The GZA is a combined shut-off and check valve featuring a closure weight and hydraulic controls.
The closure system works reliably, even in the event of a complete power failure.
Due to the large possible nominal widths up to DN 4.000, the GZA is often used in cooling water systems for power plants and for penstocks. Its range of applications includes pipe-rupture safety as well as pump and turbine protection. The GZA is manufactured either with massive disc or a bi-plane valve disc design.
Low pressure-loss coefficients
Hydrodynamically designed valve disc
Operation via an externally positioned closure
weight and hydraulic service drive
Custom-made models with a wide range of options
DN 500 / 20 inches up to DN 4000 / 160 inches
–20 °C / –4 °F up to 150 °C / 302 °F
Construction lengths in accordance with
ISO 5752 BS 13 (F16)
ISO 5752 BS 14 (F4)
Custom-made construction lengths on request
Valves designed in accordance with international standards, e. g.
AD technical instructions, ANSI, API, ASME, ATEX, BS, DGRL, DIN EN / ISO, GOST, KTA, MSS, RCC-M
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