficiency of its products.
Remarkable Growth Despite Harsh Conditions
The high demand for industrial standardized pumps led to rapid growth. The post-war period was marked by severe shortages, with no government subsidies or support programs for startups. Despite these dire circumstances, Delta Pumps achieved extraordinary growth, even by today’s standards in the manufacturing industry:
- 1947: Within a year of its founding, more than 1,000 pumps were produced, and the workforce grew to 50 employees.
- 1949: Production of the 5,000th pump.
- 1953: Delivery of the 10,000th pump to the Assen Water Supply Company.
- 1960: Production of the 20,000th pump.
From its early years, Delta Pumps became a pioneer in the pump sector, characterized by robust designs for extreme conditions, including desert regions, and energy-efficient pumps. In addition to standardized products, the company also offered custom solutions for specific projects, distinguishing itself from competitors. The high quality and reliability of Delta Pumps’ products were soon recognized both nationally and internationally.
Beating Competition Through Innovation
In the domestic market, Delta Pumps faced threats from a cartel of four Dutch pump suppliers. Together with a co-shareholder, Zijlstra decided to outpace these competitors technologically by developing corrosion-resistant pumps for specific applications. This innovation granted Delta Pumps a monopoly in this niche market, enabling it to overcome the competition.
The 1950s and 1960s also marked a period of accelerated growth. Delta Pumps not only expanded its production capacity but also strengthened its international network by appointing agents in various countries, including France and the Middle East. In desert regions, Delta Pumps proved particularly effective in challenging conditions, including extreme heat and periodic sandstorms. For major drinking water projects in Egypt, Saudi Arabia, Iraq, and Iran, Delta Pumps outperformed 26 international competitors.
Zijlstra’s collaborative approach, both internally with his employees and externally with international partners, was essential to the company’s global expansion.
Leadership Rooted in Ethics and Resilience
Zijlstra’s leadership extended beyond technical innovations; he prioritized the human side of the business. During economic crises, such as the Korean War, when global demand for pumps plummeted, Zijlstra ensured no forced layoffs occurred. He negotiated with the company’s bank to guarantee employee salaries during the crisis, even halting his own salary for six months. His ethical entrepreneurship and care for his employees created a culture of commitment and made the company stronger.
Broader Contributions and Legacy
Zijlstra also played an active role in broader societal domains:
- Co-founder and Chairman of the Twente Metal Companies Association (VMT), now the VMO.
- 1956-1982 (retirement) : Member of the national board of CWM, serving as secretary. From 1957 onwards, he combined this role with the chairmanship of the regional CWM-Twente branch.
- Represented Dutch interests in Europump, influencing international standards and promoting Delta Pumps’ technological concepts globally.
By the 1960s, Delta Pumps faced growing competition and the need to scale up. Zijlstra introduced modern management systems, but limited company size remained a challenge. Eventually, Delta Pumps was acquired by Swiss company Sulzer in 1971. Zijlstra insisted on no forced layoffs as a condition of the acquisition, which Sulzer honored.
After retiring in 1982, Zijlstra remained involved in societal projects, including co-founding the Foundation for Metal-Electro Education Twente (SMEOT), providing vocational training in metalworking.
Rodelta’s Vision: Continuing the Legacy
Although Delta Pumps, after being sold to Sulzer, was later handed to VDA Pumps—unable to sustain its reputation—the industrial legacy persisted. Rodelta Pumps International, acquired in 2015 as a subsidiary of India’s Kirloskar Pumps, is now the rightful heir of the original Delta Pumps. The company retains the intellectual property of its early designs and continues to supply pumps and parts dating back to Delta Pumps’ founding days.
The story of Gerrit Zijlstra, his company, and his vision lives on in the values that made Delta Pumps great: innovation, collaboration, ethical leadership, and societal commitment.
