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We are innovators and facilitators – always have been, always will be

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We are a family-owned company. That shapes our traditions and the way we think and act. We have been setting standards in the valve industry for over 60 years. Because we understand what moves people and satisfying their needs is our priority; working together to learn new things, find new solutions, and achieve unique results that inspire. Now and in the future.

Whether they come in the form of knife gate valves, butterfly and check valves or water control gates, isolation valves are our expertise. We combine engineering skills with exceptional manufacturing know-how. Our definition of performance: the highest level of quality, which stands the test of time.

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 Take a look behind the scenes

From the initial idea through to the installation.

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New at Sistag

Christmas Party 2025

Christmas Party

Mulled wine, twinkling lights, and authentic Christmas market vibes. Our Christmas party was simply magical and the perfect end to a great year. Here's to many more moments together in the New Year!

Pumps & Valves 2025

Pumps & Valves 2025

What a week! We had the best time at Pumps & Valves in Zurich. Among old and new acquaintances, good conversations, new discoveries, and raclette enthusiasts, we were able to present an absolute Wey innovation.

Apprentice trip 2025

Apprentice trip

Our apprentices' annual trip is a long-standing tradition. This year, the organizing team planned a guided tour of GIPO AG and a group visit to the Swiss Museum of Transport in Lucerne. A day full of exciting experiences and team fun for our 12 apprentices and their trainers.

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