Bild Shape 3


Reliability at large nominal widths

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

Service-friendly construction

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

Temperature range
–20 °C / –4 °F up to 150 °C / 302 °F

Pressure Class
PN 2.5/6/10/16/25/40/64
ANSI 150/300

Construction lengths in accordance with
ISO 5752 BS 13 (F16)
ISO 5752 BS 14 (F4)
API 609
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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